hybridfree/eevblog-posts huggingface dataset:
Delete Delete Delete - Page 1
Forum section: electronics / beginners

author: The_Almighty_Bacon_Lord
author_rank: Contributor
timestamp: July 02, 2016, 10:58:45 pm
content: Delete Delete Delete

author: laneboysrc
author_rank: Contributor
timestamp: July 02, 2016, 11:18:00 pm
content: Hi!The "3 IC" version has an additional battery protection circuit which protects the battery from over-discharge.The other board is just the charger.cheers, Werner

author: Signal32
author_rank: Frequent Contributor
timestamp: July 03, 2016, 12:06:26 am
content: Indeed the smaller chip is a battery protection IC here's higher res pic:http://www.ic-fortune.com/eng/new_product1_1_1.asp?pno=DW01A-GThe 2nd one is marked as "8205A 14NGHT" in TSSOP-8, not sure what this one is.

author: rt
author_rank: Regular Contributor
timestamp: July 03, 2016, 01:32:54 am
content: The single IC board just contains a TP4056 charging IC. It charges to 4.2v and terminates.The 3 IC board contains the same TP4056 circuit plus a DW01-P battery protection chip (6 pin IC) with a dual MOSFET (8 pin).The boards above are just the reference designs in the datasheets.TP4056:https://dlnmh9ip6v2uc.cloudfront.net/datasheets/Prototyping/TP4056.pdfDW01-P:www.ic-fortune.com/upload/Download/DW01-P-DS-15_EN.pdfrt

author: Seekonk
author_rank: Super Contributor
timestamp: July 03, 2016, 11:14:28 am
content: The 4056 specs say you can use up to 0.5 ohm in series with the power. I suggest you do that as it makes the chip run a lot cooler. I charge a lot of discarded Li cells of unknown condition. That input resistor can be upped to several ohms to reduce initial charging current on questionable cells, final charging current remains the same.

author: gblades
author_rank: Contributor
timestamp: July 05, 2016, 01:23:40 pm
content: If you are only going to use the board to charge cells and then remove them get the basic version as you won't gain anything by getting the 3 ic one.If you are leaving the board connected to the battery so you can charge them up in situ then if you are using batteries with built in protection then again get the 1 chip version. If you are using unprotected cells however then the 3 chip version will also protect against over discharge and taking too much current.
What's the general efficiency of a 12v 100Ah tubular battery? - Page 1
Forum section: electronics / beginners

author: MrOmnos
author_rank: Frequent Contributor
timestamp: February 08, 2016, 06:22:07 pm
content: I have a UPS/Inverter system which consists of a 100Ah battery and a 800VA UPS. In an event of power outage these are the items that are running at any given time:1x9 watt CFL2x laptops (power brick says 90 Watts for one and 50 watts for other, we do not have laptop batteries inserted. I am not sure if the power consumption is same without laptop battery charging)1x raisecome passive optical network unit (datasheet says power consumption of <=10 watts at max load)1x Netis Router WF2419 (provided by ISP, power consumption unknown, requires 9v 500mA power brick. I am assuming 5 watts)So, Total Power consumption is = 9+90+50+10+5=164 ~ 165 watts= 165/0.8 = 206.25 VAAssuming battery efficiency is 90%, batter capacity = 90AhTherefore, amps = 206.25/12 = 17.2Total Backup time = 90/17.2 = 5.23 HoursNow the questionsFirst of all, is this calculation correct?I assumed 90% efficiency for the battery, is that the efficiency of a tubular battery found in the market?What is the power consumption of the a normal laptop without the battery charging?I don't have a power meter, should I use a MM to measure the current drawn by the laptops to know the power consumption?I am going through all this to check if my battery is working properly and just to learn about things. Thanks
What's the most useful forum on 3D printing? - Page 1
Forum section: electronics / beginners

author: salil
author_rank: Regular Contributor
timestamp: October 29, 2015, 03:30:12 pm
content: If you only have time to visit 1, what's the best forum site on 3D printing to visit regularly for help and learning?

author: Mechatrommer
author_rank: Super Contributor
timestamp: October 29, 2015, 06:21:09 pm
content: http://forums.reprap.org/

author: bitwelder
author_rank: Super Contributor
timestamp: October 31, 2015, 10:22:53 am
content: If there is place for a second one, I'd suggest the support forum for the 3D printer you are using.
What's the problem of my TV? How should I appraoch? - Page 1
Forum section: electronics / beginners

author: donnierofl
author_rank: Newbie
timestamp: February 17, 2015, 07:36:26 pm
content: I'm brand new here so I don't know tech terms so please bear with me.So I have a Samsung LCD TV LN-T5271F.The problem I'm getting right now is, the screen displays in to double.. So basically I have two screen being displayed in a single TV.. then... after 20 minutes it comes back to normal.. the single screen!It was getting annoying so I wanted to fix it therefore I dissected this poor thing.Well I was kind of hoping it would be the caps.. but it the device didn't want to be so nice to me =[So which would I have to replace? I was going to just buy the main board but I heard about the eevblog so I gave it a visit.I would greatly appreciate any help!Thank you and have a very awesome day

author: donnierofl
author_rank: Newbie
timestamp: February 17, 2015, 07:38:28 pm
content: I can't think of any other details that I need to include, but if you need me to fill you in, please do tell me so and I'd love to

author: SoundTech-LG
author_rank: Frequent Contributor
timestamp: February 17, 2015, 08:40:20 pm
content: You are going to need:An isolation transformer.The Service ManualA good scope.Intermittents require some good luck, and not quite everything is replacing caps.But who knows, maybe you will get lucky?

author: albert22
author_rank: Regular Contributor
timestamp: February 17, 2015, 10:46:56 pm
content: Sometimes temperature related faults are easier to find using a cooling spray. It could be useful in a first approach.
What's this blue TOYOCOM box? - Page 1
Forum section: electronics / beginners

author: dentaku
author_rank: Frequent Contributor
timestamp: November 07, 2013, 11:41:06 pm
content: I found 2 old but functioning Furuno LC-90 Loran C units in a dumpster a while ago. I removed a big blue plastic box from one of the circuit boards (boy this thing is stuffed with through hole parts tighter than anything I've ever disassembled). I have no use for it but I've salvaged some useful parts from it.It's says 100-BPF3 E-121 TOYOCOMWhat is it? I can't find anything online. It's just a box full of capacitors and what looks like inductors that have had the tops filled with glue with 4 legs coming out the bottom.

author: madires
author_rank: Super Contributor
timestamp: November 07, 2013, 11:54:56 pm
content: The blue box is a band pass filter. I'm not sure about the frequency but it could be the 130MHz band.

author: mos6502
author_rank: Frequent Contributor
timestamp: November 08, 2013, 12:07:29 am
content: LORAN-C is 100 kHz, so the number 100 would point to that, as do the rather large caps. So it's a 100kHz bandpass filter.

author: madires
author_rank: Super Contributor
timestamp: November 08, 2013, 12:47:00 pm
content: Yep, 100kHz makes perfectly sense.

author: dentaku
author_rank: Frequent Contributor
timestamp: November 08, 2013, 10:34:17 pm
content: I see. 100 is 100kHz and BPF stands for BandPass Filter.Quote from: mos6502 on November 08, 2013, 12:07:29 am
What's this chip with my video card?!  - Page 1
Forum section: electronics / beginners

author: newc22
author_rank: Newbie
timestamp: March 06, 2017, 02:31:27 pm
content: Hello All!I have got a video card ASUS 7790 2 GB OC some days ago my win7 freeze... it has got a blue screen...I take it and i saw one chip which gone.... (PC628) anybody know what's this?! And it is going to fix it?! Thanx the reply!!!<a href="http://www.kepfeltoltes.eu/view.php?filename=735vidkari.jpg" target="_blank">

author: RGB255_0_0
author_rank: Frequent Contributor
timestamp: March 06, 2017, 03:31:57 pm
content: Query failed3.Use the upload feature here or use imgur.
What's this component? - Page 1
Forum section: electronics / beginners

author: lpc32
author_rank: Frequent Contributor
timestamp: June 16, 2015, 03:10:20 pm
content: It's sitting right next to a DSL line input. If I recall, the label reads GD1.

author: Gyro
author_rank: Super Contributor
timestamp: June 16, 2015, 03:15:49 pm
content: It looks like a gas discharge tube surge suppressor (google). Quite common around telecoms lines, breakdown voltage will be in the 200V range. Not seen an smd one before.
What's this connector called? - Page 1
Forum section: electronics / beginners

author: DrDeke
author_rank: Contributor
timestamp: June 02, 2017, 08:38:09 pm
content: I need to buy a connector to connect to the V+/V- pins on this cheapie eBay dummy load / battery capacity tester, but I don't actually know what this type of connector is called. You see them all over the place on things, but I don't actually know what to search for on digikey/etc:Thanks in advance,DrDeke

author: janoc
author_rank: Super Contributor
timestamp: June 02, 2017, 08:54:03 pm
content: You mean the white thing? That looks like a JST connector to me. Fairly common for connecting LiPo batteries and such.https://www.digikey.com/products/en/connectors-interconnects/rectangular-connectors-headers-male-pins/314?k=JST%20connectorIf you want to get a mating connector you will need to buy the individual pins, a housing and then crimp that to a cable.

author: mariush
author_rank: Super Contributor
timestamp: June 02, 2017, 08:56:30 pm
content: I think this would be the right category :https://www.digikey.com/short/3dbtnz(pre-selected through hole, right angle , optional board edge headers)looks to me like some JST header , but could be something generic with standard 0.1" pitch

author: SoundTech-LG
author_rank: Frequent Contributor
timestamp: June 02, 2017, 09:15:09 pm
content: a few mfg's on those... and yes, crimp pins necessary as well.Molex here:https://www.digikey.com/products/en/connectors-interconnects/rectangular-connectors-housings/319?k=&pkeyword=&FV=1600002%2C1640001%2Cffe0013f%2Cffec8033%2Cffec1355%2Cffec1356%2Cffec1477&mnonly=0&newproducts=0&ColumnSort=0&page=1&stock=1&quantity=0&ptm=0&fid=0&pageSize=25

author: ebclr
author_rank: Super Contributor
timestamp: June 02, 2017, 09:50:49 pm
content: This may helpshttps://pt.aliexpress.com/item/10-Pairs-JST-1-25mm-2-Pin-Micro-Male-Female-Connector-Plug-80mm-Wires-Cables/32561360093.html?spm=2114.02020208.3.2.cS3Sa6&ws_ab_test=searchweb0_0,searchweb201602_2_10152_10065_10151_10068_5010019_10136_10137_10060_10138_10155_10062_437_10154_10056_10055_10054_10059_303_100031_10099_10103_10102_10096_10052_10053_10142_10107_10050_10051_10173_10084_10083_10080_10082_10081_10110_519_10111_10112_10113_10114_10182_10185_10078_10079_5030020_10073_10123_10189_142,searchweb201603_16,ppcSwitch_5_ppcChannel&btsid=0464da25-f4e5-49ee-9c99-9c3eafc4580d&algo_expid=13b6bbb2-9750-4c00-92c2-35e57013e5c7-0&algo_pvid=13b6bbb2-9750-4c00-92c2-35e57013e5c7
What's this electronic symbol? - Page 1
Forum section: electronics / beginners

author: LektroiD
author_rank: Frequent Contributor
timestamp: April 13, 2015, 02:00:26 pm
content: I stumbled upon this unusual symbol whilst looking at some old schematics. I've never seen one of these before...

author: TimFox
author_rank: Super Contributor
timestamp: April 13, 2015, 02:03:58 pm
content: Bi-directional switch: solid-state equivalent of a relay contact.

author: SeanB
author_rank: Super Contributor
timestamp: April 13, 2015, 03:56:15 pm
content: Older symbol for a CMOS ( or NMOS in some older chips) transmission gate. Basically a digitally controlled switch that can pass any signal, digital or analogue, that falls within the supply rails to the chip with only a series resistance. The resistance will be poorly defined, but will be somewhere between 3R and around 700R, depending on the voltage applied to the gate while the digital control selects whether the gate is low resistance or very high resistance ( in the multi megohm range) so acting as a switch.

author: Zero999
author_rank: Super Contributor
timestamp: April 13, 2015, 04:42:06 pm
content: Yes, it's an analogue switch, as mentioned above, the signal has to be within the supply rails and it doesn't offer any isolation.http://eent3.lsbu.ac.uk/units/b3embsys/Week11Combinational%20Logic%20Circuits.htm
What's this transformer in my schematic? - Page 1
Forum section: electronics / beginners

author: SethGI
author_rank: Regular Contributor
timestamp: August 07, 2017, 10:43:32 pm
content: Hi all,I came across this symbol in a schematic. I'm trying to source a compatible part. Symbol would have me think its a standard iron-core transformer, but it's labled FER which makes me think ferrite. Also the '190' number is a bit confusing as I have no idea what it's referring to. Any ideas?Thanks!-Seth

author: Zero999
author_rank: Super Contributor
timestamp: August 07, 2017, 10:47:13 pm
content: Probably a common mode filter choke.Can you please post the complete schematic? Or have you signed some sort of contract, saying you can't publish it?

author: Benta
author_rank: Super Contributor
timestamp: August 07, 2017, 10:58:19 pm
content: It's a "pig's nose" ferrite core.I have to agree with Hero999, your way of posting is "gimme an answer, but I won't tell you what it's about".Not really useful for anyone but yourself.

author: SethGI
author_rank: Regular Contributor
timestamp: August 08, 2017, 11:39:57 am
content: Good point, here it is. The reasons I didn't initially include it are firstly it's a huge schematic and I didn't want to force people to go through it. Also I've had a few experiences on this forums and similar where I share an overly-ambitious project and people tell me it's dumb and I shouldn't waste my time trying. Let me quickly justify by saying I'm in no rush, and am giving myself well over a year to do this. I know it's going to be very challenging, but that's the point.Thanks for the help.http://www.analog.com/media/en/dsp-documentation/evaluation-kit-manuals/ADSP-21479_ezboard_man_rev.1.1.pdf

author: Gyro
author_rank: Super Contributor
timestamp: August 08, 2017, 11:51:27 am
content: Well according to the Bill of Materials in the document, it's a Murata DLW5BSN191SQ2 100MHz common mode choke. Datasheet in this link...http://eu.mouser.com/ProductDetail/Murata-Power-Solutions/DLW5BSN191SQ2/?qs=%2f7R%2fnUXKGogKHEQqVbTJYA%3d%3dCorrection:https://media.digikey.com/pdf/Data%20Sheets/Murata%20PDFs/DLW5AH_BS_Series_RevMay_2011.pdf
what's this type of speaker connector called? - Page 1
Forum section: electronics / beginners

author: dentaku
author_rank: Frequent Contributor
timestamp: December 23, 2013, 02:25:48 am
content: Someone just let me borrow a Technics SU-V40 amplifier and I like the way the speaker wires connect.What are these speaker connectors called?http://i.ebayimg.com/00/s/NzU3WDEyODA=/z/Kd4AAMXQlgtSsPXO/$_57.JPG
What's this? - Page 1
Forum section: electronics / beginners

author: Skippy
author_rank: Contributor
timestamp: May 27, 2012, 10:47:25 pm
content: Can anyone identify what this is? Want to buy some, but it would be easier if I knew what they were called....It's a crimp terminal of some sort- a wire goes in and you crimp it. The other end is a kind of spring loaded fold of metal that clips into a socket and stays put, but you can apply pressure and pull it out.Any ideas?

author: Psi
author_rank: Super Contributor
timestamp: May 28, 2012, 12:11:39 am
content: Can you post a closeup in-focus pic of both the terminal and the connector it fits into?

author: FenderBender
author_rank: Super Contributor
timestamp: May 28, 2012, 12:16:24 am
content: Is that from a computer power supply connector?If that is what they are, you can buy some here:http://www.frozencpu.com/products/9673/ele-599/FrozenCPU_ConnectRight_ATX_PCI_EPS_Gold-Plated_Connector_Pins_-_Female_-_4_Pack.htmland here:http://www.frozencpu.com/products/1789/ele-132/FrozenCPU_ConnectRight_ATX_PCI_EPS_Connector_Pins_-_Female_-_4_Pack.html

author: JSnyder
author_rank: Contributor
timestamp: May 28, 2012, 12:39:21 am
content: It looks like the wiper from a standard Molex type of connector. Very common, we need a picture of the plastic connector it came out of to find a suitable replacementhttp://narkedat90.com/shop/product/molex_connectors/Doing a search for Molex KK pin or connector should give you some close results

author: pickle9000
author_rank: Super Contributor
timestamp: May 28, 2012, 01:05:53 am
content: 08-50-0106 Molex...mike

author: Skippy
author_rank: Contributor
timestamp: May 28, 2012, 10:55:03 am
content: Sounds pretty reasonable. It's attached to the neon indicator bulb in a kettle, and is used to attach to the base of the kettle. It hasn't come out of any kind of housing though. I'm trying to replace the bulb (yeah, I know, really high level electronics).The main difference between this and the Molex seems to be that it has a hole in the middle of the prong, but I guess something like this Molex could work.
What'd be a good forum to ask "simulation/modeling" doubts? - Page 1
Forum section: electronics / beginners

author: shivajikobardan
author_rank: Contributor
timestamp: July 11, 2022, 01:31:56 pm
content: http://ioesyllabus.blogspot.com/2015/05/simulation-and-modeling-ct-753-syllabus.htmlthis isn't very computer science. more like grad level cs if any. not very electronics. is it math? what forums would be most relevant to ask these questions?

author: rstofer
author_rank: Super Contributor
timestamp: July 11, 2022, 02:02:34 pm
content: Maybe a forum related to MATLAB Simulink. I did a Google search for 'MATLAB Simulink' and came up with quite a few replies. MATLAB itself will have forums like:https://www.mathworks.com/matlabcentral/?s_tid=gn_mlcSimulation of electronic circuits tend to be done with LTspice and there are a lot of sources for information.

author: shivajikobardan
author_rank: Contributor
timestamp: July 14, 2022, 07:07:14 am
content: it's not real practical simulation, it's mainly only concepts and textbook examples. so i am unsure if that'd be relevant there?

author: MarkF
author_rank: Super Contributor
timestamp: July 14, 2022, 01:21:07 pm
content: "Is it math?" Short answer: YesI've been involved in modelling and simulation for over 35 years. With concentrations with sonar systems, ocean acoustics, ship and submarine models, cockpit and flight models. Basically, modelling is solving math equations and/or logic problems. Simulation tasks involved would be: solving equations, communication between and within modules for control, logic involved with reading switches and driving gauges, displays and specialized hardware, etc.The Syllabus shows the tasks involved in developing a simulation environment, plus more. Something not readily apparent are "random numbers". Random numbers and their distribution can be used to provide background noise. If you wanted to generate broadband noise you would generate random numbers representing frequencies and band filter it.In addition, there is the whole life cycle development process: design, review, code, test, maintenance.The course looks like a pretty comprehensive introduction to modelling and simulation techniques and methods.So, was there a question?

author: rstofer
author_rank: Super Contributor
timestamp: July 15, 2022, 01:59:54 am
content: I would have thought that the 2d order ordinary differential equation for the mass-spring-damper would have come up a lot sooner than Chapter 10 (the last chapter). That is my favorite analog computer demo problem.
Whats inside this transistor? - Page 1
Forum section: electronics / beginners

author: Beamin
author_rank: Super Contributor
timestamp: July 18, 2017, 01:55:02 pm
content: Hello!I recently "tore down" this transistor with HCl and heat. Two legs were lost in the process. Sadly it can't be repaired.My question is this:There are three parts: The back plate, the middle square that seems to have a boundary from the back plate, and the small off center square in the front.Which part is the actual transistor? Just that little square on top? Or is the base the back plate, collector the middle plate, and the emitter the small square on top? (Guessing the smallest part is the emitter since it can handle the least amount of current and therefore heat.)

author: mikerj
author_rank: Super Contributor
timestamp: July 18, 2017, 02:28:03 pm
content: That little square is the entire transistor! If you hadn't dissolved them, you'd also have seen two sets of bond wires attaching the base and emitter pins to the top of the die.

author: Beamin
author_rank: Super Contributor
timestamp: July 18, 2017, 02:52:03 pm
content: Quote from: mikerj on July 18, 2017, 02:28:03 pmSo is the NPN junction under that little square?

author: rstofer
author_rank: Super Contributor
timestamp: July 18, 2017, 03:10:47 pm
content: Probably not... The little square is the entire transistor. The back plate is the heatsink and will be electrically connected to either the collector or emitter but not for semiconductor purposes just to help get the heat away from the device.

author: free_electron
author_rank: Super Contributor
timestamp: July 18, 2017, 03:14:00 pm
content: the junctions are a thin layer on top of that little square.

author: Beamin
author_rank: Super Contributor
timestamp: July 22, 2017, 06:34:37 pm
content: Its strange that it seems like they just stuck the transistor to the plate at an off center angle. Is that on purpose or do some just come out crooked??

author: mikerj
author_rank: Super Contributor
timestamp: July 23, 2017, 09:40:58 am
content: It's probably to align the base and emitter bonding pads on the die with the pins on the package, to minimise bond wire length.

author: tronde
author_rank: Frequent Contributor
timestamp: July 23, 2017, 03:57:21 pm
content: Almost the same, but a different package.TO3 (as in the image below), TO5 and TO18 metal transistors are easy to open without damaging the chip or wires.https://commons.wikimedia.org/wiki/File:Darlington_transistor_MJ1000.jpg#/media/File:Darlington_transistor_MJ1000.jpg
What's missing from this USB connection? - Page 1
Forum section: electronics / beginners

author: Avelino Sampaio
author_rank: Frequent Contributor
timestamp: December 12, 2022, 12:54:32 pm
content: I have this simple usb connection, on this DC-DC converter output. The problem is that my cell phone does not indicate charging. I suspect that the cell phone needs the data lines (d+ and d-) to recognize the charger. If so, what exactly do I need to report on these lines of data?

author: Avelino Sampaio
author_rank: Frequent Contributor
timestamp: December 12, 2022, 03:56:05 pm
content: HiLooking at some charger schemes, I noticed that they use two resistive dividers, configured for 2.7v (D-) and 2v (D+).Resolved.

author: wraper
author_rank: Unknown
timestamp: December 12, 2022, 04:00:28 pm
content: The simplest variant is connecting D+ and D- together. Different phones detect allowed current differently, so not necessarily it will charge at the highest current possible.

author: langwadt
author_rank: Super Contributor
timestamp: December 12, 2022, 04:04:51 pm
content: There are several schemes, but the USB standard for a charger is D+ and D- shorted together

author: Avelino Sampaio
author_rank: Frequent Contributor
timestamp: December 13, 2022, 10:39:54 am
content: HiI was flying blind but found myself with this TI datasheet (TPS251XX).https://www.ti.com/lit/ds/symlink/tps2514.pdf
What's needed for Bluetooth (bare bones) functionality  - Page 1
Forum section: electronics / beginners

author: Ram80
author_rank: Contributor
timestamp: September 21, 2024, 08:27:54 pm
content: I want to add Bluetooth functionality, so just the bare chips, no pre assembled board. I need a Bluetooth chip and crystal oscillator. That's all I know so far but I'm sure there's more to it.Can anybody advise or give a link to a decent article as to what I need to design and add to have functioning in Bluetooth.I would be using an stm32 MCU, and a 16mb flash ram.

author: coppice
author_rank: Super Contributor
timestamp: September 21, 2024, 08:38:46 pm
content: Is this for hobby use or production?For production stick with BT modules unless you are making millions. The approvals processes cost a lot, and modules can greatly help with the speed and cost of completing that. Because so many people use modules for products selling in large number there is a mature market selling them at low prices. That is, they are sold at "production" rather than specialised prototyping prices.For hobby use the appropriate choice is really based on your level of masochism.

author: glebkooo
author_rank: Contributor
timestamp: September 21, 2024, 09:04:18 pm
content: +1 to advice about using BT modules. Designing a proper RF part for the bare chip seems difficult to me.I would replace stm32 MCU with nRF52840 from Nordic Semiconductor. Nordic provides high quality documentation and a reference design -https://docs.nordicsemi.com/bundle/ps_nrf52840/page/ref_circuitry.htmlThat will give you an insight of what have to be done to make it functioning. If you would decide to use BT modules, these guys (Holyiot) are selling nRF-based boards of different kinds:https://www.aliexpress.com/store/420533Another option would be to use, for example, ESP32C3 from Espressif. However, this is WiFi + BT SoC.

author: ataradov
author_rank: Super Contributor
timestamp: September 21, 2024, 09:14:32 pm
content: If you are already using STM32, and you actually need a simple IC and not the module, you may want to consider STM32WB55/35.In addition to what you have listed, you will need an antenna and a matching circuit. And tuning that without specialized equipment is next to impossible. So, unless you already have this, I'd certainly consider using a module.

author: coppice
author_rank: Super Contributor
timestamp: September 21, 2024, 09:22:13 pm
content: Quote from: ataradov on September 21, 2024, 09:14:32 pmYou missed expertise. Anyone asking these questions probably doesn't have the relevant microwave expertise.

author: Ram80
author_rank: Contributor
timestamp: September 22, 2024, 06:06:10 am
content: Quote from: glebkooo on September 21, 2024, 09:04:18 pmGood shout on the nRF52840, this is perfect for my needs. Thanks.I ideally want to keep the design as small as possible. The BT modules add more bulk.
Solved-What's so wrong with this AC model , no internal caps - Page 1
Forum section: electronics / beginners

author: MathWizard
author_rank: Super Contributor
timestamp: February 18, 2023, 07:38:52 pm
content: I'm just calculating some ABCD paramerters for some amplifiers and I thought I knew this by now, but I can't figure out why the BJT sim, is so different to my AC model sim, just for a CE amp.I my calculations for A and D match the model spot on, with and without the bypassed emitter, Iin should be 411nA. But the BJT model keeps giving a Iin value about 1.3uA, so ~3x bigger than my calc and the 2 models.What little thing am I forgetting or overlooking this time ?I have IB=756.9nA, and D=rm*Gin=3.836mA/A for when RE/Ce is ignoredWould the hybrid-pi model with caps fix this? I'm ready to learn that again, I just never got to using it last time.

author: MathWizard
author_rank: Super Contributor
timestamp: February 18, 2023, 08:06:20 pm
content: Ok so just adding 20p between base collector, and 1p on b-e, I get near 1.2uA Iin in the models, so ok I'll have to learn that stuff next.
Whats that Part? - Page 1
Forum section: electronics / beginners

author: Axel1973
author_rank: Regular Contributor
timestamp: December 25, 2011, 10:45:37 am
content: Hi!Anyone got a clue what Part this is and where to get its Datasheet? (see attachments)i been unlucky yet to find anything matchin on the net.Thanks !Axel

author: PeterG
author_rank: Frequent Contributor
timestamp: December 25, 2011, 11:50:03 am
content: I would guess its some sort of oscillator, but thats a guess.Regards

author: metalphreak
author_rank: Frequent Contributor
timestamp: December 25, 2011, 03:05:45 pm
content: crystals have only 2 pins, resonators 3, and it looks too small to be a heated temperature controlled oscillator. A lot of SAW filters and other RF things come in similar looking cases?Is it a part you found or did it come off a device you have?

author: Axel1973
author_rank: Regular Contributor
timestamp: December 25, 2011, 04:05:23 pm
content: i salvaged it from an old tv receiver card for a ancient notebook as far i remember.no further information available about it.

author: ejeffrey
author_rank: Super Contributor
timestamp: December 28, 2011, 05:03:09 am
content: Quote from: metalphreak on December 25, 2011, 03:05:45 pmA bare crystal only has 2 pins but a crystal oscillator would have 3 or 4.

author: PeterG
author_rank: Frequent Contributor
timestamp: December 28, 2011, 06:27:29 am
content: I was thinking it looks like a 4 pin Crystal Oscillator.Regards

author: oPossum
author_rank: Super Contributor
timestamp: December 28, 2011, 10:11:49 am
content: It is a SAW filter.

author: Axel1973
author_rank: Regular Contributor
timestamp: December 28, 2011, 02:10:15 pm
content: Quote from: oPossum on December 28, 2011, 10:11:49 amFound any Datasheet?
whats the best low cost programmer for firmware  - Page 1
Forum section: electronics / beginners

author: nikki81
author_rank: Newbie
timestamp: August 25, 2013, 11:56:33 pm
content: whats the best low cost usb programmer for firmware/roms on parallel and spi nands/nor and eeproms ect. Ive got a box of stuff that i need to fix that have had bad firmware flashes ive been told about a progskeet v1.1 but ive not had any luck finding one and looking on ebay has just confused me even more with the raft of Chinese programmers. i was looking at a teensy 2.0++thanks

author: MrAureliusR
author_rank: Unknown
timestamp: August 26, 2013, 01:25:02 am
content: I think the MiniPro TL866 is great. I've got one and it works flawlessly.Can you give some examples of what you need to program? That will help us to help you.

author: nikki81
author_rank: Newbie
timestamp: August 26, 2013, 02:23:11 am
content: I have a few android TV sticks to repair a Chinese tvpad box a few mini itx motherboards and a few modems. I have managed to fix a few things off the pile with my bus pirate but it is limited the spi device s only. I have just seen the eevblog video about the mini pro it looks like I nice piece of equipment.

author: fluxcapacitor
author_rank: Frequent Contributor
timestamp: August 26, 2013, 02:27:51 am
content: +1 for the TL866 ,great programmer.Do the mini itx boards have sop8, dip, plcc32 soldered etc .You might need a JTAG to debrick the modems modem/router ?

author: fluxcapacitor
author_rank: Frequent Contributor
timestamp: August 26, 2013, 02:41:26 am
content: these may help you if the android sticks are MK808 based :http://www.freaktab.com/showthread.php?1943-NEW-Unbrick-or-fix-NAND-on-the-MK808http://www.erodov.com/forums/unbrick-hard-bricked-android-mini-pc-using-mask-rom-mode/61371.html

author: nikki81
author_rank: Newbie
timestamp: August 26, 2013, 10:31:52 am
content: thanks for the links the remainder of the motherboards have dip 8 packages nice and easy to remove and pop in the programmer
PLEASE DELETE - What's the best way to hot shot components on a board - Page 1
Forum section: electronics / beginners

author: FearTec
author_rank: Regular Contributor
timestamp: September 13, 2020, 10:22:03 pm
content: PLEASE DELETEHi I'm looking to hot snot some components down professionally and not with a hit glue gun. What do professionals use?

author: FearTec
author_rank: Regular Contributor
timestamp: September 13, 2020, 10:23:05 pm
content: Deleting, double post
What's the best way to make a waterproof solder joint? - Page 1
Forum section: electronics / beginners

author: e1p3dr0
author_rank: Contributor
timestamp: June 22, 2021, 10:54:14 am
content: Looking for your techniques on how to make a waterproof solder joint.I've come across various different ways like liquid tape, self-amalgamating tape, silicone under shrink wrap, but would welcome your experiences.

author: SuzyC
author_rank: Frequent Contributor
timestamp: June 22, 2021, 10:59:21 am
content: Solder it. Coat it(optional) with (depending on high voltage/high-low temps/water pressure/flexing/saltwater/chemical environ): silicon grease/superglue --->double heatshrink with (optional)drop of adhesive/silicon grease/superglue under first layer heatshink tubing. Top heatshrink tubing should ~1-cm excess each side end of bottom heatshrink over soldering point.

author: fordem
author_rank: Regular Contributor
timestamp: June 22, 2021, 03:29:36 pm
content: My preference is marine grade heatshrink tube - this is similar to regular heatshrink tube but has a thicker wall and contains a heat activated adhesive that seals to the wire insulation and soldered joint. I've also used the self amalgamating tape, but that does not work well on smaller joints.

author: fourfathom
author_rank: Super Contributor
timestamp: June 22, 2021, 03:33:35 pm
content: A wire-to-wire joint? Yes, the adhesive-filled heat-shrink. Marine-grade stuff is available (ANCOR brand, for example), but you can also find it in most hardware stores as it is used when wiring submersible well-pumps.
What's the cheapest way to mesure power of RF output(such as wifi router) ? - Page 1
Forum section: electronics / beginners

author: youta556
author_rank: Contributor
timestamp: April 21, 2022, 06:45:48 pm
content: I want to compare output power of 2 wifi routers.Both 2 routers have sma antenna ports.I have no professional power meter such like keysight V3500A,bird 43.What's the cheapest way to mesure power of RF output(such as wifi router) ?

author: cdev
author_rank: Super Contributor
timestamp: April 21, 2022, 07:43:13 pm
content: Hi! Welcome to eevblog!A wifi router's power output is very small and high enough in frequency (2.4 GHz ) that measuring it is likely fairly difficult.A directional coupler might help. I was able to get a field strength meter to deflect.. It used an 1N34 diode as its detector.A dummy load might help.. a non-reactive 50 ohm resistive load..Which router has an SMA jack for its output?

author: Ice-Tea
author_rank: Super Contributor
timestamp: April 21, 2022, 07:51:41 pm
content: Decent chance you'll find they are the same or very comparable. There's a regulatory limit. Unless you're taking bottom dollar units, you can be pretty sure they're turned up as far as allowed.

author: cdev
author_rank: Super Contributor
timestamp: April 21, 2022, 09:03:48 pm
content: MiniCircuits sells power detector modules that may be exactly what you want, giving you what is in effect a sensitive RF power measurement device.

author: dcarr
author_rank: Regular Contributor
timestamp: April 21, 2022, 09:25:57 pm
content: Search eBay for "crystal detector sma" and "diode detector sma".These accept RF on the input SMA and produce a voltage proportional to the power in dBm on the output connector. You can read them out with a voltmeter for steady signals or with a oscilloscope for pulsed signals. It looks like there are options from $30-70 that would work at 2.4GHz.

author: ledtester
author_rank: Super Contributor
timestamp: April 22, 2022, 03:13:54 am
content: Two "out of the box" ideas...1) a "wifi signal strength" phone app; I have one that shows dBm -- might be good enough for at least a comparison2) look up the test results filed with the FCC; go tohttps://fccid.io/<FCC ID>, e.g.:https://fccid.io/W5HSBG6580

author: dcarr
author_rank: Regular Contributor
timestamp: April 22, 2022, 03:26:00 am
content: Quote from: ledtester on April 22, 2022, 03:13:54 amThis is clever. I like it.
Whats the difference - Page 1
Forum section: electronics / beginners

author: Spark-Doctor
author_rank: Contributor
timestamp: December 09, 2019, 09:27:03 pm
content: As the title says, whats the difference between these two capacitors,https://www.rapidonline.com/kemet-r82dc3100aa50k-100nf-63v-5mm-polyester-box-capacitor-10-3260https://www.mouser.co.uk/ProductDetail/KEMET/C0805C104KMREC7210?qs=sGAEpiMZZMs0AnBnWHyRQN7%2FAA2D2lPPiNnp3wDfsnbj3Ps1TMyQ%2FQ%3D%3DPlease don't say "one is SMD, the other is through hole", i know that alreadyI am more interested in why you would chose one over the other.Many thanks in advanceIan

author: David Hess
author_rank: Super Contributor
timestamp: December 09, 2019, 11:15:12 pm
content: X7R ceramic dielectric can have a quite large voltage coefficient of capacitance which limits it to decoupling applications. This will also cause distortion in filters.Metalized film is self healing while ceramic tends to fail with a short.
whats the difference between a differential comparator and a general purpose one - Page 1
Forum section: electronics / beginners

author: Simon
author_rank: Unknown
timestamp: July 08, 2014, 12:20:16 pm
content: Looking through digikey for comparators, some are marked as general purpose and some as differential. What is the differential.... uh, I mean difference

author: tszaboo
author_rank: Super Contributor
timestamp: July 08, 2014, 01:13:51 pm
content: If I understood it correctly, differential comparators are supposed to be used on one differential signal, while general purpose comparators are for two single end signals. And the output structure can be significantly different (no pun intended), like the output can be also differential. I dont think this naming is used consistently, or it is any good although.

author: Simon
author_rank: Unknown
timestamp: July 08, 2014, 01:31:08 pm
content: hm, still not clear to me, the comparator looks at two voltages and switches accordingly, Your comments sound like what I'd expect for opamps etc, I'd not expect comparators to know the difference.

author: jpb
author_rank: Super Contributor
timestamp: July 08, 2014, 01:38:46 pm
content: someone asked the same question on stack exchange a couple of years ago:http://electronics.stackexchange.com/questions/33961/what-is-the-difference-between-a-general-comparator-and-a-differential-comparatoThe answers he got indicated that all comparators are differential comparators (as you surmise).

author: Simon
author_rank: Unknown
timestamp: July 08, 2014, 02:11:21 pm
content: yea that is what I was thinking, seems even digikey has it's quirks (I got fed up with farnell) when it comes to reading datasheets. I just spoke to their support to ask: "where are the standard drop out linear regulators" they have put them all under LDO, the fact that the main control element in each of the two types is totally different went right over his head, oh but then there is a linear and switching category together.
What's the difference between isotropic and anisotropic motors?  - Page 1
Forum section: electronics / beginners

author: bonzer
author_rank: Regular Contributor
timestamp: November 26, 2019, 11:17:47 am
content: Hello everyone, What's the difference between isotropic and anaisotropic motors? For example in case of IPM/SPM motors? Can someone help me please to understand this.For example in magnets there's a preferential direction for the axis of polarization in anisotropic magnets. Here I've just seen sum images of the structures that are different but I really don't get why some are called anisotropic and others isotropic.

author: bonzer
author_rank: Regular Contributor
timestamp: November 27, 2019, 09:27:10 am
content: What I've seen so far is that the shape of the rotor changes so in isotropic case it's not symmetrical and because of that it is easier to be moved by magnetic fields applied

author: bonzer
author_rank: Regular Contributor
timestamp: November 27, 2019, 07:05:27 pm
content: SOLVED!It's all about the rotor structure. In SPM motors it's isotropic so there's no priority for any direction of the fields generated by surface pm while in IPM type they put pm inside the rotor in such a way to make it possible so in the end it gives additional torque cause by that reluctance effect. See the image for the comparison.

author: max_torque
author_rank: Super Contributor
timestamp: November 28, 2019, 12:22:25 pm
content: The other word to seach around is " Magnetic saliency"For an SPM with a uniform rotor core, peak torque occurs when the stator field is precisely aligned with the quadrature (q) axis, ie 90 deg to the direct (d) axis.For an IPM, with high saliency, the position of peak torque is directly dependant upon that saliency, and the position of peak torque is skewed towards to d axis. How far it is skewed depends upon both fixed geometrical effects, and dynamics ones such as reluctance and saturation.
what's the difference between these wires?  - Page 1
Forum section: electronics / beginners

author: vNawar
author_rank: Newbie
timestamp: April 01, 2019, 01:41:25 pm
content: I want to know what's the difference between these wires,like what are they called and what each of them is used for and such details

author: Moriambar
author_rank: Unknown
timestamp: April 01, 2019, 02:01:31 pm
content: The first is called "solid core". The second is "stranded".The first is very useful for breadboards and perfboard prototyping because it's more "rigid" and can be easily bent in 90° or any angle. really useful to keep it tidy.I expect its strength to be inferior to the stranded one (because bending it too many times could break the core inside, but don't quote me on this.The stranded wire is more flexible and I think more resistent

author: Deepak
author_rank: Regular Contributor
timestamp: April 01, 2019, 02:26:44 pm
content: This smells an awful lot like a homework assignment to me...What exactly is driving your interest in these wires? What are you trying to accomplish?

author: vNawar
author_rank: Newbie
timestamp: April 01, 2019, 03:45:40 pm
content: I'm trying to fix my 2dshttps://www.eevblog.com/forum/repair/can-you-fix-a-very-small-pad-on-a-pcb/msg2303469/#msg2303469from this video I found out I don't need to fix the pads, I just need some wiresI searched for wires and found different typesso here I am wanting to know what's the difference between them so I can decide which one to use

author: JugglingElectrons
author_rank: Contributor
timestamp: April 01, 2019, 04:27:42 pm
content: You should be able to use solid core or stranded wires. It will be mostly up to your own preference.I prefer solid core due to how easy it is to bend it in the shapes you need.Stranded will be just as good and I'd guess that's what wiring they'd use when it was first built. Since the wires will not be subject to bending and additional stress, you probably don't need the extra resilience of stranded. You won't be bending the solid core enough to break.

author: Nusa
author_rank: Super Contributor
timestamp: April 01, 2019, 07:24:41 pm
content: For the kind of repair you're trying to do, solid core will be the better choice. In a pretty small wire size.But you'll also need a soldering iron, solder, and some practice using it before you attempt repairs on something you care about.

author: TimFox
author_rank: Super Contributor
timestamp: April 01, 2019, 08:41:28 pm
content: Stranded is much better if the wires will move, bend, or flex in service. However, you must be careful lest any stray strands work free from the bundle and touch something else. It is also required for crimped connections.Solid is great for holding its bent shape, so long as the wire stays stationary.
What's the difference of two Zener diode series (MMBZ52 and BZX84)? - Page 1
Forum section: electronics / beginners

author: Rabbitoose
author_rank: Contributor
timestamp: January 26, 2023, 01:39:34 am
content: Hi,I'm a newbie.I found the two series of Zener diodes are very similar and looks can be replaceable to each other, so I wonder why the manufactor made both of them.They are similar in the following features (onsemi for example):1. SOT-23 package2. BZX84 has both 5% tolerance and 2%, but MMBZ52 has only 5% (?), but currently 5% is enough to me.3. Zener voltage range, MMBZ52 is 2.4V-91V, BZX84 is 2.4V-75V, not a big difference.4. same ESD rating5. different IZK (IZT) current? There is not much about it in the datasheet.6. different impedance, also has no big difference.7. BZX84 has part type of 6V Zener voltage, but MMBZ52 has no.8. Power dissipation, MMBZ52 225mW, BZX84 250mW.I usually use Zener diodes to protect MOSFET, etc., so I feel both series can be used, but now I can't decide which series to buy.Is there a historic reason, or American/European naming convention, or different qualified standards?Can anybody help me out?Thank you!

author: Tomorokoshi
author_rank: Super Contributor
timestamp: January 26, 2023, 02:38:42 am
content: Different historical series by different manufacturers that over time, due to cloning, mergers, spinoffs, etc. show up as similar but not identical parts. Which manufacturer are you reviewing that makes both? Do you have links to datasheets?

author: Rabbitoose
author_rank: Contributor
timestamp: January 26, 2023, 02:45:09 am
content: Quote from: Tomorokoshi on January 26, 2023, 02:38:42 amThank you.Onsemi BZX84: 250 mW; Zener Diode Voltage Regulatorhttps://www.onsemi.com/products/discrete-power-modules/zener-diodes/bzx84Onsem MMBZ52: 225 mW; 5% Zener Diode Voltage Regulatorhttps://www.onsemi.com/products/discrete-power-modules/zener-diodes/mmbz52

author: Tomorokoshi
author_rank: Super Contributor
timestamp: January 26, 2023, 03:03:39 am
content: Quote from: Rabbitoose on January 26, 2023, 02:45:09 amThe MMBZ52 series is an old Fairchild line, which is now part of onsemi. Motorola had both the MMBZ52 and BZX84 lines since at least 1994. Either is probably fine in your application. It seems the BZX84 series is more completely defined. You may need to test both in your application to determine the best performance.

author: Rabbitoose
author_rank: Contributor
timestamp: January 26, 2023, 03:18:54 am
content: Quote from: Tomorokoshi on January 26, 2023, 03:03:39 amThank you for the accurate information.I often get confused because I know little about the history of the electronics industry.Your answers have given me a clear direction.
What's the most efficient power conditioner? - Page 1
Forum section: electronics / beginners

author: Deactivated-1
author_rank: Frequent Contributor
timestamp: August 06, 2023, 05:06:26 am
content: My neighbor has recently bought the Buzz-O-Matic Supra-Square Wave-Buster 9000 furnace fan motor that manages to f up the mains so much that it's literally impossible to record any audio.And my electrical company doesn't care.So since I need a power conditioner to be running all the time because of that crap, what's the most efficient power conditioner? Are the switch mode ones ok when it comes to interference from themselves?

author: Psi
author_rank: Super Contributor
timestamp: August 06, 2023, 05:30:28 am
content: A power conditioner for an entire house or just your PC?Best for your PC or workroom is probably an online or double conversion type UPS.
Whats the name of the well tip for Hakko Fx888 and where can I buy it in aus? - Page 1
Forum section: electronics / beginners

author: Mint.
author_rank: Frequent Contributor
timestamp: March 31, 2013, 12:56:19 am
content: I need the well tip for soldering SMT components.

author: David_AVD
author_rank: Super Contributor
timestamp: March 31, 2013, 01:02:38 am
content: With my Hakko 936, I use a standard conical tip for 0805 and SOIC packages. The FX888 has a similar standard tip I think.

author: olsenn
author_rank: Frequent Contributor
timestamp: March 31, 2013, 01:06:28 am
content: I just use the default tip and some solder braid to solder SM packages; I find it works well

author: IanB
author_rank: Super Contributor
timestamp: March 31, 2013, 01:45:06 am
content: You don'tneedthe well tip. It's just one of many possibilities. Watch the Hakko soldering videos online for illustrations of how to use other tips.