hybridfree/eevblog-posts huggingface dataset:
Help identifying this chip - Page 1
Forum section: electronics / beginners

author: hugman96
author_rank: Newbie
timestamp: September 22, 2025, 03:20:29 pm
content: Does anyone know this chip?Its used in this audio recorder:https://www.aliexpress.com/item/1005008763369655.html?spm=a2g0o.productlist.main.1.852137acHkJsuE&algo_pvid=7da7ad15-b1a1-4c4d-b3b1-352ad95885b4&algo_exp_id=7da7ad15-b1a1-4c4d-b3b1-352ad95885b4-0&pdp_ext_f=%7B%22order%22%3A%2219%22%2C%22eval%22%3A%221%22%2C%22fromPage%22%3A%22search%22%7D&pdp_npi=6%40dis%21EUR%2110.18%219.64%21%21%2183.48%2179.02%21%40211b6a7a17582280430713471e800b%2112000046565219760%21sea%21EE%210%21ABX%211%210%21n_tag%3A-29910%3Bd%3A794d1d66%3Bm03_new_user%3A-29895&curPageLogUid=xt867r0V9gDe&utparam-url=scene%3Asearch%7Cquery_from%3A%7Cx_object_id%3A1005008763369655%7C_p_origin_prod%3AI haven't been able to find the datasheet. When searching the code, it comes up this:https://www.janrichip.com/SOP16-Decoding-MP3-Player-IC-Chip-p.htmlBut that page seems strange because nothing is said about recording. So perhaps it's not the same at all. Could it be a Chinese copy of some other chip?I tested the recording behavior of that recorder module and it records up to the fat32 file size limit and then starts overwriting the same file without saving. Not super useful if 32GB SDcards are supported. Was wondering if it could be reprogrammed to do automatic saves. But again, very little information available. Perhaps someone has more experience with those chips.

author: amyk
author_rank: Super Contributor
timestamp: September 23, 2025, 01:27:46 am
content: What pinout does it have?It could be a remarked JieLi (JL) MCU.

author: fzabkar
author_rank: Super Contributor
timestamp: September 23, 2025, 05:08:56 am
content: Quote from: amyk on September 23, 2025, 01:27:46 amThe pinout is in the OP's link:https://www.janrichip.com/SOP16-Decoding-MP3-Player-IC-Chip-p.html

author: amyk
author_rank: Super Contributor
timestamp: September 24, 2025, 01:42:12 am
content: It could be AC109N/AC1082, see here:https://kagaimiq.github.io/jielie/chips/pinout-diagrams/

author: fzabkar
author_rank: Super Contributor
timestamp: September 24, 2025, 06:52:44 am
content: http://www.yunthinker.com/static/upload/file/20250103/1735890160504919.pdf(AC1082 short datasheet)

author: hugman96
author_rank: Newbie
timestamp: September 25, 2025, 04:46:59 pm
content: That AC1082 could fit the bill. It has a MIC input pin necessary for recording and plenty of IO to implement battery charging. But sadly it is OTP then.But based on the features available, could automatic file saving theoretically be implemented? By monitoring file size or roughly measuring recording time from the internal oscillator perhaps?
Help identifying this component (very deep mid mount usb c female) - Page 1
Forum section: electronics / beginners

author: eigenvektor
author_rank: Contributor
timestamp: October 31, 2023, 09:21:44 pm
content: Hi all,I need to mount a usb c female connector as low as possible on my board. Was thinking of doing a tht connector on the other side of my board, but that would mean I'd have components on both sides of the PCB which would increase assembly costs quite a bit. Then I found this on aliexpress, but no model number and no idea where to source in large quantities.Apparently it's used on the Iplay 40 and certain blackview models.Any leads on how I would search for this?

author: DavidAlfa
author_rank: Super Contributor
timestamp: October 31, 2023, 09:28:25 pm
content: It seems they're called "mid mount" connectors.https://www.mouser.es/new/gct/gct-usb-3-0-type-c-connectors/

author: tooki
author_rank: Super Contributor
timestamp: October 31, 2023, 09:45:55 pm
content: Well, mid-mount ones center the plug along the PCB; the OP’s ones seem to be taken to the extreme edge.With that said, I found a number of them on Digi-Key that seem reeeeally close. Some Molex, some CNC Tech, some JAE, and others. M

author: eigenvektor
author_rank: Contributor
timestamp: October 31, 2023, 09:54:39 pm
content: indeed, I'm using a 1.6mm mid-mount connector and it's not low enough.

author: eigenvektor
author_rank: Contributor
timestamp: October 31, 2023, 10:06:43 pm
content: Very sorry to bother, but could you post the links by chance? Best I can find on digikey are the 2.1mm mid-mount ones.btw cool to see somebody else from Switzerland :P

author: DavidAlfa
author_rank: Super Contributor
timestamp: October 31, 2023, 10:48:02 pm
content: They're called like that, of course there're different depths.Farnell, etc, also use "mid-mount" term.In lcsc they're called "sink board".This one is not totally flat, but quite deep:https://www.lcsc.com/product-detail/USB-Connectors_HOOYA-USB-310CB_C309373.html

author: eigenvektor
author_rank: Contributor
timestamp: October 31, 2023, 10:55:49 pm
content: If you have a look at the post title I'm aware that these are called mid mount, but searching for mid mount only gives 0.8 and 1.6mm (they're flat to the bottom board edge, not centered), as well as 2.1mm. The connector in my picture is even deeper than 2.1mm, as well as having 12 pins which is perfect for me, and I wasn't able to find a 12 pin 2.1mm mid mount.

author: eigenvektor
author_rank: Contributor
timestamp: November 27, 2023, 05:22:52 pm
content: If anybody stumbles upon this thread in the future: turns out it's not so deep mount after all. The pin placement, and the front hooks prevent the rear hooks, which are flush with the connector, from sitting flush with the PCB. So seems that there is not much difference between this and a 2.4mm mid mount.One example from LCSC: Yuandi TYPE-610-2.4-T3-5A
Help identifying this component. - Page 1
Forum section: electronics / beginners

author: Queb
author_rank: Newbie
timestamp: August 24, 2013, 10:23:24 am
content: Hi all,I picked up a cheap dead satellite box which was broken.I replaced the 3.3v reg and diode which fixed the boxes no boot issue (first time reworking smd !)Now I have found the input to the inductors on the tuning board is only 12v and not the 13.2 or so volts it requires.After probing around the board I found that it traces back to this SOT23-6 part .. but what is it ? I has a input of 12 volts and 12 volts out...And a transistor is also nearby, thanks for any help

author: Psi
author_rank: Super Contributor
timestamp: August 24, 2013, 10:31:35 am
content: The way its connected says mosfet or transistor.4 thick connections (heatsink and drain or source)1 thick connection (drain or source)1 thin connection (gate)

author: Queb
author_rank: Newbie
timestamp: August 24, 2013, 11:11:45 am
content: Theres 1.1 volts on one pin and 12.2 volts on another ... 12.2 volts output on all 4 output pins ...I think this should be making 13.2 volts or am I barking up the wrong tree ?

author: ablacon64
author_rank: Frequent Contributor
timestamp: August 24, 2013, 02:36:08 pm
content: It seems ok to me. Pin 1 is marked by the arrow, the other must be counted counterclockwise. Which is 1.1V? I guess it's pin 3, the thin one.Just check if there is not short between 4 and 5.

author: mianchen
author_rank: Regular Contributor
timestamp: August 24, 2013, 02:42:17 pm
content: Could it be one of these?http://pdf.datasheetcatalog.com/datasheet/toshiba/1202.pdf
Help identifying this connector - Page 1
Forum section: electronics / beginners

author: jimmyc_
author_rank: Contributor
timestamp: July 30, 2021, 04:09:11 pm
content: Hello chaps! Glad to have found this forum - I need help identifying this connector.

author: syzygy
author_rank: Contributor
timestamp: July 30, 2021, 04:38:14 pm
content: Four sets of 2 pins suggest twisted pair - it could be a circular "ruggedized" ethernet connector. Check LEMO or Turck - they have similar patterns (a sort of square-pattern) in M8 or M12 shells, but most have divided sections - likely for keying. Maybe check Switchcraft or L-Com?Edit - kind of resembles Yamaichi Germany as well (but not exactly, and they really just resemble LEMO, in my opinion)

author: syzygy
author_rank: Contributor
timestamp: July 30, 2021, 04:47:25 pm
content: Yamaichi:Also - here is a comparison of a few ethernet connectors for harsh use:https://www.gore.com/sites/g/files/ypyipe116/files/2017-01/Designing%20Ethernet%20Interconnect%20for%20High-Speed%20Data%20Transmission%20-%20White%20Paper%20-%20Military%20-%20111816.pdf

author: jimmyc_
author_rank: Contributor
timestamp: July 31, 2021, 04:29:20 pm
content: Great! Thanks guys!

author: jimmyc_
author_rank: Contributor
timestamp: July 31, 2021, 04:35:10 pm
content: Any ideas about making a mould for the other male side of this connector? Does Friendly Plastic help? I wouldn't want this side of connector to get wet and rust.
Help identifying this part M34AF - Page 1
Forum section: electronics / beginners

author: mr.fabe
author_rank: Regular Contributor
timestamp: April 10, 2021, 12:28:48 am
content: Hello,I am having trouble locating a datasheet for this part. Any help would be appreciated.Thank you!

author: ledtester
author_rank: Super Contributor
timestamp: April 10, 2021, 12:32:40 am
content: My guess it's a LPC662 -- IN = industrial temperature rangehttps://www.ti.com/lit/ds/symlink/lpc662.pdf
Help identifying this resistor array looking component (Part 2) - Page 1
Forum section: electronics / beginners

author: brandon.arnold
author_rank: Contributor
timestamp: December 08, 2024, 06:38:59 pm
content: I am trying to understand (a) where capacitors might be, or (b) any part documentation for a similar part historically to this one, for an RC network on this board (see photo 1). The package is SIP-14 and has manufacturer label RE9511. On the PCB, it has a mask label "RCF" which I believe means "RC Filter."Photo 2 shows symbols I made in KiCAD for these parts, that should explain my theory of how they are put together, with resistor values. Basically, pin 1 is +5V, pin 14 is GND, and each pair of pins (2-3, 4-5, 6-7, 8-9, 10-11, and 12-13) have a relation to each other that I have simplified in photo 3. The way I came to these conclusions is by measuring the resistance between any two pins. For example, across pins 2-14 would read 6 k-Ohm, across pins 1-2 would read 4.5 k-Ohm, across pins 1-3 would read 4.75 k-Ohm, and across pins 3-14 would read 6.25 k-Ohm.I measured very small capacitance between any two pins, which made it hard to work out the capacitive part of this circuit. But I believe the purpose of a capacitor in this system is to debounce, because this is an input from push buttons into a bus interface.Can anyone suggest a theory where a capacitor would go in this system? Would it go across the 250 Ohm resistor, the 1.5 k-Ohm resistor, or the 4.5 k-Ohm resistors? I feel like any would work, but it is annoying that I can't find any part on the internet that is anything like this.Thank you!

author: jwet
author_rank: Frequent Contributor
timestamp: December 09, 2024, 01:27:20 am
content: I don't know what capacitance you're seeing but a SIP network like this in circuit might have 5 pF of iust parasitic C. This is like just a terminator with two R's, any C is a parasitic.You can measure the C if its higher by removing a part and running a sig gen through to see what it is but I suspect that is just R's.

author: brandon.arnold
author_rank: Contributor
timestamp: December 09, 2024, 04:14:39 pm
content: Quote from: jwet on December 09, 2024, 01:27:20 amThis makes sense! Yes, 5 pF is something like what I could measure with my meter. I don't think I measured any capacitance greater than that. So you are probably right that my description above is the entire circuit, or close to it.
Help identifying this resistor array looking component - Page 1
Forum section: electronics / beginners

author: brandon.arnold
author_rank: Contributor
timestamp: December 03, 2024, 04:47:18 pm
content: Edit: I've updated a few things below with comments I made, after more study. Ignore the second photo (of the diagram).Hi all. Can anyone venture to guess what may be the structure of this component (see photo 1)? The package reminds me of a resistor array / network, and with the exception of pin 1, it behaves like a 6k-Ohm one. Other resistor arrays on this PCB are prefixed "RA," however, whereas this one is prefixed "U" which is always designated for ICs.It is a single inline package (SIP-14) labeled "RE9511". Aside from their "U..." reference designators on the PCB, there is a mask label "RCF".Pin 14 is connected to GND, Pin 1 is connected to VCC. Measure resistance between any pin 2-13 and GND (pin 14) is 6k-Ohm; between any pin 2-13 and VCC is 4.7k-Ohm. Between pin 1 and 14 measures 1k-Ohm. And between any pair of pins (2-3, 4-5, 6-7, 8-9, 10-11, 12-13) measures 220-Ohm. I was not able to pick up any capacitance measurement in place, across any two pins.

author: tszaboo
author_rank: Super Contributor
timestamp: December 03, 2024, 05:13:48 pm
content: Probably a parallel bus pullup resistor. It was common before SMT resistors become 0.1 cent in price.

author: brandon.arnold
author_rank: Contributor
timestamp: December 03, 2024, 05:23:58 pm
content: Thanks for chiming in, @tszaboo. I noticed RCF could mean RC Filter, too? After waiting a little while, I do pick up a measurement of ~6 mF between any pin and ground.

author: coromonadalix
author_rank: Super Contributor
timestamp: December 03, 2024, 05:30:18 pm
content: the measurements could be affected by nearby pieces ... the best would be to desolder one and recheck
Help identifying this simple DC power connector - Page 1
Forum section: electronics / beginners

author: danielbriggs
author_rank: Regular Contributor
timestamp: October 15, 2019, 10:59:17 am
content: Hi there,Sorry for this basic question, but can anyone help me identify this connector?The PSU has died, so trying to source a replacement. Worst case I just cut the plug off and crimp it on a new similar PSU, but if it's a common thing that can be bought complete, any ideas?
Help Identifying to39 transistor...private labeled. - Page 1
Forum section: electronics / beginners

author: Davetheampguy
author_rank: Newbie
timestamp: May 17, 2018, 06:40:11 pm
content: Long shot. Working on a Rivera Sedona Lite acoustic tube amp. Second channel is out. Signal traced second channel and foundshorted transistor..the first one in the channel. Easy fix...if I can ID the transistor. to39 i think.Says Rivera 104-010 0745. Guess its a jfet? I have scoured for a schematic. q103 on the circuit board.Please help. Have had no response from Rivera.

author: strawberry
author_rank: Super Contributor
timestamp: May 17, 2018, 07:13:55 pm
content: Any JFET should work if DC values are close enoughPull out values from schematic easyJ104 (2SJ104)
Help identifying / understanding this surface mount crystal - Page 1
Forum section: electronics / beginners

author: brandon.arnold
author_rank: Contributor
timestamp: November 13, 2024, 03:07:45 am
content: Hi all! The component in the photo is labeled X651. Compared to other smt resistors and capacitors it's on the larger side, something like 2512, measuring around 7mm x 3mm. It must be a crystal because both ends are connected to two crystal/clock pins on a microcontroller. The label on it is "500 (M) g" where "(M)" is like a M shape with a circle around it. The middle is connected to ground.Can anyone say what the value of this crystal is, and how it might work?

author: wraper
author_rank: Unknown
timestamp: November 13, 2024, 03:11:59 am
content: It's ceramic resonator, not crystal. Maybe marking actually is 5.00?

author: brandon.arnold
author_rank: Contributor
timestamp: November 13, 2024, 03:52:34 am
content: Thank you so much! Yeah, I can see other examples now. That's exactly it.

author: Ian.M
author_rank: Super Contributor
timestamp: November 13, 2024, 05:36:22 am
content: Most crystal oscillator circuits in MCUs and similar ICs use the crystal in a configuration known as aPierce oscillator, which requires two low value capacitors to ground, on each terminal of the crystal, which act as a capacitive divider effectively forming a tap on the equivalent resonant circuit of the crystal. This forces the waveform on the undriven end of the crystal to be antiphase to the driven end, providing 180° phase shift (at resonance), which together with the inverting amplifier in the IC, adds up to 360° (0°) phase shift, satisfyingBarkhausen's criterionfor oscillation.A ceramic resonator can be constructed with a physical tap electrode, so doesn't need external capacitors to get 180° phase shift for a Pierce style oscillator circuit.Therefore once you have identified a two pin Piece style oscillator circuit in an IC, the presence of load capacitors indicates a crystal (usually in a two or four pin package) and their absence and a three pin package, with one pin grounded, a ceramic resonator.Note that the capacitors are effectively in series from the 'point of view' of the crystal, so their value will be a bit less than double the nominal load capacitance in the crystal's datasheet, the rest being made up by the stray capacitances of the tracks, IC package pins etc. It is possible to integrate *small* capacitors in the IC, so low power low frequency crystals (e.g. 32.768 kHz 'watch' crystals in RTC circuits) may not have any externally visible load capacitors.

author: brandon.arnold
author_rank: Contributor
timestamp: November 16, 2024, 07:25:08 pm
content: Super informative. THANK YOU.
Help identifying what opto isolator is being used in the schematic  - Page 1
Forum section: electronics / beginners

author: NoSkillz
author_rank: Newbie
timestamp: September 11, 2019, 02:44:59 am
content: Hello and thank for taking the time to read this. I started building this open source cm3 module handheld. I ordered the boards and all the ics and passives and didn’t notice that the opto isolator was not labeled. I’m very new to electronics. But i have searched and read a lot on the subject and i think that a pc814 might work. But I wanted to see if any of you guy might no a better one to use? and the pictures that are posted up of the device are super blurry so i can’t make out the numbers on the chip and again thanks for your time .

author: ledtester
author_rank: Super Contributor
timestamp: September 11, 2019, 04:12:50 am
content: In my _expert_ opinion I don't think the choice of optocoupler matters much here - I think pretty much any device with a compatible footprint will work.Here's the internal schematic of the PC814:The back-to-back diodes on the input means it is designed for AC signals - not for a DC control signal that your schematic shows. That said, I would hazard to guess that the PC814 in all likelihood will work fine in this circuit.I would try any one of the 4-pin optocouplers on this page specified for DC input:https://www.jameco.com/shop/keyword=Optocoupler-4-PinSince you already have a pcb, just make sure the pinout and footprint match.The hackaday.io project seems to be here:https://hackaday.io/project/94791-retro-cm3-a-powerful-retropie-handled-game-consolIf anyone has Altium there is a PCBDOC file available there. Perhaps it has a BOM?Update: Just noticed from the photos that the board uses SMD components. So it would be a good idea to get the footprint and pin assignments from the PCBDOC file.

author: ledtester
author_rank: Super Contributor
timestamp: September 11, 2019, 04:31:42 am
content: Well, I did find a BOM in this repo:https://github.com/Dean-Chu/Retro-CM3It's an Excel file:https://github.com/Dean-Chu/Retro-CM3/blob/master/Retro-CM3_HW/Retropie-BOM.xlsxHowever, it doesn't seem to include any opto-couplers.

author: NoSkillz
author_rank: Newbie
timestamp: September 11, 2019, 04:41:31 am
content: yes the repo is a updated version i already had all the part for the first version thanks for looking tho
Help identifying what type of power supply I have? - Page 1
Forum section: electronics / beginners

author: gavztheouch
author_rank: Newbie
timestamp: February 13, 2014, 02:32:53 pm
content: Hi guys,I recently bought some metal electrical enclosures at auction for a cnc milling machine project I had in mind. I was expecting them to be empty but I found some goodies inside, there was one box however that has me stumped as to what it contains. Here are some photos for reference.It looks like some sort of switching power supply?Any ideas as to what it is used for and can I use it as a bench power supply?CheersGAvin

author: gavztheouch
author_rank: Newbie
timestamp: February 18, 2014, 07:34:00 pm
content: Why would you need to have a fibre optic in and out port on a PSU? Would this be controlled with an external computer?

author: babysitter
author_rank: Frequent Contributor
timestamp: February 18, 2014, 07:46:13 pm
content: Re fiber optics: Some Ericsson GSM BTS PSU have fiberoptic connectors,and they dont care if you connect nothing.

author: peter.mitchell
author_rank: Super Contributor
timestamp: February 19, 2014, 07:24:25 am
content: I get the feeling that this is for HV, either monitoring or control... Fiber provides excellent galvanic isolation.

author: Fabiusp98
author_rank: Contributor
timestamp: February 19, 2014, 09:11:54 am
content: I found this, maybe it's related:http://www.nsn-now.com/Indexing/ViewDetail.aspx?QString=6130998563989I also found the manufacturer website:http://www.alstom.com/Since it's an italian company I could help with the language since I'm italian.

author: ciccio
author_rank: Frequent Contributor
timestamp: February 23, 2014, 12:50:15 pm
content: Quote from: Fabiusp98 on February 19, 2014, 09:11:54 amSorry Fabiusp98, Alstom is a multinational corporation.They bought SABIEM years ago, so they have a manufacturing branch here in Italy, where they build railroad equipment.For what I see, the boards in the photographs are not made in Italy. Maybe it was used in a wind generator...
Help identiying SMD part - JWBU 132Q - Page 1
Forum section: electronics / beginners

author: WaveyDipole
author_rank: Frequent Contributor
timestamp: August 26, 2017, 06:28:03 pm
content: I need some help identifying an SMD transistor part. It is marked:JWBU132QThe package is a 3 legged maybe 3-4mm length 'transistor' like package although it may, of course, be something else. Its in the circuit of a DC to DC converter designed to light a small 3W LED array. I haven't been able to find it in any online references so far, although I can't imagine it being anything particularly unusual.There is a BU132, although those come in a TO-3 package and I can't imaging this beeing beefy enough to compare. I also came across a U132 'unijunction programmable transistor', although not with the JWB prefix.
Help identifying a chip. - Page 1
Forum section: electronics / beginners

author: Ketkutin
author_rank: Newbie
timestamp: May 13, 2014, 05:12:24 pm
content: Hello,I am having a quite a hard time trying to identify this chip.Here is a few pictures i took with macro lens.The chip in question is in a car camera, and it's function most likely is to manage the battery charging and discharging. Since there is 32 pins, it also has other stuff to do in the power supply business. It does not like over 5 V, as you can see. It is driven by USB and/or a 1-cell LIPO. There are 3 inductors in the surroundings of the chip, and a bunch of ceremic capacitors.And the camera is Mobius action camera, which i burned during so RC experiments.All help is appreciated. And the rough size of it is ~5 mm * 5 mm.
Help IDing Components - Page 1
Forum section: electronics / beginners

author: mentaldemise
author_rank: Regular Contributor
timestamp: March 03, 2015, 04:04:41 am
content: I bought a "Grab Bag" of parts. I think the left-most here are just radial caps. The middle and right, I have no idea. Any ideas?

author: w2aew
author_rank: Super Contributor
timestamp: March 03, 2015, 04:17:35 am
content: My guess would be a resistor network and a bridge rectifier.

author: eejake52
author_rank: Contributor
timestamp: March 03, 2015, 04:55:19 pm
content: The items on the left have a slight conical shape on one end; so they might be diodes. A quick check with an ohm meter will clarify.

author: German_EE
author_rank: Super Contributor
timestamp: March 03, 2015, 05:53:41 pm
content: Small capacitors, probably about 100nF, a resistor network and an opto-isolator used in a switched mode power supply. That last item could be a bridge rectifier though.

author: SeanB
author_rank: Super Contributor
timestamp: March 03, 2015, 06:22:27 pm
content: Dipped leaded ceramic chip capacitors. Likely 100nF 50V X5R ceramic. The middle is a 330 ohm thick film resistor network. Either a common with 7 resistors connected to it, or 4 individual resistors at adjacent pins, though with the custom leadframe it might be a combination of them. Right is a common bridge rectifier.

author: mentaldemise
author_rank: Regular Contributor
timestamp: March 03, 2015, 06:48:41 pm
content: Thanks guys! Do they make caps like the middle package? I can't get a resistance reading on them, but when I hook them up to my DIY meter it's showing 150pF on any two pins.Also, bridge rectifier good for anything but AC -> DC? I'm thinking I'll stay away from mains for now.

author: PA0PBZ
author_rank: Super Contributor
timestamp: March 03, 2015, 07:45:45 pm
content: Quote from: mentaldemise on March 03, 2015, 06:48:41 pm331 could be 330pF, if you take 2 random pins you probably have 2 in series -> 150pF. Try to find the common, should be at the end.
Help IDing/ Replacing capacitor - Page 1
Forum section: electronics / beginners

author: OmegaPoint
author_rank: Newbie
timestamp: February 08, 2015, 06:38:04 pm
content: Hi there. I'm currently working on a portable Gamecube and while stripping connectors off the board, I accidentaly ripped a capacitor off. I think it's used for audio. Unfortunately one of the pins came off with it, so I need to get a new one - can anyone help me find a replacement? It's an aluminium type with the codeV2P3325vI have attached a picture of the little guy.Thanks!

author: SeanB
author_rank: Super Contributor
timestamp: February 08, 2015, 06:44:28 pm
content: 33uF 25V.

author: OmegaPoint
author_rank: Newbie
timestamp: February 08, 2015, 07:50:55 pm
content: Thanks - is the 'V2P'not relevant?
Help IDing this board - Page 1
Forum section: electronics / beginners

author: The_Welding_Library_Guy
author_rank: Contributor
timestamp: February 10, 2019, 02:52:43 am
content: I'm in the process of building up a decent electronics shop that I can just walk into after to work and get right to projects with out always waiting for parts to come in the post. To help in this im working on getting a wide ranging competent collection and so i bought a box of random parts and bits from ebay. While going through it I found this little board. I hooked 5v to it and nothing happened. following the traces on the back it looks like the power comes in straight from the pins to the chip with only a ceramic cap in between the chip and neg pin.

author: ataradov
author_rank: Super Contributor
timestamp: February 10, 2019, 03:11:22 am
content: This is a unipolar stepper motor driver board. It comes with those cheapo stepper motors with gear boxes.Here are some for salehttps://www.ebay.com/itm/DC-5V-Stepper-Motor-28BYJ-48-ULN2003-Driver-Test-Module-Board-fit-for-Arduino/264004483327
Help ID'ing this connector? + Breakout board for it? - Page 1
Forum section: electronics / beginners

author: danielbriggs
author_rank: Regular Contributor
timestamp: January 15, 2019, 06:21:50 pm
content: Hi all,Can anyone help me identify this tiny connector?I've measured it to 0.4mm pitch.The black plastic part is 2.00 x 5.35mm24x way.I need to put some test signals in and out of it... any ideas to an off the shelf breakout board for a mating connector? Or to convert to something at least more hackable and probable?All the best,Dan

author: Cyril.Anthony
author_rank: Contributor
timestamp: January 15, 2019, 06:35:46 pm
content: looks like molex slimstack connectors

author: danielbriggs
author_rank: Regular Contributor
timestamp: January 15, 2019, 06:56:39 pm
content: Thanks for the pointers - I'll keep looking and remeasure.It's definitely 0.4mm pitch.

author: Cyril.Anthony
author_rank: Contributor
timestamp: January 15, 2019, 07:05:34 pm
content: http://www.jst-mfg.com/product/pdf/eng/eJAK.pdf24P-JAKK-GSAN-TF
help improving my circuit - Page 1
Forum section: electronics / beginners

author: samsamm777
author_rank: Contributor
timestamp: October 21, 2021, 06:47:00 pm
content: Hey! I'm pretty newbie to electrical engineering, and this is very much my hobby. So please be gentle. I've been working on a circuit to control a 5v PC case fan. To be used as a soldering smoke extractor. It runs of a single cell lipo battery, and can be charged via usb. I think im happy with my design with regards to the usb, charging and power regulation. However im really struggling with an approach to the fan speed control. Im using a 555 to drive a mosfet for the motor load, which im sure will work. However.. it just doesnt seem like the right solution. Im sure theres a pwm ic i can use which do the job for me, but im struggling to find something. Any advice would be much appreciated.

author: Benta
author_rank: Super Contributor
timestamp: October 21, 2021, 07:34:57 pm
content: Your schematic is pretty much unreadable, sorry.A couple of general comments:1: 5 V PC fans are almost all brushless DC motor powered with integrated controllers.2: 2-wire 5 V PC fans should be controlled by a relatively low frequency PWM, eg, 100 Hz. You're turning on and off the controller all the time.3: using a modern 4-wire PC fan is much easier. You just need to provide a 25 kHz PWM signal on a separate pin.Price wise I see no major difference today.

author: samsamm777
author_rank: Contributor
timestamp: October 21, 2021, 07:56:07 pm
content: Quote from: Benta on October 21, 2021, 07:34:57 pmWould you mind possibly elaborating on why its unreadable? I've tried to separate all the logical blocks to keep things tidy.

author: Benta
author_rank: Super Contributor
timestamp: October 21, 2021, 08:00:17 pm
content: Quote from: samsamm777 on October 21, 2021, 07:56:07 pmMy apologies. Somehow the "zoom" function didn't work in my browser. A restart fixed that.
help in building an ignition pick up - Page 1
Forum section: electronics / beginners

author: ironclad
author_rank: Newbie
timestamp: March 22, 2012, 09:57:35 pm
content: I have been using my two old analog oscilloscopes for diagnosing car engine running faults,with a standard 10x probe successfully.Now I'm going to have a go at analyzing the spark plug ht waveform by attaching a pick up to the spark plug lead,these pick ups can be bought commercially but are a bit expensive just for hobby use.Any one got any ideas on the building of a spark plug ht pick up,for oscilloscope connectioncheersIan

author: NiHaoMike
author_rank: Super Contributor
timestamp: March 23, 2012, 05:15:48 am
content: Just hold the probe near (a few inches away) the spark plug wire. The exact voltage is not very important, just the general shape. Or scope the transformer primary, then do a ring test to make sure the transformer is good.

author: SeanB
author_rank: Super Contributor
timestamp: March 23, 2012, 03:15:35 pm
content: Old method was to take a wooden clothes peg, and place a small metal pad inside the peg, attached to the scope probe. you then simply clamped it on the plug wire you are interested in, and it makes a very high ration capacitive divider. Not easy to calibrate, but in most cases you are really looking for variations from cylinder to cylinder.
Help in finding this JTAG adapter board for Nallatech 385N card - Page 1
Forum section: electronics / beginners

author: TREX24
author_rank: Newbie
timestamp: January 17, 2023, 07:15:12 am
content: Please help me in finding following Nallatech 385 JTAG adapter board which is used as intermediate to connect USB blaster-2 and Nallatech 385 board." alt="" class="bbc_img" />
Help in identifying a connector - Page 1
Forum section: electronics / beginners

author: stcoso
author_rank: Regular Contributor
timestamp: March 23, 2022, 06:13:13 pm
content: Hi!I need some help in identifying a 7-pin connector with bayonet... I'll attach some photos (and will gather additional info if necessary)Thanks in advance.

author: golden_labels
author_rank: Super Contributor
timestamp: March 23, 2022, 06:22:35 pm
content: Isn’t that a 7-pin DIN?

author: SmallCog
author_rank: Frequent Contributor
timestamp: March 23, 2022, 10:37:17 pm
content: Looks like one to mehttps://complete-electronics.com/0107-07-10107071Bayonets aren't super common on DIN's

author: tooki
author_rank: Super Contributor
timestamp: March 24, 2022, 01:56:53 pm
content: Bayonet DIN connectors are readily available from numerous manufacturers. These days, they’re arguably more common in the wild than the push-fit ones… (Threaded DIN is also available.)

author: Terry Bites
author_rank: Super Contributor
timestamp: March 24, 2022, 02:52:01 pm
content: Looks like a Lumberg 0107 din
help in identifying a part on a schematic - Page 1
Forum section: electronics / beginners

author: tryingtolearn
author_rank: Contributor
timestamp: October 29, 2024, 10:36:49 pm
content: in researching an ideal diode circuit with under/over voltage protection Ive been reading the data sheet on ltc4416-1https://www.digikey.com/en/products/detail/analog-devices-inc/LTC4416IMS-1-PBF/1620094curious as to the symbol boxed in greenwould it be 3 individual p channel mosfetsThe adjacent circuit has them marked Q1 Q2 Q3 Q4 so just wondering if it has a different meaning when not labeledTHanks for any info

author: TimFox
author_rank: Super Contributor
timestamp: October 29, 2024, 10:56:01 pm
content: Yes, three enhancement-mode MOSFETs.

author: tryingtolearn
author_rank: Contributor
timestamp: October 29, 2024, 11:00:18 pm
content: Thank you

author: David Hess
author_rank: Super Contributor
timestamp: October 29, 2024, 11:54:15 pm
content: It is just three p-channel MOSFETs in series. I do not know why they did not label them.

author: tryingtolearn
author_rank: Contributor
timestamp: October 30, 2024, 12:05:20 am
content: Thanks David,It just threw mw off - wasnt sure if it meant something different - Lots to decipher in that datasheet.
Help in identifying  the part number of an SMD component  - Page 1
Forum section: electronics / beginners

author: Z. Khalid
author_rank: Contributor
timestamp: August 27, 2025, 04:14:03 pm
content: Hi all,I need help to decode the SOT89-3 component with the marking codes LR81849 UW5.I searched the internet for about an hour, but unfortunately, I didn't find any results.Please refer to the attached files where I attached the component’s analogue signatures on the Tracker 2000.Thank you in advance!

author: gamalot
author_rank: Super Contributor
timestamp: August 27, 2025, 04:27:21 pm
content: LR8N8-Ghttps://ww1.microchip.com/downloads/en/DeviceDoc/20005399B.pdf
Help in recognition of a PCB component.   - Page 1
Forum section: electronics / beginners

author: seneka21
author_rank: Newbie
timestamp: December 18, 2021, 03:56:14 pm
content: I would be grateful if someone could help me in finding the specifications of the depicted PCB transformer.The only indication on it is "HX 5" and it comes from a 12V- 30A Switching Power Adapter.Thanks in AdvanceHave a nice day!

author: Terry Bites
author_rank: Super Contributor
timestamp: December 18, 2021, 05:18:19 pm
content: Even with the manufacturers details and the schematic it would be hard to characterise it.

author: Ian.M
author_rank: Super Contributor
timestamp: December 18, 2021, 06:21:20 pm
content: Its quite likely that 'HX5' only identifies the plastic bobbin its wound on. I notice two different wire diameters on the same side of the former, which rules out it being any sort of off-the-shelf isolated pulse transformer, so there is little doubt that it is fully custom wound to the specs of the PSU manufacturer.Reproducing it would be a PITA for anyone other than the OEM, as it would need to be totally deconstructed to determine exactly how its wound and what (and how many layers of) inter-winding insulation and margining is used, the ferrite characteristics and exact dimensions would need to be identified and matched to a commercially available core, and the thickness of the glue lines in the side and center limbs of the core would need to be measured to determine how its gapped.An engineer specializing in SMPSU magnetics design with a well equipped workshop would be able to reverse engineer specs for it with a few hours work, but unless you need hundreds or thousands of them, the cost would be prohibitive. Your best bet if you need to source this part for a repair, is to try to source the complete board, even not working, as most SMPSU faults not involving mechanical damage wont damage the transformers.
Help interpreting data sheet for DK700-710 panel meter  - Page 1
Forum section: electronics / beginners

author: codohundo
author_rank: Newbie
timestamp: July 15, 2016, 02:22:24 am
content: I was hoping someone could tell me if I'm interpreting this datasheet correctly, I've re-watched Dave's video RE meter counts so I think I've got it, but anyway from the datasheet:http://www.ctonindustries.com/PRODUCTINFO/DK700series.pdfIt's a 4.5 digit (+/- 19999 counts) meter with an accuracy of +/- (0.06% FS + 1 count)it has 3 ranges but the one of interest here is +/- 200.0mVHere's where I'm a bit unsure, if the scale is +/-200.0mV that would make me think a 2000 count, not a 20000 count, should I expect a precision of 0.1mV or a precision of 0.01mV? Were they just being sloppy with the decimal point?so, assuming 1 count is 0.1mV on this scalethen, I read the accuracy as +/- (200mV*0.0006 + 0.1mV) or +/- 0.112mVor, assuming 1 count is 0.01mV on this scalethen the accuracy would be 0.022mVI'm inclined to ignore the scale decimal place and trust the reported meter count, it is a pretty expensive part from a reputable supplier so +/-0.022mv isn't inconceivable.Anybody want to weigh in, either on my assumptions or my analysis?Thanks,Travis

author: rstofer
author_rank: Super Contributor
timestamp: July 15, 2016, 03:09:49 am
content: The datasheet says the input range is 200.0 mV but it doesn't say what the reading will be. I am of the opinion that it will fill up the display to 199.99 mV. I don't know if it will rescale to read x200.0 for the very last 0.01 mV or not. Usually what a number like 200 mV really means is 199.99

author: Paul Moir
author_rank: Frequent Contributor
timestamp: July 15, 2016, 04:29:25 am
content: It seems to me that the 2v and 20v ranges suffer from the same reporting (2.000V and 20.00V), so I think someone was just not careful. Digikey seems to think it's a 4.5 digit meter which means a little more to me. I think they sometimes check to make sure because I've seen corrected datasheets on Digikey while the manufacturer's was still wrong or incomplete.'Course you could ask either just to make sure. I'd want to know if I made it.
help: laptop webcam pinout? - Page 1
Forum section: electronics / beginners

author: Prime73
author_rank: Regular Contributor
timestamp: July 10, 2016, 01:55:08 am
content: Hello,after a most recent dumpster dive I got an old compaq precarious cq56 (it's seems to be dead and I was after the screen). it has a build in webcam and I thought that I can reuse it in some fun project. However can't figure out pinouts for the module. Here is a pic of the module itself and a power supply part of the laptop pcb. Obviously #4 and#5 are GND and #3 is VCC for the module. However I can't find any info on Y9ZT regulator or the image processor itself to figure out proper VCC voltage. Also not sure what interface it uses for data transfer.any help is appreciated.

author: LokiChaos
author_rank: Contributor
timestamp: July 10, 2016, 02:26:45 am
content: A good number the internal laptop webcams are just USB, a quick search of the laptop model seems to indicate it is, so it's powered with +5V.

author: Monkeh
author_rank: Super Contributor
timestamp: July 10, 2016, 04:45:29 am
content: Quote from: LokiChaos on July 10, 2016, 02:26:45 amNO!Just because it uses USB does not mean it takes 5V. It is internal to the device, it can run from any supply rail they see fit.E: And a very brief investigation instead of assumption reveals that U4 on the supplied photo is an LDO providing the camera module with a 3.9V supply. I suggest powering U4 to check that.

author: LokiChaos
author_rank: Contributor
timestamp: July 10, 2016, 05:28:40 am
content: Good to knowI've only ever encountered 5V on various internal USB devices, but I'll admit that is a sample size on the order of 10 (mostly Wifi modules)

author: Prime73
author_rank: Regular Contributor
timestamp: July 10, 2016, 02:23:57 pm
content: Quote from: Monkeh on July 10, 2016, 04:45:29 amthat's what I was thinking. however I can't find a data sheet for U4 and not sure about the best approach to power it without knowing its Vin max. most likely it should be ok at +5V though... but I wanna be sure

author: Monkeh
author_rank: Super Contributor
timestamp: July 10, 2016, 02:46:52 pm
content: The LDO is fed from 5V.I suggest searching for 'CQ56 schematic'.

author: Prime73
author_rank: Regular Contributor
timestamp: July 10, 2016, 02:56:37 pm
content: Quote from: Monkeh on July 10, 2016, 02:46:52 pmthanks! found it.

author: amyk
author_rank: Super Contributor
timestamp: July 10, 2016, 03:12:11 pm
content: Rightmost two pins are USB D+ and D-, it's obvious that they're being routed as a differential pair.
help learning a product - Page 1
Forum section: electronics / beginners

author: user1868
author_rank: Newbie
timestamp: July 15, 2020, 02:46:39 pm
content: hello,I am a locksmith and was wondering if I upload a picture of a product if someone can help me go through and analyze it? I am learning electronics and have read some web stuff and started the art of electronics.thanks

author: dcbrown73
author_rank: Regular Contributor
timestamp: July 15, 2020, 02:47:44 pm
content: You shouldn't ask to ask a question. You should just ask the question you actually want answered.
Help - Mail relay USA to UK - Page 1
Forum section: electronics / beginners

author: jayco242
author_rank: Contributor
timestamp: January 27, 2022, 06:56:30 pm
content: Hi all,I am trying to buy this item from a US ebay seller. It is the original software set for Motorola's DSP chips. The cost is only 25 dollars and the seller has already paid USPS postage. I have already contacted them but no response. Is anybody willing to work with me on this?http://www.ebay.co.uk/itm/265469288007ThanksJason

author: SmallCog
author_rank: Frequent Contributor
timestamp: January 27, 2022, 09:09:26 pm
content: Do you not have businesses that do this?Singapore Post (vpost) offer this to Australia from a bunch of different countries including the US and UK, not sure if they offer services between the US and UK thoughOtherwise there's businesses like this:https://www.stackry.com/en/parcel-forwarding-usa-uk

author: retiredfeline
author_rank: Frequent Contributor
timestamp: January 27, 2022, 09:50:42 pm
content: I'm pretty sure that parcel forwarder companies are a thing. Do a search.

author: tpfaff100
author_rank: Newbie
timestamp: January 07, 2024, 04:44:09 am
content: Did you ever receive it? Would be curious to see what's inside.
Help me about opamp amplifier ? - Page 1
Forum section: electronics / beginners

author: Nhan95
author_rank: Contributor
timestamp: May 22, 2015, 01:16:06 am
content: In this inverting amplifier opamp, Why do they add the resistor R3 = R1||R2 to the non-inverting input although It doesn't affect to the result of Vout = R2/R1 * Vin. Thanks

author: rs20
author_rank: Super Contributor
timestamp: May 22, 2015, 01:21:13 am
content: Explained here:TLDR: Because an actual, real-life op-amp has a small amount of current flowing at the inputs, which tends to be balanced between them. Having equal impedances at the input means these input currents cause an equal voltage drop, and so the effect on the output is nil.

author: w2aew
author_rank: Super Contributor
timestamp: May 22, 2015, 02:58:34 pm
content: Quote from: Nhan95 on May 22, 2015, 01:16:06 amTo provide fundamental cancellation of the input offset caused by the op amp's small input bias currents.
Help me build a power supply for this application - Page 1
Forum section: electronics / beginners

author: dog80
author_rank: Regular Contributor
timestamp: August 10, 2013, 02:35:52 pm
content: I have a device (remote controlled relay) that operates on 12VDC and consumes less than 70mA. At the place I am going to install it, all I have available is 13.5V AC @ 50Hz.My first though was to build a typical linear power supply with a full wave rectifier, a smoothing cap and a LM317 regulator. But just the bridge rectifier alone will drop the voltage to 12V, then there's no way to use a voltage regulator, even a low dropout one.Can I get away powering the device with just the bridge rectifier and a big enough smoothing cap?

author: AndrejaKo
author_rank: Frequent Contributor
timestamp: August 10, 2013, 02:50:01 pm
content: It seems to me that you forgot to take into account the effects of the smoothing capacitor or alternatively you have very low current output from the power supply.Basically, the peak voltage of that 13.5 power supply is going to be 13.5*sqrt(2), which gives us around 19 volts. Two diodes give us around 1.5 V, so the peak is 17.5 V. This gives us plenty of room for a 12 V regulator, unless you run the supply at its full output current. So what you can try out it to make a rectifier, place a big enough smoothing capacitor after it, make a dummy load from a 150 ohm resistor (make sure it's 1 W or higher!) and see the voltage you have on it once it's connected. If there's room for a regulator drop-out voltage, then use a regulator too.

author: dog80
author_rank: Regular Contributor
timestamp: August 10, 2013, 03:02:03 pm
content: Forgot about the sqrt2 multiplication.Then there's abolutely no problem with the power suply, I can include the LM317 allright

author: SeanB
author_rank: Super Contributor
timestamp: August 10, 2013, 03:07:14 pm
content: If it is a remote control relay most likely it already has a bridge rectifier and such, as most I meet are rated for operation from 12-24VDC or AC, and work well from 8V to 20VDC.
help me choose a decent smd rework station - Page 1
Forum section: electronics / beginners

author: elunico1989
author_rank: Newbie
timestamp: November 29, 2016, 10:42:20 pm
content: Hi everyone .I am new to this forum and recently started studying electronics engineering ,as part of the personal projects and circuits I'm building, I want to start doing some work with smds as a result I was thinking of buying myself a cheap but decent hot air rework station;so far I"ve got my eyes on these two (please keep in mind my budget is limited ):1)http://www.ebay.com/itm/2-in-1-Soldering-Iron-Rework-Stations-SMD-Hot-Air-Gun-Desoldering-Welder-862D/112048211315?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D2%26asc%3D38530%26meid%3D4c0851de07214ccaa1822ab6be6a31d9%26pid%3D100005%26rk%3D1%26rkt%3D6%26sd%3D1622924444592)http://www.ebay.com/itm/3-IN-1-SOLDERING-IRON-STATION-HOT-AIR-REWORK-853D-WELDER/261872107964?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D2%26asc%3D38530%26meid%3D917b458bab9b471e9bc4c52b23ca9fb9%26pid%3D100005%26rk%3D1%26rkt%3D6%26sd%3D112048211315any help willbe greatly appreciated!!!