hybridfree/eevblog-posts huggingface dataset:
W2AEW's video and Capxon cap - Page 1
Forum section: electronics / projects

author: atferrari
author_rank: Frequent Contributor
timestamp: February 19, 2015, 11:55:22 pm
content: This morning I spent one full hour using the knowledge acquired in this video:http://youtu.be/115erzCCxgEHope is correct now.I checked a big bunch of caps, and, when coming to those collected after disassembling uncountable boards, there was one branded Capxon, sporting the highest ESR in this session: almost 6 ohms.Sure I heard of than brand before...!Let's say that one third of my caps were discarded and I feel better. Thanks Alan.Back to current sources now.

author: miguelvp
author_rank: Super Contributor
timestamp: February 20, 2015, 04:00:57 am
content: For the future don't end a link with a period because it becomes part of the link and people can't click on it.Also if you use the full url with http, it will embed the video in the post.

author: atferrari
author_rank: Frequent Contributor
timestamp: February 20, 2015, 09:15:16 am
content: Quote from: miguelvp on February 20, 2015, 04:00:57 amHola miguel,Period is gone now. Gracias.I use the "Insert hyperlink" function and I get what you see below. ??http://youtu.be/115erzCCxgE

author: tautech
author_rank: Super Contributor
timestamp: February 20, 2015, 09:28:38 am
content: QuoteEasy mistake to make, you just captured a period(full stop) some how.You have it correct now.

author: GreyWoolfe
author_rank: Unknown
timestamp: February 20, 2015, 01:38:00 pm
content: If you look onwww.badcaps.comyou will find plenty about Capxon (Crapxon) capacitors. Dell did an ugly dance about 7-8 years ago with them appearing on motherboards, in our case-Optiplex GX270, and in 15" LCD monitors. My company had over 2,000 of the workstations and monitors deployed and Dell paid the company to replace every motherboard and extended the warranty free for an extra year. The monitors didn't start to fail until after the extended warranty was out, so we were fixing them in house. No one was amused over that one.

author: atferrari
author_rank: Frequent Contributor
timestamp: February 20, 2015, 03:45:30 pm
content: Quote from: GreyWoolfe on February 20, 2015, 01:38:00 pmYes, the Capxon brand on it, rang a bell.

author: w2aew
author_rank: Super Contributor
timestamp: February 20, 2015, 10:59:29 pm
content: Quote from: atferrari on February 20, 2015, 03:45:30 pmI'm glad to hear my video helped you out!
W5500 broken link - Page 1
Forum section: electronics / projects

author: S. Petrukhin
author_rank: Super Contributor
timestamp: April 25, 2024, 10:49:11 am
content: Hi, friends!Has anyone encountered the problem of the WIZnet W5500 chip hanging from interference in a power line?Line is completely isolated from the circuit galvanically ин optocoupler.Even if the power supply is simply applied to the power wire, the connection is broken from time to time.At the same time, SPI communication W5500 with the MCU is working, the Link indication is displayed both in the W5500 register and by LEDs.But even ping, which is autonomous inside the W5500, does not work.PE connected. I checked different Ethernet switches.Complete circuit section diagram:

author: S. Petrukhin
author_rank: Super Contributor
timestamp: April 25, 2024, 12:44:13 pm
content: Added information.W5500 resets the status, loses the PHY and IP settings.There may be an incorrect reset scheme, I'm checking it...
W5500 Ethernet controller - DHCP Lease Time - Page 1
Forum section: electronics / projects

author: honeybadger
author_rank: Contributor
timestamp: December 05, 2019, 11:47:22 am
content: Hi,I am building a simple Ethernet sensor with Arduino and W5500 module.A few temperature sensors... HTTP POST... simple.The thing is it has to be as reliable as possible. Because you would need a ladder to restart it.The Arduino has its own watchdog but I am not sure how to handle the Ethernet part.My concerns are:-What happens when the DHCP lease time of the IP address expires?Will the W5500 handle asking for the new IP address by itself or I have to somehow force it?- What happens when both Arduino and W5500 are running, the router is running, IP is assigned - then theEthernet cable is disconnected and after some time is connected again. Neither the Arduino neither the router was rebooted. Will be new IP assigned automatically and everything will continue like nothing happened? I am asking because "Ethernet.begin(mac);" is called only once at the startup.I will test it all when the module arrives but I want to make sure I know the basics first.Thanks!EDIT: Will "Ethernet.maintain()" solve both concerns?
W5F Tantalum marking. Value? - Page 1
Forum section: electronics / projects

author: georgian
author_rank: Regular Contributor
timestamp: February 15, 2025, 01:26:57 pm
content: Hello,Can anybody tell me the value of this tantalum capacitor? It is the Ct on an MB3773 reset IC.Thanks a lot.

author: jwet
author_rank: Frequent Contributor
timestamp: February 19, 2025, 12:53:30 pm
content: Since you got no responses, I'll try.W5F is not a standard designator for tantalums.(W5F is a "house" number that high volume mfg's use to internally track parts and apps internally- this gives them control over what can go in this slot vs a standard number like 4.7 uF, 6.3V. Its also called "source control". The numbers and letters they use generally don't have any direct meaning- the 5 doesn't mean 5 uF, eg)Judging by the size and the app, my best guess would be 4.7 uF/10V. You can look at other dipped tantalums. The bar end is positive. You can kind of work backwards from the MB3773. A typical reset time is 100 mS and the voltage will 5 or 3.3. It could be a 6.3v rating but its in the 1-10uF range. Not very critical in most cases.

author: georgian
author_rank: Regular Contributor
timestamp: February 24, 2025, 08:00:26 pm
content: Thanks a lot. Well I guess the value is sort of critical since there are two MB3773. One had an 1uF Tantalum and this W5F measured as 100nF(too low??) I put an 4.7uF electrolytic but is has effect.I'll dig deeper. Thanks you for your time.

author: jwet
author_rank: Frequent Contributor
timestamp: February 24, 2025, 08:08:18 pm
content: One thing that has bitten me in systems with multiple supervisors is they use different timings. Examples might be in a motor controller, they let the uP go to do initialization but keep the motor amp disabled longer and then let it go after the uP has things set up. These staggered resets were common.
Wall-O-Matic Sonos Interface Project - Page 1
Forum section: electronics / projects

author: dkonigs
author_rank: Regular Contributor
timestamp: November 07, 2017, 01:26:04 am
content: This is a project I've been working on for several weeks now, and is finally at a stage where I have some good content to share!The basic idea is to design, build, and program a system that will let me take a Seeburg Wall-O-Matic (stereotypical 1950's diner tabletop jukebox remote) and interface it to my Sonos system. While I'm definitely not the first person to try and build something like this, I decided to use it as an exercise to see what I could accomplish.The project involved learning about 1950's era electromechanical devices, basic signal filtering, designing schematics and PCBs in KiCad, lots of programming with an ESP8266 (not yet blogged about) and putting it all together.Building a Seeburg Wall-O-Matic Interface (blog posts):Part 1 - Introduction (http://hecgeek.blogspot.com/2017/10/wall-o-matic-interface-1.html)Part 2 - Procuring a Functional Wallbox (http://hecgeek.blogspot.com/2017/10/wall-o-matic-interface-2.html)Part 3 - Decoding the Pulses (http://hecgeek.blogspot.com/2017/10/wall-o-matic-interface-3.html)Part 4 - Inserting Coins (http://hecgeek.blogspot.com/2017/10/wall-o-matic-interface-4.html)Part 5 - Designing the Circuit (http://hecgeek.blogspot.com/2017/10/wall-o-matic-interface-5.html)YouTube Videos:Wallbox Interface Test (on a breadboard) ()Wallbox Interface Assembly and Testing (with a real PCB) ()Project Resources:Complete KiCad project (https://github.com/dkonigsberg/wallbox-board)ESP8266 firmware code (https://github.com/dkonigsberg/wallbox-code)

author: dkonigs
author_rank: Regular Contributor
timestamp: November 20, 2017, 07:55:29 pm
content: Adding in the last blog post:Part 6 - Developing the Software (http://hecgeek.blogspot.com/2017/11/wall-o-matic-interface-6.html)

author: JSTAL
author_rank: Newbie
timestamp: January 02, 2018, 12:24:23 pm
content: Hi,Thanks for sharing this project.Very detailed - good professional job, awesome!!I'm in the middle of Purchase a wallbox 3W1 myself, and want also to connected it with my sonos speakers (Play1, Play 3).Would it be possible that I can Purchase the PCB board from you?Only naked board would be OK, components I can find locally and solder myself, but ofcourse an assembled PCB would also be great.If that is possible, what would be the price of it. (naked/assembled board?)Shipment should be to Belgium (Europe)Regards,Johan

author: dkonigs
author_rank: Regular Contributor
timestamp: May 27, 2018, 06:30:23 am
content: I'm sorry I didn't notice your reply for so long. Unfortunately I don't have any more spare PCBs, but all the necessary data to order one is available.If you want to order a PCB from OSH Park, the project is shared here:https://oshpark.com/shared_projects/5YB4LtISIf you want to use some other service, then fetch the KiCad project from the above links and generate the gerber files yourself.
Wall outlet / DC inverter transfer switch - Page 1
Forum section: electronics / projects

author: electr0de
author_rank: Newbie
timestamp: October 08, 2013, 02:27:27 pm
content: I am attempting to create a power supply switching device that will automatically and instantly switch from the wall outlet to a DC inverter connected to a car battery when utility power is lost. I am confused as to how to build this though as I have very limited experience, so forgive me if my current plan is flawed and incorrect.Here is a basic block diagram:Yes the point of this is to be able to play video games when the power is out.Where the 120V wall line splits and goes to the logic circuit, this is what I am planning and I am certain something is wrong which is what my questions are about:I know I will need a voltage divided by the transistor inputs but I don't know how to implement it.So is this possible to achieve using the method shown or do I need to do something totally different? I am also uncertain of what to do where the question marks are, as in whether it should be grounded or connected to something. Are there transistors that can be used for this application and how expensive are they? Any help that can be provided is most appreciated.Thanks a bunch!
"wall-wart" zip cord? - Page 1
Forum section: electronics / projects

author: ledtester
author_rank: Super Contributor
timestamp: March 14, 2021, 02:55:30 am
content: I'm wondering where you can buy the zip cord that you find with wall warts like:Uniform color - not red/black. Around the gauge in the pics -- i.e. about 24 AWG or so. Don't need plugs/strain reliefs on the ends -- just the bare cord although I'd consider buying finished cords if that was all that was available.Mouser has a small selection of "DC Power Cords" at about $1/foot. I'm sure you must be able to get the bare cord for less.Thanks!

author: ledtester
author_rank: Super Contributor
timestamp: March 14, 2021, 04:29:52 am
content: After some more searching I found this:https://www.aliexpress.com/item/32809762540.htmlTitle: 5M 2pin Tinned Copper Wire PVC 2P Lamp Lighting LED Strip Extension Cable 28/26/24/22/20/18/16 AWG Black Red/White 2468 UL2468Interestingly they don't call it "zip cord".

author: tooki
author_rank: Super Contributor
timestamp: March 14, 2021, 01:13:57 pm
content: Zip cord is a colloquialism for it. Not to mention that AliExpress is just about the worst arbiter imaginable for English terminology!!It took me just a few minutes to find multiple sources. (Including one that does indeed call it zip cord!) One vendor is Digi-Key: go there and figure out the right category, and then use the parametric search to narrow it down.You can often find it as speaker cord.

author: TimNJ
author_rank: Super Contributor
timestamp: March 14, 2021, 02:26:40 pm
content: You may have better luck if you search the actual UL-type identifier for the raw cord you want.These are some of the common ones used for DC cords:UL2468: Parallel conductors, "zip-cord", rectangular cross-sectionUL2464: Parallel conductors with round outer jacketUL1185: Spiral wrap, sort of like coax, round outer jacket

author: BradC
author_rank: Super Contributor
timestamp: March 14, 2021, 02:32:07 pm
content: Quote from: ledtester on March 14, 2021, 04:29:52 amWe call it "figure eight", although that might be an "Australianism" as much as "zip cord" is an "Americanism". Odd, my spell checker doesn't like "Australianism" but is happy with "Americanism".

author: rdl
author_rank: Super Contributor
timestamp: March 14, 2021, 11:11:03 pm
content: Also, it's often called "bonded wire". Mouser probably has what you want I just didn't have time to look.
Wanptek 30v/10A Power Supply any good? - Page 1
Forum section: electronics / projects

author: ElectricPower
author_rank: Frequent Contributor
timestamp: November 19, 2019, 02:42:10 pm
content: I bought this Power Supply yesterday: (The one to the left in picture)https://www.aliexpress.com/item/4000300017220.html?spm=a2g0s.9042311.0.0.27424c4d6KWGkjI have a plan to use this for my hobby projects. Is the quality okey?

author: coromonadalix
author_rank: Super Contributor
timestamp: November 19, 2019, 06:16:11 pm
content: It seems on the same quality that the ones we saw on a few threads here, medium quality, or poorly built ?? i would not put any sensitive or expensive equipment on theses and push them to their limits at 30v 10 amps (300 watts) or try to charge batteries on thesesmy 2 cents

author: rev0
author_rank: Contributor
timestamp: November 20, 2019, 04:34:57 am
content: I've got a KPS605D, older 60V 5A model. It's a cheap supply, not much to say about it, the coarse knobs are too coarse, and the fine ones a bit too fine. The 3-digit meter is pretty limiting, and inaccurate to boot (the difference between 4.1 and 4.2V is annoying when dealing with low voltage), going to replace it with a better 4-digit meter I'm waiting on. It also makes an awful hissing noise when in constant current mode, guess the switching PSU doesn't like that much.

author: ElectricPower
author_rank: Frequent Contributor
timestamp: November 20, 2019, 06:09:56 am
content: Okay. Thanks for replyI have allready bought it now, but i think it will hold together for my small tasks. Time will show
Wanptek TPS3010 power supply missing part - Page 1
Forum section: electronics / projects

author: gaminn
author_rank: Frequent Contributor
timestamp: March 28, 2024, 10:27:05 am
content: Hi,I purchased Wanptek TPS3010 power supply on AliExpress. I noticed, that it is missing a part which is normally present in this kind of power supplies. Please see pictures. What is the purpose of the part and should I add it to the PCB?FYI this power supply's case is completely unearthed and thus dangerous - PE connection point is perfectly isolated by black paint of the case.

author: kevin.gibbs
author_rank: Regular Contributor
timestamp: April 10, 2024, 01:14:54 pm
content: If the power supply is working, why add anything? The size of your photo is small, and the quality is poor. It's hard to see what part might have been installed there.

author: Hans_18T
author_rank: Contributor
timestamp: December 26, 2024, 02:30:42 pm
content: Have a look on youtube, search for "Wanptek Power Supply remote repair from China"
Want some ideas related to self test feedback loop for a project  - Page 1
Forum section: electronics / projects

author: haseeb zaib
author_rank: Contributor
timestamp: March 28, 2022, 11:13:53 am
content: Hello guysI am working on a project, which will have a built-in self-test feature. Now for selftest, all the main components need to have some kind of feedback loop so the microcontroller can know that they are functioning properly. The Components I want to self-test and in which I am confused about how to give a feedback loop to the controller from them components are as follow.1)12v PUMP2)FAN3)High voltage supply (30kv)now for a pump, I thought about using a flow sensor to see if the water is moving through the loop, but this is an invasive method as this will hinder the flow of water, therefore I am looking for another method.now for a fan, I am thinking about using the current sensor. My theory is that if something happens to fan or it is malfunctioning the current will surely increase/decrease from its normal values so I would know, but I am still open to suggestions if anyone got a better solutionnow for High voltage supply. This high voltage supply is for purpose of air cleaning and its rating is up to 30kv this is the most important component in the project which I have to know before starting the machine that it is working properly. I am open to all suggestions regarding how can I give a feedback loop from this to the microcontroller.Thank you :slight_smile:

author: Renate
author_rank: Super Contributor
timestamp: March 28, 2022, 04:16:54 pm
content: 4 wire fans have a tach output (i.e. +12V, PWM, tach, Gnd). Measuring current is much less reliable.You could use an ozone detector like MIKROE-1630 for the HV.
want to build a bench power supply with using 2 linear power supplys - Page 1
Forum section: electronics / projects

author: ss4sgoku
author_rank: Newbie
timestamp: November 29, 2020, 08:24:01 pm
content: hi i need some help/advice, im learning electronics and need a bench power supply but dont have enough money to buy a good one, so i was looking for a solution and find that many people make their own psu but they are not stable etc, i find the riden rd6006 rd6012 and rd6018 modules that looks fine... but they are not good enought they have some noise/interference i saw an evvblog video about it, somebody giveme 2 astron rs-20A linear power supplys and they are working fine i test them with a multimeters an osciloscope, they give 13.8vcd and 16A continuos maximun 20A they where used in radio transmision, so i would like to use them in my project, i want to use those astron in series so i can have almost 26v and 16a to work, im not sure what i need to make them a variable bench power supply that i can even control from my pc or use it to charge a battery or test a laptop or cellphones etc, i saw the bb3 project and looks nice but dont know where to buy the parts or if it will work with the power supplys that i haveplease helpmethanks for your help and kindnessfirst update 29/11/2020 this is the schematic:

author: tunk
author_rank: Super Contributor
timestamp: November 29, 2020, 09:02:21 pm
content: I can't help, but it may help if you open one and post some photos.And you will have to bleed off up to 4-500W so you will need somesubstantial heatsink/cooling. Also see if you can find schematics.

author: ledtester
author_rank: Super Contributor
timestamp: November 29, 2020, 09:45:24 pm
content: Here is a recent thread about designing a bench power supply:https://www.eevblog.com/forum/beginners/lm324-power-supply-with-variable-voltage-and-current/msg3345000/#msg3345000I've attached the RS-20A schematic found here:https://elektrotanya.com/astron_rs-20a_rs-20s_sch.pdf/download.html#dl
want to build an USB-Lin thingy, is there an API for the driver i could borrow? - Page 1
Forum section: electronics / projects

author: JPortici
author_rank: Super Contributor
timestamp: July 21, 2021, 07:30:35 am
content: Recently i've been working with LIN bus, to the point that i now need a device to listen on the bus and to act as a master or slave node for simulation purposes.I don't anticipate to be doing so much work to justify a PEAK or Kvaser interface so why the heck, let's design one.I have no problem in doing everything on my own, but it would be really awesome if there was an API i could borrow so that i can interface with existing software (busmaster for example)Is there such a thing?

author: 2N3055
author_rank: Super Contributor
timestamp: July 21, 2021, 08:42:13 am
content: Take a look at this..https://www.microchip.com/developmenttools/ProductDetails/APGDT001maybe can get some ideas...I didn't try it, but if it works good enough for your use case, maybe simpler to buy...
Want to know about heat gun handle - Page 1
Forum section: electronics / projects

author: AkibUddin
author_rank: Contributor
timestamp: November 21, 2022, 08:19:43 pm
content: This week me try to make hot gun circuit, So i want to know something about thermocouple monitoring circuits ! any one have any work flow idea about it ? please try to give brief information

author: JeremyLeaf
author_rank: Newbie
timestamp: November 21, 2022, 08:26:38 pm
content: I'm not quite sure what you're asking exactly, but thermocouples are a way of monitoring temperature very precisely. Your pinout shows that you have a thermocouple connection in the heat gun. You could try looking up thermocouple monitoring circuits?

author: Benta
author_rank: Super Contributor
timestamp: November 21, 2022, 09:10:43 pm
content: "Thermonuclear"? Holy Cow!

author: Gyro
author_rank: Super Contributor
timestamp: November 21, 2022, 09:21:31 pm
content: If the heating element resistance is 60R then it will be a mains one. It would be unwise to assume that the thermocouple is well insulated from the element (also looking at the cable cores), so the whole temperature measurement and control will need to be referenced to mains primary voltage. This has implications for the enclosure, insulation of the connector, controls etc.I don't know how much experience you have, but this may not be an ideal project, safety-wise.

author: AkibUddin
author_rank: Contributor
timestamp: November 23, 2022, 06:47:54 pm
content: Quote from: Benta on November 21, 2022, 09:10:43 pmSorry for my typing mistake & thank you for replay
want to make a KVM with PS/2 input and VGA output - Page 1
Forum section: electronics / projects

author: legacy
author_rank: Super Contributor
timestamp: May 03, 2019, 03:41:37 pm
content: I need to integrate a dedicated KVM into a project, and I'd like to make it by myself rather than buying a product. The first question is: hints on how making the analog multiplexer for the VGA stuff.

author: pwlps
author_rank: Frequent Contributor
timestamp: May 05, 2019, 01:34:24 pm
content: Quote from: legacy on May 03, 2019, 03:41:37 pmIf you want to design your own circuit, for the video part you can use a dedicated video switch IC like the LMH6570MA (as I understand what you need is a DPST, not SPDT ?). This one might be an overkill for your app (I know this one because I once needed very fast and clean RF switching), and you will need three of them but it will work (the datasheet specifies "Multi Input Video Monitor" as one of the possible applications).Edit: after a quick search I found this :https://www.maximintegrated.com/en/products/analog/analog-switches-multiplexers/MAX4360.html

author: legacy
author_rank: Super Contributor
timestamp: May 05, 2019, 03:20:12 pm
content: Quote from: pwlps on May 05, 2019, 01:34:24 pm{ R, G, B } analog signals, on a common analog ground.Plus { H, V } digital signals, on a common digital ground.

author: legacy
author_rank: Super Contributor
timestamp: May 05, 2019, 03:22:43 pm
content: I am also considering the TI TS5V330 Quad SPDT Wide Bandwidth Video Switch.It has a bandwidth of 300MHz, low on resistance of about 3 ohms but it only has 4 inputs.

author: SiliconWizard
author_rank: Super Contributor
timestamp: May 05, 2019, 05:36:47 pm
content: You can consider this:https://www.maximintegrated.com/en/products/analog/analog-switches-multiplexers/MAX4885.htmlPretty much an all-in-one integrated solution.

author: legacy
author_rank: Super Contributor
timestamp: May 05, 2019, 07:16:17 pm
content: Quote from: SiliconWizard on May 05, 2019, 05:36:47 pmthanks! It looks awesome!
Want to replace old electrostatic deflection CRT with LCD - ideas? - Page 1
Forum section: electronics / projects

author: LarryR
author_rank: Contributor
timestamp: September 21, 2021, 04:50:11 pm
content: Hi folks,Miti's FPGA project for the HP8594 CRT replacement looks great.I have been looking at creating a CRT to LCD conversion for my old Motorola R2012 communications analyser and I have looked at uP, FPGA and other solutions.The issue I have is that the R2012 uses both a 320x240 (7.8KHz x 60Hz) raster for on-screen data and straight analogue input to the CRT for o'scope display.The easy part is that it's basically 1-bit video (ie: no 1/2 bright highlighting is used on the Z axis)I'm thinking that a direct interface to the MC6809 bus to grab and buffer the raster video out is probably my best and cheapest route but that won't help with the straight out analog to the CRT.What cheap single-chip processor would have the a/d bandwidth (about 2.5MHz) to digitize everything and just create a frame buffer to display?I was looking at this project to see if I could adapt it to an X-Y display:https://www.instructables.com/Dual-Trace-Oscilloscope/Thanks for any ideas here....Larry

author: james_s
author_rank: Super Contributor
timestamp: September 21, 2021, 05:27:32 pm
content: Judging by the usefulness of XY mode on every digital scope I've tried it on, I'm skeptical of this working well. I'm curious to see if you manage to get anywhere with it though.

author: dmendesf
author_rank: Frequent Contributor
timestamp: September 21, 2021, 06:00:35 pm
content: What about a stm32 with ADC sampling the analog video (or maybe sampling with a comparator if it's really BW) and driving a LCD with the built-in LCD controller?

author: dmendesf
author_rank: Frequent Contributor
timestamp: September 21, 2021, 06:07:31 pm
content: Timer generates pixel clock (if not readily available somewhere) -> drives SPI CLOCK. Comparator drives SPI data. Buffer full triggers DMA. Vertical/horizontal refresh drives pin interrupts. The rest is left as an exercise to the reader

author: ErikTheNorwegian
author_rank: Frequent Contributor
timestamp: September 21, 2021, 06:33:17 pm
content: Maybe some ideas from these places...https://retrovoltage.com/2015/08/01/revitalize-hp-and-tek-digital-scopes-with-a-newscope-lcd-kit/

author: ErikTheNorwegian
author_rank: Frequent Contributor
timestamp: September 21, 2021, 06:35:08 pm
content: https://youtu.be/KZfj57kVzEI

author: dmendesf
author_rank: Frequent Contributor
timestamp: September 22, 2021, 01:24:13 am
content: Beaultifull but too expensive for 320x240 @ 1 bit...

author: LarryR
author_rank: Contributor
timestamp: September 23, 2021, 08:05:53 pm
content: Thanks for all the input & ideas folks.I think I may need to use a hybrid interface that both taps into the MC6809's data bus for the ASCII output and also the A/D inputs of the micro for the o'scope modes.That way, I won't need to sample at 4MHz and it will be easier to format the text output.I need to review if there is any text shown while in 'scope mode - I don't think so.Cheers,Larry
Wanted 1uF 250V - Page 1
Forum section: electronics / projects

author: NivagSwerdna
author_rank: Super Contributor
timestamp: October 14, 2019, 06:08:21 pm
content: I really like small SMD electrolytic caps e,g, EEVEB2E100Q but they are very expensive >£2... but so is a 1uF 250V ceramic... at least >£1 and >£2 in small quantitiesIs through hole radial electrolytic the only sensible choice for such a device?Thanks in advancePSI do need the voltage rating

author: JackJones
author_rank: Regular Contributor
timestamp: October 14, 2019, 06:18:02 pm
content: Film capacitors could be an alternative. I have a 1uF 450V through hole one right here on my desk which is about 10mmx10mm.It's this one specifically:https://lcsc.com/product-detail/CBB-Capacitors_CBB21Metal-film-capacitors-1uF-105-5-450V_C109544.html

author: jhpadjustable
author_rank: Frequent Contributor
timestamp: October 14, 2019, 06:56:35 pm
content: Ten yankeecents in 5-piece lots (plus customs duties, shipping, handling fees, blah blah):https://lcsc.com/product-detail/Multilayer-Ceramic-Capacitors-MLCC-SMD-SMT_Prosperity-Dielectrics-FS43X105K251EGG_C381468.htmlFive yankeecents in 10-piece lots (etc.etc.):https://lcsc.com/products/Aluminum-Electrolytic-Capacitors-SMD_418.htmlTHT 400V caps do have the advantage of being jellybeans in the off-line SMPS designer's stock.
Wanted: 500uA @ 1.8V - Page 1
Forum section: electronics / projects

author: NivagSwerdna
author_rank: Super Contributor
timestamp: October 08, 2019, 10:04:12 am
content: For my latest diversion I need approx 500uA at 1.8V to power some LP5569 chips...My initial attempt was using an AMS1117-1.8 but the output cap requirement is a bit of a pain from a cost and space point of view. I have regulated 5V to hand.If you needed 1.8V from 5V what device would you choose?A quick Google found TLV716/P but there are loads of other options.Thanks in advance

author: Whales
author_rank: Super Contributor
timestamp: October 08, 2019, 10:18:12 am
content: Zener-regulator style (ie parallel regulation instead of series regulation)? 1.8V diode + resistor + cap. 0.5mA is nothing.

author: JackJones
author_rank: Regular Contributor
timestamp: October 08, 2019, 10:55:48 am
content: I've used MCP1810 before for low current applications.http://ww1.microchip.com/downloads/en/DeviceDoc/20005623A.pdf

author: SiliconWizard
author_rank: Super Contributor
timestamp: October 08, 2019, 02:27:49 pm
content: TPS78218if you want an alternative to TI: XC6206

author: langwadt
author_rank: Super Contributor
timestamp: October 08, 2019, 04:35:09 pm
content: Quote from: NivagSwerdna on October 08, 2019, 10:04:12 amresistor and red led?
Wanted: ADC, 1MSPS, 16-bit, inputs > 5 V - Page 1
Forum section: electronics / projects

author: gmetaxas
author_rank: Newbie
timestamp: February 05, 2016, 03:28:30 pm
content: Hello everybody, I have been searching the Web for an ADC IC with the following features but have not found anything yet:Min. sampling rate: 1 MSPSResolution: 16 bitsInput voltage range: (this is the hardest part of all, I think) Inputs should swing well beyond +5 VI have recently used MAX1300 in an other design that can handle input voltage swings greater than +5 V, but it is way too slow for that application (sampling rate=115 kSPS). I have not managed to find anything close to that even at Maxim's website.Does anyone have any suggestion for such a part? I would appreciate your input very, very much.

author: Kleinstein
author_rank: Super Contributor
timestamp: February 05, 2016, 03:50:46 pm
content: ADCs with high input voltages are not very popular. Especially at high speed this would need a rather fast input amplifier.So I would forget about the >5 and plan with a divider for the input.

author: Cloud
author_rank: Regular Contributor
timestamp: February 05, 2016, 08:09:12 pm
content: I would use precision voltage divider (resistors with tolerance at least 0.5%) and for ADC I would check Linear or Analog devices.

author: Cloud
author_rank: Regular Contributor
timestamp: February 06, 2016, 06:16:19 am
content: Or maybe you can use something like thishttp://store.digilentinc.com/ad9467-250msps-16-bit-adc-fmc-card/
Wanted - Altium Protel example pick-place file please - Page 1
Forum section: electronics / projects

author: BitHead77
author_rank: Newbie
timestamp: July 13, 2015, 02:15:52 pm
content: Hi all - just got a pick-place machine with built-in computer that likes Altium CSV files for it to convert to it's own 'work file'.I don't have Altium - or Protel 99.I need to convert my old Protel PCB2.8 pik files.A small 'dozen-part' pick-n-place file generated by Altium or Protel99 should be all I need to see what column gets what.Thanks in advance.

author: Niklas
author_rank: Frequent Contributor
timestamp: July 13, 2015, 04:22:57 pm
content: Designator Footprint Mid X Mid Y Ref X Ref Y Pad X Pad Y TB Rotation Comment <CR><LF><CR><LF>R1 RESC5025X07N 31.9mm 5.036mm 31.9mm 5.036mm 34.2mm 5.036mm B 180.00 4R7 <CR><LF>C11 CAPC1608L 30.884mm 13.037mm 30.884mm 13.037mm 30.184mm 13.037mm T 360.00 1nF <CR><LF>U1 SOT89-150P350X160-3N 4.197mm 20.403mm 4.722mm 20.403mm 2.872mm 21.903mm T 360.00 LD2981ABU50TR <CR><LF><CR><LF>Columns separated by blank space, no tabs, and each line terminated by CRLF.The Comment field can look like this:In component Comment field1nF 1nF1nf 50V 1nf 50V (Blank space, perhaps parsed as two words)1nf/50V 1nf/50VEmpty <Just filled with blank space>Mid X = Ref XMid Y = Ref YPad X and Pad Y are coordinates for pad 1TB = Top or Bottom

author: BitHead77
author_rank: Newbie
timestamp: July 17, 2015, 01:45:52 pm
content: Thanks!Your reply just made me aware that there may also be an 'included quotation marks' issue.The end-recipient of my new file is a machine - may not care. But, if it balks, I now know there is something I should look into.This was my first post - I did not know there was an 'Altium' forum - but now I do and I posted the same request there. This thread should probably be re-directed to...EEVblog Electronics Community Forum »PCB/EDA Design »General PCB/EDA/CAD Discussions »Altium Designeror...https://www.eevblog.com/forum/altium/looking-for-an-altiumprotel99-example-of-pick-place-assembly-file/
wanted: board to Board connector to carry Differential Ethernet,  - Page 1
Forum section: electronics / projects

author: mrpackethead
author_rank: Super Contributor
timestamp: January 16, 2015, 08:10:25 am
content: Hi, I want to interconnect to 24 sets of Differential Ethernet signals, *( 48 pairs ) that are coming from an Ethernet Switching IC, ( on the PHY side of the ethernet transformer ), onto another PCB, where Ethernet Transformers and Output connectors will reside. For a whole bunch of reasons its not practical or possible to have the transformers on the same PCB.I need to as best as possible maintain matched impedances of 100R in the differential pairs, including the connectors.I'm contemplating something like an edge connector or some kind of Hirose or similar..In early days of design so anything is possible here. And was wondering who might have an intellegnet answer.

author: daqq
author_rank: Super Contributor
timestamp: January 16, 2015, 09:21:18 am
content: Molex has some items like that:http://www.connectortips.com/molex-speedstack%C2%99-mezzanine-connectors-achieve-40-gbps-data-rates/http://www.molex.com/molex/news/display_news.jsp?oid=1485&pageTitle=Impact%E2%84%A2+100-Ohm+Backplane+Connector+Scalable+Up+To+25+Gbps+Data+Rates&channel=News+In+Brief&channelId=-8Note that they are somewhat pricey. You can also use PCIe card connectors - IIRC they are required to have the same impedance. Be sure thought to mark the board as NOT PCIe lest some user tries his luck.

author: mrpackethead
author_rank: Super Contributor
timestamp: January 16, 2015, 08:05:47 pm
content: PCIe is an interesting option i might have a think about that. Its also affordable!
Wanted Ersa icon nano atmega code. - Page 1
Forum section: electronics / projects

author: Isad
author_rank: Frequent Contributor
timestamp: January 18, 2015, 11:25:04 am
content: Hi allSo about 2 weeks ago i bought aersa icon pico from a forum member.Yet it needed a repair andme as a idot have doen somthign and now the atmega chipis showing 56 ohm through the power input pins i knwosomeone will say its not the atmega but yes yes it is i havespeend 2h checking each componenet and i know for a fact that theADC inside is dead and its getting hot and even the linear voltage regulator get supperhot.Now i need to replace the chip but i need the code.Wich seems that it isnt aviable anywere.If somone has the code pls put it down in the comments.Thanks.
wanted: LED Const Current Buck Controller / Regulator - with Fault Monitoring.. - Page 1
Forum section: electronics / projects

author: mrpackethead
author_rank: Super Contributor
timestamp: October 03, 2016, 07:41:37 am
content: Hi, i'm Looking for a Constant Currnet controller ( with or without integrated Fets ) to do the following.Vin has to be a minium of 60VDC, preferably would ike more like 100V for a bit of head room.Current between 1 to 2ANeeds to accept PWM control for dimmingPreferably syncrhous for higher efficecnyIn built fault monitoring.. - Is the LED open circuit, / short circuit, / overtemp etc.. these faults need to come back on some kind of interface that can talk to a microprocessor.I found somethign that might do the job from Diodes Inc, but i'm looking for alternatives..Anyone want to make some suggestions.

author: mrpackethead
author_rank: Super Contributor
timestamp: October 03, 2016, 09:43:55 am
content: Quote from: blueskull on October 03, 2016, 08:13:59 amcould you point me to an example. I had not considered driving using a microprocessor directly to do this job, but its not a bad idea. I'd likely already have a useful low voltage so won't need an additional LDO. And since i need to do this 3 or four times perhaps one microprocessor, ( a suitably sized one ) could control multiple channels?

author: rfbroadband
author_rank: Unknown
timestamp: October 13, 2016, 03:59:24 am
content: Linear Technology...

author: dannyf
author_rank: Super Contributor
timestamp: October 13, 2016, 09:56:44 am
content: a simpler solution is to get a smps controller and implement your own fault monitoring. the smps modules for your spec (without fault monitoring) cost less than $5 and typically $1 - 2 each.
Wanted: low-cost, low-profile, automotive wire-to-board IMS connector - Page 1
Forum section: electronics / projects

author: DutchGert
author_rank: Frequent Contributor
timestamp: October 23, 2015, 08:19:18 am
content: Hey,Currently I am working on an automotive camera systems that will use LED's to illuminate the road in certain conditions.To do this I am using some high power IRLED's mounted on a IMS PCB (so only one layer of copper to mount stuff on). Because this board need to be connected to the driver circuitry that is mounted on a separate regular FR4 board that is mounted a few cm's away I am looking for a cheap, low-profile and shake proof wire-to-board system to connect both boards together.I want it to be as low-profile as possible because the LED's are only 2.4mm in height. Anyone has a good suggestion?

author: Scrts
author_rank: Frequent Contributor
timestamp: October 23, 2015, 09:01:17 am
content: And it has to be water-proof? Is it for OEM?We also do camera designs, but if we can not find connectors available - we have to do our own.Other than that - have a look into NanoMQS series.

author: DutchGert
author_rank: Frequent Contributor
timestamp: October 23, 2015, 01:55:17 pm
content: Quote from: Scrts on October 23, 2015, 09:01:17 amYes and yes.Now looking in too Molex Clik-MATE (http://www.molex.com/molex/products/family?key=clikmate_wiretoboard_connectors) and sealing it later with potting

author: promacjoe
author_rank: Regular Contributor
timestamp: October 24, 2015, 12:57:00 am
content: if you want to seal it up with any type of compound, you might as well not use a connector at all. A connector is used for easy service/manufacturing. Any kind of sealing compound, will make it impossible to disconnect it, making service almost impossible. run the wire directly into the passenger compartment and connect it there. alternatively there are several types of automotive connectors that are sealed or water resistant. even a standard utility trailer connector would work. but if you want to service it, don't glue it together.

author: Scrts
author_rank: Frequent Contributor
timestamp: October 27, 2015, 12:54:43 pm
content: Quote from: DutchGert on October 23, 2015, 01:55:17 pmAnd OEM will agree on this? The process and testing of this sealing technique will cost a lot. You should talk to OEM closely on connector selection. You should also ask if they have their own connectors, so you could use their proprietary ones.Going without a connector isn't an idea, because it will make manufacturing process on an assembly line too difficult.

author: nctnico
author_rank: Super Contributor
timestamp: October 27, 2015, 05:16:55 pm
content: Quote from: Scrts on October 27, 2015, 12:54:43 pmThat doesn't need to be the case. There are also systems where you can solder a bunch of wires crimped into pins into a PCB.
Wanted: LTspice model for BF458 or BF459 transistor - Page 1
Forum section: electronics / projects

author: Greybeard
author_rank: Frequent Contributor
timestamp: August 30, 2025, 08:23:29 pm
content: Can anyone help me find an LTspice model for the BF458 or BF459 transistor, or an equivalent?I've been googling for hours without success.

author: Ian.M
author_rank: Super Contributor
timestamp: August 31, 2025, 02:53:50 am
content: Bordodynov's standard.bjt has:Code:.model BF459 npn (IS=2.48E-14 VAF=45.7 BF=200 IKF=0.1509 NE=1.1981 ISE=1.668E-14 IKR=0.05 ISC=1p NC=1.5 NR=1 BR=5 RC=10 CJC=1.5E-11 FC=0.5 MJC=0.38 VJC=0.2 CJE=49p MJE=0.42 VJE=0.7 TF=1.7n ITF=1 VTF=20 XTF=100 RE=0.8)Note that this may actually be an alias of BF257.

author: Greybeard
author_rank: Frequent Contributor
timestamp: August 31, 2025, 06:29:04 am
content: Thanks!That was actually one of the first places I looked.But maybe I was only looking for BF458, the type used in my schematic.Later, I checked the BF457/458/459 datasheet. I probably didn't re-check all the model locations I looked previously.What parameter(s) do I need to change to use the BF459/257 model?

author: Ian.M
author_rank: Super Contributor
timestamp: August 31, 2025, 07:43:09 am
content: Probably none unless you are trying to model the transistor's avalanche breakdown characteristic. As noone sane would use a BF458/9 in a Jim Williams pulser, this is unlikely to be a problem. There is probably more variation between either BF458 or BF459 from different manufacturers than between BF458 and BF459 from the same manufacturer!Also although Alexander Bordodynov is an expert at LTspice simulation, we don't know *where* he got the parameters for this model from, though I noted they were suspiciously identical to those for BF257 and in another standard.bjt shared originally on the LTspice community Yahoo group, BF459 is defined as an ako alias of BF257, so its uncertain how accurate the model is in the first place.However if you do need to tweak the model to better fit your actual transistor this may give you some ideas:https://ecs.wgtn.ac.nz/foswiki/pub/Courses/XMUT204_2025T1/Demo/XMUT204%20Demo%206%20-%20BJT%20Circuit%20Simulation%20in%20LTspice%20-%20ppt.pdf

author: Greybeard
author_rank: Frequent Contributor
timestamp: August 31, 2025, 10:54:25 am
content: Thanks.My schematic is just a Y-amplifier from an old analog oscilloscope.I need the simulation as a reference to find the problem in the signal path.https://www.eevblog.com/forum/repair/owners-of-a-hameg-hm103-1-or-3-oscilloscope-can-you-help-me/msg6023495/#msg6023495
Wanted: Service Manual (& User Manual) EXACT Model 126 - Page 1
Forum section: electronics / projects

author: OPA27
author_rank: Newbie
timestamp: September 29, 2012, 12:57:40 pm
content: Hello,I unsuccessfully tried to find a service manual (& user manual) on the internet.EXACT Model 126I would be very glad, if someone could send me an electronic copy of the manual,i need it for a repair.Best regards from BerlinHarald

author: somlioy
author_rank: Regular Contributor
timestamp: September 29, 2012, 03:26:22 pm
content: Off topic, but; That copper layout.

author: T4P
author_rank: Super Contributor
timestamp: September 29, 2012, 08:13:57 pm
content: Quote from: somlioy on September 29, 2012, 03:26:22 pmLooks fantastic

author: karlmag
author_rank: Contributor
timestamp: December 14, 2013, 05:15:25 pm
content: Hi,I happened to come across one of these too just the other day.I haven't tested it much yet, but mine seems to work at least.In any case I would love to have both service- and user manual for it if anyone happens to know where to get them.Thanks! :-)Quote from: OPA27 on September 29, 2012, 12:57:40 pm

author: gigi
author_rank: Newbie
timestamp: June 02, 2014, 11:45:33 am
content: I need a service manual of Exact 126 too.Have you got one?

author: Sailor
author_rank: Regular Contributor
timestamp: June 02, 2014, 01:04:17 pm
content: Quote from: T4P on September 29, 2012, 08:13:57 pmAhh... Bishop crepe tapes and scalpel blades. Memories I can do without, thank you.

author: fluxcapacitor
author_rank: Frequent Contributor
timestamp: June 02, 2014, 01:52:23 pm
content: i found a user manual but its $25http://www.etestmanuals.com/Search.aspx?Mfg=EXA

author: M4trix
author_rank: Frequent Contributor
timestamp: June 02, 2014, 02:39:36 pm
content: Quote from: somlioy on September 29, 2012, 03:26:22 pmLooks like it's made before Protel and Accel Tango DOS.
Wanted: spice model of RG174/U cable - Page 1
Forum section: electronics / projects

author: tggzzz
author_rank: Super Contributor
timestamp: February 20, 2015, 12:36:30 am
content: I'd like to play around with modelling lossy transmission lines in spice (preferably LTSpice or TI-TINA). Does anyone have the relevant parameters for a lossy coax cable like RG174U.I'm not after anything very precise, but it would be good to have the right impedance, plus a plausible value for losses around, say 500MHz.Thanks

author: AlfBaz
author_rank: Super Contributor
timestamp: February 20, 2015, 12:55:47 am
content: There's a lib of various transmission line models, based on several common cables here that may be of use.It's intended for Orcad's spice so some of the models utilise spice directives not implemented in ltspice so some modification may be necessaryhttp://www.gunthard-kraus.de/Spice_Model_CD/Mixed%20Part%20List/Spice-Models-collection/tline.lib

author: tggzzz
author_rank: Super Contributor
timestamp: February 20, 2015, 10:51:36 am
content: Thanks. I've tried that and plugged values for r l c g into the TI-TINA model. Unfortunately if g is anything other than 0 it gives "model error"; I haven't yet looked to see what might be the cause.Edit: tried it in LTSpice and it gives the useful error message that g is not supported (unless l=c=0, r != 0). For the level of accuracy I'm after, that's sufficient.