hybridfree/eevblog-posts huggingface dataset:
Do you recognise this part? - Page 1
Forum section: electronics / projects

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: October 27, 2018, 08:27:50 am
content: Hi,It's used for 2S Li-ion protection, the PCB marking is PCM-LX2SBA-3316 and on top of U3 it's written 3J39Do you have any Idea?

author: SiliconWizard
author_rank: Super Contributor
timestamp: October 27, 2018, 07:23:13 pm
content: Not sure what your question is.It's a PCM board with most likely B+ and B- going to the battery + and - (2 cells in series, with the middle point probably on the central pad marked BM1?) and P+/P- being the output pins. But you probably already knew that.From the form factor, it looks like a PCM made for a 2x18650 pack. Very similar to this:https://www.ebay.com/itm/2S-4A-7-4V-Li-ion-Lithium-18650-BMS-PCM-Battery-Protection-Board/183476226508http://www.all-battery.com/pcbfor74vli-ion186501850072vbatterypacks8alimit-32004.aspxBut not quite the same. Obviously hard to derive the exact specs then (max charge/discharge current).

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: October 28, 2018, 05:55:26 am
content: Thanks, I want to know the main controller part number.

author: abyrvalg
author_rank: Frequent Contributor
timestamp: October 28, 2018, 08:41:32 am
content: Many ebay/ali LiIon protection boards utilize ICs made by Ablic. Try matching the pinout with this:https://www.ablic.com/en/doc/datasheet/battery_protection/S8252_E.pdf

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: October 28, 2018, 11:40:39 am
content: Thanks
Do you recognise this plug? - Page 1
Forum section: electronics / projects

author: robzy
author_rank: Regular Contributor
timestamp: September 18, 2023, 11:45:45 am
content: Seems to be a plug used for old Bang & Olufsen audio gear. Does anyone recognise it?My searches of DigiKey and Mouser are coming up empty. Clearly a Molex, but Molex make so many connectors!

author: larsdenmark
author_rank: Regular Contributor
timestamp: September 18, 2023, 12:18:08 pm
content: It looks like this one:https://sound-affair.com/bang-and-olufsen-product/masterlink-cables/and/or this one:https://www.bosscom.dk/products/details?id=179More stuff here:https://radioogtveksperten.dk/tilbehoer-44/kabler-55/masterlink-77/

author: robzy
author_rank: Regular Contributor
timestamp: September 18, 2023, 12:29:02 pm
content: Indeed, it is the Masterlink plug, but I'm hoping to find a generic source for them. Might not be possible, though.

author: klr5205
author_rank: Regular Contributor
timestamp: September 18, 2023, 12:38:13 pm
content: I can't zoom in far enough to read it myself, but if you find the datasheet for the die in the rectangular crimper, it will probably list all the compatible connector series. That should narrow your search considerably...

author: robzy
author_rank: Regular Contributor
timestamp: September 18, 2023, 12:47:41 pm
content: You'd think so, but the crimper on the left is Molex 69008-1171 which is loaded with a Molex 69008-1172 die.... and that just leads to dead end series.

author: robzy
author_rank: Regular Contributor
timestamp: September 18, 2023, 12:53:29 pm
content: Okay. I think I have a lead. I fed them into Google Image Search, which noticed that they're kind of similar to an RJ45 connector.I head to DigiKey and find these coming up for Modular Connector Plugs with 16 positions....https://www.digikey.com.au/en/products/detail/te-connectivity-amp-connectors/5-520424-6/2311000However they are quite expensive and not readily available. Time to search more to see if I can find them in single quantities.

author: robzy
author_rank: Regular Contributor
timestamp: December 10, 2023, 11:04:40 am
content: A note for people finding this on Google - it might be similar to the connector on this IBM keyboard:https://youtu.be/vdP_sTMOWYo?t=88
Do you recognize these parts? - Page 1
Forum section: electronics / projects

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: February 04, 2021, 11:39:09 am
content: Hi,Do you recognize these few Active parts? they are used in a Delta temperature controller, I think they are used for The Sensor input.

author: glentek
author_rank: Regular Contributor
timestamp: February 04, 2021, 09:57:29 pm
content: ED1 AD converter ADS1110https://www.ti.com/lit/ds/symlink/ads1110.pdf?ts=1612475172292C13772 - probably an opamp

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: February 06, 2021, 08:06:39 am
content: Thanks for the point, what about the other parts?
Do you recognize this chip? - Page 1
Forum section: electronics / projects

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: December 19, 2021, 01:07:04 pm
content: Hi,I think it it may be an Application processor , Do you know the manufacturer and datasheet? or it's something else?

author: coromonadalix
author_rank: Super Contributor
timestamp: December 19, 2021, 01:27:30 pm
content: Would be nice to know in what it is used, a car radio ? Stereo system ?The bm8563 is a RTC, so this chip seems to drive an lcd, if i guess the long connector traces going to the ic ??And the dosilicon chip is an i2c potentiometerSeems a rebranded chip to hide the real numbers ??

author: Fraser
author_rank: Super Contributor
timestamp: December 19, 2021, 02:07:33 pm
content: As already stated, that looks like a OEM marking as no date or batch codes. It would really help your cause if you included details of the equipment that this PCB resides in and a larger view of the PCB as that can assist in identifying function and possible candidates. Why you think this IC is the cause of your issues is also helpful information.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: December 19, 2021, 02:09:55 pm
content: I don't know, but here's a fun list of crystal frequencies and their useshttps://en.wikipedia.org/wiki/Crystal_oscillator_frequenciesAlthough that crystal seems to be related to circuits not shown. But who knows!

author: Bud
author_rank: Super Contributor
timestamp: December 19, 2021, 03:12:02 pm
content: 24.0 MHz is often used for USB.

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: December 19, 2021, 03:18:33 pm
content: It's used inside a home Iphone monitor, and I think it's connected to the LCD too.
Do you recognize this logo? - Page 1
Forum section: electronics / projects

author: Wimberleytech
author_rank: Super Contributor
timestamp: July 09, 2022, 12:19:13 pm
content: The date code indicates Feb 1982 but I do not recognize the logo. In that time frame, there were lots of little custom shops doing gate arrays and such, so this could have been a small company that came and went.Any guesses??This is a chip with a crystal oscillator and divider down to 1Hz and a coil driver...based on the application.

author: mclute0
author_rank: Regular Contributor
timestamp: July 09, 2022, 08:41:50 pm
content: looks familiar, but rings no bell... I want to say it is not an e but a swept P, maybe..look around in here or from other years maybe..https://archive.org/details/bitsavers_unitedTechngineersMasterVol2_242068752/page/n389/mode/2up?view=theater

author: Wimberleytech
author_rank: Super Contributor
timestamp: July 09, 2022, 09:08:45 pm
content: Could be. I thought, maybe a "c"

author: mclute0
author_rank: Regular Contributor
timestamp: July 09, 2022, 09:27:49 pm
content: try Ceramate Technical, kinda similar

author: Wimberleytech
author_rank: Super Contributor
timestamp: July 09, 2022, 09:41:51 pm
content: Yes, I saw that. But there is an arrow in reverse image on that logo which I cannot see in my image, so I figured it was not a hit. Thanks for looking though!!

author: magic
author_rank: Super Contributor
timestamp: July 09, 2022, 10:02:35 pm
content: For the record, somebody posted a short list of various lists of IC manufacturer logos available on the Internet.https://www.eevblog.com/forum/beginners/opamp-chip-identification/msg3952118/#msg3952118But I can't find this logo there; clearly it has to be something even more obscure than Analog Systems.

author: Wimberleytech
author_rank: Super Contributor
timestamp: July 09, 2022, 10:11:08 pm
content: Well, I was the charter member (employee #2) of a small fabless IC company back in 1980. We stamped our custom chips with our logo that looked like the state of Texas. Trust me...you will never see that logo in any list. I suspect this logo I am trying to identify is in the same category of companies!

author: Colt45
author_rank: Contributor
timestamp: July 09, 2022, 11:47:29 pm
content: Quote from: Wimberleytech on July 09, 2022, 10:11:08 pmI feel like that's been done before?

author: Wimberleytech
author_rank: Super Contributor
timestamp: July 10, 2022, 01:21:39 am
content: Yup, that is why we changed our name to Crystal Semiconductor.

author: magic
author_rank: Super Contributor
timestamp: July 10, 2022, 06:01:10 am
content: Quote from: Wimberleytech on July 09, 2022, 10:11:08 pmWell, good luck thenIt has occurred to me that the letter could also possibly be lower case 'l'. My first thought was 'e', like yours. It doesn't really look like 'c' IMO.
Do you recognize this part? A7001 - Page 1
Forum section: electronics / projects

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: July 01, 2019, 07:28:50 am
content: Hi,This is an optical isolated RS232 converter from ABB, it's broken for now and I want to replace the parts on it, I could figure out all the things expect this mystery chip with A7001 markings.Do you recognize this part?

author: calmtron
author_rank: Regular Contributor
timestamp: July 01, 2019, 07:53:53 am
content: HSDL-7001

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: July 01, 2019, 08:33:56 am
content: Thankswhere can I find it? is there any new replacement part?Also I think the IR transceiver is TFDU4101, here is the markings, is it a right guess? the marking is 4101 84D
Do you recognize this part? - Page 1
Forum section: electronics / projects

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: July 11, 2019, 08:49:53 am
content: Hi,This is one of the cheapest 7w led lamps(230Vac) that I could have found, I was curious what is inside, it's just a MB10F bridge a 47 ohm series resistor and a 390 ohm series resistor and 7 1W led, there is one 3 pin package inside the loop, is it a constant current one!? do you recognize it? it's marking is J2101S, is it something like LM317 a cheap chinese version?

author: JackJones
author_rank: Regular Contributor
timestamp: July 11, 2019, 09:24:22 am
content: It does look like a constant current driver, they usually are. I did find this page about it:https://www.alibaba.com/product-detail/Factory-good-quality-3W-TO-5W_62066419259.html?spm=a2700.7724838.2017115.1.bac05b1d4KfoSN

author: amyk
author_rank: Super Contributor
timestamp: July 11, 2019, 12:07:42 pm
content: Yes, it's a current regulator. See the YouTube bigclivedotcom channel for lots of videos of LED lamps with this style of circuitry.7 LEDs in series seems a little low, unless each one itself has multiple die in series inside, because linear regulators dissipate a lot of heat and are thus usually used for strings of >200V for a 240V line voltage.

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: July 12, 2019, 08:32:24 am
content: Thanks
Do you recognize this puppy? - Page 1
Forum section: electronics / projects

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: August 24, 2017, 12:59:44 pm
content: Hi,Do you know this part?

author: CJay
author_rank: Super Contributor
timestamp: August 24, 2017, 01:01:15 pm
content: some kinda three phase IGBT pack probably, there'll be a part number somewhere if you desolder it

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: August 24, 2017, 01:06:52 pm
content: Thanks, who made these? maybe by the size we can recognize it?

author: noidea
author_rank: Unknown
timestamp: August 24, 2017, 02:37:40 pm
content: The part number will be on the underside you will have to de solder it or cut it off the board to have a look.

author: daqq
author_rank: Super Contributor
timestamp: August 24, 2017, 03:44:30 pm
content: Looks like this:http://uk.farnell.com/fairchild-semiconductor/fsbb20ch60f/ipm-igbt-20a-600v-spmca-027/dp/2322642That said, more manufacturers make similar ones. Without desoldering it and looking at the number you can't be sure.

author: shved
author_rank: Regular Contributor
timestamp: December 19, 2019, 11:22:29 am
content: Filter through Infineon, IR, etc. catalogs, you will find it. I've seen amateur VFD project using those modules in some Russian forum, and i don't remember witch one. I remember that microcontroller firmware was closed source and guarded by the author, so i wasn't interested any more.Hope that helps.

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: December 19, 2019, 01:42:48 pm
content: QuoteDo you have any info?

author: shved
author_rank: Regular Contributor
timestamp: December 19, 2019, 01:55:29 pm
content: Unfortunately i can't find the forum thread with DIY VFD. But I've searched some Russian sites and found possible match: FSBB30CH60 .https://www.chipdip.ru/product/fsbb30ch60It seas that this is obsolete component.I think you should browse some more shops and catalogs.
Do you recognize this transistor? - Page 1
Forum section: electronics / projects

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: September 28, 2023, 05:03:23 pm
content: HiDo you recognize this transistor? I can not find any thing on C8918

author: TimFox
author_rank: Super Contributor
timestamp: September 28, 2023, 05:18:19 pm
content: I believe "8918" is the transistor manufacturer's date code: 18th week of 1989.The "1848-4394" is the "private" code assigned by the instrument's manufacturer for his order with the transistor manufacturer.Is this an -hp- unit?

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: September 29, 2023, 07:06:22 pm
content: Thanks Timfox for the tip, do you have any datasheet or suggestion replacement for this part?My customer sends it, I should ask them about it to see if it's hp,

author: TimFox
author_rank: Super Contributor
timestamp: September 29, 2023, 07:08:46 pm
content: Quote from: ali_asadzadeh on September 29, 2023, 07:06:22 pmI looked for that eight-digit number, but could find nothing useful.If you know the manufacturer of the unit (the first four digits may not be -hp-), you might find an appropriate index online for that company.

author: coppice
author_rank: Super Contributor
timestamp: September 29, 2023, 07:18:13 pm
content: PRX should be Powerex. Consider that any semiconductor marked C plus 4 digits might mean 2SC plus those 4 digits. However, in this case I think Tim is right. 8918 is the date, and 1848-4394 is probably a customer specific code for a customised part. HP being the likely candidate.

author: floobydust
author_rank: Super Contributor
timestamp: September 29, 2023, 07:18:55 pm
content: Thread is not useful without a model # or make

author: schmitt trigger
author_rank: Super Contributor
timestamp: September 29, 2023, 07:26:00 pm
content: Many electronic designs employ catalog semiconductors screened to a particular performance specification. If you are a large enough customer, semiconductor vendors will gladly do that for you and write on the transistor your own house number.I even worked for a company which purchased close to 100,000 power transistors per week. In that instance, the vendor actually tweaked the process of a catalog item in order to better meet our specific requirements. And obviously, it had a house number.
Do you see a market for this (750W boost converter) - Page 1
Forum section: electronics / projects

author: Siwastaja
author_rank: Super Contributor
timestamp: July 24, 2019, 12:47:09 pm
content: Hi,As a side project, I had to design a boost converter with the following specifications. For some reasons feelings-based, I designed it manufacturability in mind so not as an one-off.Vin = 19..30VIin = 35A maxVout = 46..74V, adjustable from a single 3V3 GPIO pin (or any voltage source between 0V and +3V3, can be just grounded for 74V)Iout=11A maxPout=750W maxEfficiency around 96-97%Adjustable input current limit (fault detection threshold) 19..35ASlow output rampup (1 second)Enable inputPower good status outputPassive cooling, complete aluminium casing with no holes except for inputs/outputsOvertemperature protectionApprox. 110x150x45mm with the heatsinks.Four-phase design. Switch node only overshoots by 17% without snubbers.Now this was developed for our internal use in our own products, to run 110V vacuum cleaner brushed universal motors, just below the EU extra low voltage limit.Do you see any point in commercializing it as a separate module? Does anyone see any use for such a DC/DC converter? Would you pay $300-400 for such a unit?

author: kosine
author_rank: Regular Contributor
timestamp: July 24, 2019, 01:42:15 pm
content: There are probably lots of potential applications, though I suspect you'd need to get the price down.I've discussed a couple of projects with manufacturers in the last year or so where they've been trying to develop battery powered equivalents to existing mains or petrol engine powered products. Can't go into specifics, but one issue involved needing more voltage than they could get from a standard battery pack. There are apparently shipping restrictions above 48V, so their work-around solution was to ship customers two 48V batteries separately...I suggested they look for a DC-DC convertor exacly along the lines of what you've developed. It might be worth you looking into the regulations to see where the limits are. Any company selling portable appliances that operate at the limit might be interested in a way of offering a more powerful solution.

author: ejeffrey
author_rank: Super Contributor
timestamp: July 24, 2019, 01:51:32 pm
content: I agree battery powered applications are the key, otherwise it would make more sense to me to be line powered.You could look into marine applications. Some propulsion motors might prefer to get a higher voltage from a 24 V marine lead acid battery. I'm not sure if that power rating would be sufficient.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: July 24, 2019, 04:15:32 pm
content: I've designed a module that's similarly rated, but the opposite direction, actually (bucking). If anyone is interested I can put you in contact with the customer.Tim
Do you think this is enough creepage for functional 120Vac? - Page 1
Forum section: electronics / projects

author: Jester
author_rank: Frequent Contributor
timestamp: February 25, 2022, 09:31:55 pm
content: I'm working on alow costboard that has a form C relay contact rated for 1A, @ 120Vac. There are only two terminal block positions available for the contact, a jumper allows selection of either NO or NC, this footprint is for that jumper.60950 shows 1.4mm minimum clearance and 1.5mm minimum creepageThe non-plated hole between the pads is 1.4mm. (no room for the standard 2mm slot). I'm trying to avoid the extra cost for non standard slotsThe shortest creepage measures out at 1.5mmThe minimum annular ring is 5mil.Obviously it's not ideal, but it should work, not sure how the safety agencies would view it?Thoughts?

author: uer166
author_rank: Super Contributor
timestamp: February 25, 2022, 09:53:25 pm
content: It depends on the specific standard that applies to you, but in my experience, for functional insulation specifically, there is no minimum creepage/clearance required,as long as you can short out the nets, and not create a dangerous situation. If you are seeking UL listing that is one of the tests they will do. If you have an upstream fuse, doing a short and blowing that fuse is normally not a problem.I personally would not have issues with that creepage/clearance, but also why not just put in a 1mm slot? That is usually free..Disclaimer: the above are generalizations that may or may not be applicable to your specific product/standards/legal requirements.

author: jonpaul
author_rank: Super Contributor
timestamp: February 26, 2022, 10:15:00 am
content: Consult your countries safety standards, eg UL, ETL, VDE, etc. for PCB and creep and strike spacing.Good practice requires 6 mm creep and strike as mains transients can be 3..12 kV.1.2 mm is dangerousJon
Do you use anti ESD zener diode on magnetc snap on circuit? - Page 1
Forum section: electronics / projects

author: Wilson__
author_rank: Frequent Contributor
timestamp: October 15, 2024, 05:20:59 pm
content: Smart watch and fitbits use contact points on casing and charging cable is magnetic snap on.Contact points are touching directly with human body.Do you use anti ESD protection circuit on these pins?Many thanks

author: Salitronic
author_rank: Contributor
timestamp: October 16, 2024, 08:24:16 am
content: If this is for a commercial product it will need to pass ESD testing and all user-accessible inputs/contacts will be subjected to a contact discharge test.If there is a relatively large capacitance behind those contacts you might get away without an ESD protection diode (though I would still put one in), but otherwise you almost certainly need an ESD protection diode. The ESD diode should be placed as close as possible to the external input/contact and a series resistor should be added between the ESD diode and the rest of the circuit to protect it from the high clamping voltage of the ESD diode.
Dockable project for C# Visual Studio 2010 - Page 1
Forum section: electronics / projects

author: DavidDLC
author_rank: Frequent Contributor
timestamp: January 30, 2015, 09:41:23 pm
content: Hi all, I want to create a dockable project on C#, I'm using Visual Studio 2010, any good articles out there ? A book ?Please guys help me with my issue.David.

author: BFX
author_rank: Frequent Contributor
timestamp: January 31, 2015, 11:35:00 pm
content: Try this ...https://www.devexpress.com/For me it's the best framework

author: elgonzo
author_rank: Unknown
timestamp: February 01, 2015, 12:00:45 am
content: What framework is your UI based upon. WinForms or WPF?For a commercial library, see Bfx' answer. (There are other commercial libraries with similar features and similar 3 or 4 digit prices, such as Telerik or Actipro)Free alternatives:WPF:AvalonDockWinForms:DockPanel SuiteQuoteOnline documentation and sometimes tutorials. Generally speaking, the commercial offerings usually provide superior documentation compared to the open-source/free libraries. However, it might be worth investing the time to google for some blog articles or tutorials regarding the free alternatives. (Especially check StackOverflow for questions+answers regarding the free libraries...)

author: DavidDLC
author_rank: Frequent Contributor
timestamp: February 04, 2015, 10:47:01 am
content: Thank you guys for your feedback.The framework is WinForms.David.
Does 2 mic malfuntioning ? - Page 1
Forum section: electronics / projects

author: Md Mubdiul Hasan
author_rank: Regular Contributor
timestamp: January 05, 2018, 07:02:34 am
content: Hello there,I am going to develop a circuit for audio power amplifier using,http://www.ti.com/lit/ds/symlink/lm48511.pdfLooking at the application circuit , I am using SD_AMP(pin5) input for Mic input at pin 16 IN+. Did -IN pin grounded.Trying to suppress noise at the circuit in attachment 2 in 300Hz-3kHz audio amplifier, usinghttp://www.ti.com/lit/ds/snas371c/snas371c.pdfaudio amplifier.Kindly, let me know whats wrong I am doing here in attachment 2.Do you think,1. Low frequency noise can be cancel properly?2. Does the 2 mic malfunctioning ?3. Discuss about its L and R signal from MIC.
Does a socket exist for these circuit breakers? - Page 1
Forum section: electronics / projects

author: alexthe5th
author_rank: Contributor
timestamp: July 23, 2020, 06:25:10 pm
content: Hey folks.I'm designing a circuit board for a flight simulator that's intended to trip an array of approximately 64 low-current circuit breakers, and the breakers themselves have 0.250" blade ("quick disconnect") terminals on the back, spaced 17mm apart. Below is an excerpt from the datasheet with the dimensions and a picture of one of the breakers.I was curious if a socket exists to allow me to plug these directly into a PCB (similar to a relay socket), since this would be a far better alternative to running a rat's nest of wires behind a panel. Unfortunately I haven't come across anything that would accommodate these. Just curious if anyone has any ideas or pointers? Searching the distributors (Digi-Key etc.) is a bit of a mess when it comes to looking for a specific type of connector that you don't know the name of.Thanks!

author: floobydust
author_rank: Super Contributor
timestamp: July 23, 2020, 06:38:11 pm
content: Keystonemakes PCB mount quick-fit terminals. Also oddball sizes but good for ideas asAutomotive blade fuse clips.These need a lot of force to remove/install (the breaker), so I would not make a board with too many, unless you first unscrew all the breakers on the strip, from the front panel to take out the strip.

author: Benta
author_rank: Super Contributor
timestamp: July 23, 2020, 06:38:54 pm
content: Vogt series 3867, specifically 3867F.6 or 3867W.2 depending on your preference for mount. Datasheet attached.No affiliation.

author: Berni
author_rank: Super Contributor
timestamp: July 23, 2020, 08:27:34 pm
content: Yep use individual blade terminals as suggested above.But do make sure you can plug them in/out one by one while disassembled and then install the whole thing as a unit, These terminals grab on with an impressive amount of force even for a single one. Putting like 20 of these on a board will generally grab so hard that you won't be able to pull it back off without damage.If you want a more permanent quick and dirty solution you can also just mill slots in your PCB and solder to the very end of the terminal directly down to a PCB pad around it.

author: Benta
author_rank: Super Contributor
timestamp: July 23, 2020, 09:04:55 pm
content: Quote from: Berni on July 23, 2020, 08:27:34 pmThis is true, which makes me believe that the 3867W.2 type is the best choice, as it doesn't have the dimple that locks the spade pin, but just relies on spring force.But it does demand extra PCB slot milling.
Does a two-stage MC34063 make sense? - Page 1
Forum section: electronics / projects

author: fabiodl
author_rank: Frequent Contributor
timestamp: December 30, 2021, 07:03:45 am
content: I would like to step up from 5V to 250V, maximum current consumption (at 250V) of 1.86 mA.I am thinking of using either one MC34063 or two in cascade, i.e. step up to 35V with the first and from 35V to 250V with the second.Does it make sense or is it better to just try to bring the voltage straight from 5 to 250?In theory, less stages = lower loss, but I wonder if a ratio of 50 is too high and a two stage design makes sense.

author: strawberry
author_rank: Super Contributor
timestamp: December 30, 2021, 07:25:04 am
content: 2mA gives flexibility so most likely notuse center tap inductor to double voltage

author: T3sl4co1l
author_rank: Super Contributor
timestamp: December 30, 2021, 07:51:19 am
content: It's a good reason to use a tapped inductor, or coupled inductors -- a small 240 to 5V supply will use such a transformer, just wire it in reverse. Nothing wrong with that.Also, ditch the 34063, it'll give an absolute best of, what, 60% efficiency, if that, at 5V? Any boost regulator or controller will do; LM3481, CS5171, various TPSxxxxx I don't know offhand and would have to shop for; etc.Tim

author: fabiodl
author_rank: Frequent Contributor
timestamp: December 30, 2021, 07:53:12 am
content: Quote from: strawberry on December 30, 2021, 07:25:04 amThank you, something likethisisn't it? I did not know this trick.I have some small transformers laying around, specifically thesePA0367A. Could I use them or would they likely induce oscillations/instabilities in the loop?

author: Kleinstein
author_rank: Super Contributor
timestamp: December 30, 2021, 11:46:31 am
content: A flyback transformer is OK. The boost converter with the tapped inductor similar to a flyback converter, just not isolated, but tucked to the boost converter output.

author: wraper
author_rank: Unknown
timestamp: December 30, 2021, 12:02:33 pm
content: Quote from: fabiodl on December 30, 2021, 07:53:12 amLink is a broken google search. For low input voltage you need something with MOSFET switch. MC34063 uses Darlington transistor which causes a large portion of input voltage lost on its voltage drop.

author: ledtester
author_rank: Super Contributor
timestamp: December 30, 2021, 02:48:16 pm
content: Quote from: wraper on December 30, 2021, 12:02:33 pmThe link should download the following app note onto your computer..."DC Input Boost Converters with IPS401(Boost – Tapped Boost – Flyback Topologies for LED Control Solutions)"
Does an inverting variant of the ULN2003 exist? - Page 1
Forum section: electronics / projects

author: Sjoertdb
author_rank: Contributor
timestamp: January 22, 2018, 08:20:53 am
content: Hello everyone,For a nixie tube project, we use the ULN2003 in combination with a zener diode connected to the COM-pin.However, we've made a mistake assuming that the BCD-> Decimal converter outputs an inverted signal.. Searching for a non-inverting variant of the BCD-converter doesn't really come up with something tooIn order to fix the issue we need an inverting replacement of the ULN2003 (Or a non-inverting variant of the BCD-> Decimal converter). Does such a chip exist? A couple of hours searching for this doesn't really come up with a solution.I hope you can help us. It is much appreciated!BCD Converter: 74HC42DDarlington Array used: ULN2003Sjoert

author: MarkF
author_rank: Super Contributor
timestamp: January 22, 2018, 09:07:36 am
content: I found theA2982SLWTR-Tat Digikey.It is a source driver. But like the ULN2003A, it's max voltage is 50V.

author: Sjoertdb
author_rank: Contributor
timestamp: January 23, 2018, 11:04:11 am
content: Thanks for your input, it's really appreciated! It is the chip that i need, but the diodes are reversed and the package ought to be a 16 pin SSOP..
Does anybody recognize this strange connector (manufacturer / type)? - Page 1
Forum section: electronics / projects

author: Pinkus
author_rank: Frequent Contributor
timestamp: October 11, 2024, 08:12:19 am
content: Hi there, does anyone know what the plug/socket in the photo is called? I hope it is not something proprietary.It is a bit like a XT90, though it is quite different (e.g. has another small pin inside)Outer dimensions: 18.1 x 7.0 mmDistance between the large contacts (center-center): 11mmInner diameter of the large contacts: 4.5mmAnybody has a hint for me? A type with matching dimensions with only the two large connectors would be fine too. I do not need the small middle socket.Thanks!

author: PA0PBZ
author_rank: Super Contributor
timestamp: October 11, 2024, 09:37:37 am
content: It doesn't really help but this is the only reference I could find:https://www.reddit.com/r/AskElectronics/comments/1cm6nrb/i_really_need_help_finding_this_plug_i_bought_the/

author: coromonadalix
author_rank: Super Contributor
timestamp: October 11, 2024, 11:00:27 am
content: maybe in theses ?https://www-elektromodellflug-de.translate.goog/hochstrom-st.-bu..html?_x_tr_sl=de&_x_tr_tl=en&_x_tr_hl=enhttps://www-elektromodellflug-de.translate.goog/oldpage/hochstromst/hochstromstecker.htm?_x_tr_sl=de&_x_tr_tl=en&_x_tr_hl=enan huge list to search ?https://www.tme.com/html/EN/connector-dc-supply/ramka_20760_EN_pelny.htmla datasheet attached ?some do say 4.5 mm for theses pins

author: daisizhou
author_rank: Super Contributor
timestamp: October 11, 2024, 12:20:19 pm
content: It looks similar to the EC series socket, such as EC5, EC8,.......... and aircraft battery interface type

author: tom66
author_rank: Super Contributor
timestamp: October 11, 2024, 01:25:37 pm
content: Definitely looks like a relative of XT60/XT90 etc., common in RC aircraft and the like. I see XT100 is with two data pins in addition to power, so perhaps something close to that, though I couldn't find an exact match.

author: Pinkus
author_rank: Frequent Contributor
timestamp: October 11, 2024, 02:27:35 pm
content: Thanks for the links.So I am dealing probably with something proprietary. I now ordered some XT90 and will sacrifice them to use just the connectors inside then for a 3D printed housing.

author: darkspr1te
author_rank: Frequent Contributor
timestamp: October 12, 2024, 07:01:31 am
content: here are some similar ones,https://batterysupplies.be/wp-content/uploads/docs/catalog/BatterySuppliesEN2023-Battery-Connectors.pdf

author: Vovk_Z
author_rank: Super Contributor
timestamp: October 13, 2024, 06:38:30 pm
content: It looks like EC5, but with additional signal pin. I haven't een such 3-pin variants.
does anyone happen to have any doc about the Linak dpg1/002-00? - Page 1
Forum section: electronics / projects

author: 0db
author_rank: Frequent Contributor
timestamp: June 11, 2020, 04:47:25 pm
content: The Linak dpg1/002-00 is an interface for desk panel. It features Bluetooth® connection, and two buttons, up/down, allowing the user to set the favourite position.The dpg1 looks similar todpg1k, for which there is a datasheet but I cannot find any documentation about the pin out of the cable and the used protocol.
Does anyone have experience with attiny2313 and 32KHz crystal? - Page 1
Forum section: electronics / projects

author: miceuz
author_rank: Frequent Contributor
timestamp: August 27, 2013, 08:54:26 am
content: Hi all,Yesterday I've failed to make attiny2313 work with 32KHz crystal. We've tried a couple smd crystals and a can crystal, tried changing load capacitance - nothing - it does not start, but 16MHz crystal works ok, so I'm pretty sure hardware is not damaged.The datasheet for 2313 does not tell anything about minimum crystal frequency, just the minimal fuse setting for external crystal is 0.4-0.9 MHz.Does anyone have any experience with this?

author: ve7xen
author_rank: Super Contributor
timestamp: August 27, 2013, 09:29:20 am
content: I don't think the 'tiny2313 has a watch crystal oscillator. The datasheet only mentions 0.4-0.9MHz, and has a footnote that says:Quotefor that range. So I'd say, no, it definitely won't work at 32KHz. You could use it with an external oscillator rather than a crystal though.
Does anyone has experience with COGNEX computer vision systems? - Page 1
Forum section: electronics / projects

author: engineheat
author_rank: Frequent Contributor
timestamp: April 07, 2018, 06:17:51 pm
content: They are usually used in industrial settings. I wonder if they run on proprietary programs or if you are allowed to write your own algorithms in Python or C++?Thanks

author: KerryW
author_rank: Regular Contributor
timestamp: April 08, 2018, 09:41:23 pm
content: I used them back in the 90's. They were already designed in to systems when I arrived, so I only made minor modifications to the software. And it WAS 20 years ago. Much may have changed, and much has been forgotten.As best I remember, we just linked to a supplied library in C++. I was supporting DOS based machines, and they were dropping DOS support about that time. When I asked about information so I could write my own routines, I was told that that information was proprietary.

author: Conrad Hoffman
author_rank: Super Contributor
timestamp: April 08, 2018, 11:39:41 pm
content: We use 'em at work and they're fantastic. I think all our stuff is written in Visual BASIC and C++ and just links to a library. Before we got them, I questioned why we didn't just get a "dumb" camera system. After seeing what they could do, especially how fast they can do it (we use them for motion inspection test systems), I was sold.
Does anyone have access to 1970s issues of Laser Focus World magazine? - Page 1
Forum section: electronics / projects

author: Conrad Hoffman
author_rank: Super Contributor
timestamp: February 10, 2023, 06:03:26 pm
content: I'm writing a company history and would love to get a copy of a specific ad that ran in maybe 1974 or 1975.Even the magazine has no archive of old issues and my library searches have turned up nothing.Thanks,Conrad

author: edpalmer42
author_rank: Super Contributor
timestamp: February 10, 2023, 06:48:35 pm
content: I don't know if this helps you or not:https://archive.org/details/pub_laser-focus-world. It looks like it's just an article index.You should be able to go to your public library and request an inter-library loan for a particular issue. There will likely be a charge for the service.Ed

author: Conrad Hoffman
author_rank: Super Contributor
timestamp: February 10, 2023, 06:58:44 pm
content: The problem is there don't seem to be any libraries to loan from. I'd have thought there'd be microfilm, but so far I haven't found anybody with it. Apparently all technology began in 1989.

author: edpalmer42
author_rank: Super Contributor
timestamp: February 10, 2023, 08:01:12 pm
content: No, it doesn't work like that.You go to your local public library and tell them what you need. They will find the library that has it. It could be at a university library that won't talk to you directly. It could be at a library 1000 miles away. They have the necessary contacts to find and get what you need. It could be a magazine, a copy of an article, or a book on metrology that was published 80 years ago. They'll find it for you if it can be found.Ed

author: edavid
author_rank: Super Contributor
timestamp: February 10, 2023, 08:15:38 pm
content: Looks like it was just called "Laser Focus" in the 70s.Did you see what Google Books has scanned?https://books.google.com/books?q=editions:0AFLRE724UsxDNlHLmQWUau6rSxMthWweUTLWrOFnYiagsBsZUW5x6Ng&id=EkFWAAAAMAAJThe next stop after that would be WorldCat, which I don't understand very well, but look here:https://www.worldcat.org/search?q=n2:00238589
Does anyone have access to IEC standards ?  - Page 1
Forum section: electronics / projects

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: October 02, 2019, 12:02:15 pm
content: Does anyone have access to the IEC62752 standard (EV in-cable chargers) ? I don't need all of it, just want to check a detail. PM or email if you can help, thanks.

author: splin
author_rank: Frequent Contributor
timestamp: October 02, 2019, 05:46:54 pm
content: Check your email.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: October 02, 2019, 07:05:12 pm
content: Sorted thanks everyone

author: artag
author_rank: Super Contributor
timestamp: October 03, 2019, 06:10:54 pm
content: Too late to solve it for Mike, but for other UK residents I've found the BSI library very useful in the past. I used it when it was in Milton Keynes some years ago and it's now near Richmond, but if things are still the same you can just wander in and read most international standards. No copies, though.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: October 03, 2019, 08:15:00 pm
content: Some county libraries offer online access to bsi standards free for library members from home, unfirtunately my area , Essex, dropped it a while ago.There is a list of those that still have it herehttps://www.bsigroup.com/en-GB/about-bsi/uk-national-standards-body/Library-Access-to-Standards/

author: tszaboo
author_rank: Super Contributor
timestamp: October 03, 2019, 08:25:21 pm
content: Quote from: mikeselectricstuff on October 03, 2019, 08:15:00 pmFascinating. Anyone knows anything like this within the (continental) EU?It would be nice to just have access to any of these, without convincing management to spend hundreds of euros for paper.

author: Tomorokoshi
author_rank: Super Contributor
timestamp: October 04, 2019, 12:31:08 am
content: I just ran across this:Quotehttp://europeanlawblog.eu/2017/01/24/a-harmonised-european-technical-standard-provision-of-eu-law-judgment-in-c-61314-james-elliott-construction/https://europeanlawblog.eu/2017/09/25/the-eps-european-standards-resolution-in-the-wake-of-james-elliott-construction-carving-ever-more-holes-in-pandoras-box/
Does anyone have an early QT110 QPROX sensor ? - Page 1
Forum section: electronics / projects

author: chris_leyson
author_rank: Super Contributor
timestamp: December 17, 2017, 12:50:18 pm
content: Just wondered if anyone has an early QT110 capacitive proximity sensor in their old parts stock. The early ones were based on the 12C508 PIC because I just happened to notice that the supply connections for both parts were the same and just had to try it in a PIC programmer. The PIC programmer said it was a 508 and as a bonus it read out the first 40 program words because back then about 20 years ago the 12C508s were quite new and Microchip hadn't done the read protection properly. Well I've lost that little snippet of code and my notes from back then but it was a very clever design and worked really well. The inventor Harald Philipp of Quantum Technology sold the idea to Atmel. I think US6466036 describes the technique used.
Does anyone have any information on this power supply? - Page 1
Forum section: electronics / projects

author: Nick1296
author_rank: Contributor
timestamp: May 11, 2015, 12:46:09 am
content: So I found this in my box of cords trying to sort them out. I'm not exactly sure what this is, so I need some information on it. Thus came with an Acer Aspire One ZG5 I was given. The notebook was gone but I kept the charger.The label says:Notebook AdapterModel: 30W-AR1003? Could also be 30W-ARI003.Input: 100-240V ~ 1.5A 50/60HZOutput: 19V 1.5AHere's a link to it:http://www.aliexpress.com/store/product/30W-19V-1-58A-AC-Adapter-Charger-Power-supply-Cord-for-Gateway-EC1456-EC1456u/902850_467308343.htmlvPicture of the label:

author: xrunner
author_rank: Super Contributor
timestamp: May 11, 2015, 12:51:10 am
content: What do you want to know? It is what it is - it has the voltage and amperage capability listed on the label.

author: xrunner
author_rank: Super Contributor
timestamp: May 11, 2015, 12:56:46 am
content: Quote from: Nick1296 on May 11, 2015, 12:52:52 amSome vendor in China prolly.QuoteIt can be generic, depends on if you need a PS that outputs (if I see the label OK) 19 VDC and 1.55 A. Just measure the output voltage and if it suits a project you can use it sure. I have a lot of those in my PS junk box. Anything can be generic if it suits a need.

author: Nick1296
author_rank: Contributor
timestamp: May 11, 2015, 01:00:44 am
content: Quote from: xrunner on May 11, 2015, 12:56:46 amI mean yeah I'm probably going to keep it but I would never use it on anything I care about. Even then I have a Targus 15-24V Universal now that goes up to 90W. Still nice to have these small fixed bricks though for stuff I'd never use the Targus for

author: sean0118
author_rank: Frequent Contributor
timestamp: May 11, 2015, 01:38:07 am
content: It might do the business, but most of the proper brand name power packs will have an efficiency rating of IV, V etc.As shown in this pdf:http://www.energystar.gov/ia/partners/prod_development/revisions/downloads/International_Efficiency_Marking_Protocol.pdf

author: Awesome14
author_rank: Regular Contributor
timestamp: May 11, 2015, 03:50:32 am
content: Laptop AC adapters are a bit nicer than a typical wall-wart, because they're switching type, which do not vary the output voltage according to the load. Computer components require +-10% of their voltage rating to prevent possible damage. Therefore, laptop adapters are designed to output +-10% of the rated voltage over the entire load range.So, the specs are nothing to write home about, but everyone should have boxes filled with wall-AC to DC rectifiers of every conceivable voltage and current combination, and terminal style, size, etc. You just can't havetoomany of certain things!

author: best man
author_rank: Newbie
timestamp: May 16, 2015, 09:00:26 am
content: just an online shop, what are you wondering?
Does anyone have details about this high quality resistors? - Page 1
Forum section: electronics / projects

author: quarks
author_rank: Frequent Contributor
timestamp: November 10, 2013, 02:45:56 pm
content: I have some of these very old (date code indicates early 70s) but high quality resitors in my collection. Unforunately I do not have a data-/specsheet.My first idea was to ask Vishay (because it looks like a Vishay number), but they had or at least found no details.If anyone has a hint or even a specsheet, that would be great.Thanksquarks

author: SeanB
author_rank: Super Contributor
timestamp: November 10, 2013, 03:10:06 pm
content: Dipped laser etched glass metal film resistors. Very nice units, they just do not like any stress on the leads during forming or use, which can crack the internal substrate or the solder joints. Do use a heat shunt on the legs when soldering, as otherwise they can become rather intermittent, or use the full length of the leads when mounting them.

author: quarks
author_rank: Frequent Contributor
timestamp: November 10, 2013, 04:03:24 pm
content: Hello SeanB,do you know more details, like the TC or where to find a datasheet?Byequarks

author: SeanB
author_rank: Super Contributor
timestamp: November 10, 2013, 04:30:30 pm
content: I just used them, they appeared like magic out of the stores when I ordered spares, all having been bought at the same time in the 1970's. No data other than the ones I was using were made by Thompson CSF and others were Vishay while some were branded SNECMA.

author: quarks
author_rank: Frequent Contributor
timestamp: November 10, 2013, 04:32:35 pm
content: thanksDo you have a guess what TC they might have?

author: SeanB
author_rank: Super Contributor
timestamp: November 10, 2013, 04:37:16 pm
content: I know they were better than 12bit over a -55 to 125c range, as they drifted less than 1 count over that range when I was testing the units they were in were subjected to a rise from ambient of 40C to 120C case temp during testing. I would guess they are better than most 5 digit DMM units can measure, and possibly better than a lot of 6 digit units.

author: quarks
author_rank: Frequent Contributor
timestamp: November 10, 2013, 07:08:16 pm
content: That sounds even better than I thought.Can you guess in which range the TC these resistor were?
Does anyone have HAKKO 937 station (original) ? - Page 1
Forum section: electronics / projects

author: FoxTwo
author_rank: Newbie
timestamp: January 24, 2018, 06:06:49 pm
content: I am trying to fix this broken station but I don't have this transformer for 220V grid.Genuine transformer has 3 different color wiresLink, which I can't test or find info online.Could I ask someone to check voltage on these wires ?
Does anyone have pin out for HP/Agilent attenuators? - Page 1
Forum section: electronics / projects

author: tkamiya
author_rank: Super Contributor
timestamp: January 28, 2022, 01:44:25 am
content: Hello.I have a few attenuator modules from HP (Agilent). Part number is 33321-60057. It has a dual line 10 pin connector as pictured. I can't seem to be able to find a pin out chart for this. Does anyone have one and willing to share?

author: Bud
author_rank: Super Contributor
timestamp: January 28, 2022, 02:40:05 am
content: See if this helps.

author: tkamiya
author_rank: Super Contributor
timestamp: January 28, 2022, 02:57:48 am
content: I didn't know such document even existed. Figure 8 is exactly what I needed. Funny, how HP uses an 14pin connector to drive 10 wire flat ribbon. (both 1 and 2, and 13 and 14) are not used. I have ones with such combinations here as well.Thank you very much!
Does anyone have qty 1 MCP23S08  Microchip SPI expander SOIC18 - Page 1
Forum section: electronics / projects

author: Jester
author_rank: Frequent Contributor
timestamp: May 05, 2021, 08:38:54 pm
content: No stock at Digi-Key or Mouser, I just need one to test my project

author: prasimix
author_rank: Unknown
timestamp: May 05, 2021, 09:56:14 pm
content: I have five

author: Jester
author_rank: Frequent Contributor
timestamp: May 05, 2021, 10:27:25 pm
content: I sent you a PM.Thank you

author: Jester
author_rank: Frequent Contributor
timestamp: May 06, 2021, 12:48:10 pm
content: Well that worked well, 5 on the way from prasimix.