hybridfree/eevblog-posts huggingface dataset:
My transistor beta tester--done! - Page 1
Forum section: electronics / projects

author: Analog Kid
author_rank: Super Contributor
timestamp: April 16, 2025, 02:49:09 am
content: Finally it's done.Ever had a project that seemed to fight you every step of the way? Well, this was one of them.I started work on this months ago; there's another thread here about my early efforts. I got a big boost to this project from @PCB.wiz, who showed me a simple way to implement this. (I'm still using this scheme, but with some improvement.) Here's the circuit I ended up with (as built):Anyhow, I got a design that I though would work, breadboarded it, and it did work.So then I started building it as a finished project, in a case and all.Got it all wired up; it didn't work. (Of course!)Well, it half-worked: it worked for NPNs, but not for PNPs.I diddled around with the main circuit board a bit; still no work.So I clipped everything out, soldered a bunch of wires to the header pins on the board so I could connect to a breadboard, started retesting it. Still no joy on PNP. Here it is during the rip-apart/retest phase:Well, to make an excruciating long story short, I finally ended up taking out the two PNP components (one of the LM334s and the adjustment pot) and replacing them. Bingo! It finally worked.So here it is:It even is reasonably accurate. (Certainly not claiming "real test instrument accuracy" here.) But it's plenty good enough for my purposes: binning, and matching transistors where needed.And in case anyone wants to bring it up, yes, I do understand that designing any circuit around a transistor's beta is a Bad Idea. I get it; we should only be using therangeof betas here, using the mean or average as a starting point. So don't worry; won't misuse this meter!It was a very good learning experience for me, especially coming up with that DC-DC converter (with hand-wound transformer!), which works quite well.One interesting little thing: you'll notice that I have an 11K current-limiting resistor on the power-on LED.11k?With the original 1K resistor, that damn thing was waaaay too bright.Tried 2K; 4.7K; 6.8K; still too bright.Ended up sticking in 10K in series with the 1K (which is on the circuit board); it's now pretty reasonable. Draws ~5mA.

author: DrijSkij
author_rank: Contributor
timestamp: April 22, 2025, 02:07:51 pm
content: It would be nice to see the rest of of your schema as it is cut off.Curiuos as to why you'd build one of these? We all know that Beta can be all over the place and isn't really a good parameter to rely on. Anyway, good job.

author: MK14
author_rank: Super Contributor
timestamp: April 22, 2025, 02:18:44 pm
content: Quote from: DrijSkij on April 22, 2025, 02:07:51 pmI think/suspect, it is for old school, roughly matching transistors. For audio amplifier uses, such as push-pull and other sections. To make them naturally be somewhat balanced. NPN to NPN, and NPN/PNP wise.Also, I'm curious on the brief specification of the custom wound transformer. Details of former, wire width and turn ratios.
My Two Tower Slayer Exciter Tesla Coil (Two Towers Better Than One?) - Page 1
Forum section: electronics / projects

author: mcsoftware
author_rank: Contributor
timestamp: March 05, 2022, 05:11:08 pm
content: I had two spare secondary coils I created when I was trying to get my first Tesla Coil working. I wondered if they were good coils, and if they were good, which one would be best? Then I figured, use both (both powered by a single Slayer Exciter circuit) - switch between the two or both at the same time. But the question is, "Are two towers better than one?". This video shows my results. Also includes LTspice circuit simulation to try to answer the question. BTW, in the spirit of a few of Dave's videos, I salvaged some parts from an old Mannesmann Tally printer.My guess as to why the results are what they are is that the addition of the second tower shifts the frequency (due to the timing changes of the negative feedback from each of the secondaries, since that controls the oscillation of the transistor). This would tweak the resonance. If the two towers don't have the same resonant frequency but aren't too dissimilar, one tower gets stronger while the other gets weaker (than they would on their own). I probed the feedback line in LTspice, and the frequency does change with the addition of the second tower (and different than each would be on their own). Can anyone verify my results and conclusion?
My Updated CPU Design: Hardware User Stack For Easy Subroutine Parameter Passing - Page 1
Forum section: electronics / projects

author: mcsoftware
author_rank: Contributor
timestamp: October 23, 2018, 05:53:12 pm
content: Hope this is the right subtopic/category... I updated my CPU design (in Logisim now, but hopefully someday in an FPGA) by adding a hardware user stack to make subroutine parameter passing, local variables, and recursion easier (in addition to my previously added hardware call stack). On the software side, I wrote a recursive factorial calculator to test this new stack, and improved my raytracer by making it fully recursive and adding refraction. BTW, not shown in this video (but will be the subject of another video): I converted all the assembly language programs I wrote for my CPU design into x86 assembly. Hope you enjoy this video:
My Velleman PS3005D fan upgrade - Page 1
Forum section: electronics / projects

author: Mikey
author_rank: Regular Contributor
timestamp: August 14, 2014, 06:42:20 pm
content: Replaced the noisy fan in my power supply (pretty much the same as the one from Korad Dave tested).Made a little guide too, even when it is a pretty easy upgrade.http://captain-slow.dk/2014/08/14/velleman-ps3005d-fan-upgrade/
Talk of internals of 80' 90' Japanese product  - Page 1
Forum section: electronics / projects

author: fanOfeeDIY
author_rank: Unknown
timestamp: January 05, 2019, 03:27:43 am
content: I used to work for several Japanese electronic companies and uploaded my view of 80’ to 90 internals of the products on the video.Talking about difference Sony, Panasonic, Sharp, Casio and etc.Inspection mark on electrolytic capacitors on switching power supply.My pronounce of electrolytic capacitors is wiredI was able to upload other contents than multimetersHave not finishing editing the third video yet.https://youtu.be/-aKAUejwSkchttps://youtu.be/RWOuAUGVifc

author: fanOfeeDIY
author_rank: Unknown
timestamp: January 14, 2019, 03:05:44 am
content: The third part of the video.Mostly talking about BD Drive and improving boot speed on Linux with Suspend to RAM.

author: tpowell1830
author_rank: Frequent Contributor
timestamp: January 14, 2019, 03:16:58 am
content: As BlueSkull says, good job! Keep it up!

author: fanOfeeDIY
author_rank: Unknown
timestamp: January 14, 2019, 10:05:13 am
content: Quote from: blueskull on January 14, 2019, 03:13:30 am

author: Mr. Scram
author_rank: Super Contributor
timestamp: January 14, 2019, 10:34:05 am
content: I like the videos. Thanks!

author: fanOfeeDIY
author_rank: Unknown
timestamp: January 14, 2019, 12:33:23 pm
content: Quote from: tpowell1830 on January 14, 2019, 03:16:58 amThanks!

author: fanOfeeDIY
author_rank: Unknown
timestamp: January 15, 2019, 02:54:16 pm
content: Quote from: Mr. Scram on January 14, 2019, 10:34:05 amYou are most welcome!
My WWV simulator project - Page 1
Forum section: electronics / projects

author: MarginallyStable
author_rank: Regular Contributor
timestamp: November 07, 2022, 09:34:53 pm
content: A little toy project I started a while ago. Simulating the WWV audio broadcast on a esp32 based M5stack. Automatically sets UTC time via gps, as well as has local database lookup for local time display. It is by no means "time nuts" quality, but does discipline the audio dma buffer to the gps PPS for "ticks" within a single audio sample of accuracy. Added automatic leap second support via gps information for added fun.Oh yeah, wait till the end (also includes the voice announcement)https://youtu.be/IL36d7pj_qc

author: KK6IL
author_rank: Regular Contributor
timestamp: November 13, 2022, 06:10:02 am
content: But I'm used to also hearing WWVH in the background.

author: MarginallyStable
author_rank: Regular Contributor
timestamp: November 14, 2022, 03:39:20 am
content: Quote from: KK6IL on November 13, 2022, 06:10:02 amHa,I didn't mention I can switch to WWVH tones.... I'll have to get another M5stack and have them play simultaneously.
My ZX81 (Sinclair/Timex 1000) - Page 1
Forum section: electronics / projects

author: SilverWingedSeraph
author_rank: Contributor
timestamp: April 04, 2016, 09:16:51 pm
content: Hi EEVBlog Forum! I just got a Sinclair/Timex 1000, known in the UK as a Sinclair ZX81. It was new-in-box, and is an absolutely beautiful bit of 1980s kit. HOWEVER, I would like to be able to use it on a relatively modern display. I know it's possible to convert the RF modulator out to RCA mono video, but... how? Does it require an internal mod, or is it practical to build a demodulator?Thanks for the help, and while you're thinking on the question, here:http://imgur.com/gallery/R0m4rare some photos of this beautiful machine!

author: IanJ
author_rank: Unknown
timestamp: April 04, 2016, 09:52:20 pm
content: Google:zx81 composite modificationHere's one example:-http://www.zx81stuff.org.uk/zx81/ts1500_video.htmlIan.

author: hendorog
author_rank: Super Contributor
timestamp: April 04, 2016, 11:23:52 pm
content: Quote from: SilverWingedSeraph on April 04, 2016, 09:16:51 pmOh that is very cool. I started programming on one of those that we borrowed from a friend, that started the journey for me...

author: SilverWingedSeraph
author_rank: Contributor
timestamp: April 05, 2016, 01:18:26 am
content: Well, I FINALLY finished the mod! Turned out, the collector-follower buffer wasn't sufficient; I had to also put three 1N4148 signal diodes in series with the output. After that, it worked a treat, as Dave would say! Thanks IanJ for pointing me in the right direction.I took photos all along the way:
MY723 - Page 1
Forum section: electronics / projects

author: iMo
author_rank: Super Contributor
timestamp: January 26, 2019, 10:15:10 am
content: Out of your junkbox you may create your own LM723, with better parameters, when luckyThis is a Sunday's afternoon project for people who like 723 vintage technology.You may get:1. lower min operating voltage,2. more stable and lower noise Vref (here 2.5V),3. much larger output current,4. otherwise -> MY723Here is a schematics which mimics the LM723, with above improvements.Adjust for your needs, do experiment with different parts and values..Use at your own risk

author: Wolfgang
author_rank: Super Contributor
timestamp: January 30, 2019, 10:00:03 am
content: Some comments:- You forget frequency compensation- TL431 more stable than 723 ref ? Not really.Otherwise:Rush to the patent office. I would buy this when it comes in a TO-220-7 Package.
Mylar capacitors out of spec... - Page 1
Forum section: electronics / projects

author: LektroiD
author_rank: Frequent Contributor
timestamp: May 12, 2015, 01:13:54 pm
content: I tested some mylar capacitors and they seem to be out of spec 100nF tested between 108nF and 111nF (confirmed on several meters including Fluke 87). These capacitors are 'J' rated (5%).I also have a batch of Panasonic J rated polyester capacitors which are within tolerance. Is it normal for Mylar film capacitors to be this far out of spec, or have I got a dodgy batch?I was planning to use the mylar for the more critical parts of the filtering circuit, but now I've discovered this, I'm undecided.

author: ruffy91
author_rank: Regular Contributor
timestamp: May 12, 2015, 01:16:53 pm
content: At which frequency are they specced? 10kHz or 100kHz? You have to make sure to measure at the correct frequency.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: May 13, 2015, 02:22:32 am
content: Also, what's the precision on that range?

author: calexanian
author_rank: Super Contributor
timestamp: May 13, 2015, 05:46:26 am
content: The fluke 87 series cap measurement is not all that accurate. Not in my experience anyways. Try an dedicated LCR. Also as said before, check what frequency the caps are tested at. On the whole however those values do not sound to out of line. Caps are about the worst component for meeting spec.

author: macboy
author_rank: Super Contributor
timestamp: May 13, 2015, 02:27:56 pm
content: Quote from: calexanian on May 13, 2015, 05:46:26 amUh, no. All parts should meet spec. Of course, there may be a few out of a batch that are out, but 95% of them or more should be in spec.Capacitors usually have a wider specified tolerance than other components, but they should still fall within the specified tolerance. If that is specified at 5%, they should be within 5% (that is a very tight spec for caps, BTW). You can't just shrug and say, oh well, it a cap, so whatever.

author: Kleinstein
author_rank: Super Contributor
timestamp: May 14, 2015, 07:34:40 am
content: Typical multimeters are not very accurate measuring caps. With mylar caps the capacitance should not depend very much on frequency, but i can depend on temperature. If the caps are old an were stored in humid environment this could have also altered there capacitance.Even if caps often have higher tolerance they should meet there specs - this is why they usually come in +-10% or even +100/-30% and only rarely as +-1%.

author: tautech
author_rank: Super Contributor
timestamp: May 14, 2015, 07:48:32 am
content: I'd never be worried with a cap that measures 10% over spec with trusted tools, 10% under well......
Mysterious part? - Page 1
Forum section: electronics / projects

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: October 08, 2018, 12:12:07 pm
content: Hi,Do you know what is the part number for this Fan IC, it's marking is first line 276 Digits and second line 1316 Digits, no other markings, so which Chinese manufacturer made these? what similar parts are available? any Idea?

author: xrunner
author_rank: Super Contributor
timestamp: October 08, 2018, 12:27:03 pm
content: Quote from: ali_asadzadeh on October 08, 2018, 12:12:07 pmIt looks like a common type of fan used in thousands of applications such as computer power supplies and cases. Can't you just get the size of it and order another one. I don't think they sell parts, as they are dirt cheap things to buy.

author: glarsson
author_rank: Frequent Contributor
timestamp: October 08, 2018, 12:48:58 pm
content: Interesting package. Driver, logic and hall effect sensor in the same package.

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: October 08, 2018, 01:19:52 pm
content: QuoteExactly, it should be dirt cheap and also has lot's of apps like toy Quad-copters!!if there are higher current versions available!

author: coppercone2
author_rank: Super Contributor
timestamp: October 08, 2018, 01:22:52 pm
content: looks like a chinese government spy bug

author: amyk
author_rank: Super Contributor
timestamp: October 08, 2018, 06:06:56 pm
content: Lots of different manufacturers make these, just search for "276 Hall IC".https://www.diodes.com/assets/Datasheets/AH276.pdfhttp://magnesensor.com/pimage/011413_MH276T_Specifications_V103.pdfhttp://www.grenergy-ic.com/attach/product/20141211174027_pic.pdfhttp://www.unisonic.com.tw/datasheet/UH276.pdf

author: John Heath
author_rank: Frequent Contributor
timestamp: October 09, 2018, 02:32:56 am
content: In the old days you just look it up in a ECG cross reference manual. Unfortunately hall effects became popular towards the tail end of the friendly EGC standards so it is had to find specifications on it without a manufactures white sheet. I would say hall sensor with coil drivers but don't rule out Chinese information bug.

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: October 09, 2018, 12:38:38 pm
content: QuoteThanks, I tought maybe it was a full FOC Motor driver!
Mysterious X-meter wish list - Page 1
Forum section: electronics / projects

author: ez24
author_rank: Super Contributor
timestamp: February 26, 2016, 09:52:38 pm
content: My wish list for the x-meter:A display that can tilt so it can be used as a handheld or bench or a bluetooth display that can show via an Android app while keeping the price down, <150Will Kickstarter be used for the x meter? Maybe money for the app.
Mysterious PCI motion controller Board - Page 1
Forum section: electronics / projects

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: May 09, 2017, 10:59:07 am
content: Hi,My friend has bought this board for his CNC machine, he wanted me to set it up this new hardware for him, first of all I can not find any datasheet or model for this board, do you happen to know it? also I can not figure out how this board is working... it seems it's a two layer board and if you see the pictures in detail you could see that it has left almost all the pins except the Power pins and two signal pins unconnected!!!they are PCI_PRSNT1 and PCI_PRSNT2 signals and they are also disconnected!

author: bktemp
author_rank: Super Contributor
timestamp: May 09, 2017, 11:17:35 am
content: I can see AT91SAM7S1 written on the board, so the ic under the glue is probably a AT91SAM7S128.The ic next to the LED looks like a MAX232 or similar.So my guess would be this card takes power from the PCI slot and converts commands supplied via RS232 (from the D-SUB9 connector) to signals at the other IO connector.So it requires an external cable to the COM port of the PC.

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: May 09, 2017, 11:39:09 am
content: Thanks, I think it might be a 5V MCU not AT91sam maybe AVR because there is no regulator on board and I can see that they got power from 5V and 12V rails only, the question is what are the DB25 connector printout and which software would run the board.

author: coppice
author_rank: Super Contributor
timestamp: May 09, 2017, 01:07:11 pm
content: Quote from: ali_asadzadeh on May 09, 2017, 11:39:09 amWhy would there need to be a regulator when 3.3V is available from the PCI connector?

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: May 10, 2017, 05:18:13 am
content: Because only the 5V power pins are connected not 3.3V ones

author: Monkeh
author_rank: Super Contributor
timestamp: May 10, 2017, 05:47:33 am
content: Gee, I wonder what the three pin IC near the microcontroller could be.
Mystery bayonet industrial connector - Page 1
Forum section: electronics / projects

author: ezalys
author_rank: Frequent Contributor
timestamp: March 11, 2020, 11:55:07 pm
content: Hey all. I found this connector on a linear motor I bought. Any ideas what it is?

author: KMoffett
author_rank: Regular Contributor
timestamp: March 12, 2020, 01:27:12 am
content: Looks like this:https://www.tme.eu/en/details/rm12bpe-5s-71/industrial-connectors-others/hirose/rm12bpe-5s-71/

author: Stray Electron
author_rank: Super Contributor
timestamp: March 12, 2020, 01:54:48 am
content: It looks like a 5 pin version of the old Amphenol XLR connector aka a microphone plug.

author: KMoffett
author_rank: Regular Contributor
timestamp: March 12, 2020, 07:31:41 pm
content: They have mating connectors if you need one. Also lists vendors that stock them.https://www.hirose.com/product/p/CL0109-0426-8-71?lang=en(I don't think XLR connectors were ever bayonet locking)

author: N2IXK
author_rank: Frequent Contributor
timestamp: March 13, 2020, 08:23:17 pm
content: Looks like a 5 pin version of the old 10 pin video camera plug.
Mystery Capacitor from 1978 - Page 1
Forum section: electronics / projects

author: iampoor
author_rank: Frequent Contributor
timestamp: November 14, 2013, 09:55:45 am
content: Hi!Im restoring a very cool piece of Broadcast/Recording studio equipment from 1978. Its an Orange County Vocal Stressor. Has an awesome parametric EQ and a Compressor that is to die for! O0Anyways, its time to recap it. I came across a few capacitors that I am not sure how to decode. They are axial electrolytics.From the top to bottom this is what one reads10 p *May as be a U* T25v030Mexico1 4 11 (may be a "U")I will try and get a couple of pics towmorrow if it helps (Tonight they are coming out very bad, need to wait till the sun comes up! haha). Im presuming its 10uf, but am I missing something? Out of circuit, My multimeter is reading it between 15-16uf. Unit is chok full of em!Thanks!

author: Paul Rose
author_rank: Regular Contributor
timestamp: November 14, 2013, 05:11:12 pm
content: Read that first 10p as a 10u.10 microfarad at 25volts
Mystery chip - IPL3314/8 - Page 1
Forum section: electronics / projects

author: rolycat
author_rank: Super Contributor
timestamp: August 30, 2017, 03:22:06 pm
content: This looks like an optical sensor of some sort, but I haven't been able to find any details. Does anyone recognize it?

author: Yansi
author_rank: Super Contributor
timestamp: August 30, 2017, 03:28:12 pm
content: Seems like a photodiode array. From what it came from?

author: rolycat
author_rank: Super Contributor
timestamp: August 30, 2017, 03:55:30 pm
content: From a piece of conductive foam in a small box marked "A Product of Integrated Photomatrix Ltd". Three chips in all - presumably samples. I don't know the intended recipient.

author: Fraser
author_rank: Super Contributor
timestamp: August 30, 2017, 04:42:33 pm
content: This may be of interest....http://www.decadecounter.com/vta/articleview.php?item=148Your IC appears to be a vintage imaging array with 14 pixels. It would likely have been coupled to a lens array directly (very low resolution) or a scanning mirror system (higher resolution) and would form part of a line scan camera. Such cameras are common on industrial production lines for product imaging, product counting and product presence detection.Fraser

author: Ian.M
author_rank: Super Contributor
timestamp: August 30, 2017, 04:49:53 pm
content: I did a bit of digging. Integrated Photomatrix Ltd was originally founded in September 1968, but its latest incarnation was a short lived company, registered in 2003 and as of 2007 all the directors had resigned and the company was dissolved. It was located in Dorchester, Dorset, UK and did various optoelectronic things including making photosensors with a linear array of dies that had been diced from the wafer as a unit, guaranteeing precise spacing. They also did custom photosensor arrays.Here's the datasheet for their similarIPL10220series.Their website can be found on the wayback machine:https://web.archive.org/web/20030319155311/http://www.ipl-uk.com:80/Your samples may be an older product from before they had a web presence or they may be custom parts - possibly an overrun used as samples.
Mystery chip - Page 1
Forum section: electronics / projects

author: SMTech
author_rank: Frequent Contributor
timestamp: November 26, 2020, 11:27:34 pm
content: any thoughts what this is, my google fu is failing me? Seems to be some kind of Power Mosfet ~6mm sq, of those those times when supplier ships completely the wrong thing ....

author: bob91343
author_rank: Super Contributor
timestamp: November 27, 2020, 04:19:33 am
content: How about some information to help - I presume you want help.

author: SMTech
author_rank: Frequent Contributor
timestamp: November 27, 2020, 08:34:45 am
content: it ate my image link, and its mostly curiosity oo and apparently I lied 3mm would be more like it. Hah, SiSHA10DN, clearly I haven't seen a Vishay Siliconix logo that often.

author: magic
author_rank: Super Contributor
timestamp: November 27, 2020, 01:54:34 pm
content: No idea, but the same happened to me once. Ordered an NXP transistor, received a different type from AOS.

author: rvalente
author_rank: Frequent Contributor
timestamp: November 27, 2020, 03:46:44 pm
content: By the $ logo on on the left of AA I'd say i'd guess its Vishay part.https://www.vishay.com/mosfets/
Mystery circular connector - Page 1
Forum section: electronics / projects

author: Jeroen3
author_rank: Super Contributor
timestamp: April 22, 2020, 11:43:58 am
content: I'm looking for this connector. I have googled and written up my distributor, but they haven't seen this one before.Maybe any of you know who made this connector?Chances are it is a connector made by an ancient european firm that has been eaten by the big boys a few times already.It has 12 positions currently 8 of them are wired to 1.5mm2 (15 awg?) with inside part dimension 25mm and screw part dimension 32mm.I do not have access to the counterpart.The only writing says CKB, which googles to Lemo. However Lemo already confirmed they never carried a product like this.

author: Rerouter
author_rank: Super Contributor
timestamp: April 22, 2020, 12:22:37 pm
content: Looks very similar to what I have seen on boat fish finders, but sadly still have no clue who makes those connectors.

author: MarkL
author_rank: Unknown
timestamp: April 22, 2020, 05:16:27 pm
content: It looks pretty close to some of these from Switchcraft:http://www.switchcraft.com/Category.aspx?Parent=901

author: DrG
author_rank: Super Contributor
timestamp: April 22, 2020, 05:25:43 pm
content: https://www.digikey.com/products/en/connectors-interconnects/circular-connectors/436?k=&pkeyword=&sv=0&pv88=80383&sf=1&FV=-8%7C436%2C1989%7C0&quantity=&ColumnSort=0&page=1&pageSize=25Circular connectors, 12 connections - gives thousands of options -Edit: Adding LEMO as the manufacturer gets it down to 674https://www.digikey.com/products/en/connectors-interconnects/circular-connectors/436?k=&pkeyword=&sv=0&v=1124&sf=1&FV=1989%7C0%2C-8%7C436%2C88%7C80383&quantity=&ColumnSort=0&page=1&pageSize=25Any of those match other details on yours?

author: daqq
author_rank: Super Contributor
timestamp: April 22, 2020, 07:25:31 pm
content: Could behttps://www.digikey.com/catalog/en/partgroup/buccaneer-standard/2181

author: Jeroen3
author_rank: Super Contributor
timestamp: April 23, 2020, 06:08:20 am
content: Quote from: MarkL on April 22, 2020, 05:16:27 pmThat's the problem. They all look pretty close...And if you have to find something in the catalogs of TE, you're basically looking for a nickel on the moon.edit:i found it...https://eu.mouser.com/ProductDetail/TE-Connectivity-DEUTSCH/CPE1633F0000?qs=%2Fha2pyFadujhgEPuKN2zpdU7hxXGhxi42FIA7IJ97C%252BgTcNn%252Bd18nQ%3D%3DFrom DEUTSCH, which merged with TE in 2012...Looks like the CPE1633F0000Extra linkhttps://www.te.com/usa-en/product-ZPF000000000112118.html
mystery component - Page 1
Forum section: electronics / projects

author: grouchobyte
author_rank: Regular Contributor
timestamp: September 29, 2018, 03:14:35 pm
content: Anyone wanna guess what this is? It had me stumped for a while......

author: Twoflower
author_rank: Frequent Contributor
timestamp: September 29, 2018, 03:26:54 pm
content: That's a glass delay line. Dave had a video about it:
Mystery component in air conditioner? (Something to do with condensate release?) - Page 1
Forum section: electronics / projects

author: rs20
author_rank: Super Contributor
timestamp: September 05, 2020, 07:55:13 am
content: Folks,The attached picture is taken by a phone I stuck right inside the condenser part of a window-mount air conditioner. The big solenoid-looking contraption in the centre of the image is what I'm wondering about. To its right is that rubber thing; I believe that if the water rises high enough to enter that hole in the top, it drains straight out of the unit (when viewed from below, that hole goes clear through the unit. IIUC, it is desirable to let the water build up so that it can evaporatively sub-cool the condenser.) I assume maybe the rubber thing on the right though is only there as a fail-safe in case the solenoid-looking thing fails to open.So the solenoid-looking thing (the thing that I'm asking what it is), has a corresponding hole in the bottom of the unit, but that rubber cone bit is pressed quite firmly into that hole, thereby preventing any water from escaping. What I don't get, though, is that I am 99% sure there aren't any wires leading to the solenoid-looking thing, so it can't be a solenoid. So what is it, and how is it powered?The only (totally speculative) theory is that it might be some clever contrivance that retracts the rubber cone when it gets below a certain temperature. I presume in cold weather, you don't want water hanging around and possibly freezing? I'd be impressed/surprised if it'd be such an issue that they would dedicate a separate line item/device for that, though.(On the slim chance my guess is correct, I'd still like to know what the device is called.)

author: rs20
author_rank: Super Contributor
timestamp: September 05, 2020, 08:09:51 am
content: Well, as is standard, the act of formulating a question to ask it gave me ideas on how to figure this out myself. And lo:http://www.fstbhy.com.cn/displayproduct.html?proID=2122391
Mystery component - Page 1
Forum section: electronics / projects

author: grouchobyte
author_rank: Regular Contributor
timestamp: March 24, 2017, 09:52:52 pm
content: Anybody have a clue what this is? No, its not a diode but the envelope it was in gives us a clueMy guess is an old tech g-sensor, before the accelerometer chip@grouchobyte

author: SingedFingers
author_rank: Frequent Contributor
timestamp: March 24, 2017, 10:33:49 pm
content: Mercury tilt switch?Edit: stick it across a DVM in ohms mode and shake it.

author: grouchobyte
author_rank: Regular Contributor
timestamp: March 24, 2017, 11:20:09 pm
content: Quote from: SingedFingers on March 24, 2017, 10:33:49 pmI did that and if in fact it was a mercury tilt switch, why would it only conduct when shaken, not just gently and slowly tilting it? There seems to be a force or g dependency@grouchobyte

author: DaJMasta
author_rank: Super Contributor
timestamp: March 24, 2017, 11:24:28 pm
content: I think it's a mechanical vibration/tilt sensor. Basically, two electrical contacts and a ball bearing in a can. When there's enough force to shake the ball, it makes contact.If the output is analog at all, then it's not this, but if it's digital noise then it's probably at least akin to one of these.

author: CatalinaWOW
author_rank: Super Contributor
timestamp: March 25, 2017, 04:02:29 am
content: Just to clarify a ball bearing on a spring in a can. With one lead the can, the other the spring. Though if it really was a .23 g sensor turning it sideways in a 1-g field should close the contact. Maybe .23 gs at the resonant frequency of the ball spring system. These things would have a relatively high q.

author: CJay
author_rank: Super Contributor
timestamp: March 25, 2017, 08:02:41 am
content: Yes, vibration sensor, I've seen these before, I think available from Maplin until recently.The writing may be a red herring, it's not unknown for people to jot notes on whatever piece of paper was to hand, or it may be related to the part, dunno.

author: SeanB
author_rank: Super Contributor
timestamp: March 25, 2017, 08:30:33 am
content: Position independent vibration sensor, basically a small metal ball soldered to a spring, so that it only makes contact with the case when shaken, but is otherwise not going to make contact however the position of the casing. Common in things like suitcase alarms, which need to be able to do off, and not to need you to have the case in a particular orientation before arming them.
Mystery Components - Page 1
Forum section: electronics / projects

author: NivagSwerdna
author_rank: Super Contributor
timestamp: January 05, 2018, 11:53:07 am
content: I'm looking at aschematicthat has FDN310P (replaceable by A1HSB)... it appears to be a 5V logic level P channel mosfet...But... Why doesn't a FDN310P datasheet appear in a google search? A1HSB likewise?

author: Nusa
author_rank: Super Contributor
timestamp: January 05, 2018, 02:08:38 pm
content: Probably because someone misread it when they copied FDN340P off some other arduino board schematics.

author: NivagSwerdna
author_rank: Super Contributor
timestamp: January 05, 2018, 02:32:45 pm
content: Quote from: Nusa on January 05, 2018, 02:08:38 pmThe actual device seems to have A1sHB markings. SI2301DS ?

author: Inverted18650
author_rank: Frequent Contributor
timestamp: January 05, 2018, 03:50:56 pm
content: I checked LCSC and found this:https://lcsc.com/search?q=a1shbThe datasheet for it is mostly Chinese:https://datasheet.lcsc.com/szlcsc/A1SHB-SI2301_C86773.pdf

author: Zero999
author_rank: Super Contributor
timestamp: January 05, 2018, 11:48:10 pm
content: Why do you want to know? Are you building that circuit or repairing it?There's nothing special about that MOSFET. Just choose something which has a maximum drain-source voltage of over 7V, can pass >500mA with a gate voltage of 5V and negligible voltage drop.I've just had a quick look through Mouser and found: NTR3A052PZ PMV65XP & PMV30XPEA. There are many more.http://www.mouser.com/ds/2/308/NTR3A052PZ-D-1219532.pdfhttp://www.mouser.com/ds/2/302/PMV65XP-1146549.pdfhttp://www.mouser.com/ds/2/302/PMV30XPEA-1151648.pdf

author: NivagSwerdna
author_rank: Super Contributor
timestamp: January 06, 2018, 07:01:06 pm
content: Quote from: Hero999 on January 05, 2018, 11:48:10 pmNeither. I have some of them left over which I previously gutted for the processor etc (a very cheap way to get a collection of parts) and I need a high side load switch... and that PFet looks perfect.

author: Inverted18650
author_rank: Frequent Contributor
timestamp: January 06, 2018, 07:26:09 pm
content: I gather a lot of parts in the exact same fashion. Lately I've been checking eBay for "scrap circuit boards" and the like and have found some great chips.
Mystery connector identification - Page 1
Forum section: electronics / projects

author: Teuobk
author_rank: Contributor
timestamp: May 02, 2018, 04:40:31 pm
content: Hi everybody,I'm trying to identify a connector with unusual pins from a piece of video game hardware from the mid-late 1980s. I'm hoping you can help me identify the part number or at least the language to properly describe it. The end goal is to find a source of several thousand of the female connectors.Roughly speaking, it's a four-position, 2.00 mm pitch connector. The male side is free hanging on individual wires of about 28 ga, and the female side is a through-hole mount. The pins themselves are unusual: they seem to be something like fork pins on the male side and appear to grab the contacts on the female side. There are tabs/partial-shrouds on the top and bottom of the male side and on the left and right of the female side.There are no markers on the female connector.On the male connector, there are pin numbers, what might be either "I9" or "6I", and the stylized text "AMP", which I think might be a very old Amphenol logo.Any ideas?Here are a bunch of photos. First, the female connector:The male connector:Some measurements of the female connector:Thanks!

author: helius
author_rank: Super Contributor
timestamp: May 02, 2018, 05:24:23 pm
content: AMP became Tyco which is now called TE. It has never been the same thing as Amphenol.You can search TE's connectors parametrically atwww.te.com, but the specific connector you have may be a discontinued series; that contact style is unusual.

author: Teuobk
author_rank: Contributor
timestamp: May 02, 2018, 07:02:25 pm
content: Quote from: helius on May 02, 2018, 05:24:23 pmThanks, that's very useful. Knowing it was AMP and not Amphenol gives me a new avenue for searching old catalogs and such.
Mystery connector - Pancon "HALLcon" - Page 1
Forum section: electronics / projects

author: ebastler
author_rank: Super Contributor
timestamp: April 04, 2020, 09:25:42 am
content: I bought this very nice miniature flow sensor for a project, the "Digmesa Nano":https://www.digmesa.com/wp-content/uploads/2015/11/digmesa-nano-en-lrint.pdfBut annoyingly I can't find a suitable connector for it. The sensor datasheet describes it as a "Pancon HALLcon" 3-pin connector. But while Pancon is a well-known brand, the only references to a "HALLcon" connector series Google brings up for me are from this Digmesa sensor. And I couldn't find any similar-looking Pancon connectors under other names either.Is this connector series known under some other name? I have attached a picture of the flow sensor, and two pictures of the connector body as shown in the Digmesa flyer. The pin pitch is 2.54 mm. Many thanks for any hints you might have!

author: ebastler
author_rank: Super Contributor
timestamp: April 05, 2020, 08:28:57 am
content: I'll bump this up, just once, promised!Maybe I am out of luck here? I have now found a more detailed datasheet (in German) which suggests that you can only buy this sensor complete with the plug -- either with or without wires attached. So maybe it's indeed a custom plug which Pancon makes for Digmesa only? Unfortunately the only vendor I found for the sensor is selling it as a spare part for coffee machines (Gorenje), and is selling the bare sensor only.https://www.digmesa.com/wp-content/uploads/2015/09/93N-6211_1100x_D.pdf

author: Siwastaja
author_rank: Super Contributor
timestamp: April 05, 2020, 09:45:07 am
content: Is that so that a datasheet for the part does not exist? If you can't find it from the distibutor, maybe contact the manufacturer? What you have linked here clearly is some kind of marketing brief pdf, not the actual datasheet. (Or I really hope so!)

author: ebastler
author_rank: Super Contributor
timestamp: April 05, 2020, 02:36:39 pm
content: The link in my second post is to a more substantial datasheet for the sensor. But again, no details on the plug beyond the "Pancon Hallcon" name. And the information that they sell the sensor in two different configurations, both of which include a plug -- so it may be a custom part.Pancon, the plug manufacturer, has a rudimentary German website (http://www.pancon.de/html/uber_uns_-_about_us.html) and an international website which has been "currently unavailable" for the last days (https://panconcorp.com/). I have checked various distributors, but none of them seems to carry this kind of plug.
Mystery IC description - Epson D13A0500B1 - Page 1
Forum section: electronics / projects

author: nexus
author_rank: Regular Contributor
timestamp: January 17, 2023, 04:49:13 am
content: Hi all,Working on a piece of equipment (Agilent N1911A power meter) that has an intermittent display flicker. While I'm recrimping all ribbon cables, reflowing all display connectors, replacing the DS90 series LVDS drivers, I also saw this Epson IC near the LVDS transmitter on the motherboard. No idea what it is, tried searching for it on all the usual websites.Any idea what the heck this Epson BGA is? Microcontroller, display related, etc? If its display related I will reball it, just to be sure there are no corroded/intermittent connections.Cheers

author: gamalot
author_rank: Super Contributor
timestamp: January 17, 2023, 05:23:54 am
content: Here you are:https://vdc.epson.com/display-controllers/lcd-controllers/s1d13a05/

author: nexus
author_rank: Regular Contributor
timestamp: January 21, 2023, 05:35:06 am
content: Thanks for that. I went ahead and reballed this part. Also replaced the LVDS transmitter on the mobo and the matching receiver on the front panel. Also recrimped front panel ribbon and bought a new LCD module (Sharp LQ038Q5DR01). Display is now clear and flicker free.Unit seems to be fully functional, but developed a new self test error. "Test Point Voltages - Fail" which according to the service manual "Checks that all of the supply voltages are present". No further detail in manual or on unit after self test. Is it that hard to actually report which voltage rail is failing the test?!The main power supply (off board) is brand new so I doubt that is the issue. What's odd is that everything seems to work, including the calibrator and when an actual power sensor is plugged in.All test points on the board also are fine (+12V, +5V, +3V3, -5V). Now I need to do a shotgun replacement of all the linear and switching controllers on the mobo (2 LT 1086s and 1 MAX774). The 1086s were pretty close to the rework area for that BGA, so maybe something was affected even though I was careful with the heat.Why can't it ever be easy?
Mystery inductors inside failed 12 year old Thomson DVR (HDD/DVD PLAYER/REC) - Page 1
Forum section: electronics / projects

author: GrandTheftAuto4life
author_rank: Contributor
timestamp: July 14, 2021, 06:24:45 am
content: Hello. I'm curious about these strange inductors.Schematic Symbol:(yes, there is actually a service manual for this thing, can you believe it?)(model number: DTH-8550H - PATA/IDE based system, ZORAN being the choice for the dual BGA system processor)There is a couple more of these inside my failed device.I've gutted the vfd, hdd (WD Caviar 160GB) and some power resistors and a heatsink from this machine as I currently have more use for those separately.(Few months ago my cable-TV provider stopped providing analog service, making this machine partially useless and i very rarely recorded anything anyway)

author: coromonadalix
author_rank: Super Contributor
timestamp: July 14, 2021, 07:25:50 am
content: Seen tons of them in electronic stuff, i find them cute lollAnd you can decipher their color coding ...

author: GrandTheftAuto4life
author_rank: Contributor
timestamp: July 14, 2021, 08:05:46 am
content: Quote from: coromonadalix on July 14, 2021, 07:25:50 amI have never seen them before

author: Gyro
author_rank: Super Contributor
timestamp: July 14, 2021, 10:27:03 am
content: Quote from: GrandTheftAuto4life on July 14, 2021, 08:05:46 amProbably because they are more often used in analogue signal paths, filters etc. than supply filtering.

author: TheMG
author_rank: Frequent Contributor
timestamp: July 14, 2021, 01:33:58 pm
content: Right. They are small inductors that are not rated to handle much current.It was very common to find these in analog TVs, VCRs, radio receivers, etc. Sometimes you'd find them in very small SMPS like on the primary side of a phone charger. Also lately I've seen them used for EMC filtering in a lot of LED bulbs.

author: TimFox
author_rank: Super Contributor
timestamp: July 14, 2021, 01:42:38 pm
content: Small leaded inductors such as this typically have a form-factor that is skinnier (longer and smaller diameter), but the color code agrees with the schematic drawing.
Mystery meat 2- and 3-pin soft starter modules - Page 1
Forum section: electronics / projects

author: 5U4GB
author_rank: Super Contributor
timestamp: May 02, 2023, 02:01:32 pm
content: I've got some gear like table saws and planers where I'd like to reduce both the kick and inrush current, and the obvious solution is one of the vast number of mystery-meat 2- and 3-pin soft starters available from places like Aliexpress and eBay, things likethis. In particular one of the items, a mitre saw, has close to zero space to fit anything so even the smaller 2-pin device is going to be a challenge to install.Does anyone know what the difference is between the 2- and 3-pin devices? Given the tiny size I assume there's not much more than a thermistor in there, but why 2 vs. 3 pins, and is there any inherent drawback to the 2-pin form?

author: Jeroen3
author_rank: Super Contributor
timestamp: May 02, 2023, 02:17:18 pm
content: I suspect these are all thyristor dimmer based soft starters. A two wire one will never be 100% on because it needs to shunt a small bit of current during off-time for it's own supply.Or the two wire is just a passive ptc.

author: 5U4GB
author_rank: Super Contributor
timestamp: May 02, 2023, 02:48:12 pm
content: Quote from: Jeroen3 on May 02, 2023, 02:17:18 pmThat's what I suspect for those ones since they're something like 30x20mm which doesn't leave room for much but a thermistor. Which would unfortunately make them useless for a mitre saw because that'll typically be used for repeated cuts with little to no time to cool off between cuts.
Mystery oscillator - Page 1
Forum section: electronics / projects

author: willie_phistterbut
author_rank: Newbie
timestamp: May 28, 2017, 07:42:12 pm
content: Recently received a package of components from Ebay. Inside were a number of decent caps, connectors and grab bag style random junk. Some of note are these 25.175 Mhz oscillators marked Saronix 9316P 197-0565E. Can't find much info on it. If anyone has info or project ideas for them let me know.

author: bktemp
author_rank: Super Contributor
timestamp: May 28, 2017, 07:52:17 pm
content: Why mystery?It seems to be a common 14 pin crystal oscillator, probably operating at 5V and outputting 25.175MHz.25.175MHz was the video clock for 640x480 VGA resolution. That matches the 1993 datecode 9316P.Saronix is now part of Diodes Inc:https://www.diodes.com/products/connectivity-and-timing/crystal-and-crystal-oscillator/

author: Ian.M
author_rank: Super Contributor
timestamp: May 28, 2017, 08:14:29 pm
content: Edit: BKtemp beat me to itThat's the pixel clock frequency for VGA 640x480, 60Hz. From the date code, and the lack of any info for a Saronix 197 series it was probably custom ordered by a VGA card manufacturer in the early '90's then ceased being used some years later , possibly due to the introduction of frequency synthesis techniques allowing multi-mode card designs to get rid of the array of crystals they used to have.To do: output a VGA video signal from a PIC, or possibly an over-clocked AVR
Mystery part: 7201 - Page 1
Forum section: electronics / projects

author: dobsonr741
author_rank: Frequent Contributor
timestamp: May 16, 2024, 02:47:56 pm
content: I have a TO18 transistor-like device removed from a 1970 intersil stopwatch board (featuring ICM7045). Looking at intersil data books I did not see anything with 7201. What could it be? Here's the pics - the logo seems to be intersil.

author: RoGeorge
author_rank: Super Contributor
timestamp: May 16, 2024, 03:07:25 pm
content: Probably an Intersil ICM7201?https://www.ebay.com/itm/176162506867https://pdf1.alldatasheet.com/datasheet-pdf/view/331416/INTERSIL/ICM7045.htmlpage A-4 of the pdf mentions ICM7201 as obsolete.

author: Andy Watson
author_rank: Super Contributor
timestamp: May 16, 2024, 03:20:37 pm
content: Quote from: RoGeorge on May 16, 2024, 03:07:25 pmYes, very probably.Try here:http://messui.polygonal-moogle.com/sch/index.htmlDatasheet of ICM7201 Low Battery Voltage Indicator

author: dobsonr741
author_rank: Frequent Contributor
timestamp: May 16, 2024, 03:41:20 pm
content: This is it! Thanks all!
Mystery Part - Page 1
Forum section: electronics / projects

author: Zyvek
author_rank: Regular Contributor
timestamp: September 17, 2010, 07:31:16 pm
content: I have a handful of these parts, TO-220 case with the following numbers:TB435O '06I've Google'd to no avail, I know they are old so that's probably part of the problem. Anyone here able to identify them? Thanks!

author: Zero999
author_rank: Super Contributor
timestamp: September 17, 2010, 07:33:26 pm
content: Have you tried testing it with a diode tester?

author: DJPhil
author_rank: Frequent Contributor
timestamp: September 17, 2010, 07:34:47 pm
content: Finally, an easy one! (I think)PNP BJThttp://www.datasheetcatalog.org/datasheet/WINGS/2SB435.pdfDatasheetcatalog rules.

author: Zyvek
author_rank: Regular Contributor
timestamp: September 17, 2010, 08:07:35 pm
content: Quote from: DJPhil on September 17, 2010, 07:34:47 pmWow, Thank you!
Mystery SOP-16 IC, 369-2040B - Page 1
Forum section: electronics / projects

author: Deactivated-1
author_rank: Frequent Contributor
timestamp: May 02, 2023, 02:24:10 pm
content: couldnt find any info of this ic, its from the board of an old UPS, next to it is the microcontroller which is a 72c215g2m5it connects to the drive fet gates.

author: eutectique
author_rank: Frequent Contributor
timestamp: May 02, 2023, 04:07:56 pm
content: googlegives40 thousandhits.https://octopart.com/369-2040b-on+semiconductor-2247802

author: amyk
author_rank: Super Contributor
timestamp: May 03, 2023, 12:21:27 am
content: Custom-marked SG3525? Does pinout match?

author: Swainster
author_rank: Frequent Contributor
timestamp: May 04, 2023, 05:28:10 am
content: Not that much help, but I suspect that this is a Cherry Semiconductor part (bought over by Onsemi in 2000), so perhaps the only way to find info on it would be to purchase an old Cherry Semi databook from eBay