hybridfree/eevblog-posts huggingface dataset:
Need suggestion - SMD connector that can be used for ~1A low V DC power input  - Page 1
Forum section: electronics / projects

author: wb0gaz
author_rank: Frequent Contributor
timestamp: August 26, 2023, 01:57:33 am
content: I need to migrate a PCB design that presently uses a garden-variety 5.5/2.1mm coaxial DC power connector for low voltage/current supply input (12V 1A class application) to a connector that is surface mount, as I cannot permit any protrusion from the bottom of the PC board. (edit) Connector is carrying DC so needs to have polarized property (/edit). After some searching, I've not found any obvious choice with a coaxial type arrangement like the 5.5/2.1mm style. I have considered USB-C, however, the supply is derived from a rechargeable battery (rather than a USB-C power adapter) and the application would have no way to trigger reconfiguration of a USB-C power supply in any event. This is not for a commercial/professional application, so there are no regulatory requirements. Compatibility with 5.5/2.1mm coaxial plug would be ideal, but can migrate the power plug as needed. I'm only looking for a connector (pair) suggestion, not the power source or other application specific solution.Thanks for any suggestions/recommendations or requests for any clarification of the requirement.Dave

author: ataradov
author_rank: Super Contributor
timestamp: August 26, 2023, 02:17:46 am
content: There are SMD versions of the barrel plug connectors. If the size fits otherwise, it is probably the best option.

author: wb0gaz
author_rank: Frequent Contributor
timestamp: August 26, 2023, 11:52:38 am
content: Thank you, good suggestion, I have now located some options in that family (CUI PJ035 etc.)
need suggestions for DC-DC switching regulator for audio circuit - Page 1
Forum section: electronics / projects

author: StratMan
author_rank: Newbie
timestamp: March 30, 2015, 06:19:15 am
content: Hey all,I am in need of a switching DC-DC voltage regulator/inverter suitable for audio application (low noise).Voltage source would be a standard single cell lithium-poly (3.7V), looking for a dual output voltage around +5V and - 5V (~10mA each rail)Any recommendations would be greatly appreciated, thanks in advance!cheers , roger

author: PeterFW
author_rank: Frequent Contributor
timestamp: March 30, 2015, 03:58:57 pm
content: Quote from: StratMan on March 30, 2015, 06:19:15 amTry searching for a "regulated boost charge pump" and "regulated inverting charge pump" over at linear tech, maxim and texas instruments.They have a few nice chips.
Need supplier of PTC Thermistor to repair Panasonic Microwave Combination Oven.  - Page 1
Forum section: electronics / projects

author: Glengardener
author_rank: Newbie
timestamp: June 25, 2022, 04:23:16 pm
content: I am trying to repair a Panasonic Combination Microwave Oven. The microwave section is working fine and we still use it regularly.The Oven section has stopped working due to the failure of the Oven temperature sensor which is an encapsulated thermistor capable of withstanding oven temperatures (up to 220 deg F).This item should cost pennies but we have been trying to source it for nearly a year.Panasonic cannot supply it and will not allow customers to contact their service engineers.The Partmaster: Stock No is 1582602PM but Partmaster no longer stock it and I have searched the internet to try and replace it.We have managed, with difficulty and the assistance of an on-line contact to obtain a Service Manual for the device and this identifies the component. It gives some rough guidance to the temperature/resistance values.The device has failed/open circuit (resulting in being unable to take any measurements) The Service manual, page 30, point 9, provides the following measurement details ... sensor should measure in the range of 360k to 800k ohms (between 50F and 90F) ... there is no indication of any other readings/specs, including whether this is an N or P coefficient sensor, however, the test details highly suggest the resistance goes UP with temperatureBased on these minimal details, expecting the following specs; Thermistor: 620k ohms at 77F (25 deg C) with a positive coefficient and slope of 7k to 8k ohms per degree FThe Model is a Panasonic Combination Microwave Oven NE-972The Serial number is QB 03459The PTC Thermistor part Panasonic Part number is ANE605Y2LOAPThis item is mounted on a plate with a two screw fitting which we still have. One leg of this mounting is marked 67457 and It is connected to the microwave via a two wire lead and a small pcb with a variable trimming resistor to give the exact temperature for oven control. We still have this part as well. All we need is the Thermistor. We have attached photos of the item with its' mounting and the attached pcb.I have absolutely no wish to dispose of a complete piece of equipment just because I am unable to source one 10mm. long component which should cost only pennies.If any "repairers" can give advice or know of any suitable item which we can purchase PLEASE do let me know.

author: Conrad Hoffman
author_rank: Super Contributor
timestamp: June 25, 2022, 04:46:10 pm
content: Not a clue and it looks like a really custom device. I'd probably start by getting a resistance box that covers the range and doing some mapping to be sure of what's needed. With that info I'd look at available sensors.

author: andy3055
author_rank: Super Contributor
timestamp: June 25, 2022, 10:47:50 pm
content: If you can find a parts unit ...
Need thin, very low power, light strips - Page 1
Forum section: electronics / projects

author: cncjerry
author_rank: Unknown
timestamp: June 28, 2025, 10:05:12 pm
content: Hello all,Certain Sony music players use a flat light strip, about 1.5cm x 6cm, give or take. They are roughly the size of a backlight strip you would find in a 14pin, 2x10 display. When I measured the current at 5V for the backlight in a 14pin display, they drew about 600ma, much higher than I would expect. Comparatively, the strip in the Sony player draws 17ma-20ma. Anyone know what the technology difference would be to enable me to search for the lower power strip? I have two units I'd like to repair.ThanksJerry

author: 5U4GB
author_rank: Super Contributor
timestamp: June 29, 2025, 07:20:19 am
content: Just a general thought, what about undervolting/underpowering a higher-power strip? My bench lighting is a way-underpowered 24V strip that has 90% of the brightness at a fraction of the power.

author: cncjerry
author_rank: Unknown
timestamp: June 29, 2025, 07:58:51 am
content: Thought about that, but 600ma vs 17ma is a very large, like 97% delta.

author: inse
author_rank: Super Contributor
timestamp: June 29, 2025, 02:02:17 pm
content: Did you check whether series resistors for the backlight were required or fitted?600mA seems way off my expectations

author: cncjerry
author_rank: Unknown
timestamp: June 29, 2025, 09:32:55 pm
content: I measured the voltage going to the light strip in the unit, 5.7V, granted it could be open and I didn't load it down to see if it was current limited. I have a working unit and it draws 17ma extra when the light is on. The backlight strip I took out of a display is barely lit at 17ma. I could do more research and comparisons but I think there is different technology at work in one light vs the other.
Need this article on current source as I cant locate the pdf  - Page 1
Forum section: electronics / projects

author: Overspeed
author_rank: Frequent Contributor
timestamp: November 25, 2024, 08:17:38 pm
content: HelloI search this article on a low noise low cost current source from 1993Does some one have a copy in PDF ?RegardsOS

author: Echo88
author_rank: Frequent Contributor
timestamp: November 26, 2024, 12:18:57 am
content: https://www.wellesu.com/10.1063/1.1143939
Need tips on a great precision DAC (no calibration needs) - Page 1
Forum section: electronics / projects

author: dav888
author_rank: Regular Contributor
timestamp: September 12, 2020, 09:09:15 pm
content: Requirements:• -10.00 .. 0.00V .. 10.00V range• no need for calibration of INL or offsets• stability over 15-60°C temp rangeResponse-time not that important, but wouldn't hurt if it can operate as a signal-generator up to 50kHz

author: tszaboo
author_rank: Super Contributor
timestamp: September 12, 2020, 11:07:45 pm
content: AD5781 ?It is not even that expensive for what it does.

author: David Hess
author_rank: Super Contributor
timestamp: September 13, 2020, 01:12:44 am
content: I would start with the 20 bit 1 INL AD5791 which I found by using the selection guide here:https://www.analog.com/en/parametricsearch/10933#/p165=1&p7=18|20&sort=4737,asc

author: Micke
author_rank: Regular Contributor
timestamp: September 13, 2020, 07:26:01 am
content: I agree with David! The AD5791 is really nice! Preferraby the more expensive "B"-version with better INL specification. Pricey yes, but considering the specs I would say after all it is OK!A little nervous solder it though!But my old trusty Metcal with fine tip and fine Pb solder fixed it!I did a project a while ago with AD5791, might be of some inspiration!https://www.eevblog.com/forum/metrology/diy-acvdcv-calibrator-with-ad5791/msg3087976/#msg3087976

author: tszaboo
author_rank: Super Contributor
timestamp: September 13, 2020, 12:17:47 pm
content: Quote from: blueskull on September 13, 2020, 08:13:24 amBack in the real world, people have deadlines.

author: Twoflower
author_rank: Frequent Contributor
timestamp: September 13, 2020, 04:02:49 pm
content: Nice suggestions. But I miss some of the requirements. What should be the resolution for the DAC for example? Maybe a 3 level output (-10V, 0 and +10V) is enough for the poster.Sorry I couldn't resist to post that. I had a nice clown for breakfast earlier today.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: September 13, 2020, 04:33:12 pm
content: -10.00 to +10.00, that's 2000 counts and a 12 bit DAC will be fine. Lot's of choice in those.Instead of recommending some random part number, start by thinking about, and then post what your requirements are.
Need to drive eDP (DisplayPort) panel for cheap - Page 1
Forum section: electronics / projects

author: c64
author_rank: Frequent Contributor
timestamp: July 15, 2021, 05:25:39 am
content: I need to drive laptop LCD screen with eDP interface. Also project will need to have fpga ~3K LE. I see two options:1. Use fpga which can implement eDP transmitter.2. Use fpga and some "eDP transmitter" chip, but I had no luck to find one.Any recommendations? Price is important. Prefer no BGA.If it was LVDS I would just use any cheap fpga + lvds transmitter like SN75LVDS83B. But all laptop screens now have eDP interface only.

author: Berni
author_rank: Super Contributor
timestamp: July 15, 2021, 06:10:34 am
content: Well DisplayPort is LVDS, just with extra layers on top.But yes the problem is that the bitrates on DisplayPort are rather high even for the slowest modes. So a lot of FPGAs won't be able to generate it with generic built in LVDS. You won't typically get hardware support for DP, so it's mostly about using Serdes blocks for generating the signal.If this is for some small one-off project then just get a external chip to do it. Its going to be less hassle and manhours to get it working as well as most likely cheaper. For HDMI it's a similar story.

author: c64
author_rank: Frequent Contributor
timestamp: July 15, 2021, 06:57:21 am
content: It's not one off but not huge either. Yes I would prefer external chip, do you know any?

author: Miyuki
author_rank: Frequent Contributor
timestamp: July 17, 2021, 07:05:05 pm
content: Just take any HDMI to EDP chip?Like NCS8803
Need to find a simple RF transmitter IC that can accept external clock - Page 1
Forum section: electronics / projects

author: JPortici
author_rank: Super Contributor
timestamp: October 28, 2022, 08:38:06 am
content: So, i'm thinking about replacing an existing solution to a cheaper one.Board was first designed to have an RF transceiver, but over time we abandoned all the reception functionality, the circuit only transmits.We have to redesign the board (obviousy) and i was thinking about replacing the RF block with a simple, cheaper one.I've found some options but they have two main problems:1) The dumber ones such as WL4456 and all with the equivalent pinouts (seehttps://datasheet.lcsc.com/lcsc/2111101730_WL-WL4456_C2917281.pdf) require a crystal to operate. However, in order to save precious space (more than for cost reason) the microcontroller is supposed to generate the clock that drives the radio PLL. Does anybody know the internal architecture of these things, and if they can operate with an external clock?2) The smarter ones that only need one pin for the crystal, and that have internal capacitors, are of course programmable. However they tend to accept external clock signals (though they require a certain amplitude and the datasheet never goes into details about it) I have identified two possible candidates: MICRF1114 from microchip (seehttps://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/50002416A.pdf) and CMT2110A from CMOSTEK/HOPERF (seehttps://www.hoperf.com/data/upload/portal/20190307/CMT2110AW%20Datasheet.pdf)As i said, the problem i have with (1) is that i don't know if they can be ran with an external clock, and i'm pretty sure i'm not going to get support on them. However, they are dumb.. give them a clock and flip the data bit. great.The problem with (2) is that they are programmable hence may require programming. The microchip one has the API exposed, but microchip has EOL'd too many RF parts this year for me not to be uneasy about designing in that part. The one from HopeRF require you to generate a binary blob from their application, and program them from their tools. They won't provide me an API for programming (but i have found some bits of code in github) and documentation to generate the contents of the registers myself so it is in all effect a black box i want to stay clear fromBasically, looking for an answer on (1), or the (3) alternative to (2)
Need to find alternative to Myrra 47133 - SMPS module 9V out - Page 1
Forum section: electronics / projects

author: 8086
author_rank: Super Contributor
timestamp: November 05, 2011, 12:54:59 pm
content: HiI found this useful little module at Farnell:http://uk.farnell.com/jsp/search/productdetail.jsp?sku=1825786It's a SMPS module that takes 80-250vac input and gives 9vdc output. It's about 3x2cm footprint.But there's several other parts I can't find there so I want to buy everything from mouser. Unfortunately mouser doesn't have that part or any in the series.So I just wanted to know if anyone knew of a similar module by a different company?Cheers

author: david77
author_rank: Frequent Contributor
timestamp: November 05, 2011, 02:34:13 pm
content: MeanWell make similar modules, not shure if they have something that small, though.

author: veryevil
author_rank: Unknown
timestamp: November 08, 2011, 11:09:31 pm
content: Ive used these before very simple to use and pretty good size.http://uk.farnell.com/tracopower/tmlm-04109/psu-pcb-mount-4w-9v-0-44a/dp/1772161These are also quite good if your after small and low power the strange choice of output voltage is a bit oddhttp://www.rapidonline.com/Electrical-Power/0-5W-and-1W-Ultra-compact-PCB-mounting-power-supplies-119270

author: 8086
author_rank: Super Contributor
timestamp: November 13, 2011, 10:32:02 pm
content: Thanks, they would be fine but they're twice the price of the other one so I guess i'll just order them from Farnell separately.Cheers guys.
Need To Find Male Mating Connector For Amphenol Female - Page 1
Forum section: electronics / projects

author: bostonman
author_rank: Super Contributor
timestamp: September 17, 2024, 01:26:12 pm
content: Last night and this morning I searched for connectors. The project is for my recently repaired frequency counter. I plan to bring the signals to the back panel so I can connect an external display should the front panel VFD fail in the future. I plan to use a female receptacle on the rear where three unused BNC holes already exist. The external display will have a cable with a male end to connect.The total signal lines are five pins, so I need a five-pin connector (more if they come in the same size for any possible future needs), about 0.515" (the size of a BNC hole - but I plan to file the hole larger a bit to accommodate the slightly larger ones I'm finding), locking (Bayonet or threaded), and solder cups.The one I found that looks great is: ABD-05PMFS-LC7001Now I'm looking for the male version so I can build a cable, however, Digikey doesn't list any mating versions and the Amphenol website lists the mating types, but Digikey (and/or Mouser) have an eight-week lead time.I want to avoid buying a non Amphenol and risk them not mating. Does anyone know a better connector that lists the mating pairs?

author: coromonadalix
author_rank: Super Contributor
timestamp: September 17, 2024, 02:47:28 pm
content: you should find it like this : amphenol ltw serieshttps://www.digikey.ca/en/products/filter/circular-connectors/circular-connectors/amphenol-ltw/436?s=N4IgjCBcoLQdIDGUBmBDANgZwKYBoQA3AOygBcAnAV3xAHsoBtcAdgFYAWEAXQIAcyUEAGVKAS2IBzEAF85QAi think this one should fit ??BD-05BFFA-LL7001loll silly me its an female cable connectorbut you get the idea, you have many pages as a search resultBD-05BMMA-LL7001 is not far away, but you need the twist lock housing

author: bostonman
author_rank: Super Contributor
timestamp: September 17, 2024, 11:04:28 pm
content: Thanks, but seems that's just the link for circular connectors which I was on. It doesn't seem to point me towards the mating male version except on the Amphenol website.As for the part number you provided, much like the part numbers on Amphernol, Digikey nor Mouser have them in stock.

author: notsob
author_rank: Frequent Contributor
timestamp: September 17, 2024, 11:22:06 pm
content: try searching for aviation circular connectors GX Series
Need to find SPDT SWITCH - Page 1
Forum section: electronics / projects

author: dhumx
author_rank: Newbie
timestamp: March 25, 2019, 05:37:40 pm
content: Hi all, I'm trying to build a project has 2 local osc that generate frequencies on VHF. The 2 local osc must be connected to a SPDT switch, the spdt switch that I would like to have is the one that can be drived by the clock of arduino. Is there any SPDT switch that do the job? I have no idea what switch to use since all the SPDT switch I have worked before are all mechanical.

author: wnorcott
author_rank: Regular Contributor
timestamp: March 25, 2019, 06:12:05 pm
content: Have you looked at the CD4053 or its lower voltage variant, the 74HC4053 ? That is three, SPDT electronic switches on a chip each driven by a logic level signal.The -3dB frequency is 150-160 MHz so although that is VHF does not cover the entire frequency range of VHF.

author: Teledog
author_rank: Regular Contributor
timestamp: March 25, 2019, 06:17:55 pm
content: Skyworks, among others, make them..kHz to gHz.Search Digi-key or eBay for Skyworks spdt

author: Benta
author_rank: Super Contributor
timestamp: March 25, 2019, 07:14:17 pm
content: The 4053 will have major crosstalk/feedthrough problems.Check Vishay/Siliconix for good analog switches.

author: dzseki
author_rank: Frequent Contributor
timestamp: March 25, 2019, 08:51:42 pm
content: SN74LVC1G3157?

author: dhumx
author_rank: Newbie
timestamp: March 26, 2019, 02:21:18 am
content: My adviser on the project calls it a soft switch, but we do both agree that it is a SPDT switch but idk why he calls them soft switch but when I tried searching for it, all I get is software switch which is not what I wanted

author: rcbuck
author_rank: Frequent Contributor
timestamp: March 26, 2019, 03:24:54 am
content: I've used the TS5A3159A in the past with good results. It is in a very small SMD package but can be soldered by hand with care. However, it is limited to 100 MHz. Mouser stock them and they are only $0.85 in single lot quantity.

author: pwlps
author_rank: Frequent Contributor
timestamp: March 26, 2019, 09:33:12 am
content: For VHF/UHF I have used the LMH6570, it is a bit more expensive but is much faster than 74HC4053 or TS5A3159A and has a wider PS voltage range.
Need to identify part - Page 1
Forum section: electronics / projects

author: jtronix
author_rank: Regular Contributor
timestamp: May 18, 2016, 04:59:42 pm
content: Hii,Please see image ..this look like black rubber which was mounted on mental body downside it was placed on smps output capacitor pin (solder side).black part was placed between smps output capacitor and metal body and metal body was finally connect with chassis ground.can anyone identify which material is this and why this is placed like this??

author: SeanB
author_rank: Super Contributor
timestamp: May 18, 2016, 07:42:01 pm
content: Most likely a vibration damper and spacer, so that the board flexing due to either applied force or vibration does not short the capacitor pins, and thus the power supply, to the chassis ground. Likely it is a neoprene rubber synthetic foam, typically with an adhesive layer on one or both sides. Very common as sound samping material on panels, and in cars inside the doors and body for vibration damping.

author: jtronix
author_rank: Regular Contributor
timestamp: May 19, 2016, 03:06:47 pm
content: see more picture to clear scenario.in this case capacitor shorting is not possible at all because distance from chassis and board is quite enough..does this is used for emi/emc noise suppression

author: SeanB
author_rank: Super Contributor
timestamp: May 19, 2016, 03:50:36 pm
content: For acoustic noise reduction yes, and to keep the case from flexing to touch the board. Not for EMC as it would have to be a conductive foam to do that. They must have had an earlier version shorting out from either vibration of heat flexing the board or case at that point, so this was added to ensure it was not going to short out. As there is a conformal coat there it would not be any conductive foam.

author: jtronix
author_rank: Regular Contributor
timestamp: May 19, 2016, 03:56:25 pm
content: do you have any datasheet??how acoustic noise is relate to smps circuit??this is smps boost converter which convert 24VDC to 90 VDC.

author: jtronix
author_rank: Regular Contributor
timestamp: May 20, 2016, 04:31:33 am
content: awaiting for experts comment
Need to identify this smps boost IC - Page 1
Forum section: electronics / projects

author: plazma
author_rank: Frequent Contributor
timestamp: August 12, 2015, 12:43:05 pm
content: Does anyone recognize this IC:I have this led boost circuit:https://test.pcb-components.de/led-aufwaertswandler-boost-step-up/led-senser-xtreme-200-2050ma-6v-30v-detail.htmlI need to digitally change the parallel current set resistors. I need to know what the boost IC is so I can figure out the schematic.

author: MagicSmoker
author_rank: Super Contributor
timestamp: August 12, 2015, 01:39:49 pm
content: LT3755 by Linear Technology
Need to know about Generic Arm Processor Die manufacturers - Page 1
Forum section: electronics / projects

author: Arsh ahmad
author_rank: Regular Contributor
timestamp: November 04, 2024, 05:15:44 am
content: Hi all,I want to create my own System in Package device, with Arm processor as few sensors, need to know contact of any Chinese or any other OEM that support providing Arm processor DIEs at lower quantities. Since Initially I only want to make 10 of them.

author: ataradov
author_rank: Super Contributor
timestamp: November 04, 2024, 06:20:41 am
content: I doubt anyone will bother unless you have a big company standing behind you and could commit to bigger batches.Normally they all will want at least a full wafer order, which would cost $5k-10k, which is not that much compared to the cost of packaging equipment.

author: Arsh ahmad
author_rank: Regular Contributor
timestamp: November 04, 2024, 07:27:19 am
content: You have any contacts if they can support a full wafer

author: ArdWar
author_rank: Frequent Contributor
timestamp: November 04, 2024, 07:40:02 am
content: Have you consider using WCSLP package instead of direct die?Anyway some manufacturers do offer diesale. Just contact them directly, who knows.

author: brucehoult
author_rank: Super Contributor
timestamp: November 04, 2024, 07:40:02 am
content: I don't know in the Arm world, but if RISC-V is ok then the CTO of WCH is quite responsive to queries on twitter or email. He's told me they can even customise their chips for minimum 1 wafer orders (plus NRE costs, obviously).https://x.com/patrick_riscv

author: krish2487
author_rank: Frequent Contributor
timestamp: November 04, 2024, 09:53:49 am
content: https://tinytapeout.comI m not sure if this meets your requirements entirely.. worth a shot though...
Need to make an RFID reader, but the EM4095 is no longer available - Page 1
Forum section: electronics / projects

author: cdwijs
author_rank: Regular Contributor
timestamp: March 04, 2019, 11:47:03 am
content: Hi All,I would like to find (or build) an open source system that can read and decode RFID chips that conform to ISO 11784-11785 FDX-B.I've looked at an EM4095 based system that uses an ESP8266 or ESP32 for decoding the received signal:https://github.com/Crypter/EM4095(ESP8266)https://github.com/asetyde/EM4095(ESP32)The problem is that I'm unable to source the EM4095 from the vendors I usually get my parts from (Farnell, mouser, digikey, rs-components). Does anybody know an alternative IC that functions more or less the same as the EM4095?I've also found the following schematics made from discrete parts:http://playground.arduino.cc/Main/DIYRFIDReaderhttp://www.gizmolab.co.za/universal-rfid-reader/Cheers,Cedric

author: digsys
author_rank: Unknown
timestamp: March 04, 2019, 12:22:15 pm
content: What about this guy -RI-STU-MRD2www.ti.com/tool/MRD2EVMhttps://au.element14.com/texas-instruments/ri-stu-mrd2/rfid-micro-reader-134-2khz/dp/2334573I've used heaps of them ...
Need to record the message exchange between two GPIB devices - how? - Page 1
Forum section: electronics / projects

author: wb0gaz
author_rank: Frequent Contributor
timestamp: September 19, 2025, 10:00:00 pm
content: I've got a need to capture the messages exchanged between two GPIB devices - one is a bus master/controller, the other is the controlled device. As the controller is itself an embedded device rather than a general purpose computer with GPIB port, and the "protocol" (messages exchanged) I do not believe are documented, I'd like to find a solution that would allow me to capture (in sequence and content) the messages exchanged between the two devices. Can this be done with a PC and a GPIB card (attached as a passive device on the same physical bus?) I would like to avoid any hardware/software development for this task; an ideal solution would be a canned PC application but I'm not sure where to start looking or what to call such a thing.Thanks for any suggestions and also any requests for clarifying information.If this posting should be transferred to another forum group on eevblog forum, please advise.Thanks!

author: jmelson
author_rank: Super Contributor
timestamp: September 20, 2025, 01:26:07 am
content: What you want is a 16-channel logic analyzer and software. There are tons of USB-attached logic analyzer pods that can be used for this sort of task.Jon

author: ledtester
author_rank: Super Contributor
timestamp: September 20, 2025, 03:23:22 am
content: Have a look at this thread:https://www.eevblog.com/forum/testgear/is-it-possible-to-spy-the-gpib-bus-(prologix-ethernet-adapter)/It mentions some existing products that might work for you.There is also this Arduino project:https://github.com/Tek-User/GPIB-BUS-MONITORI've attached the schematic -- just requires some resistors besides the Arduino.

author: wb0gaz
author_rank: Frequent Contributor
timestamp: September 20, 2025, 11:50:26 am
content: Thank you, ledtester - and also the phrase "GPIB Bus Monitor" is a good description for what I'm trying to do, so just having that as a search term is a step forward!Dave
Need to reflash a bricked BIOS - Page 1
Forum section: electronics / projects

author: ImageJPEG
author_rank: Newbie
timestamp: February 14, 2019, 08:34:52 pm
content: Did a BIOS update. Even had the thing plugged into a UPS but the thing still got bricked.So, I'm looking at getting this:https://www.ebay.com/itm/XGecu-TL866II-Programmer-PLUS-for-SPI-Flash-NAND-EPROM-MCU-AVR-13-adapter-clip/192725987183?hash=item2cdf5d2f6f:g:PysAAOSwJ3RatMVW:rk:9:pf:0To reprogram a BIOS chip from a Lenovo M600.The chip is similar to this:http://www.bios-chip24.com/MXIC-MX-25U6435F-M2I-10G-64MBit-SPI-Flash-SOIC-8/enI can get the exact chip details in maybe a day.

author: wraper
author_rank: Unknown
timestamp: February 14, 2019, 08:46:36 pm
content: The question is, do you have actual firmware dump to flash? Firmware update which you can download on lenovo website is not suitable.EDIT: just checked that it's not a laptop as I thought, so probably downloaded firmware will be fine. But still not certain as it is not standard ATX motherboard.

author: wraper
author_rank: Unknown
timestamp: February 14, 2019, 08:59:57 pm
content: In any case I suggest saving corrupted bios backup before flashing new one. It might be useful for cooking working bios from incomplete update file.

author: DaJMasta
author_rank: Super Contributor
timestamp: February 14, 2019, 09:03:08 pm
content: There's a discussion of that programmer elsewhere, and it's decent, should do the job for you. Make sure that the bios file is the raw image if you're writing it with a programmer, not some other format that needs to be interpreted by the firmware installer, then you're probably alright.While it's unlikely in this case, I know some motherboard vendors were able to supply preprogrammed BIOS chips for their boards in the past - I think this is only likely if they are also socketed, which basically no laptop ones are, but it could be worth a customer service ticket.

author: ImageJPEG
author_rank: Newbie
timestamp: February 15, 2019, 03:04:47 pm
content: I was planning on reading and saving a BIOS image from a working computer of the same model. I'm in IT so I have quite a few of the same machine.The exact chip in question is:MXIC MX25U6473FM2I-10G8C428400B2L173695

author: JFJ
author_rank: Regular Contributor
timestamp: February 15, 2019, 05:32:00 pm
content: TheMacronix MX25U6473Fis in theTL866II Device Support List. So, copying the contents of one BIOS chip to another should be straight forward.

author: mikerj
author_rank: Super Contributor
timestamp: February 15, 2019, 05:38:22 pm
content: For a one off you can simply use an Arduino as a serial flash programmer, have a look for "Serprog". Works perfectly ok, if not the fastest.
Need Vishay BC 136 RVI series capacitor Crossreference - Page 1
Forum section: electronics / projects

author: jtronix
author_rank: Regular Contributor
timestamp: November 18, 2012, 03:41:45 pm
content: i want crossreference of 136 RVI series capacitor.i want this capacitor in SMPS which has input 24V and O/P: 90V /2Aother than 136 RVI series i tried capacitor but it fail after few hours or daysplease give me some good capacitor compatible to 136 RVI
Need Windows software for old PLD programmer Alta Pro 2000 - Page 1
Forum section: electronics / projects

author: digby70
author_rank: Newbie
timestamp: July 10, 2024, 08:23:35 pm
content: I am looking for the Windows software (I lost mine) for the Alta Pro 2000 PLD programmer that I constructed from an article listed in the February 2001 Poptronics Magazine.If you have this, please contact me.Thank you very much

author: RomDump
author_rank: Regular Contributor
timestamp: July 11, 2024, 02:31:11 am
content: Quote from: digby70 on July 10, 2024, 08:23:35 pm

author: digby70
author_rank: Newbie
timestamp: July 11, 2024, 06:29:43 pm
content: Thank you for the software!!! I was beginning to think that I would have to trash my PLD programmer.Bob

author: coromonadalix
author_rank: Super Contributor
timestamp: July 11, 2024, 09:15:07 pm
content: can be foundhttps://www.worldradiohistory.com/Archive-Poptronics/00s/01/PP-2001-02.pdfmore athttps://www.worldradiohistory.com/index.htm
Needed: Batronix PLCC44 to DIP40 adapter schematic. - Page 1
Forum section: electronics / projects

author: Kjelt
author_rank: Super Contributor
timestamp: March 29, 2019, 09:34:18 pm
content: Hi I want to update my Keithley 2001 firmware.Unfortunately the TL866 does not recognize my ST M27C4002 and my Batronix BX40 has no PLCC44 to DIP40 adapter.Also unfortunately the TL866 PLCC44 adapter does not work since instead of 0x0000 i keep on getting 0x2800 (unless my eproms are faulty.)Does anyone have a connection for the Batronix PLCC44 to DIP40 adapter ? Thanks !

author: Kjelt
author_rank: Super Contributor
timestamp: March 29, 2019, 10:20:49 pm
content: Never mind, found a workaround.I am going to build an adapter with the layout of the normal DIP40 version of the M27C4002 and tell the programmer it has a DIP40 package in the socket
Needing an Electronics engineer / designer for project - Page 1
Forum section: electronics / projects

author: jtronics64
author_rank: Newbie
timestamp: May 20, 2014, 11:04:15 am
content: I am looking for an Electronics Engineer to help build an electrical flow meter prototype. I have purchased an Arduino flow meter kit however this will need additional components including Bluetooth, Flash Memory and a Micro Energy Cell.If anyone is interested in Collaborating or making some cash please blog or email to; jrowe64@gmail.com

author: Sam__
author_rank: Regular Contributor
timestamp: May 20, 2014, 11:40:48 am
content: Not sure if this is allowed on the forum.That aside. Maybe you could give more details of the project. Motivation, more detailed explanation of the system etc.

author: Mechatrommer
author_rank: Super Contributor
timestamp: May 20, 2014, 05:43:27 pm
content: an ardooweinou you dont need a engineur to design one. this probably an insult

author: jtronics64
author_rank: Newbie
timestamp: May 21, 2014, 05:08:48 am
content: Thanks guys.The problem is I have no experience with building electronics, I am a Designer and an Architect - to speed up the prototyping process without me learning from scratch I was seeking the help either consultation services or a collaborated effort.The prototype / beta model would then be launched on a crowdfunding platform like kickstarter or indiegogo to seek inital funding for tooling and production.Concept:An interactive fluid consumption device to track and monitor your hydration levels - useful for Diabetics, Athletes and general health and well-being.A two part device and app. The device when fitted to a specific water bottle will calculate the consumption of water (through the flow sensor) then store this information (on a serial flash memory) for 24hr period and once synced with the app (through bluetooth) will manage any hydration goals and requirements.There is a couple of similar product currently on the market but the design and functionality is dreadful...http://www.hydracoach.com/http://www.blufitbottle.com/- im not trying to reinvent the wheel here just make it better.Please let me know if anyone is interested.

author: Psi
author_rank: Super Contributor
timestamp: May 21, 2014, 06:31:18 am
content: Set your location in your forum profile so people know where you are

author: Joule Thief
author_rank: Regular Contributor
timestamp: May 21, 2014, 07:13:14 am
content: Additional research may be needed to confirm if fluids passing thru the flow sensor will be fit for human consumption (residual mold release compounds, cleaning solution residues, etc.)
Needing to export vector based artwork from Altium - Page 1
Forum section: electronics / projects

author: kd6oji
author_rank: Contributor
timestamp: February 17, 2017, 04:34:07 am
content: I am hoping this is the proper section to post my query, if not please forgive me.I have created the artwork for my front panel using Altium as it was easy to overlay to match my PCB that holds my front controls. My enclosure provider does have the ability to print the front and rear panels for the final version of the project boxes. They do require that the artwork is provided as a vector based image, I have attempted to convert via Adobe Illustrator, however, I am very inexperienced with that application. I have yet to be able to get the scale correct to match the panel. I have exported as PDF but of course, that is not in color as I would like it to be.I have tried several google searches but have not found anything worthwhile, so was thinking maybe someone here would have an idea or point me in the right direction on how to accomplish this task.My project is located athttp://www.mach1electronics.comand I have a few JPG examples of my front panels I am hoping to get converted.Thanks in advance!ShawnNO7OR

author: T3sl4co1l
author_rank: Super Contributor
timestamp: February 17, 2017, 08:10:02 am
content: Why isn't it in color? Mine is in color...The setting is on one of the tabs if you're using Smart PDF or Export, else it's on the right-click "Page Settings" in the OutJob.You can export DXF/DWG too, which is vector, though not a format with much compatibility among conventional graphic vector formats.There are also Gerber to graphic converters. Gerber is nothing more than a special-purpose dimensional vector format. Again, not much compatibility to the larger graphical world, but there should be something.Tim

author: kd6oji
author_rank: Contributor
timestamp: February 17, 2017, 02:22:41 pm
content: I will give that a try, Thanks Tim.
Needs help on understanding the operation of this schematic. - Page 1
Forum section: electronics / projects

author: opa627bm
author_rank: Regular Contributor
timestamp: April 03, 2015, 01:13:18 am
content: Hi all,I have bought this power supply from a local auction and found out the reference was bad. After inspection, I realized that the thermostat in the oven assembly was bad and over cooked everything inside. I have attached the schematic. I am going to replace the +ref and -ref with LM399 and LT1001. But I am having trouble understanding the operation of the diff pair. Why they are biased differently. Why Q5B collector is connected to virtual ground but Q5A is connected to VG+Vref.Any inputs will be highly appreciated !
Negative high voltage low drop-out linear regulator - Page 1
Forum section: electronics / projects

author: dk-001
author_rank: Newbie
timestamp: June 04, 2020, 04:48:54 am
content: Hi,In my project I need a negative high voltage (-55V -- -60V) low-dropout voltage regulator. TPS7A33https://www.ti.com/product/TPS7A33is an example but it can go down to -36V. (it would have been great if MAX17651 had its negative version.)I've searched digikey but came empty handed. I would appreciate if there are any suggestions.Thanks.

author: moffy
author_rank: Super Contributor
timestamp: June 04, 2020, 06:36:07 am
content: Why do you need a low drop out regulator at such high voltages? Normally you can tolerate the 1.5-2.5v normal drop out voltage.

author: ycui7
author_rank: Contributor
timestamp: June 05, 2020, 02:41:52 am
content: There are two options.1. build your own linear regulator with pass transistor and voltage regulation circuitry. An example can be found in uA723's datasheet. There is a floating negative circuit that supposed to give you negative high voltage output. However, it did not work for me, as the resistor's value did not work as datasheet specified, also some parts are obsoleted.2. Take a 3 terminal regulator, like LM137, with normal voltage range, add some zener protection between input, output and FB pins to limit voltage differential to below 37V. The 3 terminal regulator is a floating regulator, it does not care what the real voltage is, but only care the voltage between the 3 pin, as long you keep the relative voltage below 37V, you are fine. The addition of zener diode make sure the voltage differential does not exceed 37V. This configuration is much simpler than #1 and worked for me.
Negative input, positive output buck-boost controller - Page 1
Forum section: electronics / projects

author: owiecc
author_rank: Frequent Contributor
timestamp: July 15, 2014, 09:52:01 am
content: I am designing a battery powered gate driver (I need very low C to ground and I will use it only to test the losses of a MOSFET). I decided I will use a Lithium Ion battery as a power source. I will also use this 3.7V voltage as negative gate voltage. So now I need to convert a 3.7V to the "on" voltage so I can control my MOSFET with -3.7/15V.Using negative battery terminal as reference I can boost the voltage to whatever I want + 3.7V. But then whenever my battery voltage drops my positive output gate voltage will change as well. I want this voltage to be constant and controllable.I thought I can make a buck/boost and convert my -3.7V to e.g. +15. Do you know any good, simple controller that can do it? LT hasLT8302but it does not accept my input voltage. Controller should work down to lets say -3.3V. The less external components the better. UVLO would be perfect. Signaling UV would be even better.

author: tszaboo
author_rank: Super Contributor
timestamp: July 15, 2014, 11:51:44 am
content: Inst it easter to make a boost converter and make 18V than use the battery and invert the voltage? Do you really need that negative rail? Usually I discourage voltage inverting, because it is a messy business.Also, If you are making a one-off circuit, cant you just take two 9V batteries and put them in series?

author: owiecc
author_rank: Frequent Contributor
timestamp: July 15, 2014, 01:15:04 pm
content: I explained why I don't want to boost in the second paragraph. My positive voltage becomes battery voltage dependent.I may need to make few of these later on so powering them from a single battery will be very easy. If I need two or three batteries per MOSFET it will be a pain to handle that.I have actually been tricked by the app note. LT8302 has an input voltage range of 2.8–40V. I will try to do do the circuit with it.

author: KX36
author_rank: Contributor
timestamp: July 15, 2014, 02:58:53 pm
content: There are non-inverting DC-DC converters which allow voltage above and below input, if that's something you prefer. There's the SEPIC, or even simpler is the flyback which is just a buck-boost with separate input and output windings to the inductor so that polarity doesn't have to be inverted. Almost any generic PWM controller will run any of these basic topologies if you set them up correctly. The MC34063 used in EEVblog #110 has example circuits in the datasheet for buck, boost and buck-boost, as well as a step by step guide to component selection and you could use that if you like.

author: owiecc
author_rank: Frequent Contributor
timestamp: July 16, 2014, 08:52:20 am
content: Quote from: AcHmed99 on July 15, 2014, 04:15:43 pmM may be for military spec.
Negative LDO with TL431 - Page 1
Forum section: electronics / projects

author: AcHmed99
author_rank: Contributor
timestamp: August 06, 2011, 11:52:06 am
content: I

author: amspire
author_rank: Super Contributor
timestamp: August 06, 2011, 05:17:43 pm
content: The TS431 looks pretty unstable in both sets of waveforms.I haven't used the TL431 in regulators myself, but a few things don't look right.Is C2 really meant to be across R3? I would think it would make the regulator overreact to transients which could cause those spikes.Also the power mosfet driving circuit looks pretty weird to me. -15v in and -12v out - that means 3 volts across the gates of the N channel FETs. So even if the TLS431 is trying to turn the Fets hard off, the two FETS are still getting 3 volts in total across both their gates - so the TLS431 cannot turn the FETs hard off if they have minimum gate turn on voltages.If the input voltage goes above 15V, I doubt there is any way the circuit could regulate. It is not a safe circuit.It would be much easier to use a P Channel power FET (Drain and source swapped compared to the 5838 fet) with the gate going straight to the TLS431, and the IRF034 removed - and C2 removed as well. Now if the TLS431 is hard on, the FET will turn fully off.The only catch is you need a bit more negative gate bias for the FET - 3v is probably not enough. If you are building the flyback supply powering this, there may be some tricks you can use to get a few more volts out to bias a P Channel Fet gate. For example, a capacitor from the 15V flyback transformer output (before the current diode) followed by a voltage doubler diode circuit using 1n914s would probably give you enough volts. You would definitely get over -15V.

author: Bored@Work
author_rank: Super Contributor
timestamp: August 06, 2011, 06:28:10 pm
content: Quote from: AcHmed99 on August 06, 2011, 05:59:19 pmBut that is the point. Negative linear voltage regulators are typically build as LDOs, because an NPN is easier to integrate. You get the LDO property for free when you buy a negative regulator. Even the 50 cent or maybe $1 LM7912 has a dropout voltage in the 1.5 V range. Your 15V input should be good enough for a 7912. 50 cent, maybe $1, and you are done.
Negative lm399 voltage reference - Page 1
Forum section: electronics / projects

author: rigrunner
author_rank: Frequent Contributor
timestamp: January 30, 2016, 07:54:11 pm
content: Searching throws up lots of reference circuits using LM399 but i haven't come across a simple negative reference.Is this the simplest way to get a buffered negative reference from an LM399?

author: Zero999
author_rank: Super Contributor
timestamp: January 30, 2016, 08:29:33 pm
content: That should work. Why do you think it should be a problem?

author: rigrunner
author_rank: Frequent Contributor
timestamp: January 30, 2016, 08:40:53 pm
content: It does work. I have it on a breadboard at the moment.I don't think there will be an issue with it but i thought i'd ask.

author: Andreas
author_rank: Super Contributor
timestamp: January 30, 2016, 08:55:14 pm
content: Hello,you have only to take care that the negative heater pin (Pin 4) has equal or more negatrive voltage than the anode pin of the reference (Pin 2).With best regardsAndreas

author: rigrunner
author_rank: Frequent Contributor
timestamp: January 30, 2016, 10:58:54 pm
content: Quote from: Andreas on January 30, 2016, 08:55:14 pmYes, i found that out earlier.I currently have positive heater (pin 3) connected to 0V and negative heater (pin 4) to -15V.
negative power supply - Page 1
Forum section: electronics / projects

author: electros6
author_rank: Regular Contributor
timestamp: March 29, 2014, 01:32:42 pm
content: I just need negative bench top power supply from 0 to -25V. Somebody tell me how to control negative voltage using transistor. please post some schematics

author: Dave
author_rank: Super Contributor
timestamp: March 29, 2014, 02:19:03 pm
content: You do realize voltage is just the difference of two potentials?Just use a regular 0-25V power supply and connect the positive terminal to your circuit ground.

author: tree
author_rank: Regular Contributor
timestamp: March 29, 2014, 03:45:24 pm
content: Keep in mind to make sure you know which outputs are floating and which grounds are earth grounds.For instance, you wouldn't want circuit ground connected to earth ground and the power supply has its negative output (black terminal) connected to the earth terminal and then you connect the positive output (red terminal) to the circuit ground. Then you'll get a short.

author: amyk
author_rank: Super Contributor
timestamp: March 29, 2014, 04:00:48 pm
content: Isn't something which supplies negative power usually called a load?

author: Dave
author_rank: Super Contributor
timestamp: March 29, 2014, 04:09:11 pm
content: Quote from: amyk on March 29, 2014, 04:00:48 pmThe voltage is negative and so is the current. The power output, however, is positive.P=U*I <-- Two negatives give a positive.

author: dannyf
author_rank: Super Contributor
timestamp: March 29, 2014, 04:54:17 pm
content: QuoteA (resistive) load can never supply anything.