hybridfree/eevblog-posts huggingface dataset:
Looking for PCB mount BNC plug - Page 1
Forum section: electronics / projects

author: jbb
author_rank: Super Contributor
timestamp: April 29, 2024, 08:13:27 pm
content: Hi allI may need to make up some oscilloscope adapters (filter + termination). I want to make a small PCB which mounts straight onto my oscilloscope input.Does anyone have good options for a PCB mount BNCplug?

author: jwet
author_rank: Frequent Contributor
timestamp: April 30, 2024, 09:18:44 pm
content: I ran into this problem a while back. They are somewhat rare but not impossible. I never found a reliable source for production but I was just making lab stuff and found a couple solutions.One place they are used in twisted pair coax balun type transformers used for CCTV systems. These are cheap enough that you can buy them from china and take the bits you need. See photo.I also made a few adapters from BNC T's and L's and a few minutes with a dremel tool. Don't have a great picture but attached what I could.Below is a quick picture of both. Top is label from bag that Balun, left, came in- MC Electronics is a low tech electronic distributor in the US but these can be found elsewhere. Right is a little project that has a 20 Mhz crystal and an NE-602 mixer that was a receive converter to get 162 Mhz Weather on a 2M radio. I've used it for years and its pretty beat up. 9v battery on clips and BNC directly into radio- carved the adapter with dremel wheel to expose center core and outer cylinder. Soldered up pretty well

author: thm_w
author_rank: Super Contributor
timestamp: April 30, 2024, 09:28:18 pm
content: For hobbyist uses, tons are available on aliexpress:https://www.aliexpress.us/item/4001045414672.htmlhttps://www.aliexpress.us/item/1005003918622626.htmlAnother option is to use SMA through hole connectors, which are even more commonplace, and then a BNC adapter.

author: David Hess
author_rank: Super Contributor
timestamp: April 30, 2024, 10:48:51 pm
content: I have a bunch of BNC-male to BNC-male adapters that I use instead.

author: jbb
author_rank: Super Contributor
timestamp: May 01, 2024, 04:06:30 am
content: Thanks allGood idea on the Balun boxes, but I don’t have any lurking around.Will probably proceed with an SMA approach and SMA-BNC adapters for the scope (which are useful to have around anyway).
Looking for Permanent Magnet 3 phase motor driver board - Page 1
Forum section: electronics / projects

author: qno
author_rank: Frequent Contributor
timestamp: March 28, 2014, 05:48:14 pm
content: Hi All,I am looking for a simple 3 phase motor controller chip. Has anyone used one of these?It takes a voltage of 0 to 5 volt or a PM signal to control the motor RPM.I have a controller board (see pics) that controls the rpm of a PM motor.It has a 20 pin chip on it and on de bottom six mosfets to switch the motorwindings.Its the chip in the pictures where the markings are filed of.Does anyone know what chip this is??If someone recognises the PCB please tell me where to order a few?
Looking for Polaroid ID-3000/ID-4000/Digital Palette service software (Gentest) - Page 1
Forum section: electronics / projects

author: philpem
author_rank: Frequent Contributor
timestamp: July 01, 2017, 02:58:03 am
content: Hi there,I'm part way through getting a Polaroid HR-6000 film recorder working again (the previous owner couldn't, and had a good fiddle with the pots and lens alignment...)I'm also trying to build a lens mount for another camera, which is working quite well but needs aligning.To this end, I'm trying to track down a copy of the Polaroid Gentest alignment software for this thing (which also apparently covers the CI-5000, ID-3000 and ID-4000).This would have been distributed on a floppy disk, "DP Gentest" (Polaroid P/N 13437). Going by the service manuals I've found, this is an executable called "DPGENTST" (or possibly "DPALETTE") with a bunch of test images (notably a "tennis court" pattern which is used for focus and alignment).Essentially this tool allows you to display a static image on the CRT (instead of scanning it slowly left-to-right), which is then used to adjust the cameras. It can also be used to calibrate the brightness sensor.Has anyone got a copy of this lying around somewhere, perhaps on an old PC which was part of an ID-3000 or ID-4000 ID card system?Cheers,Philphilpem@gmail.com
Looking for possible MOSFET identification - Page 1
Forum section: electronics / projects

author: OneGeekGuy
author_rank: Regular Contributor
timestamp: July 26, 2024, 05:47:49 pm
content: Hi all,A motherboard blow up due to a possible un expected over voltage in the input, after short looking, I noticed an area which was damaged, looks like they are MOSFETs due to the fact they are close to a possible PMIC and Inductors, the point is that after taking a look to the numbering on other MOSFET close to the damaged one:7534NL1G12Could be an AON7534, but the rest of the PN, either I cannot find it, or it is not critical, do someone knows a bit more regarding how AON Semi name their mosfets? Could I replace it for a AON7534?Any help will be welcome!Thanks!!

author: ZenHombre
author_rank: Newbie
timestamp: July 26, 2024, 07:39:54 pm
content: Found this, their marking guide. you should be good to replace it with AON7534.https://www.aosmd.com/sites/default/files/res/markings/AON7534.pdf

author: OneGeekGuy
author_rank: Regular Contributor
timestamp: July 29, 2024, 03:14:58 pm
content: Thanks! Just what I needed, so I will move forward with that. Thanks again!
Looking for QFN 48 pin 6x6mm layout dimensions - Page 1
Forum section: electronics / projects

author: Yaro
author_rank: Contributor
timestamp: August 13, 2016, 11:44:29 am
content: As title I'm looking forQFN 48 pin 6x6mmlayout dimensions, I've a chip that use this package but datasheet doesn't provide any PCB layout dimensions. I need to draw it but I've found only 48pin QFN 7x7mm layout dimensions. Does someone have correct standard dimensions for this package?Thank you!

author: Kalvin
author_rank: Super Contributor
timestamp: August 13, 2016, 11:52:16 am
content: Have you tried searching from the Google? It is pretty handy.

author: Kalvin
author_rank: Super Contributor
timestamp: August 13, 2016, 11:56:52 am
content: Here is an example:http://lmgtfy.com/?q=QFN+48+pin+6x6mm

author: MagicSmoker
author_rank: Super Contributor
timestamp: August 13, 2016, 12:54:29 pm
content: Quote from: Yaro on August 13, 2016, 11:44:29 amTo search for footprints on Google try variations on the following queries:QFN48 6x6 footprint"QFN-48" 6x6 "land pattern"etc.

author: bobaruni
author_rank: Regular Contributor
timestamp: August 13, 2016, 01:51:02 pm
content: lol, the first search result returned is this thread.

author: tycz
author_rank: Regular Contributor
timestamp: August 14, 2016, 01:54:00 am
content: Yaro,I suggest you download the IPC Land Pattern Calculator.http://www.ipc.org/ContentPage.aspx?pageid=Land-Pattern-CalculatorEnter the package's mechanical measurements from the data sheet and it will calculate a land pattern for you. You can view the attributes of the pattern easily and use this as a reference to recreate it in your PCB software of choice.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: August 14, 2016, 02:09:24 am
content: It would really, really, really help if you told us the part number. Lots of companies put the mechanical and footprint data separately.
Looking for a radial capacitor 2200uF/100V, 15 mm lead spacing - Page 1
Forum section: electronics / projects

author: AndersJ
author_rank: Frequent Contributor
timestamp: March 24, 2021, 07:32:37 pm
content: I need a second source for old Philips blue radial 35 mm diameter electrolytic capacitors with 15 mm lead spacing.2200uF, 100V.Or the originals, 4 pins.Or fewer pins, but 15 mm spacing.Quantity: 250. Or less, anything is better than nothing.Any suggestions?

author: TimNJ
author_rank: Super Contributor
timestamp: March 24, 2021, 08:51:36 pm
content: I probably did the same search you did, the equivalent Vishay/BC is non-stock everywhere it seems.For odd-ball old type electrolytic caps, I've seen some people make a little right-angle daughter board and mount a few smaller (modern) radial caps on it. For instance, you could put 4*560uF leaded caps in a 2*2 grid on the board, then maybe use a right angle Mill-max pin (or something).https://www.digikey.com/en/products/detail/united-chemi-con/EKZN101ELL561MM25S/4843959https://www.digikey.com/en/products/detail/mill-max-manufacturing-corp/3301-2-14-21-00-00-08-0/158220
looking for recommendation for molex type free hanging connector set - Page 1
Forum section: electronics / projects

author: jaunty
author_rank: Regular Contributor
timestamp: January 14, 2020, 10:30:19 pm
content: I'm needing a multi pin connector to interrupt a 20-30 core cable that i want to be able to disconnect.however reliability over the long term is a huge issue with this - so looking for something approaching aerospace quality (approaching is ok not fully there -but much better than your average molex - so gold plated etc would be good) but it has to be fairly compact too since it has to be tucked in with several other wiring looms .. to accept 24-28 ga wire. Any recommendations??

author: jaunty
author_rank: Regular Contributor
timestamp: January 16, 2020, 02:57:04 am
content: no one? wrong category to post in?

author: oPossum
author_rank: Super Contributor
timestamp: January 16, 2020, 03:18:34 am
content: CPC (circular plastic connector) or 'Cannon' connectorshttps://www.te.com/usa-en/products/connectors/intersection/circular-plastic-connectors.html?tab=pgp-storyhttps://www.ittcannon.com/products/listing.aspx?t=connectortype&q=215,219&parttab=#
Looking for recommendations on li-ion power modules - Page 1
Forum section: electronics / projects

author: josechow
author_rank: Contributor
timestamp: February 23, 2018, 03:04:15 am
content: Hey all,I am looking for recommendations for a battery solution with the following specs:- Li-ion- 6s1p configuration preferred (voltage ~22v)- 15-20 W-hour capacity- small/compact design (<1inch tall, <2.5inch wide, <5inch long)- full BMS and charging standalone system- will power LED'sI am having a heck of a time searching amazon / ebay / sparkfun for a module that meets the size requirement. I'd like a pack that is flat as can be seen above.I was starting to dig into cell's and BMS chips and was starting to go down the path of building my own power module using 14500 li-ion cylindrical cells, and a TI bq76930 chip for monitoring; haven't given thought to the charging part yet.any suggestions or leads would be greatly appreciated!~David D.
Looking for RF component kits for 2.4GHz antenna matching - Page 1
Forum section: electronics / projects

author: jrsikken
author_rank: Newbie
timestamp: December 19, 2014, 09:15:34 pm
content: I am new to antenna impedance matching. I have a board with 2.4GHz Wifi antenna and think I need special (high-Q) RF components for antenna matching. Can anyone recommend a cheap 0201 RF (high-Q) component kit containing with inductors capacitors? (and resistors) Please tell me brand, give me links to Digi-Key, ebay or amazon. Thanks

author: ConKbot
author_rank: Super Contributor
timestamp: December 20, 2014, 01:12:16 pm
content: What kind of antenna? pcb antenna? what do you have to work with to tell if you have a good match? swr meter? SA/TG and a return loss bridge? VNA? You can search on digikey for kits, there is a ton of capacitor ones that are meant for RF, and 495-1684-ND looks like a reasonable SMD inductor kit, with the SRF of most the components being higher then 2.5 GHz.

author: KJDS
author_rank: Super Contributor
timestamp: December 20, 2014, 01:17:48 pm
content: There's no need for hi Q parts, ordinary C0G caps are fine.Use coilcraft inductors, you can buy directly from them.

author: jrsikken
author_rank: Newbie
timestamp: December 20, 2014, 09:00:46 pm
content: Thanks KJDS. Nice clear answer.

author: babysitter
author_rank: Frequent Contributor
timestamp: December 20, 2014, 09:02:05 pm
content: Some Manufacturers - Johanson, Wuerth eisos - have design kits which might fit.(Wuerth offers free refill, dont know about others)

author: Howardlong
author_rank: Super Contributor
timestamp: December 21, 2014, 07:33:09 pm
content: It's very rare I go down to 0201, usually I target 0402. A few years ago I purchased a full set of 2% wirewound Abracon parts in 0402 up to about 10nH or so and then up in sizes as necessary when the Q drops off. They weren't in a kit, I just bought strips of 50 of each value and put them in a folder. I am sure you can do the same for 0201, but watch the Q dropping off. You will have to buy wirewound if you want high Q, the multilayer equivalents are low Q although generally a fraction of the price of WW.One comment about Coilcraft, is that while they are good parts, they can give you a BOM shock.
Looking for RF Soc supports WiFi,BLE,433 MHz - Page 1
Forum section: electronics / projects

author: muthukural001
author_rank: Regular Contributor
timestamp: February 16, 2020, 05:02:22 pm
content: Hello All,In my project requirement, WiFi (802.11 a/b/g/n/ac), Bluetooth (BT2.1+EDR/3.0/ 4.1 LE / 4.2 BLE/BLE 5.0) and 433MHz RF transmitter are there.I am looking for an SoC which supports the above. Have anyone crossed a single chip solution for the above? (Or) I have to go with a controller/processor with multiple RF chip?...Please suggest.Thanks and Regards,Muthu

author: janoc
author_rank: Super Contributor
timestamp: February 16, 2020, 09:21:06 pm
content: I don't think you will find something supporting wifi/BLE and 433MHz in one chip. 433MHz is pretty rare in consumer electronics and there would be little gained in having it integrated. You can easily find SoCs that work with wifi/BLE and add a 433MHz radio separately.Just keep in mind that if you want to use all of the above simultaneously, it is going to be fairly complex (interference, antenna sharing, etc.).
Looking for right angle PCB mount mini USB male connector - Page 1
Forum section: electronics / projects

author: eugenenine
author_rank: Frequent Contributor
timestamp: August 18, 2019, 09:08:17 pm
content: Anyone want to help me out, I've searched digi, mouser, etc. I want to make a small adapter to convert some devices of mine with use miniUSB. So I need male connectors to plug into the female on the device, but I want PCB mount and coming off perpendicular to the PCB so I can make the pcb sit flush on the devices. I've found a few pcb mount but nothing coming straight off, most are made to come off the side of the pcb. I've been getting some that can be soldered on to cables and attempting to cut them down but thats not working the best.Thought I'd try and see if anyone has seen what I'm looking for.

author: jc101
author_rank: Frequent Contributor
timestamp: August 21, 2019, 07:21:33 pm
content: Something like this?https://uk.farnell.com/gct-global-connector-technology/usb3150-30-075-a/micro-usb-2-0-type-b-plug-th/dp/2537023

author: eugenenine
author_rank: Frequent Contributor
timestamp: August 22, 2019, 12:42:24 pm
content: yes, but mini, not micro
Looking for RJ45 Prototype Shield - Page 1
Forum section: electronics / projects

author: docmur
author_rank: Regular Contributor
timestamp: June 23, 2014, 09:51:40 pm
content: Hey GuysI'm looking for something like this:http://www.mikroe.com/products/view/169/ethernet-connector-board/specification/Hopefully cheaper then $10, of course if that is the average cost then I'll go and buy them anyway, just can't seem to find anything else this small and compact.I could also make one myself and etch a board but I don't think the return on time and effort would be worth it.ThanksDocmur

author: rob77
author_rank: Super Contributor
timestamp: June 23, 2014, 10:03:26 pm
content: what do you need it for ? you need a lot of other stuff to make an ethernet port.either go for a ethernet module (including coupling transformer, the PHY chip and eventually with MAC as well) or just solder a RJ45 to a piece of protoboard if you have the rest of the circuitry elsewhere.if you're thinking about "bit-banging" ethernet, then you will need a hell-of-a-fast processor or FPGA for that.the best way is to buy a ready-to-go ethernet module - search on dealextreme or e-bay.
Looking for Robomow RM-toolkit - Page 1
Forum section: electronics / projects

author: martonmiklos
author_rank: Contributor
timestamp: June 19, 2019, 10:07:49 pm
content: Hi all,I am looking for a software called Robomow RM-toolkit which is mentioned here:http://www.fedal.it/doc/prova1.pdfI am asking it because I have an Robomow City 120 (looks identical to RL2100) lawnmover, and I would like to reverse engineer the serial protocol used between the operator panel and the mower base. When using the RM-toolkit the operator panel is disconnected and the same connector used via an USB-UART converter.Of course I could reveng the protocol by sniffing the operator panel communication, but I have a bunch of other (for newer RC/RX/RS models) software (Robomow toolkit, Robotools) from the Robomow which is written in C# deployed non-obfuscated. So it is highly likely that having a copy of the RM-toolkit would reduce my reveng efforts pretty much.Thanks in advance and if you need software for the newer models just let me know!

author: smsdalleisback
author_rank: Newbie
timestamp: June 29, 2020, 01:31:14 pm
content: Hi Martondid you ever find it? this toolkit? I need it or something like it for my RM400 and City110 - wanne see if I can swap software in the mowersI could see you mentioning something about robomow's FTP on a hungarian website..Hope to hear back from you.Daniel

author: Franky1665
author_rank: Newbie
timestamp: July 29, 2020, 10:32:10 am
content: Also looking for this RM_Toolkit to see if we can control an RM510 via the service port.

author: bingo600
author_rank: Super Contributor
timestamp: July 31, 2020, 04:35:16 pm
content: Mee too

author: Nivr
author_rank: Newbie
timestamp: September 30, 2022, 02:52:06 pm
content: Quote from: martonmiklos on June 19, 2019, 10:07:49 pmHey Marton,Where can you find these Robomow toolkits?I've repaired a few of these mowers, but this one keeps stopping his blade, and turning in another direction.Maybe it detects some overcurrent in the mowing motor?Kind regards!

author: martonmiklos
author_rank: Contributor
timestamp: September 30, 2022, 06:34:57 pm
content: Hey Nivr,I managed to acquire a copy of the toolkit:https://www.dropbox.com/s/lm06ptikeqoy617/rm%20toolkit%20pack%20v3.6.rar?dl=0Pinout of the RJ11 connector can be found here:https://raw.githubusercontent.com/martonmiklos/robomow_usb_adapter/master/robomow_pinout.pngBefore you connect set the history save interval to 999999999 secs, otherwise it will ran to unhandled exception.QuoteUnfortunately testing wise there is not too much in the toolkit, basically it performs the exact same tests what can be done in the service menu.However the mower motor current can be monitored.Regarding the issue you said, I have no ide how that motor could rotate backwards, as one wire of the motor is connected to the +24V.I made some reverse engineered schematics from the circuit driving the motor which might be helpful:https://github.com/martonmiklos/robomow_rm_510_mainboard_schematic
looking for schematic of BMW - Page 1
Forum section: electronics / projects

author: lordjohn
author_rank: Newbie
timestamp: May 02, 2025, 05:06:22 pm
content: Hi,Doing refurbuishing project on BMW C- Evolution K17 2013 model. I need whole schematic diagram.or anyone help me with (how to debug problems).Problem: Bike doesnt ON. But the battery and motors are good.HOW TO CHECK WIRING IF ITS OKAY OR NOT?

author: Jeff eelcr
author_rank: Frequent Contributor
timestamp: May 04, 2025, 02:04:38 am
content: BMW dealer parts dept or service may help for this info.Jeff

author: themadhippy
author_rank: Super Contributor
timestamp: May 04, 2025, 02:17:37 am
content: do you intend filling the entire forum with asking for the same thing?

author: tinytim
author_rank: Contributor
timestamp: May 04, 2025, 11:20:37 am
content: https://www.manua.ls/bmw/c-evolution-2017/manualloads of PDFs listed on a quick google search.one of the links i found has the schematic.Google advanced search, use filetype:pdf on the end of the search query.
Looking for second source to Omron relay: G5V-1-DC24 - Page 1
Forum section: electronics / projects

author: AndersJ
author_rank: Frequent Contributor
timestamp: July 05, 2022, 07:20:05 am
content: Any second source suggestions for the Omron G5V-1-DC24 relay?Or vendor suggestions, with non zero stock?

author: Weston
author_rank: Regular Contributor
timestamp: July 05, 2022, 07:39:36 am
content: I had to spend a bunch of time recently looking for some replacement Omron relays to replace a blown relay in my dish washer, so I know the pain.Have you looked at the G5V-1-T90 DC24 ? Its listed in the datasheet for the G5V-1-DC24 and I think the only difference is that the G5V-1-T90 DC24 is rated for a higher ambient temperature.The G5V-1-T90 DC24 is listed on Octopart as being in stock at Newark and Allied, which is not great, but is better stock than the G5V-1-DC24.Other than that, the pinouts for these small signal relays are standardized, so you should be able to find acceptable replacements through the digikey parametric search.

author: kripton2035
author_rank: Super Contributor
timestamp: July 05, 2022, 07:54:58 am
content: lcsc has stock. although not a "certified" seller...https://lcsc.com/product-detail/Signal-Relays_Omron-Electronics-G5V-1-DC24_C28694.html
Looking for self contained Galileo / GNSS GPSDO module - Page 1
Forum section: electronics / projects

author: nctnico
author_rank: Super Contributor
timestamp: December 01, 2024, 06:24:05 pm
content: A couple of years ago I created a GPSDO around a uBlox LEA-M8F module. The only extra components needed are a 16 bit DAC and a good quality oscillator. Once you get it configured right, it works quite well. The only downside is that this module doesn't support Galileo. Since Galileo has been up & running for a while now, I would like to add Galileo support to the product in question. So I have contacted uBlox about either firmware support for the LEA-M8F or a replacement product. So far I'm not getting very far with support; all I get is emails bouncing back & forth without the support person remotely trying to find an actual answer to my question.So I start to fear that I'll need to start over which would be something I would like to avoid as verifying / testing the LEA-M8F took quite a bit of time & work. Does anyone have a suggestion for a GNSS module which can be turned into a GPSDO without needing an external microcontroller + control loop software, etc ?
Looking for serial cable pin out for Rackmount UPS by APC - Page 1
Forum section: electronics / projects

author: tkamiya
author_rank: Super Contributor
timestamp: July 06, 2022, 10:25:43 pm
content: I have lots of rackmount UPS by APC. They are all SMT series, SMT3000RM2U and SMT2200RM2U and such. What I am looking for is a SERIAL cable for the UPS itself. It is also different from consumer type UPS. Please note, this is not same as serial cable for network plug in module, either.The connector itself is a 10pin RJ-50 type. Does anyone have a pin out for this?I'd like to update the firmware but this cable is rather expensive. I'd like to make my own.Thanks.

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: July 07, 2022, 01:31:32 am
content: Look here:https://pinoutguide.com/UPS/apc_0625_cable_pinout.shtml

author: tkamiya
author_rank: Super Contributor
timestamp: July 07, 2022, 04:16:09 am
content: That was very helpful. Thank you very much.
Looking for service manual/schematics for the Microohm meter Schuetz MR 300 C - Page 1
Forum section: electronics / projects

author: AndersJ
author_rank: Frequent Contributor
timestamp: January 17, 2019, 12:08:50 pm
content: Does anyone have a schematic diagram or other service literature?

author: AndersJ
author_rank: Frequent Contributor
timestamp: January 19, 2019, 11:30:09 am
content: Perhaps someone has a donor device?Or some other input to help push this repair project forward?

author: Doctorandus_P
author_rank: Super Contributor
timestamp: January 20, 2019, 01:58:05 am
content: Gosh,That looks like a really nice piece of vintage equipment.Not in the same class of instruments, but Mark Driedger wrote an Article in Circuitcelllar #314 (2016-09) of a pretty nice and simple to build milli ohm meter, based on an "arduino", an ADS1115, a few resistors and a little display. That meter has a resolution of 10uOhm.The thing can be built for EUR 20 or so, and it is what modern electronics does, but it still does not have the range of your meter.As you probably know, those meters often consist of a current (voltage) source, and a measurement circuit. When applying an external voltage you can probably determine which of those is faulty. But always start with checking / repairing the internal power supply voltages.What is the failure mode of your meter?If it "does nothing" it probably is in the primary power supply circuit and easy to fix, even without a schematic.

author: AndersJ
author_rank: Frequent Contributor
timestamp: January 20, 2019, 10:03:45 am
content: The instrument lights up and is controllable from the front panel,but it reports overload regardless of measurement range and attached resistance.On the inside there is evidence of overheat/burning on the power supply board and the fuse is blown.I get the feeling that this is the test current generation circuit.By following the PCB traces I can see that this is fed from the rectified secondary of the toroidal mains transformer,and the red and blue cables are attached to the main instrument chassis.It feels difficult attempting to repair this without the schematic.The right hand part of the PCB seems to be the general purpose power supply which is working.

author: AndersJ
author_rank: Frequent Contributor
timestamp: January 22, 2019, 07:00:16 pm
content: The meter is fixed.It was easier than expected.All it took was replacing the visibly damaged components.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: January 23, 2019, 03:45:56 am
content: It looks like those pictures are made after (or halfway through) the repair.The PCB is blackend, but the fuse holder is very clean.If it still looks like that, you should clean the black stuff of the PCB as much as you can.This stuff often is conductive and can easily lead to reliability or stability / accuracy issues.You can use simple water and soap with a brush to clean it.Just let it dry thouroghly before applying power.
Looking for Silicon Labs digital isolators - 200 pcs - Page 1
Forum section: electronics / projects

author: AndersJ
author_rank: Frequent Contributor
timestamp: August 12, 2021, 11:24:42 am
content: I need 200+ isolators:* Si8662BB-B-IS1* Si8662BC-B-IS1* Si8662EC-B-IS1Zero stock, "everywhere".All suggestions appreciated.

author: wraper
author_rank: Unknown
timestamp: August 12, 2021, 11:36:41 am
content: https://www.iodparts.com/part/si8662bc-b-is1r
Looking for slighty nonstandard RGBA or RGBW LED In Round COB Package  - Page 1
Forum section: electronics / projects

author: LaserSteve
author_rank: Super Contributor
timestamp: January 28, 2018, 02:11:29 am
content: I'm looking for an LED that is probably standard in China but as far as I can tell is a bit unusual in the US. My GoogleFu is strong, but I cant find this one. I have a handful of American DJ Mega Tripar DMX Fixtures with a RGBU LED in a round, eight pin, package.While I normally leave them off except for a few special events each year, I have one that has been on for a whole year. As of two weeks ago its color spectrum and brightness was just fine, having been ran on full white. This afternoon I walked by it and its spectrum was decidedly RED. So I pulled it out of the rafters and brought it home for a check-out. I was expecting a blown blue channel or a worn out blue phosphor.I get it on the bench, and open it up, and all the domes or blobs of index matching epoxy on the LEDS have turned a deep brown or red. So wanting to know what to order for repairs, I squeezed a blob off, expecting to ruin the LED, killing the bond wires.. Expecting the fixture to die, as the LEDs are in series, I powered it back up anyways. I was rewarded with a nice balanced white from the LED with the missing dome. I grabbed a pair of parallel jawed pliers, and took off all the other lens blobs. Again much to my surprise, the fixture worked perfectly.The difference between the expensive pro model and the stock, inexpensive Mega Tri-par is the LEDS have a UV die on the cheap ones and a Amber or White die on the Pro Model. The difference in obtainable colors with a white or amber LED added to RGB is amazing, but the difference in the cost between the cheap fixture and the RGBA ones is amazing too..So I can put a nice blob of UV cured optical epoxy on the LEDs and put the fixture back in service. In fact the TIR lenses capture plenty of light from the LEDs as they are now, because there is a flat gel fill over the chips and bond wires, that is not removed. So the idea of converting the fixtures to RGBA , getting rid of the nearly useless UV channel intrigues me. However I can find the round six lead package with RGB, but I cannot find the eight lead RGBA or RGBW OEM package..Pictures are attached, and I suspect there is a Chinese Speaker on the forum that will ID the part..Please have a look, and thanks for any assistance in advance.

author: kjr18
author_rank: Regular Contributor
timestamp: January 28, 2018, 08:16:09 am
content: If you're ok with any leds, just search ebay for "rgbw 4w". This package is very popular in China, quick search in some shops showed many rgbw led's but none in that package. That package type is called Luxeon III Emiter or something similar to that.

author: LaserSteve
author_rank: Super Contributor
timestamp: January 28, 2018, 10:11:44 pm
content: Thank You Sir !Enough LEDS to redo all fixtures I have are inbound.Steve
Looking for small 350...400 V MOSFET. Suggestions? - Page 1
Forum section: electronics / projects

author: Benta
author_rank: Super Contributor
timestamp: June 01, 2022, 12:22:25 am
content: As the title says. TO-92 or smaller.Current is in the mA range, the important part is the drain-source voltage.I've looked at Onsemi, ST, NXP, Nexperia, Infineon... no dice.Any ideas?Thanks.

author: Colt45
author_rank: Contributor
timestamp: June 01, 2022, 12:40:44 am
content: STQ1NC45R for one, I think most of the others make them too.I think most of them will be for micro power offline supplies - geared for switching, not linear use.
Looking for small motor shaft brake - Page 1
Forum section: electronics / projects

author: Kjelt
author_rank: Super Contributor
timestamp: January 14, 2020, 08:11:45 am
content: In some steppermotors and servo's there is a brake built in. It is actually just like a car wheel brake it fits around the axis and clamps the axis when powered or better when unpowered, preventing the axis to move even after the power to the motor has been cut. Very handy and convenient when there is some static load attached that will move the axis.Small motors do not seem to have those brakes, yes you can use a high ratio (1:50 or higher) gearbox , still the sideeffect is the slower response.So I am looking for a small affordable (<$20) brake to fit a 6mm or 8mm axis, preferably for sale in standard production , so not a 2nd hand one off, from ebay.Do they exist ?Does anyone know where to buy them ?Thanks.

author: i_am_fubar
author_rank: Regular Contributor
timestamp: January 14, 2020, 05:38:54 pm
content: Look for shaft electro magnetic clutches. Same mechanism.http://www.chaintail.com/dry-single-clutch-brake-micro.htm

author: Gregg
author_rank: Super Contributor
timestamp: January 15, 2020, 12:36:02 am
content: It depends on the specific motor, of course, but it shouldn't be too hard to put a reduced current DC on opposing coils of a stepper motor to make a magnetic brake.

author: IconicPCB
author_rank: Super Contributor
timestamp: January 15, 2020, 06:06:11 am
content: Depending on the "small" motor look into mobility scooter motor shaft brake.

author: I wanted a rude username
author_rank: Frequent Contributor
timestamp: January 16, 2020, 12:16:07 am
content: How much backlash can you tolerate?If the purpose is safety rather than locking the shaft tightly in position,you could use a pawl similar to how automatic gearboxes park. It's reliable, reasonably strong, and the part tolerances are high.

author: Kjelt
author_rank: Super Contributor
timestamp: January 17, 2020, 02:43:38 pm
content: The purpose is functionality that the axis does not start to move itself under the load after the power to the motor is off.I like the electro magnetic clutches website it also has permanent magnet brakes, those would do the job.Now lets see where I can order them for testing.Thanks people
Looking for small QFP-160 socket - Page 1
Forum section: electronics / projects

author: romhunter
author_rank: Regular Contributor
timestamp: September 23, 2019, 09:00:37 am
content: Hello, I'm currently using a clamshell QFP-160 socket in my design (Part no# QP1-160065-009). The size of the thing is 30.3*30.3 (cm). I'm just asking if someone know a smaller socket? It took a bit of space, and I'm trying to reduce the size of the PCB. Any type of socket, not necessary clamshell.Thanks in advance.

author: TomS_
author_rank: Frequent Contributor
timestamp: September 24, 2019, 06:58:23 am
content: 30cm square?? Did you mean 30mm?I would think that once you get to a basic level of functionality that works reliably you could design a board that doesn't need a test socket.Keep a board with a test socket for development purposes, but look to progress beyond.
Looking for small surface mount switches ... not for PCB though - Page 1
Forum section: electronics / projects

author: calzap
author_rank: Frequent Contributor
timestamp: July 21, 2020, 04:56:39 pm
content: SPST, 24 VAC, 0.5 A. Rocker, slide or toggle. Plastic encased with screw holes for mounting on wood, metal or plastic surface. Small: 25 x 50 mm or less. Wire connections: screws or set screws or quick connects. Any color.Know of any?Mike in California
Looking for SMD pin header with pins thinner than 0,64 mm - Page 1
Forum section: electronics / projects

author: AndersJ
author_rank: Frequent Contributor
timestamp: January 02, 2020, 04:45:05 am
content: I need to make an adapter to replace a non obtanium ram/rtc (DS1386) in a dip socket.I.e. I want to make my own dip component.I’m considering a pcb the size of the chip with smd pins on the bottom,and a smd dip socket on the top where the new chip (M48T18) can be inserted.I need 16 smd single row pins thin enough to fit into a IC socket.Standard pins are 0,64 mm square.These are too thick to comfortably fit a the IC socket on the boards.Where can I find thin smd pins?

author: jhpadjustable
author_rank: Frequent Contributor
timestamp: January 02, 2020, 05:00:49 am
content: Round machine pin headers are excellent for this application, often ~0.45mm diameter. See, for a randomly chosen example, Samtec's BBL series:https://www.mouser.com/ProductDetail/Samtec/BBL-106-T-E

author: AndersJ
author_rank: Frequent Contributor
timestamp: January 04, 2020, 05:07:04 am
content: Excellent suggestions, but not surface mounted.I did however find them atwww.photo-advantage.com/store/.http://www.proto-advantage.com/store/datasheets/MPH100IMP40M-G-V-SM.pdfDigikey has some of their parts.

author: tooki
author_rank: Super Contributor
timestamp: January 04, 2020, 09:34:37 am
content: Quote from: AndersJ on January 02, 2020, 04:45:05 amWhy SMD? SMD headers have the legs going in both directions, requiring you to use alargerboard than if you went through-hole. And for this application, where you’re likely inserting into a regular DIP socket (not a precision one), through-hole’s mechanical strength is desirable if you need to remove it.There are special clip-on pins designed specifically for this type of application, but they’re quite hard to find and expensive. Take a look at the DIL catalog here:https://batten-allen.com/en/what-we-do/catalogue-parts-leadframes

author: AndersJ
author_rank: Frequent Contributor
timestamp: January 04, 2020, 10:14:21 am
content: QuoteI need SMD because I am making a 32 pin DIP to 28 pin DIP adapter.32 pins on the bottom of the adapter pcb connect to a32 pin DIP socket (on the old/legacy board).On the top of the adapter is a 28 pin SMD DIP socket.With through-hole pins,the bottom pins will penetrate the pads of the top side 28 pin DIP socket.With SMD,the top DIP socket can be exactly above the smd pins on the bottom side of the adapter.I could use single row through-hole pins and offset the new chip sidewaysbut surrounding components prohibit that.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: January 04, 2020, 10:26:53 am
content: http://oshchip.org/products/Flip-Pins_Product
Looking for software/console for data monitoring - Page 1
Forum section: electronics / projects

author: zapta
author_rank: Super Contributor
timestamp: May 06, 2015, 04:24:36 pm
content: This is for a friend of mine which is working on complex property system with multiple custom boards and protocols. The system already has a monitoring components which collects data from hundreds of data points and log them for off line analysis and diagnostics.They would like to add a realtime, in the field, monitoring console for diagnostics. It can be software running on a standard notebook computer or tablet or an off the shelf portable and customizable monitoring console, if something like that exists.The project team is very proficient in hardware, software and networking design and can implement any glue functionality required. The goal is to avoid reinventing the wheel and building the monitoring software from scratch.Requirements:* Supporting basic data widgets (boolean, enum, numeric, time series, etc).* Screens can be customizable (e.g. what data points are displayed on each screen).* Ability to control writeable data points is a plus.* This application is not cost sensitive. A mature open source product is nice, but they will prefer an capable and mature product that is expensive over a cheap or free but limited one.Any suggestion? Is LabView a good choice? What about customizable CAN bus monitors, do they exist? Anything else?Thanks.zapta
Looking for some battery protection - Page 1
Forum section: electronics / projects

author: machinehum
author_rank: Contributor
timestamp: July 17, 2023, 06:44:54 pm
content: Hey!I'm designing a 4S3P device that uses 18650 cells with a 9A output. I'm struggling to find suitable protection IC or ICs for this design. I started with the XB8089D in this config.Then I realized the XB8089D has an Rds_on of 20mR, so a power consumption of ~1.65W per IC @9A, which is way above their rating. I chose these ICs because of the 10A overcurrent shutoff, I'm not sure how this is set if the package can't even take that load. I should have run the numbers before, but here we are.Does anyone know of a part that offers the same protection, but drives an external fet? Or something else that might work for this application. Thanks in advance

author: Tjuurko
author_rank: Regular Contributor
timestamp: July 18, 2023, 04:31:47 am
content: HX-3S-FL25A-A. There are 2S/3S/4S/5S.The shunt is collected from two SMD resistors of 5 mΩ to the parallel (total 2.5 mΩ).As the keys, field transistors AOD514 included 4 in parallel were used.Balancing is collected on the basis of the HY2213-BB3A chip, the nominal voltage of balancing 4.20VThe current balancing current is fixed 42 mA (4.20V/100 Ω = 42 mA), this is quite enough for accumulators of not a particularly high capacity.Balancing works constantly and regardless of protection scheme. While the voltage on any of the batteries exceeds 4.20V, a load resistance of 100 Ω is connected to it until it is discharged to 4.20V.On P-N-P Transistors Q1-Q6, a level converter and signal accumulator with HY2210-CB are assembled.On n-p-n transistors Q7-Q9 collected logic of power keys.Q7 is unlocking when any battery reloads to a voltage below 2.40V, recovery occurs at a voltage over 3.0V (after the load is removed or connected to charging).Q8 provides protection of protection after its operation until the load is completely removed. At the same time, it organized a high -speed protection with a short circuit circuit when the current rises over 100A.Q9 is unlocking when any battery is reloaded to a voltage over 4.28V, recovery occurs under load at a voltage below 4.08V. At the same time, power keys do not interfere with the course of the discharge current.S1 and S2 - control points, they have nothing to do with thermal protection. Moreover, it is impossible to close them among themselves.A signal appears on the S1 when reloading any element.A signal appears on the S2 when reloading any element, as well as after the current protection is triggered.Consumption current, not more than 8 μA.

author: machinehum
author_rank: Contributor
timestamp: July 18, 2023, 04:45:11 pm
content: Quote from: Tjuurko on July 18, 2023, 04:31:47 amThanks for the reply, but I can't find stock of the HY2210 to save my life. Would you happen to know where I can get this part? or an alternate part number?Edit: There looks to be some HY2112-* out there, but the overcharge looks to trigger at 3.7V, which isn't ideal for lipo.
Looking for some good books about computer peripheral interfaces - Page 1
Forum section: electronics / projects

author: brue
author_rank: Contributor
timestamp: March 06, 2013, 09:39:39 pm
content: Hi,i'm looking for some goot books about computer peripheral interfaces, such as-ATA, IDE-SD-Cards-MMC-Cards-SATA-USBWith information about electrical and protocol things..Any tipps?Thanks
Looking for some help assembling PCBs - Page 1
Forum section: electronics / projects

author: siliconsparrow
author_rank: Newbie
timestamp: February 04, 2015, 12:07:48 am
content: Apologies if this is the wrong place to ask,I'm looking for someone to assemble a dozen or so prototype PCBs for me. Mostly SMD parts like 0603 and that sort of thing.It's a paid job just right for a student or hobbyist looking for a little extra cash.I'm in Sydney, northern beaches area. Someone close by would be preferable.

author: tautech
author_rank: Super Contributor
timestamp: February 04, 2015, 12:18:02 am
content: Welcome to the forum.Hand soldering?Reflow?Just passives?A bit more info might assist with finding the "right" help.

author: siliconsparrow
author_rank: Newbie
timestamp: February 04, 2015, 01:31:03 am
content: Hand soldering. Mostly surface mount including 0603, 1206, TSSOP, SOT-23 SOIC and similar packages. I have one fairly easy BGA but I can do that myself if you do not want to touch it (for which I would not blame you, I hate BGAs). There are also a small number of through-hole parts. You could use reflow if you like but I don't have a stencil so you'd have to apply the paste by hand. Most boards have parts on both sides.This is prototyping, not production so there are many different board designs and I'll be needing only one or two of each board.I've attached a photo of one of the more complex boards, hand soldered by me with a couple of patches because it's a prototype. I have a few more prototypes like this to build but am snowed under with work at the moment and would love some help with them. I will pay for your time.

author: moffy
author_rank: Super Contributor
timestamp: February 05, 2015, 12:40:42 am
content: In Sydney but can't help with the soldering, too small for me. Best of luck, it's difficult when you're a one man band, work is either a famine or feast.

author: miguelvp
author_rank: Super Contributor
timestamp: February 05, 2015, 05:29:47 am
content: Dave used a local place to populate his boards, not sure on the cost.I think there are some old videos of the place in his channel.
Looking for some ideas for high power LED driver (up to 150W constant current) - Page 1
Forum section: electronics / projects

author: Miyuki
author_rank: Frequent Contributor
timestamp: August 16, 2016, 08:21:00 am
content: Hi,I need to drive serial connected led modules with full current 1700mA and total power will be up to 150W, input will be 230V ACIt should have dimming input signal like 0-5V or similarIt don't have to be isolated so simple buck converter can be usedHave anyone experience with similar driver ? (Or if can I buy it ready for use cheap then where)What control IC and other components should I use ?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: August 16, 2016, 08:41:39 am
content: Dimming can be added in a semi-obvious manner. I make no guarantees about other specs, as-is.Tim

author: Ice-Tea
author_rank: Super Contributor
timestamp: August 16, 2016, 09:38:36 am
content: DIY with a few more bells and whistles:have a look at Power Integrations stuff. They top out at 75W, though, so you may need 2.Off the shelf, cheap and somewhat decent: Meanwell, something likehttp://www.meanwell.com/webapp/product/search.aspx?prod=ELG-150

author: Miyuki
author_rank: Frequent Contributor
timestamp: August 16, 2016, 11:20:25 am
content: That Mean Well look nice, just 200W variant constant current is not so cheap it cost almost double than 150W and that don't have enough voltage in constant current modeI was originally thinking about something simple like AL9910 based driver
Looking for some suggestions for optocoupler jellybeans - Page 1
Forum section: electronics / projects

author: mrflibble
author_rank: Super Contributor
timestamp: August 06, 2013, 09:54:23 am
content: Subject says it all really. My typical usage is low-medium speed, but any suggestions welcome.

author: David_AVD
author_rank: Super Contributor
timestamp: August 06, 2013, 11:13:01 am
content: I was looking at PC817 (EL817) on eBay only yesterday. They were only about $0.20 each I think from some sellers?

author: mrflibble
author_rank: Super Contributor
timestamp: August 06, 2013, 11:55:32 am
content: Heh, I am down to my last 4 DIP flavored PC817's from Sharp. Thanks for the ebay reminder, I just noticed $3.80 for 50. *clickey* Okay, so that takes care of that near-empty drawer. Any other part suggestions? Always good to have some alternatives IMO.

author: wraper
author_rank: Unknown
timestamp: August 06, 2013, 12:46:31 pm
content: 4N35 for SMPS. For higher speed tasks I can recommend H11L1 1 Mbd, not from ebay, crazy prices, 6N137 10 Mbd. For triac driving - MOC3051/3052 (without zero crossing), MOC3063 (with zero crossing). There are lower voltage versions of MOC but they seem to degrade in voltage too often. Start to open randomly after some time.
Looking for somebody to design PCB SFF-8654 8i 74Pin to SFF-8654 8i 74 adapter - Page 1
Forum section: electronics / projects

author: smile
author_rank: Regular Contributor
timestamp: March 31, 2025, 09:33:36 am
content: Looking for somebody to design PCB SFF-8654 8i 74Pin to SFF-8654 8i 74Pin adapter bracket.This is needed for eGPU wire routing from inside to outside of any workstation / Server.Something like this but for SFF-8654 8i to SFF-8654 8i 74Pin