hybridfree/eevblog-posts huggingface dataset:
Identification for this air pressure difference chip - Page 1
Forum section: electronics / beginners

author: Ineedtolearn
author_rank: Newbie
timestamp: May 08, 2022, 06:07:36 pm
content: Bought i2c air pressure difference sensor from Aliexpress. After non-working i2c attempts realized this might be an analog version of the same sensor, since port 3 voltage variates when blowing towards the sensor. But there are many pressure range versions of this chip and markings under the chip are nothing like in assumed datasheet. Does anyone recognize this sensor? What it might be?Datasheet for what it should be, but is not (i2c):https://www.cfsensor.com/static/upload/file/20220412/XGZP6897D%20Pressure%20Sensor%20Module%20V2.4.pdfDatasheet for what it could be, but markings doesnt match:https://www.cfsensor.com/static/upload/file/20220412/XGZP6897A%20Pressure%20Sensor%20Module%20V2.3.pdf

author: ledtester
author_rank: Super Contributor
timestamp: May 09, 2022, 04:17:04 am
content: You could try asking cfsensor. Tell them you bought a batch of sensors you were told are XGZP6897A's and just wanted to verify it.The datasheet lists an email address: info@cfsensor.com

author: Ineedtolearn
author_rank: Newbie
timestamp: May 09, 2022, 11:32:05 am
content: Thanks. They replied that I should have verified the pressure range once I bought them and those markings doesn't mean anything. I guess I need to buy another one.

author: daisizhou
author_rank: Super Contributor
timestamp: May 10, 2022, 12:09:57 pm
content: I have used their sensor.The above number only represents a model, you need to correspond to the parameters according to the data.
Identification of 2 chips - Page 1
Forum section: electronics / beginners

author: Stonent
author_rank: Super Contributor
timestamp: June 19, 2013, 06:46:46 pm
content: I can't find anything on the part number on Toshiba's site, and the other one I can't even tell who makes it.Both came out of a USB Glucose tester. A previous revision of the tester used an STM32F103 Cortex M3 chip so I suspect one of these might be an ARM chip.Pictures of these chips on the board are here:https://www.eevblog.com/forum/chat/this-might-make-an-interesting-teardown-(free-usb-glucose-meter)/15/Also if it helps both chips are about the size of 1/2 of your small finger's nail. (6 or 7 mm?)

author: Caleb_P
author_rank: Newbie
timestamp: June 19, 2013, 08:07:35 pm
content: Most likely custom badged chips. If you buy enough or pay extra, the manufacturer will gladly put whatever labeling you want on the chip.

author: Paul Price
author_rank: Super Contributor
timestamp: June 20, 2013, 01:36:57 am
content: The one on the left is definitely not an ARM chip.

author: Stonent
author_rank: Super Contributor
timestamp: June 20, 2013, 03:23:39 am
content: Quote from: Paul Price on June 20, 2013, 01:36:57 amWhy? Do all ARM chips have to say ARM on them or something like that?

author: amyk
author_rank: Super Contributor
timestamp: June 20, 2013, 12:24:17 pm
content: I'm inclined to say it might be ARM-based, given that Toshiba has a few and the older design was ARM-based too.The BGA on the right is also present on the older version, some sort of analog front-end processing I'd guess.

author: Stonent
author_rank: Super Contributor
timestamp: June 21, 2013, 01:50:26 am
content: Possible identification of the second chip:http://datasheet.octopart.com/UPD70F3796GC-UEU-AX-Renesas-datasheet-10979623.pdfRenesas UPD70F3796.. I don't know for sure if I'm right, but the part number is a partial match and they do have lqfp and bga versions.More possible proof, on their applications page they show a some medical devices and one of the pictured devices is an unmarked Bayer glucose meter (same "contour" brand, but different design)http://documentation.renesas.com/doc/DocumentServer/R01CL0029ED0200.pdfIntegrated 256 to 1024k flash, 100 to 128 pins, 40 to 80k ram, 2.0 to 3.6v.http://am.renesas.com/press/news/2011/news20110808.jspQuote

author: amyk
author_rank: Super Contributor
timestamp: June 21, 2013, 08:31:09 am
content: I think you hit the nail on the head. Good work!That's a pretty full-featured MCU with lots of peripherals. Unfortunately it's also a relatively obscure architecture and also has a "disable chip erase" security setting, so it might not be able to be cleared and repurposed easily.The older revision of the device has a Matsushita BGA in its place. Something else equally obscure...?

author: Stonent
author_rank: Super Contributor
timestamp: June 21, 2013, 09:05:51 am
content: Yeah, I had my heart set on an ARM chip, even a low end one like the STM32 or Atmel SAM.But I am considering getting a cheap digital logic analyzer so maybe would be something interesting to probe around on. There's certainly enough test points.
Identification of firmware while teardown - Page 1
Forum section: electronics / beginners

author: Freshman
author_rank: Regular Contributor
timestamp: November 06, 2024, 10:12:59 am
content: So, I had this idea.When I do a product teardown, I can find what are the hardware ICs/components that are there.How about to go and find what is the type of firmware that the product actually uses?Where it uses like RTOS, or Bare metal coding? - Any idea on how to identify this (software perspective) when doing product teardown?

author: radiolistener
author_rank: Super Contributor
timestamp: November 06, 2024, 03:44:35 pm
content: just open About menu or look for stickers.

author: u666sa
author_rank: Frequent Contributor
timestamp: November 06, 2024, 04:27:58 pm
content: I think the main reason for teardown is good hi-res images of everything, and like you said, component names, and often overlooked, extracted firmware when possible. Either through j-tag or by desoldering eeprom or mcu.What kind of firmware it uses, I think nobody cares.

author: tunk
author_rank: Super Contributor
timestamp: November 06, 2024, 05:12:02 pm
content: Some devices has a header for TTL serial port.

author: pcprogrammer
author_rank: Super Contributor
timestamp: November 06, 2024, 07:43:15 pm
content: If extraction is possible, use a disassembler like Ghidra and look at the code found.The type of processor used can be an indicator of what to expect. If it is a simple slow one, the change of it running an OS like Linux is very low. If it is bare metal can be judged on the main function that can be found by tracing the code from the reset vector. Use of interrupts can tell a lot of tales.Questions like "is there a boot loader" can also help in identifying code. A boot loader can have some communication via some accessible interface and provide information about it's version, etc. (Like tunk suggested a TTL serial port)But it ain't clear cut and simple.And even when identified it does not tell what the real important part entails. The device needs dedicated software to perform its function. Reverse engineering that is much more of a task.Then there also is the matter of programmable hardware like FPGA's. If such a chip is used in a device there is also the question what does it do in that black box.There is a lot to tearing down a product and it requires time, knowledge, experience and tenacity.
Identification Of SMD Component - Page 1
Forum section: electronics / beginners

author: pathas
author_rank: Newbie
timestamp: July 02, 2023, 09:21:15 am
content: Hello Forum,I am trying to identify an SMD component marked 100TF. I have attached a photo and have looked through various SMD Data books, but to no avail.If anyone can point me in the right direction, it will be greatly appreciated.Cheers,Paul Thomas

author: PA0PBZ
author_rank: Super Contributor
timestamp: July 02, 2023, 09:39:11 am
content: Hard to verify without context but have a look athttps://www.onsemi.com/download/data-sheet/pdf/fan3100t-d.pdf

author: pathas
author_rank: Newbie
timestamp: July 03, 2023, 12:46:39 pm
content: The SMD Component drives an IGBT via a 220R resistor. I have found that the IGBT has gone short circuit and took out the resistor. I'm concerned that I should replace this SMD part as well in case it has been cooked. Although it is not measuring a short, I want to know the internal circuit so as to make an informed decision.thanks,Paul

author: PA0PBZ
author_rank: Super Contributor
timestamp: July 03, 2023, 01:22:42 pm
content: There is a block diagram in the datasheet. As long as you don't have a short from the output to either VDD or GND you should be fine. Even if it's not the correct datasheet I guess you can identify the output and measure accordingly.
Identification of TomTom battery connector - Page 1
Forum section: electronics / beginners

author: mixiom
author_rank: Contributor
timestamp: June 30, 2017, 02:05:41 pm
content: Hello!I would like to know the name of the connector used (not exclusively) on the Li-Ion batteries in TomTom-GPS. It is small, made of black plastic, has usually 3pins and … well please take a look, I found several images. Note: the connectors can have more than 3 pins.To find more  you can google "tomtom battery connector".Thanks in advance.

author: stj
author_rank: Super Contributor
timestamp: June 30, 2017, 02:14:42 pm
content: what is the pitch / pin spacing?

author: mixiom
author_rank: Contributor
timestamp: June 30, 2017, 02:27:24 pm
content: Pin spacing is <=1.2mm. I used my cheap calipers freehanded, so take the 1.2 as maximum. I could not think of a way to measure the spacing accurately in a hurry. I hope it helps anyway.

author: stj
author_rank: Super Contributor
timestamp: June 30, 2017, 03:59:30 pm
content: could be JST SH series, or Molex 53047 series?seeing the other connector would help.https://www.rapidonline.com/jst-sh-series-1mm-header-538686https://www.rapidonline.com/molex-1-25mm-wire-to-board-headers-72355
identification smd components - Page 1
Forum section: electronics / beginners

author: stoica adrian
author_rank: Contributor
timestamp: March 30, 2016, 09:01:46 pm
content: Hello,I have in my hand these two componets with the mark/code: .3AyJ, .3AJJ; on a SOT143 (TO 253), SOT343 package, thus any one have an idea what these are?

author: sherlock
author_rank: Contributor
timestamp: April 03, 2016, 11:52:50 pm
content: The 3AY component is a 2sA1324Y Si PNP transistor. The 3AJJ doesn't appear in anything I have. Usually if you go onto Google and type in the number followed by "smd" you can get the device information. Fro example, type "3AY smd" (without the quotes). Recheck the number on your 3AJJ part. I even checked 3AJ but nothing came up there either. Could be a manufacturer specific number.
Identification - Page 1
Forum section: electronics / beginners

author: J4e8a16n
author_rank: Regular Contributor
timestamp: March 23, 2016, 02:50:32 pm
content: Hi,This is a curve tracer from herehttp://www.thaikits.com/index.php/measurement-testing-checker/ch012-transistor-curve-tracer-adapter-xy-oscilloscopes-2-ranges-biasOnline%20Electronic%20Kit%20Store.htmlWhat are the pieces (all the same) indicated by the arrows?JPD

author: vasi_ro
author_rank: Unknown
timestamp: March 23, 2016, 02:56:28 pm
content: It's a zero ohm resistorhttps://en.wikipedia.org/wiki/Zero-ohm_link

author: elgonzo
author_rank: Unknown
timestamp: March 23, 2016, 02:57:17 pm
content: 0 Ohm (zero Ohm) resistors. Kind of a fancy wire jumper...(Used in small to medium scale production, when the assembler does not want/can't handle normal wire jumpers.)

author: SeanB
author_rank: Super Contributor
timestamp: March 23, 2016, 04:41:47 pm
content: Made so you can use an auto insertion machine to put them in.

author: elgonzo
author_rank: Unknown
timestamp: March 23, 2016, 05:36:47 pm
content: Quote from: SeanB on March 23, 2016, 04:41:47 pmAuto insertion machines can also handle wire jumpers. (Otherwise you would not see this jungle of wire jumpers on many of these cheap single sided boards found in PSU modules and consumer AV gear...)For auto-placing wire jumpers, the assembler would need to dedicate either a head of a multi-head inserter or a separate inserter for this task. For small to medium size runs, the economics can be in favor of using 0 Ohm resistors (which are more expensive than simple wire jumpers) compared to the cost of setting up and operating a dedicated inserter for jumper wires...

author: J4e8a16n
author_rank: Regular Contributor
timestamp: March 23, 2016, 06:30:14 pm
content: Thank you!

author: SeanB
author_rank: Super Contributor
timestamp: March 23, 2016, 07:06:47 pm
content: I have seen a few copier boards where the number of jumpers is around 5 times the number of electronic components on the board. Literally 20 connectors, 40 capacitors, resistors and diodes and around 300 numbered jumpers, all in one of 4 lengths. They would even have 5 different jumpers joining one pin of one connector to the other next to it, just running across the board. All this so they could use a wave solderable SRBP single sided board with additive copper plating ( the dozens of punched holes with thin traces leading to them) to cut cost to the bone.Another trend is to use a double sided SRBP board, made by laminating 2 separate boards together, then punching the through holes in it, then using a conductive paste to join the vias together, followed by a protective tenting over these joins. 100mA power conductors need around 5 vias together to get the voltage drop down.
identifing a component value need help here - Page 1
Forum section: electronics / beginners

author: Alberto-Elaria
author_rank: Newbie
timestamp: August 27, 2011, 06:41:05 pm
content: http://imageshack.us/photo/my-images/822/281zgxd.jpg/its smd inductor but what is the 100 stand for???and how do i know the inductency for that liitel guy???becuse i want replace it with none smd type becuse i cant it find it i have to order it online it will take timeand does it have a polarity - or + ?

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: August 27, 2011, 07:20:02 pm
content: Probably 10 uH- code is same as for resistors and caps - 2 digits plus the number of zeros.Current rating will often matter, but something of a similar physical size would be OK.
Identifing the function of an IC labeled with "TMS3731BNL" - Page 1
Forum section: electronics / beginners

author: mythbu
author_rank: Newbie
timestamp: October 12, 2015, 08:34:12 am
content: Hi!I got a lot of old ICs from an electronic supplier here in Germany. One of those ICs is the "TMS3731BNL" from Texas Instruments (I actually got 30 of them). I've already tried to identify the IC using the standard Google method and the TI website but didn't find any information besides the name of the IC on some broker forums. I also asked this question on a German electronics forum (http://www.mikrocontroller.net/topic/378873?goto=4306473) but got no response.So I thought that it might be a good idea to ask it here: could you help me to identify the IC, please? The information given on the chip is as follows:Code:TMS3731BNL7113 QBGERMANY 8727Clearly manufactured in the 27th week of 1987 (so "Germany" might be wrong, it's more likely West Germany) . But that's all what I know and could find. I've also attached an image of the IC.Greetings from Germany,mythbu

author: GNU_Ninja
author_rank: Regular Contributor
timestamp: October 12, 2015, 09:08:17 am
content: Here:http://obsoletetellyemuseum.blogspot.co.uk/2011/02/grundig-super-color-184530-serie-30f18_5137.htmlSeems to be used as part of the tuning system in old school TV's

author: mythbu
author_rank: Newbie
timestamp: October 15, 2015, 05:52:06 am
content: Thank you very much for identifiying this chip but it is not useful for me, so I'll throw it into the garbage bin ...
Identifiying DO-7 Germanium diodes - Page 1
Forum section: electronics / beginners

author: shakalnokturn
author_rank: Super Contributor
timestamp: September 25, 2024, 11:24:56 am
content: I started out on a quest for near-enough replacements for OA90 diodes in Technics audio amplifiers, what a suitable substitute should be is not the subject here, the OA90 are available, just at ridiculous prices...The quest revealed that it's not that obvious at all to know what you think you're buying (let alone what you'll actually receive).Widely available 1N34(A) in DO-35 of course is some unknown Schottky.I ended up placing an order on eBay for a Thomson CSF model but received something else which the same seller also has as OA95, I'm not convinced they are OA95's with their red / white / green stripes 1N295 would have made more sense but I find no trace of these ever bearing colours.Are there any reference documents of that era on identifying diodes?For a same reference will some manufacturers use colour codes while others print the text on the diode?

author: Andy Chee
author_rank: Super Contributor
timestamp: September 25, 2024, 11:42:11 am
content: I'd stick them on a curve tracer, then compare then with published curves in datasheets.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: September 25, 2024, 12:21:39 pm
content: Why not? Here's one removed from a Sylvania hybrid (mid 60s era) color TV. Measures 0.235V forward (diode test), 60-70 "kΩ" reverse (1, 10M resistance range; reads 'OL' on 100s k range).I *think* I'd seen a datasheet a long time ago with stripes specified... but I might be imagining it. You'll have to go way back, RCA, GE, etc. datasheets from the 50s and 60s.Tim

author: shakalnokturn
author_rank: Super Contributor
timestamp: September 25, 2024, 04:15:59 pm
content: I don't have a proper curve tracer to play with.@Tim:Similar Vf and reverse resistance (50-70k) here, thanks for the measurements they gave me something to compare with.The 1965 General Instrument Germanium diodes catalogue lists the 1N295, they use DO-7 with EIA color code.http://bee.mif.pg.gda.pl/ciasteczkowypotwor/%23%20Books%20Catalogs/General%20Instrument%201965%20-%20Germanium%20Diodes.pdf

author: Benta
author_rank: Super Contributor
timestamp: September 25, 2024, 09:54:00 pm
content: Did you contemplate small-signal Schottky diodes?Characteristics are quite similar to the Ge-types and are much easier to source. But I don't know how OCD you are.

author: floobydust
author_rank: Super Contributor
timestamp: September 26, 2024, 12:27:46 am
content: Is there benefit to measuring the diode's tempco? I can't recall what it is for Ge. Just to confirm the materials.Isn't that why Technics is using them?edit: to answer OP's question, I looked and Philips used the Pro Electron marking scheme as opposed to the JEDEC scheme. The Philips Part 1 Diodes Databook I could not find.Telefunken 1979 1980 Diodes Databookhas the diode colour-code for both schemes, in German and English. I think I came up with BAV4 but that's not right.
Identify 6-PIN SMD by IC Company Prefix hidden by DAB acronym - Page 1
Forum section: electronics / beginners

author: Houseman
author_rank: Regular Contributor
timestamp: March 28, 2022, 01:41:17 pm
content: A Google search.. not so clever... especially when a 6-pin SMD Chip which has a DAB G3 code on it and the search is confused by the more common DAB standard for radio.Here the picture.It must be a switcher / a protection or something else used in a mixed analog/digital instrument which outputs a current in the mA range.Have tried to search by company manufacturer, by topology nothing.Maybe someone, more clever than me, can give me a hand by finding the datasheet...Thanks

author: rob77
author_rank: Super Contributor
timestamp: March 28, 2022, 02:22:06 pm
content: try to add the package into the search.. e.g. "DAB SOT26" or sot23-6 or sc70 .... first hit that way pointed to DMN5L06DMK dual mosfet which is most probably the part.

author: rob77
author_rank: Super Contributor
timestamp: March 28, 2022, 02:27:41 pm
content: forgot to link the datasheethttps://www.diodes.com/assets/Datasheets/ds30927.pdf

author: Houseman
author_rank: Regular Contributor
timestamp: March 28, 2022, 09:13:29 pm
content: Thank You, man! You rule!!!GOOGLE 1 - MYSELF 0
identify a transistor. - Page 1
Forum section: electronics / beginners

author: Edwin the inductor
author_rank: Newbie
timestamp: February 02, 2020, 07:47:15 pm
content: Hello! I working on reper a old analog radio. the problem is that one of the two identical channels dont work. the problem is that the card that gives the amp som strange pawer, haw a no named broken transistor. it's a two channels radio so I have still a identical working transistor, now to the real problem how cud I now wot transistor it is a transistor tester dont work i cant fine anything in the PCB diagram?Help!here is the link to the service manual and som schematicshttps://www.radiomuseum.org/r/tandberg_huldra_9.htmlhttps://www.manualslib.com/manual/1009848/Tandberg-Huldra-10.html?page=4#manual

author: Zero999
author_rank: Super Contributor
timestamp: February 02, 2020, 08:27:55 pm
content: How old is the radio?Did you unsolder the transistor from the circuit before testing it?Could it be germanium, which is why the transistor tester didn't work?

author: andy3055
author_rank: Super Contributor
timestamp: February 02, 2020, 09:03:26 pm
content: Take a picture of it and post it here that shows any letters/numbers etc.

author: Shock
author_rank: Super Contributor
timestamp: February 03, 2020, 04:44:17 pm
content: RCA 38202?Edit:Is the other identical one easier to read the numbering, perhaps take a photo of that as well.Couple of hints, find a date code somewhere let us know and look up RCA transistor manuals from around that time, before and after the date. It may be a custom spec part so searching could be hard.Always provide as much info upfront about what you are actually working on. Even back then the same radio could be sold as several different brands or models. So it could be a case of having several schematics or they copied someone elses design. Link schematics if you have them.

author: andy3055
author_rank: Super Contributor
timestamp: February 03, 2020, 05:02:35 pm
content: Could be RCA 39202. I could not find either of them so far. OP may have to do an exhaustive search on line.

author: vu2nan
author_rank: Contributor
timestamp: February 04, 2020, 11:46:21 am
content: Could it be RCA 39302?The equivalent of RCA 39302 is NTE 152 - NPN Si AF Amplifier.Regards,Nandu.
Identify all letter on fuses body - Page 1
Forum section: electronics / beginners

author: Jasonbit
author_rank: Regular Contributor
timestamp: July 14, 2020, 02:12:35 pm
content: Hello,I have a glass fuse which have this description on this body "F200mA L250V P".I can identify this information:F - represent an rapid fuse;200mA - represents the maximum of current which this fuse supports;L - I can't identify this letter. But maybe I would venture to stay that means "general uses";250V - represents the maximum of voltage this component supports;P - I don't know.I don't know who your manufacturer is. This fuses belongs to a multimeter.Thanks

author: Vovk_Z
author_rank: Super Contributor
timestamp: July 15, 2020, 03:59:11 pm
content: 'P' may mean 'Lead Free', if this is wired fuse (for Littlefuse maker, for example).To change it you don't need much info. Just find similar size fast blow 200 mA fuse (of cause, 250 V rated).To identify it totally we need a manufacturer name, but we don't have it.

author: mikerj
author_rank: Super Contributor
timestamp: July 17, 2020, 10:27:17 am
content: ThisLittlefuse PDFmight help. L appears to be a breaking capacity code.

author: Jasonbit
author_rank: Regular Contributor
timestamp: July 27, 2020, 11:04:25 am
content: Thanks to yours replies.
Identify Autotune PID algorithm  - Page 1
Forum section: electronics / beginners

author: Vindhyachal.takniki
author_rank: Frequent Contributor
timestamp: April 29, 2020, 10:05:37 am
content: 1. I have checked autotune PID for Delta Temperature PID controller for maintaining temperature of oven.2. We set autotune temperature to 75C & current oven temperature is 38C. In attached graph, y axis is reading of temperature divided by 10 so 700 represent 70.0C & x axis is equal interval of reading every 500millisecond.3. We started the autotune algorithm and measure temperature with our temperature sensor placed closely to delta sensor and with CRO measured the output signal which turn on/off the relay.4. Here it goes:a) First relay is given 100% duty cycle and fully on, upto 75C & temperature keep on increasingb) At 75C, relay is off completely. Temperature keeps on rising as heater is already heating, it falls to 75 in second stage as in pic.c) Now again delta PID turn on the relay 100% duty cycle, temperature goes below a bit, since it was already cooling & then start rising again in third stage.d) In fourth stage, it completely turn off the relay, temperature goes up a bit & then falls down to 75C, at this point delta PID shows Autotune completee) Then it try to maintain the temperature by maintaining duty cycle according to PID values calculated. Time period is 20seconds & duty cycle varies.5) Do anyone know which algorithm it may be? Since no sine in output is observed so most of algo for PID tune are rejected. So it may be:a) Cohen-Coon Method (Open-loop Test)b) Ziegler-Nichols Method( open -loop test)c) Or it may be Delta own algod) ANy other algo which fits such kind of graph6. If its Delta Algo then its ok, otherwise anyone know what else algo it may be? Or how to tune PID values from it

author: Vindhyachal.takniki
author_rank: Frequent Contributor
timestamp: May 01, 2020, 02:48:48 pm
content: this seems to me like ZS open loop method:http://techteach.no/publications/articles/zn_open_loop_method/zn_open_loop_method.pdfCurve in post#1 has two curves as mentioned in pdf here.1. Now I trying to understand on which of curve this tangent method is applied?2 Also page 4 mentions the formula for PID values where Kp, Ti & Td are mentioned. Surprisingly delta PID autotune parameters after its completed are: P = 18.6 , I = 251 , D = 62In Delta Electronics PID you can check calculated PID values.3. if we look on formula page 4Ti = 4LTd = 0.5LCalculated PID values from Delta PID are always consistent with this formula, we tried very different set point values.But Delta PID says its PID values while formula in pdf says its KP,Ti,Td values, but there is striking matching between values & their formulas.

author: Kleinstein
author_rank: Super Contributor
timestamp: May 01, 2020, 04:30:36 pm
content: For just the ZN open loop test, one would not need the 2nd half of the test. They may still use the simple test, but also do a few more checks in the 2nd half if the simple formula is OK.
Identify Capacitor - Page 1
Forum section: electronics / beginners

author: Teun
author_rank: Regular Contributor
timestamp: July 06, 2024, 11:26:45 am
content: Hi,Can someone tell me what kind of capacitor this is? Value, voltage, type etc. Or could it be a varistor? It came from a PA speaker which now has a DC voltage over the speaker. So I thought it was a decoupling capacitor.

author: Gyro
author_rank: Super Contributor
timestamp: July 06, 2024, 11:55:54 am
content: That looks like a PTC thermistor, aka self-resetting fuse. If you have DC voltage across the speaker (more than a few 10s of mV), the amplifier has a failed and the PTC thermistor has hopefully (but not necessarily) protected the speaker. Do not re-connect it until you have found and fixed the fault.

author: Rabbitoose
author_rank: Contributor
timestamp: July 06, 2024, 01:11:01 pm
content: Mostly like a 0.65A PPTC

author: Vovk_Z
author_rank: Super Contributor
timestamp: July 07, 2024, 02:18:45 pm
content: Yes, it looks like a 60 VDC rated PTC Polyfuse (0.65 A?)

author: Midphase
author_rank: Regular Contributor
timestamp: July 07, 2024, 03:27:10 pm
content: Is this what this is?https://pdf1.alldatasheet.com/datasheet-pdf/download/963635/FOSHAN/X0605MK.html

author: DL1DLZ
author_rank: Newbie
timestamp: July 10, 2024, 08:04:32 pm
content: Hi,Yes,It´s a PPTC Resettable Fuse, 60V 650mA holding Current ( tripping Current = X2, 1.3A ) Yageo BK60 SeriesDatasheet herehttps://www.farnell.com/datasheets/3217130.pdfGreetings from Bavaria near Munich!

author: Teun
author_rank: Regular Contributor
timestamp: July 13, 2024, 10:01:53 am
content: Ok thanks for all the help
Identify chip - Page 1
Forum section: electronics / beginners

author: Jk_delorean
author_rank: Newbie
timestamp: November 07, 2024, 07:40:48 pm
content: Hi!Would anyone recognise this chip. From what I can see it says 31D F7 but Google produces nothing from this. The chip appears to drive a bank of LEDs and is from a car tail light board.Any insight into what it is and a suitable replacement would be gratefully received.ThanksJon

author: u666sa
author_rank: Frequent Contributor
timestamp: November 07, 2024, 09:46:29 pm
content: Would be nice to know where all those pins go, bigger perspective.

author: wraper
author_rank: Unknown
timestamp: November 07, 2024, 09:50:53 pm
content: Dunno about part number but it's either dial BJT or dual mosfet which can be figured out by using multimeter in diode mode.
Identify chip MOSFET low side driver - Page 1
Forum section: electronics / beginners

author: pplaninsky
author_rank: Regular Contributor
timestamp: August 25, 2023, 08:20:04 am
content: Hi,I am repairing a DC motor driver circuit that has the FET gate driver blown.I sorted through about 20-30 datasheets, but can’t seem to find something matching this pin out.Any help is appreciated.It is SMD device and the manufacturer seems to be FMD …Schematics are simplified only indicated the usage (not all components are drawn).

author: pplaninsky
author_rank: Regular Contributor
timestamp: August 25, 2023, 08:26:36 am
content: Or is that some kind of an mCU and not a MOSFET driver?Who would do that and why?

author: gamalot
author_rank: Super Contributor
timestamp: August 25, 2023, 08:38:06 am
content: Where is the picture?

author: pplaninsky
author_rank: Regular Contributor
timestamp: August 25, 2023, 08:44:38 am
content: Looks like the one on page 10, fig. 1.5.MOSFET is driven with PWM on pin 4.https://datasheet.lcsc.com/lcsc/2007311535_FMD-Fremont-Micro-Devices-FT60F211-RB_C708779.pdf

author: pplaninsky
author_rank: Regular Contributor
timestamp: August 27, 2023, 04:44:23 pm
content: Here are the pics. Sorry.

author: gamalot
author_rank: Super Contributor
timestamp: August 27, 2023, 10:22:38 pm
content: Unfortunately I couldn't find anything other than the English version data sheet and a picture.
Identify chips - Page 1
Forum section: electronics / beginners

author: yb0t
author_rank: Newbie
timestamp: April 22, 2025, 01:22:18 am
content: Hello all,I was wondering if anyone can help me identify the follow chips please?The chips are part of a network attached storage device daughter board. I believe they are some sort of DC to DC converters or regulator ICs?The markings LOOK like m605ef12 and m605ef05 which would make sense for 12 volt and 5 volt components respectively.Thanks, T

author: fzabkar
author_rank: Super Contributor
timestamp: April 22, 2025, 02:41:07 am
content: STEF05 and STEF12 e-fuses by STMicroelectronics.https://www.st.com/resource/en/datasheet/stef05.pdfhttps://www.st.com/resource/en/datasheet/stef12.pdfPCB protection devices - Electronic Fuse:https://www.hddoracle.com/viewtopic.php?p=8872#p8872

author: yb0t
author_rank: Newbie
timestamp: April 22, 2025, 10:05:03 pm
content: Fzabkar,Thank you so much!Follow up question if it is ok … how did you know this information? It is experience or a particular skill/database/trick? I would like to improve my device identification skills and was totally stumped by these chips …Thanks again!T

author: fzabkar
author_rank: Super Contributor
timestamp: April 22, 2025, 10:12:52 pm
content: Quote from: yb0t on April 22, 2025, 10:05:03 pmI recognised them immediately because I wrote a tutorial about them.An image search is one way to find the parts:https://www.google.com/search?imgtype=photo&q=ef05+dfn10+OR+dfn-10&tbs=isch:1,isz:m&udm=2https://www.google.com/search?imgtype=photo&q=ef12+dfn10+OR+dfn-10&tbs=isch:1,isz:m&udm=2https://www.aliexpress.com/w/wholesale-ef12-dfn.htmlhttps://www.aliexpress.com/w/wholesale-ef05-dfn.html
Identify circuits purpose - Page 1
Forum section: electronics / beginners

author: etnel
author_rank: Contributor
timestamp: June 20, 2021, 03:51:50 pm
content: removed

author: bob91343
author_rank: Super Contributor
timestamp: June 20, 2021, 09:30:41 pm
content: How about a schematic diagram?

author: Raj
author_rank: Frequent Contributor
timestamp: June 21, 2021, 04:32:24 pm
content: That's a lot of diodes on a single track...don't trust my word cause I'm not sure, but those could be TVS diodes and zener diode to suppress ESD

author: gamalot
author_rank: Super Contributor
timestamp: June 21, 2021, 06:46:06 pm
content: Those diodes are Fairchild ES1F fast rectifiers and Onsemi P6SMB18CAT3G TVShttps://datasheet.octopart.com/ES1J-Fairchild-Semiconductor-datasheet-68802572.pdfhttps://rocelec.widen.net/view/pdf/bmzrfasimf/ONSM-S-A0001810247-1.pdf?t.download=true&u=5oefqw
identify component for me - Page 1
Forum section: electronics / beginners

author: rickbieze
author_rank: Newbie
timestamp: April 10, 2019, 05:56:48 pm
content: dear people, i am looking at a PCB right now and i'm trying to figure out what all parts are, since i dont know the name of the component its kind of hard to google it.. so.. my question, whats the part with the "100" on it called ?see the picture for referencethanks in advance! sorry for the noob questionpic link

author: ataradov
author_rank: Super Contributor
timestamp: April 10, 2019, 05:59:33 pm
content: This is an inductor. 100 is its inductance code -> 100 = 10 × 10^0 = 10 uH.

author: rickbieze
author_rank: Newbie
timestamp: April 10, 2019, 06:19:33 pm
content: thanks Alex!
Identify component from retro Apple card. - Page 1
Forum section: electronics / beginners

author: gmc
author_rank: Regular Contributor
timestamp: March 15, 2024, 03:07:49 pm
content: I'm busy reverse engineering a Apple Super Serial Card from the 1981 and come across a component which I haven't been able to find any information on.Google doesn't find any information on the part and I can only guess looking at the schematic.Part: 600-0008-AA 16 pin square block. The silkscreen on the PCB says modem terminal but I don't think that references the component.I've attached a picture of the component as well as the schematic.The 1488/1488 are quad line drivers/receivers.My best guess is the component is some kind of inductor/coil to reduce noise, but then am wondering why pin 13 and 14 is connected in parallel if it's just a straight through coil?It's connected to J1 which then connects to a DB25 connector for serial comms to a Apple II.Anyone recognise this and know what's it's function is, and what modern day equivalent it can be replaced with.Unfortunately I'm working from the schematic/photo's so can't do any continuity testing.

author: coromonadalix
author_rank: Super Contributor
timestamp: March 15, 2024, 03:16:20 pm
content: i think you could go with rs323 chip interfaces since you have 1488 1489 buffersor any usb rs232 interfaces chip etc ... since the 6551 as the tx rx cts and other pinsthis chip could be some in disguise since it is in a big package, could be a level shifter for the rs232 levels ?http://www.applelogic.org/files/R6551.pdfhttps://mike42.me/blog/2021-07-adding-a-serial-port-to-my-6502-computerhttp://jefftranter.blogspot.com/2012/03/6551-acia.htmlhttp://retro.hansotten.nl/6502-sbc/lee-davison-web-site/acia-6551/

author: gmc
author_rank: Regular Contributor
timestamp: March 15, 2024, 03:23:36 pm
content: Thanks, useful linksAs luck would have it just found this in a manual.It's a simple jumper block.Now trying to wrap my head around what the connections would be with it connected up and down.

author: Andy Watson
author_rank: Super Contributor
timestamp: March 15, 2024, 03:41:29 pm
content: An Apple Parts List:http://www.bitsavers.org/pdf/apple/service/Apple_Parts_Lists_1984.pdfpage 49, has it listed as "Configuration Block".My guess would be that it is a block of wire links that can be unplugged and turned through 180 degrees to reconfigure the unit as a modem type of RS232 connection. There's an arrow/triangle on the top that points to either "terminal" or "modem" on the PCB legend.

author: gmc
author_rank: Regular Contributor
timestamp: March 15, 2024, 03:49:46 pm
content: Thanks. You are spot on. Changing the orientation allows you to connect as a modem or terminal.

author: amyk
author_rank: Super Contributor
timestamp: March 17, 2024, 08:30:34 pm
content: Apple's proprietary part numbering scheme has been 3 digits followed by 4 digits for a long time.

author: coromonadalix
author_rank: Super Contributor
timestamp: March 19, 2024, 03:56:59 pm
content: Quote from: gmc on March 15, 2024, 03:23:36 pmthks ive been had loll
identify component - Page 1
Forum section: electronics / beginners

author: ToBeFrank
author_rank: Regular Contributor
timestamp: November 29, 2011, 05:55:44 pm
content: Any idea what this is? I think it's some sort of input protection, but not sure what.

author: 8086
author_rank: Super Contributor
timestamp: November 29, 2011, 06:07:04 pm
content: F1....a fuse, perhaps?

author: Zero999
author_rank: Super Contributor
timestamp: November 29, 2011, 06:17:17 pm
content: It's a 500mA pollyfuse.

author: ElektroQuark
author_rank: Unknown
timestamp: November 29, 2011, 07:01:29 pm
content: I know waht a fuse is, but a pollyfuse? Never heard about it. Can you explain please?

author: enz
author_rank: Regular Contributor
timestamp: November 29, 2011, 07:11:24 pm
content: Quote from: EdoNork on November 29, 2011, 07:01:29 pmThat was just a typo. He meant PolyFuse. That is a resetable Fuse, something like this:http://search.digikey.com/us/en/products/PFSM.050.2/486-1175-2-ND/639773Regards, Martin

author: metalphreak
author_rank: Frequent Contributor
timestamp: November 29, 2011, 08:25:38 pm
content: Yeah its a PTC fuse / poly fuse / resettable fuse.The ones like that are usually for higher current or higher voltage. The small flat ones that look like a SMD resistor usually only have a voltage range upto ~10V.Bourns Datasheet for reference:http://www.farnell.com/datasheets/77470.pdfI've used these on a few projects that have variable input voltage that exceeds the specs of the other type.

author: ToBeFrank
author_rank: Regular Contributor
timestamp: November 29, 2011, 09:51:41 pm
content: Thanks guys!
Identify Connector - Page 1
Forum section: electronics / beginners

author: bubsterboo
author_rank: Newbie
timestamp: November 23, 2021, 06:11:08 am
content: Looking for help to identify this connector. It has 2.54mm pin pitch.

author: bubsterboo
author_rank: Newbie
timestamp: November 24, 2021, 05:34:04 am
content: After hours of browsing Mouser and Digikey I think it may be the Hirose DF1E series.https://www.digikey.ca/en/products/detail/hirose-electric-co-ltd/DF1EC-6P-2-5DSA-35/5416404

author: tooki
author_rank: Super Contributor
timestamp: November 24, 2021, 07:07:16 pm
content: Certainly looks like it matches. I think your sleuthing was successful!
Identify connector manufacturer/part number - Page 1
Forum section: electronics / beginners

author: sjezdic
author_rank: Newbie
timestamp: September 11, 2025, 03:08:03 am
content: Please help me identify manufacturer/part number of this connector

author: squadchannel
author_rank: Frequent Contributor
timestamp: September 11, 2025, 03:27:39 am
content: jst pud?

author: sjezdic
author_rank: Newbie
timestamp: September 11, 2025, 11:55:15 pm
content: Yes! Thank you? 👍😊
identify connector type - Page 1
Forum section: electronics / beginners

author: lostscientist
author_rank: Newbie
timestamp: October 05, 2018, 02:28:26 pm
content: Can anyone help identify the (type of) connector on the end of this board? Approx internal width is 11mm.

author: Benta
author_rank: Super Contributor
timestamp: October 05, 2018, 04:14:12 pm
content: AMP or Molex I'd say.Today Tyco Electronics.

author: piguy101
author_rank: Regular Contributor
timestamp: October 05, 2018, 10:40:55 pm
content: This 1775469-5 connector from TE (AMP) is the closest one I could find.https://www.digikey.com/product-detail/en/te-connectivity-amp-connectors/1775469-5/A100083CT-ND/2078132

author: lostscientist
author_rank: Newbie
timestamp: October 20, 2018, 03:16:53 pm
content: Just wanted to come back to say THANK YOU for the speedy and (above all) accurate identification. Received my shipment from Digi-Key yesterday and the connectorpiguy101specified is a perfect fit

author: piguy101
author_rank: Regular Contributor
timestamp: October 22, 2018, 11:39:30 pm
content: Glad I could help.

author: r0d3z1
author_rank: Regular Contributor
timestamp: October 23, 2018, 12:19:24 pm
content: it looks like a JST PH series
Identify Connector Type - Page 1
Forum section: electronics / beginners

author: mintsoft
author_rank: Contributor
timestamp: January 03, 2017, 05:52:12 pm
content: Hello,I've been trying to identify what the name of the connector is on this part:http://www.digikey.co.uk/product-detail/en/sharp-microelectronics/GP2Y0E03/425-2856-ND/4103766http://www.sharp-world.com/products/device/lineup/data/pdf/datasheet/gp2y0e03_e.pdfIn the datasheet it describes the physical pin arrangement, but I'm guessing that it goes by a commercial name of some description?Thanks in advanceRob

author: bktemp
author_rank: Super Contributor
timestamp: January 03, 2017, 05:58:19 pm
content: JST: SM07B-SRKS-TB
Identify correct transformer for SMPS chip PN8356 - Page 1
Forum section: electronics / beginners

author: suspension
author_rank: Regular Contributor
timestamp: March 19, 2023, 05:20:43 am
content: HiI am trying to fix a battery charger which uses PN8356 chip as the buck converter to convert 240V DC to 5V DC.The data sheet of the chip is here:http://www.poweron.cn/en/product.asp?id=210The issue is the converter gives 5V when there is no load, but the moment a load is connected it seem to lose the regulation. I do not think the load draws large currents for current limit circuits to kick in. I replaced the main chip with a new one and results are same. The circuit uses only handful of components which are passive, so I am not sure where the issue might be. I suspect the transformer could be the issue however.I like to understand if it is possible to test a high frequency transformer found in this circuit.Secondly, where to buy such transformers and how to identify the specs. The transformer does not have any model number or specs on it. And the sample circuit of PN8356 does not give any specs either.ThanksSus

author: wasedadoc
author_rank: Super Contributor
timestamp: March 19, 2023, 06:41:02 am
content: First suspect is the electrolytic on the output of the rectifier on the transformer secondary.

author: eblc1388
author_rank: Frequent Contributor
timestamp: March 19, 2023, 06:54:48 am
content: It is highly unlikely that a faulty transformer would give you +5V while no load. You have also rule out the possibility of a faulty PN8356.1. Check the capacitance and ESR of the output capacitor, looks for any sign of bulging on top.2. Besides checking the output electrolytic capacitor, check also the input DC high voltage smoothing capacitor for bulging and loss of capacitance. The rectified voltage across its terminal should be around DC 340V. You can just solder another capacitor with the same high voltage rating in parallel and see if the problem goes away.3. Faulty PN8356 Vcc capacitor is also a possibility. This capacitor is usually rated at 10uF - 47uF, 50V.

author: jonpaul
author_rank: Super Contributor
timestamp: March 19, 2023, 11:13:59 am
content: xformers custom made by mfg. not a standard part99% probably the faults is dead control IC, or failed cap/ diode.The transformers are the most reliable partPoor quality Chinese IC, PCB, components fail frequentlyj

author: wasedadoc
author_rank: Super Contributor
timestamp: March 19, 2023, 11:34:01 am
content: Quote from: jonpaul on March 19, 2023, 11:13:59 amDead control IC is vey unlikely if no load output is 5 volts. High resistance winding in transformer could cause that but I've never experienced it. Have had to replace lots of output electrolytics. Bulging or leaking means they are bad but not does not mean they are OK. Replace with a good quality capacitor as they do have a hard life.

author: suspension
author_rank: Regular Contributor
timestamp: March 20, 2023, 08:21:31 am
content: Thanks everyone. As many of you guessed/suggested the fault was in a cap but in the input side. I already had the output cap tested and never suspected the input cap.Replacing it fixed the issues.Thanks
Identify cylinder in AudioQuest Niagara 5000 power conditioner - Page 1
Forum section: electronics / beginners

author: 13hm13
author_rank: Frequent Contributor
timestamp: March 27, 2020, 03:52:02 pm
content: Here are some of the guts from an audiophile product from California-based AudioQuest...https://forum.polkaudio.com/discussion/186931/inside-of-aq-niagara-5000Not sure what that large cylinder is ... maybe a SuperCap???

author: andy3055
author_rank: Super Contributor
timestamp: March 27, 2020, 04:13:43 pm
content: I thought so too. If you can trace the wires, you will know for sure.

author: AVGresponding
author_rank: Super Contributor
timestamp: March 27, 2020, 04:15:53 pm
content: If you read far enough down the page on the link supplied, you'll see that's exactly what it is.You'll also get a good laugh at some of the things audiophools say.

author: 13hm13
author_rank: Frequent Contributor
timestamp: March 27, 2020, 05:15:56 pm
content: Quote from: andy3055 on March 27, 2020, 04:13:43 pmYou'll void the warranty on $5,000 USD product (that's the actual price).!!!AQ claims those black poly caps with "AQ" were custom made by a military contractor. Supposedly, FWIW, formed while charged. There's video on YouTube about it, I think.

author: AVGresponding
author_rank: Super Contributor
timestamp: March 28, 2020, 01:54:43 am
content: Mil spec components are made by normal manufacturers, but to higher standards.Sometimes this means closer manufacturing tolerances, wider SOA margins, or hardening against various radiations by adding shielding, as often as not it's just hand selecting components from the regular production line.
Identify DC-DC converter chip - Page 1
Forum section: electronics / beginners

author: gmc
author_rank: Regular Contributor
timestamp: November 25, 2024, 04:49:34 pm
content: I've got a board I'm trying to repair with a faulty DC-DC converter chip.I can't seem to find any info on this chip but I do know it's a DC-DC converter chip. Fixed 5V output at 2 or 3A.Footprint is a SOP-8, and the logo looks like it's from the Avengers.I've not seen this logo before and had a look around a semiconductor logo database. The references on the chip also do not bring back anything useful. Had a look around Digikey/Mouser using parameter searches but do far have come up blank.Any pointers to the manufacturer or model number would be helpful.

author: u666sa
author_rank: Frequent Contributor
timestamp: November 25, 2024, 04:57:56 pm
content: alpha omega

author: gmc
author_rank: Regular Contributor
timestamp: November 25, 2024, 05:08:57 pm
content: Thanks very much. That should help me find the part of their website.

author: fzabkar
author_rank: Super Contributor
timestamp: November 25, 2024, 05:20:54 pm
content: https://www.google.com/search?q=filetype%3Adoc+OR+filetype%3Apdf+%22absolute+maximum%22+aa01+converter

author: calzap
author_rank: Frequent Contributor
timestamp: November 25, 2024, 05:46:59 pm
content: Yep, u666sa got it. Logos from different companies can look alike, especially if they're small. Compare Alpha-Omega and Acme-Chip below. Mike