hybridfree/eevblog-posts huggingface dataset:
Do You use Macroblock IC's (LED light circuits) - are they relible or not? - Page 1
Forum section: electronics / beginners

author: PP7BB
author_rank: Contributor
timestamp: September 16, 2019, 06:53:06 pm
content: I am preparing to do my first lighting design. Powered from low voltage source - 24V DC. I found Macroblock MBI6651GSD IC's wich is almost a dreamed solution - step down DC DC converter with dimming integrated. I ve heard Macroblock were/are popular in flashlights and are good relible choice for those who don't want/can't design switching coverter by themselves (me ;-) ).Anyone used this IC or another from broad portfolio of Macroblock driver's?I just cant belive that this cheap IC do the job - i feel that something must be wrong with this - bad thermal design or so... For example, Wurth 172946001 driver or MeanWell LDD-350HS are priced about 10 times ... Wurth and MeanWell are advised over net, I wonder why Macroblock is so cheap compared to those?Have You heard about Macroblocks can You recommend them or dont?

author: janoc
author_rank: Super Contributor
timestamp: September 16, 2019, 07:04:55 pm
content: No experience with neither of these but the Wurth and MeanWell parts are modules, not ICs. I.e. they do quite a bit more than a bare chip (you get all the passives, inductors, mains filter, etc.), just connect power, load and you are good to go. The Macroblock part is a just the IC and you need to add the rest yourself in order to get a complete solution.So it is not apples to apples comparison, IMO.
Documentation/literature for learning analog oscilloscope controls - Page 1
Forum section: electronics / beginners

author: TimNJ
author_rank: Super Contributor
timestamp: July 29, 2014, 01:04:05 am
content: Hi everyone,I have a Tek 465M and I use it often, but I must admit that I really don't know more than 25% of the controls on the front panel and I would like to learn more about them since they obviously must be useful.I have read over the XYZs of Oscilloscopes one or two times and it is a good primer, but I'm looking for a guide that would help me learn all the controls in depth and strictly for analog scopes since modern literature seems to focus much on digital scopes.Any recommendations? I've been reading over the 465M manual and it's not bad, but perhaps something else?

author: w2aew
author_rank: Super Contributor
timestamp: July 29, 2014, 01:06:44 am
content: Quote from: TimNJ on July 29, 2014, 01:04:05 amHave you watched my Basics of Oscilloscopes class videos? Or, viewed my various analog scope videos (such as vertical controls, trigger controls, etc., etc.). Many of my analog scope videos use the 465B as the example scope.

author: TimNJ
author_rank: Super Contributor
timestamp: July 29, 2014, 01:07:13 am
content: Of course a few seconds after posting I find this:http://njarc.org/books/XYZs%20of%20Using%20a%20Scope/XYZs_of_Using_a_Scope.pdfAn older version of the Tek primer. I'll have to give it a read...any other recommendations are still welcome of course!

author: TimNJ
author_rank: Super Contributor
timestamp: July 29, 2014, 01:09:01 am
content: Quote from: w2aew on July 29, 2014, 01:06:44 amAlan I should have thought immediately to you. You seem to be a master on just about any scope. I will definitely (re?)watch them. Thank you.

author: w2aew
author_rank: Super Contributor
timestamp: July 29, 2014, 01:09:14 am
content: Quote from: TimNJ on July 29, 2014, 01:07:13 amI taught the class at the NJARC, which was based on that older version of the appnote. The video of that class is in the "sticky" thread here:https://www.eevblog.com/forum/beginners/oscilloscope-training-class-(long)/

author: TimNJ
author_rank: Super Contributor
timestamp: July 29, 2014, 01:50:04 am
content: Quote from: w2aew on July 29, 2014, 01:09:14 amWow I just look like an idiot. This was stickied on this very forum. I should open my eyes once in a while.Thanks that looks great
Does a buck converter output a higher current than the input? - Page 1
Forum section: electronics / beginners

author: polishdude20
author_rank: Contributor
timestamp: July 05, 2014, 11:22:28 pm
content: Title says it all. If I have lets say, 24 volts input at 1 amp and I want an output at 12 volts with a buck converter will I get 2 amps capability at the output (disregarding efficiencies) ?

author: Rick Law
author_rank: Super Contributor
timestamp: July 05, 2014, 11:32:32 pm
content: Quote from: polishdude20 on July 05, 2014, 11:22:28 pmYeah, it should (as you say, disregarding efficiency). So you get the same power at different voltage. That is what makes it more desirable than just regulator which burns it off as heat.Rick

author: IanB
author_rank: Super Contributor
timestamp: July 05, 2014, 11:38:03 pm
content: You have a basic equation from physics, which is always true, under all circumstances:(power in) = (power out) + (power losses)With an electrical system it is possible, with good design, to reduce the power losses arbitrarily close to zero. So if power in is 24 W, then power out can be made close to 24 W also.

author: mariush
author_rank: Super Contributor
timestamp: July 06, 2014, 12:34:29 am
content: Quote from: polishdude20 on July 05, 2014, 11:22:28 pmWell, you won't get 12v @ 2A from 24v @ 1A because there's no such thing as 100% efficient buck regulator. 90%+ is possible, so maybe 1.8A+ would be possible.

author: johansen
author_rank: Super Contributor
timestamp: July 06, 2014, 01:14:44 am
content: Quote from: polishdude20 on July 05, 2014, 11:22:28 pmyes, but the current will be pulled from the 24 volt input at 50% duty cycle in 2 amp pulses.

author: polishdude20
author_rank: Contributor
timestamp: July 06, 2014, 01:26:11 am
content: Quote from: johansen on July 06, 2014, 01:14:44 amIs this a bad thing if I'm powering something like an old camcorder? The pulses should be fine due to filtering capacitors in a buck converter right?

author: edy
author_rank: Super Contributor
timestamp: July 06, 2014, 01:49:08 am
content: It should be fine... If you have a scope you can even see the ripple on the output. The switching should be so fast it gets smoothed out by caps.I think there is more of an issue with 12 V DC to 120 V AC power inverters people use for camping or power failures with their cars. Some devices, especially AC motors, rely on that sine wave profile of the AC voltage... and most cheap inverters simply output a square wave. that would power a light bulb but can screw up some AC power supplies and motors may not even start turning.

author: Rick Law
author_rank: Super Contributor
timestamp: July 06, 2014, 03:12:06 am
content: Quote from: mariush on July 06, 2014, 12:34:29 amWell, for the ease of understanding, we all assume ideal circumstances at times. Without an "ideal op amp", op amps will surely be harder to learn...
Does a circuit with 240V and lots of computer equipment cause noisy power? - Page 1
Forum section: electronics / beginners

author: sofakng
author_rank: Regular Contributor
timestamp: August 05, 2020, 01:45:01 pm
content: I have a server rack in my basement with lots of computer equipment (servers, home theater equipment, etc). The server rack has a single 240V power strip that all equipment plugs into.I'm also using an HDMI matrix switch on this same 240V power strip and it's always having issues and the manufacturer is unable to figure out the problem.Is it possible that because I'm using a shared 240V power strip with lots of computer equipment that it's causing an extreme amount of noise/ripple for my HDMI device? If so, what is the best way to solve this?

author: madires
author_rank: Super Contributor
timestamp: August 05, 2020, 02:06:16 pm
content: The SMPSUs create some EMI and the earth/PE wire will be noisy too. But that shouldn't really impact any device (besides AM/SW receivers) unless some SMPSU or the impacted device are poorly designed (not CE compliant). You could try to power the HDMI matrix switch via an extension cord connected to another socket to check if the shared power strip causes the issues.

author: rstofer
author_rank: Super Contributor
timestamp: August 05, 2020, 02:21:50 pm
content: 240V power strips seem a little unusual for the US.

author: sofakng
author_rank: Regular Contributor
timestamp: August 05, 2020, 02:31:22 pm
content: Quote from: rstofer on August 05, 2020, 02:21:50 pmIt's a server rack so it has a dedicated 240V circuit that powers all of the equipment. The rest of the house is 110V of course.
Does a component that requires bakeout before reflow require it for hand solder? - Page 1
Forum section: electronics / beginners

author: JoeN
author_rank: Frequent Contributor
timestamp: December 19, 2017, 03:06:05 am
content: Component is LQFP-48, MSL-3. Soldering is hand soldering, not hot air, oven, or skillet. Generally, do you need to bake it out for hand soldering too?Thanks!

author: RobertHolcombe
author_rank: Frequent Contributor
timestamp: December 19, 2017, 03:47:03 am
content: No. Components with designated MSL only require baking when being reflowed - hand soldering is exempt because the dwell time is short and heat only applied directly to the component leads.

author: JoeN
author_rank: Frequent Contributor
timestamp: December 19, 2017, 06:30:39 am
content: Quote from: RobertHolcombe on December 19, 2017, 03:47:03 amThanks, that was what I was thinking. From time to time I get a few parts from Digikey and they come sealed, moisture indicator, desiccant bag, the whole nine yards. I prefer to remove the IC from this setup because it is too bulky to store in my IC trays and usually I need to get at the first IC for my project (any part less than about ten bucks I will always get at least an extra one, just in case or for future projects). I was wondering if this was wise, but I figured if it wasn't leadless then it is something I am going to hand-solder anyway.
Does a fast switching relay like component exist? - Page 1
Forum section: electronics / beginners

author: 9291Sam
author_rank: Contributor
timestamp: August 07, 2018, 12:36:59 am
content: To elaborate on the title I am thinking a 4 pin component that takes a input voltage on two of the pins and has a connection between two other pins.

author: Brumby
author_rank: Unknown
timestamp: August 07, 2018, 12:47:54 am
content: Try looking up "Solid state relay".There is quite a variety.

author: BrianHG
author_rank: Super Contributor
timestamp: August 07, 2018, 01:33:20 am
content: Any of these should do:https://www.digikey.com/products/en/relays/solid-state-relays

author: JS
author_rank: Frequent Contributor
timestamp: August 07, 2018, 01:34:01 am
content: Depending on the circuit, current level on the switch, AC or DC you could use just an opto coupler or one driving a triac, or one driving a mosfet but for this last one you need an extra power source of about 10V or something like that.JS

author: BrianHG
author_rank: Super Contributor
timestamp: August 07, 2018, 01:39:46 am
content: Quote from: JS on August 07, 2018, 01:34:01 amThere exist voltage out optocouplers designed for driving the gate of a mosfet without an external supply. In fact, using a dual unit with 2 back to back mosfets, you will create your own AC switch. Note that switch off speed is fast, but, nowhere near as fast as a mosfet driver as these special optocoupler's photovoltaic's discharge slowly. The choice of pulldown resistor speeds this up, but, loads the output voltage as the photovoltaic optocoupler's output current is low.In fact, this is how the DC/AC solid state relay ICs (the ones with 2 back-2-back internal mosfets like my digikey post above) actually internally work.

author: james_s
author_rank: Super Contributor
timestamp: August 07, 2018, 03:36:17 am
content: There are analog switch ICs, I don't see any mention of the type of signal being switched though. That makes a big difference.

author: JS
author_rank: Frequent Contributor
timestamp: August 07, 2018, 03:02:23 pm
content: Quote from: BrianHG on August 07, 2018, 01:39:46 amI guess a second optocoupler could be useful to turn off the mosfets loading the gate drivers and discharging them faster.Hard tp give a final answer if we don't know what the OP is switching, if a 100kW AC generator or a 3.3V logic signal...JS
Does a half bridge driver like a 2153 works for a SMPS like a MIP411 or STR-W675 - Page 1
Forum section: electronics / beginners

author: brenes.rob
author_rank: Newbie
timestamp: November 23, 2019, 05:06:55 pm
content: Hello!!I'm trying to design a SMPS and i want to simulate it in Proteus v8.5 (i dont have time to get a different simulator), and a could not find a primary switching Ic like the MIP411 or STR-W675, the only thing i can get is a half bridge driver, so i want to know if it is the same thing or how to connect a half bridge driver to control a SMPSThnaks! and greettings from costa Rica
Does a PCB NFC antenna need an impedance-controlled board? - Page 1
Forum section: electronics / beginners

author: HwAoRrDk
author_rank: Super Contributor
timestamp: April 19, 2021, 04:06:03 pm
content: As per subject, if one has an NFC antenna on a PCB, does the board need to be of impedance-controlled construction? We're talking typical 2-layer boards, nothing fancy.Initially, I would have guessed "no", because as far as I understand, your typical NFC antenna design always has no ground plane underneath (or around) it, so how can the substrate characteristics matter?However, I've been looking at a reference design for an NFC controller, and the design files for the PCB layout do specify a particular PCB material and stack-up (Isola FR-370HR, each layer 1.5oz plated, core 0.058" 0.5oz), as well as an impedance for the antenna traces ("50 ohms +/- 10% ... referenced to layer 1 ground"). I'm wondering whether this is to do with the fact that the antenna design they've implemented on this reference design is not single-sided, but rather has traces across both sides. It's approx. 3.5 turns total, with the first 2 turns on the top side, and the remainder on the bottom. For an antenna of this configuration, is a controlled-impedance stack-up of significance because of turns overlapping each other, or is it just the chip vendor being overly-specific with their manufacturing instructions?

author: twospoons
author_rank: Frequent Contributor
timestamp: April 19, 2021, 09:45:20 pm
content: I wouldn't bother with controlled impedance. An NFC antenna has a pretty low Q (>30), and will be somewhat detuned by the presence of the second antenna anyway (Near field ...).The slight variations in tuning that will occur with dielectric variation are going to be lost amongst that.
Does a relay add noise or interference to its inputs?  - Page 1
Forum section: electronics / beginners

author: little_carlos
author_rank: Regular Contributor
timestamp: September 14, 2015, 12:40:45 pm
content: Hi, i was wondering about that yesterday and i hope you can answer thissince the relay inputs are activated with an electromagnetic field, does that magnetic field causes any noise or interference to any signal that goes through ?

author: technix
author_rank: Super Contributor
timestamp: September 14, 2015, 12:46:07 pm
content: There can be some spikes if you are using stable DC to drive the solenoid but like a transformer with a thousand-turn primary and a one-turn secondary the noise is minimal.However the real concern here is contact bounce which can be significant if you bought one with unsatisfying quality.

author: retrolefty
author_rank: Super Contributor
timestamp: September 14, 2015, 07:44:48 pm
content: If you are asking if there is any coupling of 'noise' from coil/magnetic field to the output contacts, then no, there is no realistic concern there.

author: tggzzz
author_rank: Super Contributor
timestamp: September 14, 2015, 08:31:58 pm
content: Quote from: little_carlos on September 14, 2015, 12:40:45 pmYes, repeat no.In other words it depends on the type of relay, the operational environment, and the signal.

author: albert22
author_rank: Regular Contributor
timestamp: September 14, 2015, 11:36:11 pm
content: In this very sensitive application, some precautions in the relay were taken to prevent noise :http://electronicdesign.com/test-amp-measurement/whats-all-femtoampere-stuff-anyhow- shielding between coil and contacts- reduced voltage range on the coil.
Does an disabled crystal hooked to a micro still wiggle? - Page 1
Forum section: electronics / beginners

author: jnz
author_rank: Frequent Contributor
timestamp: February 05, 2019, 12:19:37 am
content: I have an Infineon XMC1200 micro I'm trying to put into low power mode. I follow the reference manual for steps, I think I hit all the right registers, I get to sleep and I'm not at 250uA, but 1000uA.I noticed the XTAL1/2 pins are still sin waving. I'm pretty sure they shouldn't be.... right? IIRC the XTAL is only part of an the whole oscillator circuit and there is a special driver in the micro itself, I assume this is where my power drain is coming from.Thoughts?

author: Doctorandus_P
author_rank: Super Contributor
timestamp: February 05, 2019, 08:19:58 am
content: Microcontrollers have mutiple ways to save power.In the lowest power (highes power save?) setting the crystal oscillator is usually stopped, and the uC can only be awakend by external events such as interrupts.So if you uC crystal is still oscillating at it's nominal frequency then you have very likely not configured your uC for the lowest power consumption.

author: mvs
author_rank: Frequent Contributor
timestamp: February 05, 2019, 09:58:17 am
content: Quote from: jnz on February 05, 2019, 12:19:37 am250µA is lowest consumption in deep-sleep with all kinds of efficiency hacks applied, like code execution from RAM only (flash disabled), all peripherals disabled, Pin Power Save feature enabled, etc.QuoteDCO1 should be disabled in deep-sleep, but not in normal sleep.PS How long lasts sleep phase in your application? Do you use some peripherals?

author: jnz
author_rank: Frequent Contributor
timestamp: February 05, 2019, 04:14:58 pm
content: Quote from: mvs on February 05, 2019, 09:58:17 amYea, I'm looking for explicit DCO1 disable right now. Infineon support is really the worst, we found some "deep sleep" code on their forum, but it leaves the external on.The deep sleep phase here is permanent. Once the device is done working, it shuts the whole thing down. The low power is so I don't run the battery dead.EDIT: DCO1 is the internal. I want to disable both. Interestingly I just saw an issue where we did *SOMETHING* to the clocks that entirely broke the chip. Seems to crash the debugger entirely.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: February 05, 2019, 06:12:27 pm
content: 250uA is also not real low power nowaday's.some uC's go down to 100nA while still running @ 1MHz.

author: jnz
author_rank: Frequent Contributor
timestamp: February 05, 2019, 06:35:25 pm
content: Quote from: Doctorandus_P on February 05, 2019, 06:12:27 pmThanks, I'll keep that in mind when I re-design Infineon's line up.

author: jnz
author_rank: Frequent Contributor
timestamp: February 06, 2019, 06:06:32 pm
content: Turns out there were a few issues.The SCU_Analog register didn't read correctly.You need to put the PASSWD register in before the clock will disable.There is definitely something you can do to 100% brick these chips. I have no idea what we did, but broke 4 before rolling code way back. This will remain a mystery.
Does an LC Local Oscillator for an FM Receiver Need Temperature Compensation? - Page 1
Forum section: electronics / beginners

author: explosifiy
author_rank: Newbie
timestamp: September 08, 2023, 06:50:57 pm
content: Hello, I am planning on making a superheterodyne FM Receiver. I was planning on making an LC VFO for the local oscillator, using a varicap to change the frequency. I know that varicaps can vary with temperature, but would it need to be temperature compensated or would the deviations be small enough to be negated by the PLL that I will use to demodulate the signal?

author: CaptDon
author_rank: Super Contributor
timestamp: September 09, 2023, 12:38:50 am
content: Almost all of the old L/C oscillator FM tuners had A.F.C. control built in due to drift. Some had the FM / FMAFC mode where you could turn off the AFC due to 'pulling' by local strong stations which could pull the tuning away from a desired weaker station. In this age of digital frequency selection the AFC is sort of a built-in habit of the PLL and yes, they will sometimes pull to a stronger local station instead of the desired weaker station. The old L/C tuners were naturally built to resist drift as much as possible with usually N.T.C. capacitors in the circuit. You could often see markings like 47pf 750ntc on the caps surrounding the oscillator circuit. The caps always seemed to be negative temp compensated, perhaps the fixed coils tended to drift positive with temperature?

author: David Hess
author_rank: Super Contributor
timestamp: September 09, 2023, 07:07:31 pm
content: No temperature compensation is required if the LC oscillator is part of a phase locked loop for a local oscillator.

author: TimFox
author_rank: Super Contributor
timestamp: September 09, 2023, 07:58:18 pm
content: The old AFC circuits used in traditional FM receivers used the DC component of the discriminator detector as an error voltage for the AFC, moving the problem to the stability of the Foster-Seely discriminator circuit.This is technically a "frequency-locked loop".Newer receivers use a PLL either to lock the LO itself to a clock frequency (avoiding pulling of the LO), or by servoing the LO from a PLL used for FM demodulation.
Does anyone recognize these two SOT23 SMD parts? - Page 1
Forum section: electronics / beginners

author: RoadRunner
author_rank: Frequent Contributor
timestamp: March 24, 2020, 08:46:41 pm
content: I am having these two SOT23 devices with marking Show as show in image. They both are marked with Q8 and Q12 on PCB. I have tried searching on web but no luck.Does any one recognize them or may be help me finding out what they are.Regards

author: magic
author_rank: Super Contributor
timestamp: March 24, 2020, 10:37:22 pm
content: Could be these. Some sort of RF device?https://www.onsemi.com/pub/Collateral/MMBTH10LT1-D.PDFhttps://www.nxp.com/docs/en/data-sheet/PMBFJ308_309_310.pdfGenerally, I just search for something like "sot23 xxx transistor" or whatever I suspect the part might be and some links come up.

author: stefanh
author_rank: Contributor
timestamp: March 24, 2020, 10:46:14 pm
content: I usually usehttp://www.s-manuals.com/smdFirst one might be MMBTH10. Not sure on the second.

author: RoadRunner
author_rank: Frequent Contributor
timestamp: March 25, 2020, 07:34:50 am
content: Thanks for info.Circuit is not exactly RF but ranging upto 150Mhz. So there is very high chances that these are some RF transistor.I did try to search all possible keywords that i may think of but no luck.

author: chrisl
author_rank: Regular Contributor
timestamp: March 25, 2020, 10:46:11 pm
content: Looks like commonly used parts in analog front-end for oscilloscopes.

author: amyk
author_rank: Super Contributor
timestamp: March 26, 2020, 03:21:54 am
content: Both of those can be found in this thread, the above posters are correct:https://www.eevblog.com/forum/repair/sdg1025-overvoltage-and-relay-malfunction-repair/

author: RoadRunner
author_rank: Frequent Contributor
timestamp: March 26, 2020, 08:05:21 am
content: Thank you all for responce.Somehow at the same time i was also able to find the exact part using google image reverse search , it landed to me to ebay listing where product photo is visible.Regards
Does anybody have experience with Zigbee (especially application profiles) - Page 1
Forum section: electronics / beginners

author: Spikee
author_rank: Frequent Contributor
timestamp: May 22, 2016, 08:46:06 pm
content: So... i'm a bit confused about all this zigbee application profile stuff.Is this assumption correct?:All the Zigbee profiles are just pre-agreed upon standard messages (for example smart energy) going over "normal" zigbee (pro) protocol.And any Zigbee (pro) device can receive and "see" those messages as long as it has the password/correct pan ID/ channel/ encryption key ?A module I found was pre-approved platform for smart energy but the AT commands didn't seem "special". And just had unicast,broadcast and various rf parameters.So I assume when you write firmware to use such module you have the "construct" the packet yourself following the smart energy Vx.x specifications.Anybody here that has experience with these profiles ?Thanks

author: ataradov
author_rank: Super Contributor
timestamp: May 23, 2016, 05:49:48 am
content: Quote from: Spikee on May 22, 2016, 08:46:06 pmPretty much. It is a bit more complicate that this in real life.Quote from: Spikee on May 22, 2016, 08:46:06 pmAnd as long as stack does not kill them because they are not registered top be handled by the application.Quote from: Spikee on May 22, 2016, 08:46:06 pmWhat mode is this? In order to handle standard profile messages, the stack must support ZigBee Cluster Library (ZCL).Quote from: Spikee on May 22, 2016, 08:46:06 pmIt is not easy to "construct" those frames. They are not simple messages, but rather complicated system of requests and responses. And core that handles all that stuff can be very complicated.Quote from: Spikee on May 22, 2016, 08:46:06 pmI do, but I doubt you need SE profile. If you are not a utility company, then forget about it, SE requires Certicom library to do eliptic curve key negotiation and you are not getting that.

author: Spikee
author_rank: Frequent Contributor
timestamp: May 23, 2016, 09:00:05 am
content: Thank you for the reply. This application needs the se profile so I'll just look for a module that comes with the stack I need.

author: ataradov
author_rank: Super Contributor
timestamp: May 23, 2016, 04:11:01 pm
content: Quote from: Spikee on May 23, 2016, 09:00:05 amI doubt you will find any. And even if you do, they still will not work with real SE networks, since provisioning has to happen on the utility company side first. And they obviously will not provision some unknown device.

author: coppice
author_rank: Super Contributor
timestamp: May 23, 2016, 05:20:59 pm
content: The more recent applications specs from Zigbee are completely independent of the radio protocol. They are application message definitions which are run over various forms of IP network as well as Zigbee.Watch out with the Smart Energy Profiles. Version 2 isn't an upgrade of version 1. There is little compatibility between them, and they are now being treated as two separate development paths.
Does anyone have a copy of Microcap 3 Student version (1992) - Page 1
Forum section: electronics / beginners

author: CraigAB
author_rank: Contributor
timestamp: December 23, 2023, 09:45:10 pm
content: Hi,I have a book that I bought in 1992 (ISBN: 0-201-95414-1 Student version of Micro-cap III) and the included 720k disk. Unfortunately, the only file that is corrupt on the floppy is mc3s.exe, the main file.Does anyone have a copy of the file?Micro-cap is now free, but the versions that are on the site are version 5 and greater. I have also looked at Archive.org.This version is the free version and does not require a serial or HASP.Kind regards,Craig

author: amyk
author_rank: Super Contributor
timestamp: December 24, 2023, 05:39:58 am
content: https://archive.org/details/Micro-CapIIIV2.0IBMPC3.5https://forum.winworldpc.com/discussion/15001/offer-micro-cap-iii-student-version-3-04-year-1990http://old-dos.ru/index.php?page=files&mode=files&do=show&id=6513Any of these help?

author: CraigAB
author_rank: Contributor
timestamp: December 24, 2023, 07:17:58 am
content: Quote from: amyk on December 24, 2023, 05:39:58 amYes! It does thank you!!That one on Archive.org is in raw format. (I should really learn how to use Kyloflux)Bugger, I missed that one on WinworldPC, I think I forgot to search the forums on there.But the good old russian sites. They never fail.My Google-Fu is weak these days.Thanks again.
Does anyone have the schematics for this USB barcode scanner? - Page 1
Forum section: electronics / beginners

author: Azhar
author_rank: Regular Contributor
timestamp: August 11, 2013, 02:33:06 am
content: I have a CCD Barcode Scanner type: FG-8100, and I'm wondering if anyone can help me find the schematics for it?Thanks

author: SeanB
author_rank: Super Contributor
timestamp: August 11, 2013, 05:52:07 am
content: It is a regular keyboard scanner inside, with a simple USB keyboard converter chip inside to make it appear as a keyboard when you plug it in. If you plug it in it appears as a second keyboard, and works as a number input device. To program it you need the program card from the manual that you scan and then it sets the scan mode, scan types accepted and character sets to use when outputting the numeric barcode data set.

author: Azhar
author_rank: Regular Contributor
timestamp: August 13, 2013, 01:17:46 am
content: Thank you SeanB!

author: SeanB
author_rank: Super Contributor
timestamp: August 13, 2013, 05:43:47 pm
content: I have 2 of them here by me, was thinking of sending one to the big pile on Dave's desk for a destructive teardown. One is a simple hand held keyboard wedge, the other is a proper handheld PC with a scan head running embedded DOS.

author: Azhar
author_rank: Regular Contributor
timestamp: August 15, 2013, 01:24:21 pm
content: I love the tear downs!

author: Spunky
author_rank: Regular Contributor
timestamp: August 15, 2013, 08:48:31 pm
content: These are a few pounds on ebay brand new. Ok for small items but useless in a warehouse, the laser ones are much more capable and can be cheap second hand. Symbol and Intermec are probably best.
Does anyone have the specs for International Rectifier 66-6058B? - Page 1
Forum section: electronics / beginners

author: MarkKn
author_rank: Contributor
timestamp: July 31, 2022, 09:44:45 pm
content: I have an older and very large rectifier, and I am not able to locate the specifications for it, despite a good amount of internet searching. I even located a couple of old International Rectifier catalogues on the interweb, but they did not have this model. I believe the U10 on the diode references the packaging or form factor. Including a couple of photos. The second digit in the part number is missing some ink and I have looked at it closely and believe it is a 6 and not a zero. Partially this conclusion is based on some other 66 in product numbers in their old catalogues. So, if anyone happens to have an old International Rectifier catalog or some such, I would love to get the specs on it--basically max reverse voltage and forward current.

author: mag_therm
author_rank: Frequent Contributor
timestamp: August 02, 2022, 02:30:27 am
content: The number might have been an in house stock number of the equipment manufacturer. Probably a re-badged standard IR part.If you can determine the stud thread (is it 1/2 inch 20TPI or 3/4 inch 16 tpi, ?)Then measure the hex across flats. There were often more than one hex size for each stud thread.That will lead to the package D0 number D0-8 etcThen look at fuses in circuit and incoming AC voltage, Dc output V and I.As Infineon no longer do these, you can refer to eg Vishay datasheets maybe the VS-45 to VS-150 series or next larger.Or Semikron, Ixys etc.Even better try to get a old IR catalog. Didn't see one on search, maybe someone on eevblog has one.
Does anyone know how smart bulbs count power up cycles? - Page 1
Forum section: electronics / beginners

author: e100
author_rank: Frequent Contributor
timestamp: April 17, 2022, 09:09:50 am
content: (In order to initiate a factory reset.)A common theme of mains powered smart bulbs is that they have no reset switch to restore the default factory settings. Instead you have to cycle the power a particular number of times over a particular number of seconds. The timing of the sequence is designed to minimize the chance of an accidental factory reset due to a child 'playing' with the light switch.I've noticed that with some of my older bulbs that the required timing behavior to initiate a factory reset has changed since they were new. Does that indicate the use of analog circuitry? I find that odd as these things are cost optimized to the extreme.

author: NaxFM
author_rank: Regular Contributor
timestamp: April 17, 2022, 09:48:26 am
content: I always thought that they may use a capacitor to power up the microcontroller while powered off. In a super low consumption state a small capacitor is able to keep them running for several seconds. Then they just run a timer and detect when there is mains power. I higly doubt they have a coin cell inside.This may also explain why the timing in your old bulb is different: the capacitor may have started going bad. This is just my personal guess, i have yet to teardown one, but that timing problem you described makes me feel more confident

author: David Hess
author_rank: Super Contributor
timestamp: April 18, 2022, 02:42:53 am
content: A CMOS counter or a charge pump circuit which is sort of an analog counter could do it.

author: capt bullshot
author_rank: Super Contributor
timestamp: April 18, 2022, 09:51:25 am
content: Usually modern MCU stuff can detect power on resets and may or may not have non-volatile storage, and often have some kind of low power storage and RTC that is intended to be used with an external battery.While the power is on, the MCU easily can detect how long it is turned on - save a flag e.g. while you're turned on for a certain amount of time, and reset that flag if the timing condition isn't met (too short or too long turned on). On next power on, read that flag from non-volatile or a "few seconds alive from a capacitor" storage", and increment a counter, otherwise reset that counter. If the counter reaches a certain value, do the factory reset.I'd guess it's all implemented without any additional hardware. I'd guess too, it cannot detect the power off duration precisely (power on duration is easy in software), but something that just can discriminate between "longer than a few minutes" and "shorter than a few seconds" should be fine to do the job - might be an otherwise unused RTC within the microcontroller that is buffered by a small capacitor. So the criteria might be "RTC is still alive, or RTC has reset" to discriminate long or short "off".
Does anyone know how to open this connector? - Page 1
Forum section: electronics / beginners

author: TheGenesis
author_rank: Contributor
timestamp: April 03, 2021, 02:48:16 pm
content: Hi everyone,i have some trouble with the Cockpit-Display of my new chinese EV. It produces vertical stripes instead of a the fancy graphics.The picture now look like a defective T-Con-Board on a LED TV.I have already disassembled the unit but i cannot remove the flat flex cable because i never see a connector like this.Can someone tell the trick to unlock this thing or did i just need to pull the cable hard enough?Thx in advanceThom

author: Renate
author_rank: Super Contributor
timestamp: April 04, 2021, 12:45:01 pm
content: Dunno. Does the white part pull straight back (away from the flex)?

author: grumpydoc
author_rank: Super Contributor
timestamp: April 04, 2021, 12:52:50 pm
content: Does the metal part move away from the flex to unlock it?

author: Nusa
author_rank: Super Contributor
timestamp: April 04, 2021, 01:27:11 pm
content: Never seen that before, but my guess is that metal bar on the back gets pushed, pulled, or flipped to unlock.

author: MikeK
author_rank: Super Contributor
timestamp: April 04, 2021, 02:54:23 pm
content: Yeah, the metal part looks like it was pushed in onto the plastic part to lock everything. So it looks like the metal part gets pulled straight back (not up).

author: Vovk_Z
author_rank: Super Contributor
timestamp: April 04, 2021, 03:34:22 pm
content: It seems to me the metal part can be flipped. If it moves - it usually moves pretty easily, so it has to be easy to check it.

author: TheGenesis
author_rank: Contributor
timestamp: April 14, 2021, 06:33:44 pm
content: Thanks everyone for your suggestions!The metal bar has to be pushed towards the ribbon cable.It releases a locking mechanism wich locks the two outer indents at the end of the cable.You also have to push it when re-inserting the cable.This is a very solid connection. But the connector itself is weak, so you are at risk of tearing it apart when pulling the metal bar into the wrong direction.

author: MikeK
author_rank: Super Contributor
timestamp: April 14, 2021, 06:46:32 pm
content: I would not have guess that, given that it doesn't look like there is any room in that direction.
Does anyone know this manifacturer logo? - Page 1
Forum section: electronics / beginners

author: fabiodl
author_rank: Frequent Contributor
timestamp: August 21, 2020, 06:57:28 am
content: it is present on sega's mega CD

author: chris_leyson
author_rank: Super Contributor
timestamp: August 21, 2020, 08:00:41 am
content: Looks like Microchip

author: fabiodl
author_rank: Frequent Contributor
timestamp: August 21, 2020, 10:55:42 am
content: Indeed it seems microchip. Did they sell edge connectors in the 90s?

author: oPossum
author_rank: Super Contributor
timestamp: August 21, 2020, 01:53:38 pm
content: Possibly MillMax or Waldomhttps://www.mill-max.com/

author: wraper
author_rank: Unknown
timestamp: August 21, 2020, 02:01:12 pm
content: Quote from: chris_leyson on August 21, 2020, 08:00:41 amWhile it's somewhat similar, it's certainly not microchip. Angles lines are located at are not the same, line in the middle should be shorter. Not to say it should be within circle.

author: fabiodl
author_rank: Frequent Contributor
timestamp: August 21, 2020, 02:38:14 pm
content: mill-max would make a lot of sense for a connector, but the logo appears to be very different.the differences w/ microchip are indeed there, and as for microchip's market segment, it seems improbable

author: free_electron
author_rank: Super Contributor
timestamp: August 21, 2020, 03:24:54 pm
content: AssMann . yeah , that's a real company !

author: amyk
author_rank: Super Contributor
timestamp: August 21, 2020, 11:29:46 pm
content: Why are people suggesting US companies on a product whose origin is obviously Japanese?Mitsumi.

author: Brumby
author_rank: Unknown
timestamp: August 22, 2020, 01:27:54 am
content: amykFTW!

author: fabiodl
author_rank: Frequent Contributor
timestamp: August 22, 2020, 06:37:42 am
content: Quote from: amyk on August 21, 2020, 11:29:46 pmDefinitely this!
Does anyone know this mystery IC from the UK? - Page 1
Forum section: electronics / beginners

author: Traceless
author_rank: Frequent Contributor
timestamp: May 23, 2024, 12:44:44 pm
content: Hi everyone,as the title says here is some UK made mystery IC. I have no clue what it is for. Search yields onehitto a parts store called Jotrin with some generic gibberish product description. The datasheet link does not work. However the page points to BI Technologies as manufacturer. Searching for the top marks on thewww.bitechnologies.comalso yields no results.Does anyone know those ICs or a source where I can get a datasheet?Cheers Traceless.

author: daisizhou
author_rank: Super Contributor
timestamp: May 23, 2024, 12:52:56 pm
content: Looks like it's a 100 ohm network resistor.Similar to the connection belowhttps://item.taobao.com/item.htm?abbucket=18&id=709748518400&ns=1&priceTId=215041db17164686304604564e0a3f&spm=a21n57.1.item.11.4980523cQXfTwy

author: T3sl4co1l
author_rank: Super Contributor
timestamp: May 23, 2024, 12:56:42 pm
content: Possibly this,http://datasheet.iiic.cc/datasheets-1/bi_technologies/618.pdfdon't know what happened to the '61'.BI is a long standing resistor brand; like Dale, Bourns, etc., they've been bought up or have diversified into other components over the years, but from that era, you certainly have a resistor array there. It seems the 618 series is discontinued, and datasheets are scarce in my Google too, so you might have best luck just measuring the part, confirm that it matches the layout and ratings in the datasheet.Tim

author: Gyro
author_rank: Super Contributor
timestamp: May 23, 2024, 01:16:34 pm
content: Quote from: daisizhou on May 23, 2024, 12:52:56 pmYes, I'd say 8 individual 100R resistors across the package.

author: Traceless
author_rank: Frequent Contributor
timestamp: May 23, 2024, 03:10:47 pm
content: Thanks everyone,100R isolated resistor network matches what I can measure with my meters. Special thanks to T3sl4co1l for finding the datasheet. It's nice to have some specs like the max voltage ratings.Cheers Traceless
Does anyone know what this part is? (image inside) - Page 1
Forum section: electronics / beginners

author: antpgomes
author_rank: Newbie
timestamp: October 25, 2017, 01:46:27 pm
content: Hi allI was wondering if anyone knows what the following part is/can point me to a datasheet. It is attached to a piezo sounder driver so i'm assuming is a piezo but i haven't seen this in this form factor. It's 9x12mmThanks in advanceAntonio

author: james_s
author_rank: Super Contributor
timestamp: October 25, 2017, 06:28:43 pm
content: That looks like a piezo device of some sort. It may be for an ultrasonic cleaner or some similar device. Where did you get it from? Is there any recognizable brand or info on the board it is connected to?

author: antpgomes
author_rank: Newbie
timestamp: October 25, 2017, 06:51:02 pm
content: Ring Zerohttp://ringzero.logbar.jp/It is connected to a Part with the marking P8904 DDA4g - i believe this is a piezo sounder driver. The (piezo?) itself does not have any markings unfortunately
Does anyone know when my Tek oscilloscopes were built? - Page 1
Forum section: electronics / beginners

author: Redcat
author_rank: Regular Contributor
timestamp: December 22, 2013, 08:25:59 pm
content: Hi ,it would be nice to know, when exactly (month/year) my oscilloscopes were built:Tektronix 475 Option 4 - Nr. 707179(I'm not sure what Option 4 exactly is. Is it the black metal mesh filter on the display?)Tektronix 2215A -Nr. 203277Thank you very much and Merry Christmas, Tom

author: PA4TIM
author_rank: Super Contributor
timestamp: December 22, 2013, 09:14:46 pm
content: As far as I know the Tek serial numbers are not usable for this. The best thing is to look inside. On parts like IC's, caps and transformers you can often find a year. Some of my Teks have the year printed on the PCBslike on this very early 453 (1965)

author: grumpydoc
author_rank: Super Contributor
timestamp: December 22, 2013, 10:17:36 pm
content: QuoteOn the 2215 a look at the back might be all that is required - they often have a sticker with the year of manufacture.The 475 was in production from 1973 to 1984, the 2215A introduced in 1985 and out of production by 1996 at the latest which narrows it down a bit.

author: Redcat
author_rank: Regular Contributor
timestamp: December 23, 2013, 10:01:58 am
content: Thank you, this will help me narrow it down a little bit. No there is no date sticker on the backside. The only thing I found out so far is that they are from the Netherlands and from London (7.... , 2.... found this in the manuals).Did also know that the 475 is older than 1985 because it was not in the catalog I have from this year.But it's very interesting that the 2215a could be much newer than I thought.I will definitely look for prints on the PCB and bigger partswhen I'm back from christmas holidays.Nice greetings, Tom

author: Redcat
author_rank: Regular Contributor
timestamp: January 05, 2014, 05:28:42 pm
content: Had the Tek 475 open today again. It's from 1979 - as old as me. Found the code on some ics today. Some pcbs say 1978 and 1971 but I think it is because the design is older.So thanks again for the tips.
Does anyone know where I can find any info on this transistor?? - Page 1
Forum section: electronics / beginners

author: powerpcme
author_rank: Newbie
timestamp: January 14, 2018, 02:50:44 pm
content: I’ve been trying to find a data sheet for this everywhere. The closest thing I can find is a data sheet for a Sanyo 2SA1016 But the pin out has center pin as collector but other transistors have it different. I really don’t want to risk blowing something in my circuit if this is wrong.

author: Andy Watson
author_rank: Super Contributor
timestamp: January 14, 2018, 03:04:27 pm
content: It's a 2SA1016 - all the datasheets that I can find point back to the Sanyo part.Quote from: powerpcme on January 14, 2018, 02:50:44 pmWhat evidence do you have to suggest that the centre pin is not its collector? To be certain you're either going to need the schematic and/or reverse engineer the circuit around that transistor.

author: wraper
author_rank: Unknown
timestamp: January 14, 2018, 03:05:33 pm
content: 99% that it's 2SA1016, likely not Sanyo though.QuoteDunno what you mean by this, most transistors in TO-92 case have collector as center pin.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: January 14, 2018, 04:55:11 pm
content: Quote from: wraper on January 14, 2018, 03:05:33 pmJapanese ones, yes, European ones ( BC548 etc.) have base at centre

author: Ordinaryman1971
author_rank: Frequent Contributor
timestamp: January 14, 2018, 05:51:28 pm
content: Here is a datasheet for 2SA1016
Does anyone know where I can get an lm35z? - Page 1
Forum section: electronics / beginners

author: Toble_Miner
author_rank: Contributor
timestamp: October 07, 2013, 01:21:10 am
content: Digikeyis your friend.EDITHmmThose small things seem to be quite hard to get. You should probably try to find another component to do the job.

author: simpson
author_rank: Contributor
timestamp: October 07, 2013, 03:12:19 am
content: Search eBay for LM35

author: chibiace
author_rank: Regular Contributor
timestamp: October 08, 2013, 05:59:37 am
content: tayda has em.

author: sanjin
author_rank: Newbie
timestamp: October 08, 2013, 09:18:01 am
content: You can find them on Farrell as wellhttp://uk.farnell.com/texas-instruments/lm35dz/ic-precision-temp-sensor-to-92/dp/9488200

author: bhilly82
author_rank: Contributor
timestamp: October 09, 2013, 05:29:57 am
content: jameco has them as well, well they have the lm35dzhttps://www.jameco.com/webapp/wcs/stores/servlet/StoreCatalogDrillDownView?langId=-1&storeId=10001&catalogId=10001&freeText=lm35&search_type=all
Does anyone knows what is this ? - Page 1
Forum section: electronics / beginners

author: little_carlos
author_rank: Regular Contributor
timestamp: April 10, 2015, 12:47:06 am
content: a friend gave me this but i have no idea of what is, any of you know something about it? ive searched on internet but i didnt found any relevant infohere are some pics

author: oPossum
author_rank: Super Contributor
timestamp: April 10, 2015, 12:50:00 am
content: PLC programming panel.
does anyone recognize the makers mark on this componant - Page 1
Forum section: electronics / beginners

author: EvilGeniusSkis
author_rank: Regular Contributor
timestamp: July 23, 2015, 06:06:57 pm
content: I salvaged a bunch of componants in this package from some old boards and am trying it identify the componants but google is proving useless as there are characters that i can't put into the search box. I figure if i can figure out who the manufacturer is that will help allot. I would also like to know what that type of package is called, I'm assuming it's TO-something.

author: Andy Watson
author_rank: Super Contributor
timestamp: July 23, 2015, 06:15:23 pm
content: Matsushita.http://www.silicon-ark.co.uk/2sb641-r-silicon-pnp-transistor-by-matsushitaTry prefixing the part number with "2S" - Japanese transistors often omit this from their packaging.

author: CatalinaWOW
author_rank: Super Contributor
timestamp: July 23, 2015, 06:21:45 pm
content: Great resource for this kind of thing.http://how-to.wikia.com/wiki/Howto_identify_integrated_circuit_(chip)_manufacturers_by_their_logos
Does micro controller System clock selection affect ESD tests(61000-4-2)? - Page 1
Forum section: electronics / beginners

author: aju11
author_rank: Contributor
timestamp: August 02, 2018, 09:07:53 am
content: We designed an equipment with STM32L443 controller with 10MHz crystal.Initially we had kept the system clock = 10MHz.The equipment failed ESD test at direct and indirect contact even at 4kV. (61000-4-2)we really struggled on improving earth connections, cabling, adding TVS diodes, etc.. but consistently failed.We changed the system clock to 40MHz(10x4 by using chip-PLL).The equipment passed the ESD tests even at 8kV contact discharge. We repeated the test several times. It kept passing.Does selecting proper system clock frequency (enabling PLL) improve ESD compatibility of equipment?