hybridfree/eevblog-posts huggingface dataset:
Looking for a simple way to generate a reset pulse from a switch state change - Page 1
Forum section: electronics / projects

author: optoisolated
author_rank: Unknown
timestamp: May 29, 2019, 09:47:11 am
content: Hi All,I've been trying to find a simple circuit to generate a pulse on the state change of a switch. High>Low or Low>High. I'm using an ESP8266EX and in deep sleep mode (which i need to get anything resembling good battery life) the only way to wake it is to reset it. Cool, no worries. The ESP8266 will be used to monitor and report on the state of a reed switch, and i only really need to know if the state has changed in order to check in. Simple enough.. However I've been ripping my hair out trying to find a really simple and elegant way to generate a reset pulse to wake up the ESP8266 when the reed switch state changes.I could use a 74HC74 to generate the pulse on a low to high, but not on a high to low transition. I thought I could use an inverter fed into the same input with an OR gate, but that didn't work as intended.Any ideas or suggestions would be appreciated.I'm working on a greenfield project so i'm open to any and all ideas.Cheers

author: eblc1388
author_rank: Frequent Contributor
timestamp: May 29, 2019, 10:49:59 am
content: Look up the 74HC86, quad 2-input EXCLUSIVE-OR gate. You will need only one gate out of four. The remaining gates can be used as inverter if required.Wire one input of the XOR to the reed switch and wire the second input to the same point but via a resistor in series and a capacitor to ground. This is to add a RC time constant. When the reed switch changes state, a brief pulse will be produced at the gate output.

author: David Hess
author_rank: Super Contributor
timestamp: May 29, 2019, 09:40:46 pm
content: Eblc1388 suggested what I would have suggested. The RC delay can also be replaced by the other three gates in the '86 package in series if a narrower pulse width is acceptable.

author: optoisolated
author_rank: Unknown
timestamp: June 01, 2019, 04:35:25 am
content: That solution is both simple and elegant. Perfect! Thanks so much
Looking for a single chip waveform generator - Any suggestions - Page 1
Forum section: electronics / projects

author: bob_60
author_rank: Contributor
timestamp: June 01, 2014, 02:11:53 pm
content: Hi. I'm considering building a small Waveform generator that I can control from a micro. I thinkup to maybe 1Mhz is what I want. I could just buy a Rigol DG1022 but building one, sounds much more interesting.I would appreciate it if anyone could direct me to single chip solutions of reasonably quality.Regarding budget I think 10$ to 20$ for the chip is just fine.I primary need sine, square, noise and maybe pulse, but having to make a separate discrete circuit for noise is fine./Bo

author: theatrus
author_rank: Frequent Contributor
timestamp: June 01, 2014, 03:52:31 pm
content: Analog Devices has a whole host of options for DDS.For example:http://www.analog.com/static/imported-files/data_sheets/AD9837.PDFYou can also build an arbitrary waveform output using a DAC and an MCU/FPGA (depending on memory, clock, and speed needs - FPGA suggested)

author: geekbot
author_rank: Contributor
timestamp: June 01, 2014, 07:05:38 pm
content: AD9833, I think its the most popular among the Analog devices DDS waveform generation chips. You can google for many designs using this chip. Do post your progress. I was thinking of making the same thing, You can get modules from ebay which are cheaper than the IC itself
looking for a smaller pcb connector, like HE10 but smaller - Page 1
Forum section: electronics / projects

author: kripton2035
author_rank: Super Contributor
timestamp: October 23, 2018, 08:32:40 pm
content: and I would like a name for such a connectorI have a programmer (the mikroprog) that outputs on a HE10 connectorbut for an upcoming project I find it too largedoes it exist on a smaller footprint.I can soldier no problem to 0.8mmI could use pogo-pins for sure, but if there is a not too expensive connector I would prefer.thanks.

author: SiliconWizard
author_rank: Super Contributor
timestamp: October 23, 2018, 09:26:57 pm
content: https://www.amphenol-icc.com/product-series/minitek127-127mm.html
Looking for a source for a 24nH through hole inductor - Page 1
Forum section: electronics / projects

author: Tony_G
author_rank: Super Contributor
timestamp: April 25, 2017, 03:44:12 am
content: Hey all,I'm trying to source 24nH through hole inductor for a modification to a spectrum analyzer. I've found that Vishay have one that is close but it seems no one carries the range.Been to the usual suspects like DigiKey, Mouser, etch but the smallest TH inductor seems to be 100nH.Any suggestions?TonyG

author: rs20
author_rank: Super Contributor
timestamp: April 25, 2017, 03:53:24 am
content: If this is a one-off for yourself, just make an air-core inductor for yourself? It's a handful of turns at most. In fact, even a 28mm long straight piece of wire has an inductance of 24nH.What frequency does it need to work at? What is the nature of the modification you are making? How did you come to the conclusion that 24nH is the value you want?

author: Zero999
author_rank: Super Contributor
timestamp: April 25, 2017, 08:02:12 am
content: If you're designing the PCB, then how about making it part of the board by using a spiral PCB trace?http://coil32.net/pcb-coil.html

author: Tony_G
author_rank: Super Contributor
timestamp: April 25, 2017, 02:06:30 pm
content: Thanks all - The modification I'm making to the spectrum analyzer is in its cal signal output - Specifically converting it from 75 ohm to 50 ohm - So I'm trying to get a component that fits into the existing boards (the changes in component values, resistors and inductors, are the only differences between the 50 ohm and 75 ohm 3rd converter boards).The 75 ohm 3rd converter has approx. 75nH as the inductor whereas the 50 ohm one has 24nH. The frequency of the cal signal is 300 MHz.I looked at those Digikey bits but they're non-stock so the order would be around $350. The Abracon one seems to have the same issue as the Vishay one in that there isn't any stock available. Mouser is implying that the Delevan one is non-stocked but can be ordered in single quantities for $13 so I'll give that a try.Thanks again,TonyG

author: T3sl4co1l
author_rank: Super Contributor
timestamp: April 25, 2017, 02:09:01 pm
content: http://hamwaves.com/antennas/inductance.htmlDon't forget to adjust for lead inductance and such.Tim
Looking for a source of video balun transformer - Page 1
Forum section: electronics / projects

author: deephaven
author_rank: Frequent Contributor
timestamp: October 11, 2011, 09:51:03 am
content: I can get very cheaply a packaged passive video balun which serves to allow composite video to be sent down a UTP. What I can't seem to find is an off the shelf transformer so that I can put the balun on a PCB. Anyone know of a source?

author: gardner
author_rank: Regular Contributor
timestamp: April 29, 2014, 05:39:25 pm
content: This is an oldie, but I have the same Q.I would like to source a ready-made balun of the right bandwidth and impedance for NTSC composite, but I am uncertain what that would be. I suppose I can buy and tear apart a purpose-built balun and determine the core type and number of windings. If someone knows offhand the approx design parameters for a suitable balun I can wind my own for 4 or so parts that I need.I will also use some AD828 video amplifiers as drivers since there are issues with the output impedance of the NTSC camera I'm using.Thanks for any/all ideas.
Looking for a spice model of a limiting amp - Page 1
Forum section: electronics / projects

author: Circuitauger
author_rank: Newbie
timestamp: June 04, 2024, 06:34:13 pm
content: Does anyone know if spice models of limiting amps exist? Or is this just outside the realm of what a spice model can do.So far I’ve been unsuccessful at locating one from the usual sources.

author: moffy
author_rank: Super Contributor
timestamp: June 04, 2024, 11:31:26 pm
content: The OPA699 limiting amp has a PSPICE model:https://www.ti.com/product/OPA699?keyMatch=OPA699&tisearch=search-everything&usecase=GPN-ALT

author: Terry Bites
author_rank: Super Contributor
timestamp: June 06, 2024, 07:39:50 am
content: There are macros for this.
Looking for a strange standoff  NI SCSI connector  - Page 1
Forum section: electronics / projects

author: qwaarjet
author_rank: Regular Contributor
timestamp: April 22, 2016, 09:02:23 pm
content: The National Instruments SCB-100 has SCSI connector on the back that is threads with a 4-40 standoff however the female side is 2-56 that is use to secure the cable side. This is not a common standoff as far as I can tell, most have the same male and female threading. Does anybody have part number or know were to source these things? I need ~200 of them.TL;DRNeed 4-40 male to 2-56 female standoff

author: exmadscientist
author_rank: Frequent Contributor
timestamp: April 23, 2016, 06:07:15 am
content: McMaster has them, though they're obscenely expensive even by McMaster standards (and that's saying something!). You might also try the other big industrial supply houses.

author: qwaarjet
author_rank: Regular Contributor
timestamp: April 25, 2016, 04:51:42 am
content: unforgettably the ones on McMaster I found are to long at 1/2" need to be 1/4 or less for plug standoffs. My search on Fastenal and MSC yielded similar results mostly related to lack a granularity in the parametric search functions I.E. I cant search for different inner and outer threads

author: radar_macgyver
author_rank: Frequent Contributor
timestamp: April 25, 2016, 05:22:21 am
content: Digi-key has them. A23469-ND is a short female side, which is what I think you need. A23675-ND has a slightly longer female side.For future reference, search DK for "jackscrews" instead of standoffs when looking for these. I'm not sure what the difference is, but you will find the ones with the recommended height and threading, rather than having to guess.

author: qwaarjet
author_rank: Regular Contributor
timestamp: April 25, 2016, 02:32:38 pm
content: Thank you those look like exactly what I want. Its has been comical I've had 3 other engineers try to find these things for the last 4 days and turn up nothing useful.
Looking for a suitable DC -DC buck conveter  using coupled inductor /reactor  - Page 1
Forum section: electronics / projects

author: Md Mubdiul Hasan
author_rank: Regular Contributor
timestamp: September 05, 2019, 04:12:11 am
content: Hello there,Anser this post who knows Power Electronics well.Take a look my buck conveter in attachment.People may called it "Dropper'It has following properties,1. Input is 120 to 160 volt DC/ 30 Amp.2. Output must be 110volt/30 amp(maximum). +- 5% regulation( contineous output should be 20 amps)3. Isolated in both input and output circuit.4. Shunt sensing.5. proper feedback.6. 2 switches gets OFF/ON alternately.7. May be soft switching.8. May be 90% efficient.I am thinking to modify it because bulky reactor/coupled inductor.It has high current application.kindly suggest a design that has1. Less switching losss.2. Less stress on switch.3. Less number of component.4. ZVS or ZCS idea.5. Suitable ripple minimization.6. Suitable couple inductor design.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: September 05, 2019, 09:15:30 am
content: Voltage mode control? Two phase? Yikes!Yeah, get a current mode controller. You may need some kind of high side sensing, like Hall effect sensors.The inductors can't be coupled.Tim

author: Md Mubdiul Hasan
author_rank: Regular Contributor
timestamp: September 05, 2019, 01:22:38 pm
content: Sir Tim!Thanks a lot to recognize it.Not sure why you have raised " Phase" in DC-DC buck action.Because of 2 switch? Multiphase but not interleave?Looking at this circuit it seems like a 2 conventional buck converter working at a time or alternately ! Need to analyze both DCM and CCM mode for the inductor. If its not coupled inductor that means 2 inductors are not magnitically coupled!Can you see any " transformer" action on it?As its output and input currents are same, then yes ! Voltage should be control.Interesting to see its ON and OFF circuit. What would be the charging and discharging path in this circuit?No freewhiling action? 2 capacitors are helping charging or discharging through to load?Input power isolation has done with some transformer and optocoupler.Output can monitor by shunt sensing.Couple inductor is more cost effective but high current and voltage need to be carefully solve. High current IGBT is only solution?For HVDC application people use many IGBT in sequence !
Looking for a TI acquired Burr-brown OPA680U SPICE model - Page 1
Forum section: electronics / projects

author: bmxsesh
author_rank: Regular Contributor
timestamp: September 28, 2024, 01:55:38 pm
content: Does anybody know by the chance what software or website may have a SPICE model for Burr brown OPA680UTI application notes mention these are downloadable but search on their website does not mention this part numberDatasheet mentionsQuoteBut this company and their website no longer existsAny help appreciated,Thank you

author: Jacques
author_rank: Contributor
timestamp: September 28, 2024, 02:15:26 pm
content: Quote from: bmxsesh on September 28, 2024, 01:55:38 pmI'd recommend asking for the model at the TI E2E forum as well. In my experience they reply quickly and accurately. Note that if a SPICE model is still available from TI it will probably be a TINA-TI model rather than a 'generic' SPICE model. They switched to PSPICE like a few years ago, but TINA is still available from their site if memory serves correctly.

author: squadchannel
author_rank: Frequent Contributor
timestamp: September 28, 2024, 02:40:59 pm
content: Finally, I found it, thanks to WaybackMachine.I was able to download it from the official TI website.The document number was obtained from Waybackmachine's 2005 archive"sbom117"https://web.archive.org/web/20040627041636/http://focus.ti.com/docs/prod/folders/print/opa680.html#productmodelsand matched to the current TI download link.https://www.ti.com/lit/mo/sbom117/sbom117.ziphttps://www.ti.com/lit/zip/sbom117

author: bmxsesh
author_rank: Regular Contributor
timestamp: September 30, 2024, 03:14:38 pm
content: Quote from: squadchannel on September 28, 2024, 02:40:59 pmI appreciate it. In the meanwhile, I realized I should rather use some of the JFET input stage opamps like THS4631 since for CCD sensor I am working with it seems to only be viable to amplify very low currents

author: Doctorandus_P
author_rank: Super Contributor
timestamp: September 30, 2024, 06:17:58 pm
content: Oh gosh, did you read and comply to:* | Neither this library nor any part may be copied without |* | the express written consent of Burr-Brown Corporation. |before posting that zip file?Did you do that before downloading / copying that file to your own HDD / SSD?Such copyright texts are a quite big nuisance for the KiCad project. It's one of the main reasons nearly no spice models are distributed with KiCad's default libraries.
Looking for a very old Mallory capacitor document: "Bulletin 9-769" - Page 1
Forum section: electronics / projects

author: cvanc
author_rank: Frequent Contributor
timestamp: March 22, 2017, 07:40:48 pm
content: Can't find this posted on the Web, any chance one of you have it buried somewhere? Old bulletin discussing Mallory Type PVC film capacitors.Many thanks for any assistance you can provide!
Looking for actual ideas for millivoltmeter upgrade - Page 1
Forum section: electronics / projects

author: 001
author_rank: Super Contributor
timestamp: November 30, 2016, 01:26:46 pm
content: I`m looking for actual ideas to upgrade my analog germanium transistors based millivoltmeter (1uV-300V, 10Hz-5MHz, ±2.5%)Or to build totally new for funThat about nowday schematics for preamplifier and rectifier/detector?Thanx
looking for actuators / servo's - Page 1
Forum section: electronics / projects

author: Simon
author_rank: Unknown
timestamp: May 09, 2014, 07:42:49 am
content: I'm looking for some actuators, we used to use Bosch ones but between the plugs for them being like gold dust and their rising cost I think we need to look elsewhere. I did come across some made by a company in china called Woory but getting hold of them seems impossible, i either don't get replies or get bounce backs from any of their email addresses. I tried to phone them but got some bloke who thought he could speak English but in fact had very little idea of what I was on about.Has anyone else used Woory actuators or know of other supplier / manufacturers ?

author: tautech
author_rank: Super Contributor
timestamp: May 09, 2014, 08:14:57 am
content: I'm just in the process of sourcing some for a client from China.They were quick to reply to my Alibaba query and subsequent emails.http://www.linear-actuator.net.cn/They sent a datasheet and full quotation(requested)

author: Simon
author_rank: Unknown
timestamp: May 09, 2014, 08:35:05 am
content: Thank you, I'm actually looking for ones that do a 90 degree turn rather than linear and i think they are quite powerful whereas I'm just trying to move flaps in an air conditioning system to control air routes.
Looking for ADC eval board / other ready to go solution for a SIX wire load cell - Page 1
Forum section: electronics / projects

author: SpannersToSparks
author_rank: Regular Contributor
timestamp: August 08, 2019, 02:11:00 pm
content: HiI am in the UK and am looking for an ADC capable of processing data from a 6 wire (must be six and not 4, I have no choice in this unfortunately) load cell. The Texas Instruments ADS1232REF looks ideal but appears to be out of stock in the UK. One alternative is to ship from the US with digikey but the last time I ordered from them it took weeks. I am looking for something readily available.With that in mind can anyone recommend an alternative to the ADS1232REF ADC evaluation board?Cheers

author: splin
author_rank: Frequent Contributor
timestamp: August 08, 2019, 05:56:28 pm
content: How about the AD7193? Lower noise than the ADS1232 - 20.6 noise free bits v 19.2 @ 10SPS, 64X gain, similar INL (but only 4ppm typical figure given for the ADS1232 for gains >= 64). Page 31 of the data sheet shows the 6-wire load cell connections. Don't know how good the software is though.Evaluation kit in stock at RS:https://uk.rs-online.com/web/p/signal-conversion-development-kits/8031437/

author: SpannersToSparks
author_rank: Regular Contributor
timestamp: August 11, 2019, 04:53:28 pm
content: Thank you for your reply and apologies for the delay in responding.Would the AD7192 also work? It appears to have weigh scale functionality already built in and I am basically looking for a turnkey solutionhttps://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/eval-ad7192.htmlThanks!
Looking for advice for POE DC-DC converter - Page 1
Forum section: electronics / projects

author: globoy
author_rank: Frequent Contributor
timestamp: June 03, 2022, 11:36:30 pm
content: I'm starting development of my first power-over-ethernet device and coming up to speed. The design is cost sensitive but shouldn't present any difficult design parameters. From the POE DC-DC converter I'd like the following1. 5V @ 1A max (5W) - typ will be 600mA or less2. Support an auxiliary DC input. I think I'm flexible on this but would love something like a range of 9-48VDC (at least 12-48VDC). I guess the core DC-DC could be fed using a diode OR supply from either the ethernet jack or auxiliary DC input jack.I guess IEEE 802.3af applies for my power requirements.A design decision I'm exploring is selecting between a discrete design or using a module. I am curious about other people's experience and advice. Looking for suggestions for discrete controller chips and/or modules. And I imagine there are design decisions I'm not even aware of yet so any other advice would be appreciated.

author: ve7xen
author_rank: Super Contributor
timestamp: June 04, 2022, 01:18:34 am
content: Check out Si3406 that seems to meet your requirements. Skyworks has a design guide for this series that covers most of the details:https://www.skyworksinc.com/-/media/SkyWorks/SL/documents/public/application-notes/an1130-si3404-06x-dg.pdfYou might also find this thread interesting as we discussed the considerations a fair bit, and essele shows the 'discrete' 802.3af PoE DC-DC converter design they ended up with, that they say can do about 10W:https://www.eevblog.com/forum/metrology/yaugi-4-gpib-ethernet-poe-adapter/A module will certainly cost more in quantity, but for small volume, it will easily pay for itself in design and qualification effort.

author: globoy
author_rank: Frequent Contributor
timestamp: June 04, 2022, 04:21:16 pm
content: Thank you ve7xen. Both look like helpful links.
Looking for advice on an MPPT charge controller of sorts. - Page 1
Forum section: electronics / projects

author: vgamesx2
author_rank: Regular Contributor
timestamp: July 14, 2015, 05:21:21 pm
content: If you're reading this don't bother, read the edit instead..Hello, I just wanted to get some opinions on what people thought of these MPPT sort of a charge controller, does it look like it would work well for a small solar panel?http://r.ebay.com/Jblyndhttp://r.ebay.com/HLre9HI'm particularly interested in the second one as it says or at least implies that it has automatic MPPT with a pot to trim it, thoughts/opinions?Do you think should I get either one of those or should I just get something like an LTC3780? and.. before anyone asks why not a charge controller, because its a 35W panel so I mainly use it for charging 5v devices such as my phone/power bank, so any sort of linear regulator would waste a lot of that power.Edit: Alright never mind, it uses a chip named CN3722 and I just found this video which you can't clearly see how he has it setup but, either way it doesn't appear to actually work so... disregard this post and avoid these things.
Looking for advice on high-end Linux dev boards - Page 1
Forum section: electronics / projects

author: Sigmoid
author_rank: Frequent Contributor
timestamp: April 03, 2015, 12:31:46 pm
content: Hey,I've recently played around with a Banana Pro, which is a great little piece of hardware, and I decided to try and look into the possibilities of building a homebrew portable tablet PC to run Linux on. The vision being, pulling a 10-13" tablet assembly in a CNC'd case and a mechanical "60%" USB keyboard out of my backpack, and bringing some oldstyle cyberpunk to the Macbook crowd at Starbucks.Displays, even touchscreen ones are pretty available on AliExpress, and for a markup on Sparkfun or Adafruit. So I'm looking for possible dev boards I can utilize as the motherboard. Most embedded computer boards are way too closed and inextensible for a generic go-to PC. I've been checking theODroid XU3out, but awesome as it is, it still doesn't sound like a potential replacement for my 15" MBP.I'd prefer something that has a standard PC architecture, or something comparably powerful and open (as in no vendor-patched Linux kernel needed), standard ports and connectors for (preferrably notebook DDR3 or 4) RAM, mini PCIe, and the rest. Pretty much a Linux-friendly notebook mobo without the notebook, that doesn't cost more than a fully assembled notebook does, has at least some level of community support, and is available for single purchase (AliExpress is fine).

author: nixfu
author_rank: Unknown
timestamp: April 03, 2015, 12:53:50 pm
content: Look for atom based stuff. That is where you will find mini-PC type boards and computers. And they are x86 compatible and you are away from proprietary stuff like single chip computers such as Broadcom, various arm implementations etc...A micro-ATX system might fit your needs.

author: Marco
author_rank: Super Contributor
timestamp: April 03, 2015, 01:55:02 pm
content: Why not get a laptop motherboard?

author: Sigmoid
author_rank: Frequent Contributor
timestamp: April 03, 2015, 10:37:35 pm
content: They are usually big on proprietary solutions, like integrated flat cable connectors for the keyboard/touchpad assembly, or the display assembly. Which makes them a lot harder to hack than something that was built for generic use.

author: Marco
author_rank: Super Contributor
timestamp: April 03, 2015, 10:40:06 pm
content: They still have USB, so you can just use that for input. LVDS and eDP are relatively standardized so attaching displays is not an issue either.
Looking for advice/critique on Power Supply module schematic - Page 1
Forum section: electronics / projects

author: FotatoPotato
author_rank: Regular Contributor
timestamp: December 07, 2019, 06:37:22 am
content: Hello all,I've been spending a few days on a schematic for a DC-DC converter module that uses the LM22578 Simple Switcher buck converter as a tracking pre-regulator and it is set to output about 2V above V-Out. The 2 LT3081's are used as the linear output stages and they perform the voltage and current adjustment. The LT3092 is used to set the maximum output voltage however it may not be used in the end since I'm using some DAC's on a separate board to control the module. Finally the LM2682 is used to create a -10mA current source to allow the output of the LT3081's to reach 0V. This design is based on the popular DC2132 power supply but I've added a bunch of extra goodies that aren't really important here.For reference, I will be inputting 34v DC and the output will be adjustable from 0-32v @ 0-3A.In any case, I was wondering if you guys would mind taking a look at my schematic and give me some critique/advice on it, anything constructive is greatly appreciated! If you guys see any faults with my schematic or problems that would keep it from working please let me know.I look forward to getting some feed back!Thanks!
Looking for Alligator Clip rubber boots - multi colors - Page 1
Forum section: electronics / projects

author: rfdes
author_rank: Regular Contributor
timestamp: December 15, 2018, 02:19:26 pm
content: I am planning on making my own test lead clips and finding the silicon wire in different colors has not been a problem. However, finding the rubber boot (shrouds) for the clips has been a problem. If you are only interested in Red or Black, no problem. Other colors have been a challenge. I'm sure that I will be made a fool as someone will provide a link to a source but I am a big boy and can take the punishment.If anyone knows a source, I would appreciate the help.Take care -JimLargo, Florida USA

author: Richard Crowley
author_rank: Super Contributor
timestamp: December 15, 2018, 02:58:07 pm
content: There seem to be many available on Ebay, AliExpress, et.al.But there isn't much beyond white, yellow, blue and green (in addition to the common black and red)I would like to see the entire range of ten EIA colors.

author: rfdes
author_rank: Regular Contributor
timestamp: December 15, 2018, 04:25:43 pm
content: You can buy 'just' the boots in different colors? Please point out a link.Maybe my Google search criteria is poor. I've been calling them clip boots or clip shrouds.Thanks

author: edavid
author_rank: Super Contributor
timestamp: December 15, 2018, 04:55:51 pm
content: Mueller just calls them insulators, and they seem to be available from distributors to some extent.Example:https://muellerelectric.com/product/bu-36/http://stckcheck.muellerelectric.com/Home.aspx?mfg=75c91803-1a10-4f20-a938-117f4f93601c&parts=BU-36-@

author: rfdes
author_rank: Regular Contributor
timestamp: December 15, 2018, 08:05:02 pm
content: excellent!Thanks... I certainly appreciate your help.Take care -Jim

author: amlu
author_rank: Contributor
timestamp: December 16, 2018, 12:06:02 am
content: tidy solution may be to have cables terminated with 4mm test (banana) plugs, shrouded or bare depends what you going to use it for, have selection of bits to go with it, alligators, test hook probes etchttps://www.aliexpress.com/item/4pcs-Black-Red-Insulated-Large-Safety-Alligator-Clip-Made-of-Brass-With-4mm-Socket/1797485699.html

author: james_s
author_rank: Super Contributor
timestamp: December 17, 2018, 04:35:28 am
content: I just use black boots, it looks fine, it's easy to identify by the color of the wire.

author: duak
author_rank: Super Contributor
timestamp: December 17, 2018, 11:39:05 pm
content: I bought a bunch of Mueller 'gator clips and boots from Digikey. For the size I was using, they had all colors except for green. Go figure.

author: stratcat
author_rank: Newbie
timestamp: December 19, 2018, 04:25:40 am
content: I bought some recently from mouser.com for a similar project.Made by Mueller. They call them insulators.At Mouser, search: "Insulator for BU-30 Series Clips" and "Insulator for BU-70 Series"
Looking for an extra tall female header or equivalent - Page 1
Forum section: electronics / projects

author: kolyur
author_rank: Newbie
timestamp: November 12, 2024, 06:33:40 pm
content: I'm working on a design where I will have to attach another PCB to my board. The other board has a 2x10 0.100" shrouded male header and this cannot be changed. The distance from the base of this header to my PCB is 1.357" and is set by the mechanical design. I do have a bit of control over this distance but not much. I'm looking for a component that I can solder to my board to make this connection. The connection does need to be pluggable into the male header, although it will rarely if ever be disconnected. In a perfect world it would be a 2x10 female header with 1.357" insulated height, but the tallest female headers I can find are only about 3/4". There seem to be lots of options for stacking male headers but not the other way around. Any suggestions for how to achieve this? Thanks.

author: ebastler
author_rank: Super Contributor
timestamp: November 12, 2024, 07:01:21 pm
content: You could stack two female headers, if the upper one has suitable pins. (0.64 mm square cross section or such.) That would require that the two boards are held together mechanically by other means, of course. If the connection is not meant to be taken apart often, that should work.If you find a female header with extra-long pins ("wire wrap" style), you could also mount the header spaced away from the PCB. But I am not sure whether suitable spacers (with holes a t0.1" pitch) are available. Depending on the number of units you need to build you could 3D print someting. Or, if the plugging operation does not have to be very robust, you can get away with some simpler spacer which just defines the distance during the soldering step, or with no spacer at all.

author: Smile2016
author_rank: Regular Contributor
timestamp: November 12, 2024, 07:37:06 pm
content: has to be rigid? can't you just use a IDC ribbon CABLE? all lengths available..
Looking for an IC, not sure of it exist (USB Hub + VCOM Port) - Page 1
Forum section: electronics / projects

author: guscrown
author_rank: Regular Contributor
timestamp: June 09, 2015, 04:26:27 pm
content: I'm trying to see what options I have for connecting two devices to a single USB port.Device 1: USB KeypadDevice 2: Serial Display (TTL UART)I have a single USB port available, and of course one solution would be to get a 2-port USB Hub, add an FTDI Chip to one of the downstream ports and voila, I get two devices on a single USB upstream port.However, I wanted to see if there might be something out there in a single-chip solution, or a better way of doing this.Any ideas?

author: hendorog
author_rank: Super Contributor
timestamp: June 11, 2015, 12:46:26 am
content: Check out the Psoc range. There is a $10 USD eval board here which should do the job:http://www.cypress.com/?rID=108038There are some official videos on youtube about setting up USB profiles - so your keypad is recognised as a keyboard and the UART appears as a COM Port.
Looking for an odd thermal pad to hold 10 transistors - Page 1
Forum section: electronics / projects

author: cvanc
author_rank: Frequent Contributor
timestamp: July 24, 2019, 02:02:11 pm
content: See photo, the pad is 10" x 1" and holds ten TO-247AC transistors (5x IRFP240 and 5x IRFP9240).I know I could replace this with 10 discrete pads but if you know of a source for a long multi-transistor pad like the original I'd love to hear about it. Thanks.

author: ajb
author_rank: Super Contributor
timestamp: July 24, 2019, 02:24:17 pm
content: Lots of thermal materials are available in sheet form, just cut to size and whatever holes you need. Some can even be laser cut (like Laird's kapton-based thermal films) if you have access to that sort of equipment somewhere, but generally an xacto knife will do the job.If the transistors are insulated packages as in the photo, you don't necessarily need an isolator, silicone thermal paste (or equivalent) to ensure good thermal contact is all you need.

author: kjr18
author_rank: Regular Contributor
timestamp: July 26, 2019, 12:10:10 pm
content: Quote from: ajb on July 24, 2019, 02:24:17 pmThese transistors on photo do have a metal thermal pad on it's backside, so isolation is still needed.

author: Siwastaja
author_rank: Super Contributor
timestamp: July 26, 2019, 01:10:57 pm
content: Screws will happily penetrate most thermal pad materials, so I don't usually bother in ordering custom cut, or manually cutting.
Looking for an opamp with low input offset voltage - Page 1
Forum section: electronics / projects

author: trevwhite
author_rank: Frequent Contributor
timestamp: July 02, 2012, 10:15:50 pm
content: Hi. I am looking for an opamp that can handle +/- 18v and has lower than 1mv input offset voltage. I have found a TS514AID. This has Vos of 500uV. That is okay.I have looked at Linear and Analog Devices and there are loads of devices but they cost quite a bit. I was hoping for something relatively cheap. Maybe around the £1 mark?Is there a tried and trusted part that people usually go for that fits this spec?ThanksTrev

author: T4P
author_rank: Super Contributor
timestamp: July 02, 2012, 11:05:25 pm
content: If i wanted a low Iov opamp i still would go for chopper amps unless budget constraints kick in

author: ejeffrey
author_rank: Super Contributor
timestamp: July 02, 2012, 11:42:13 pm
content: Check TI, they have quite a few that match your requirements. The OPA277 and the LF411 are pretty standard parts that don't break the bank, but really there are lots of them. Probably from other manufacturers too. 1 mV is not a particularly stringent requirement -- most general purpose (i.e., not low power) opamps with transistor inputs will meet it. It can sometimes be difficult to find those in the midst of all the micropower CMOS stuff.Chopper stabilized amps are indeed the undisputed champions of low offset voltage, but it doesn't sound like you need that level of performance.

author: trevwhite
author_rank: Frequent Contributor
timestamp: July 03, 2012, 09:32:36 am
content: Thanks for the responses. I forgot to mention I am looking for a quad package.I would prefer a much lower offset. 0.1mv would be great but every time I find something it is quite a lot. There are a lot of opamps out there. I was just wondering if anyone knew of any specific ones that are cheap that have really low offset in quad package.ThanksTrev
Looking for an RF amp with gain of 1000. Or split gain two amps. - Page 1
Forum section: electronics / projects

author: Qmavam
author_rank: Regular Contributor
timestamp: December 17, 2024, 05:36:30 pm
content: I want to do some tests at levels of 1µV, 10µV, 100uV, 1mV, 10mV, 100mV, 1V and 10 V. I have an RF meter with a lowest FS range of 1mV. I would need amplification of the 1µV, 10µV, and 100µV settings. So may need adjustable gains of 1000, 100, and 10 on the amp. The amp needs to be a High input impedance and I would like a 50 ohm output impedance.Is there an inexpensive amp I can buy. I might be able to work with attenuatorsif I have a fixed gain of 1000.Anything commercially available at a low price?Thank, Mikek

author: Benta
author_rank: Super Contributor
timestamp: December 17, 2024, 07:20:51 pm
content: Perhaps you should mention the frequency range of interest? RF can be anything.

author: Qmavam
author_rank: Regular Contributor
timestamp: December 17, 2024, 07:55:34 pm
content: Yes, some additional thoughts. 100kHz to 1700kHz frequency range.The smallest signal I want to amplify is 1µV to read that on a 1mV FS RF meter,I need a gain of 1000. So may an amp with a gain of 20 and one with 50?I'm pretty lost on these high gains.Mikek

author: Conrad Hoffman
author_rank: Super Contributor
timestamp: December 17, 2024, 08:04:18 pm
content: Plus a filter stage because at those low levels you'll see nothing but noise. Ideally you'd want a tuned amplifier of some sort.
Looking for Assistance with development of current source using AD8276 - Page 1
Forum section: electronics / projects

author: irshath
author_rank: Newbie
timestamp: April 19, 2022, 04:58:44 pm
content: Hello,I want to create multiple outputs from a single AD8276 IC. I did not find any helpful stuff on the internet.Problem:Currently1. Input - Single supply (0 to 2.5V)2. Single outputI need:1. Input - Single supply (0, 2.5V)2. Output - Multiple needed (2 or 3)Thank you guys.

author: langwadt
author_rank: Super Contributor
timestamp: April 19, 2022, 05:01:01 pm
content: https://xyproblem.info/
Looking for beta testers for a new product - Page 1
Forum section: electronics / projects

author: erikka
author_rank: Regular Contributor
timestamp: February 22, 2025, 11:30:13 am
content: For a new product I'm looking for a number of testers, preferably in EuropeThe product will be a new member of the tiny devices family and has high resolution dual time stamping and frequency/phase/counting measurement capabilityFrequency/time/phase reference can be external or internal using a built in gpsdo.The accuracy is less then the tinyPFA but it has much more functionality.No specific test equipment availability is required but it's important to have a project that can benefit from the above functionality to ensure actual usage.If you are motivated to join the testing and do have sufficient time to frequently load, test and report on firmware updates, please send me a private message with some info on your project(s) and how you intend to use the product.If available, you can add some info on your experience and relevant test equipmentReplies to the list will be ignored.
Looking for blend pot. (MN taper, 9mm vertical) or slow fade x-fader schem. - Page 1
Forum section: electronics / projects

author: frozenfrogz
author_rank: Frequent Contributor
timestamp: January 16, 2020, 03:25:44 pm
content: Dear all,I need to blend two audio signals and currently I am using just a simple linear potentiometer. However, I would prefer a solution withslow fadecharacteristic or at least equal power. For bass / guitar instruments there are a bunch of 16mm pots with MN taper available. I need something board mountable, 9mm vertical package (like ALPS RK09 vert. or Alpha RV09) with metal axis. These seem to be very hard to come by.Can you advise for a manufacturer that has something like a dual non-parallel reverse log. in their portfolio?See here forreference to MN taper.Alternatively, can you point me towards a simple circuit that works with standard lin. or log. potentiometers and does not involve a bunch of extra components? I might be able to spare another one or two op-amps, but would prefer not to.Thank you and kind regards!
Looking for Buck regulator IC digital controlled Vout - Page 1
Forum section: electronics / projects

author: Sowlaki
author_rank: Newbie
timestamp: August 05, 2019, 05:46:07 am
content: Hello fellow EEvbloggers,I am building a USB PD 2.0 compliant PSU (Source) and need a buck regulator that can output voltages in the range 20V - 5V with a current of 5A at full load. However I am unsure how to control the output of the regulator since many of these buck ICs tend to be feedback controlled with a voltage divider network pulled by the Voutput of the regulator. Do you know any ICs with PWM control or I2C for example. The design will include a STM32 Cortex M0 for USB PD transactions.Thanks for any replys.

author: dazz1
author_rank: Frequent Contributor
timestamp: August 05, 2019, 08:01:32 am
content: HiIf you cant find a programmable device, you could put a DAC in the feedback loop. Instead of using a Vref voltage, you use the feedback output of the converter. The DAC then acts like a digital controlled potentiometer. You could also try digitally controlled potentiometer devices, often used in audio equipment.Dazz

author: ledtester
author_rank: Super Contributor
timestamp: August 05, 2019, 08:21:58 am
content: Here's a Maxim app note describing how to inject current into the controller's feedback input using a DAC:https://www.maximintegrated.com/en/app-notes/index.mvp/id/5058

author: voltsandjolts
author_rank: Unknown
timestamp: August 05, 2019, 08:49:44 am
content: PWM adjustment of Vout feedback signal:https://www.electroschematics.com/13953/mp2307-digital-power-supply-module-teardown-analysis-part-2-2/

author: ledtester
author_rank: Super Contributor
timestamp: August 05, 2019, 09:11:12 am
content: An interesting project which modifies cheap LM2596 modules into programmable power supplies:https://github.com/TG9541/stm8ef/wiki/Board-CN2596

author: Sowlaki
author_rank: Newbie
timestamp: August 05, 2019, 09:25:21 am
content: Quote from: dazz1 on August 05, 2019, 08:01:32 amYeah I was thinking about that, like manipulating the FB pin and have a separate voltage divider from Vout connected to an ADC on the MCU to make sure the voltage is correct. The digital pot seems like a very good choice too.Edit: I use Farne11 as my supplier and have to buy from their somewhat limited supply of PMIC. I figure I will go with a integrated MOSFET buck regulator that can output 20V/5A, like 3£ but seems like a reasonable price for what I get.
Looking for Buck Regulator suggestions - Page 1
Forum section: electronics / projects

author: gerrysweeney
author_rank: Regular Contributor
timestamp: August 16, 2013, 11:37:08 pm
content: Hi All,I am looking for a buck regulator capable of an input of >= 45V and an output of 10-40V out at 8-10A. Will almost certainly need an external switching FET. Any ideas?Thanks,Gerry

author: planet12
author_rank: Regular Contributor
timestamp: August 17, 2013, 02:59:36 am
content: If you've after a "jellybean" part, the UC3842/UC3843 can be made to work, but you'll need to provide a lower VCC for the chip (their maximum rating is 30V), and level shift the output drive up to meet the FET on the input rail. It's going to be problematic running these in current mode too, as you'd need to high-side sense the current and level shift down to the ground-referenced Isense input (or just tie Isense to ground and run in voltage mode).Similar things can be done with the venerable voltage-mode TL494 and SG3525 chips.For a more specialised solution - and a simpler to deal with overall one - the LM5085 from TI will directly take up to 75V input, and drives a PFET directly - along with current high side current sensing. It's only available in SMD packages, which may or may not be an issue for you.

author: gerrysweeney
author_rank: Regular Contributor
timestamp: August 17, 2013, 11:26:50 am
content: Thanks @planet12, the LM5085 part looks just about perfect. Now all I need to do is work out how to calculate the L for the thing. Thanks for the pointer.Gerry
Looking for Buzzer transformer for Piezo on 3.6V - Page 1
Forum section: electronics / projects

author: qno
author_rank: Frequent Contributor
timestamp: June 16, 2014, 08:17:15 am
content: Hello All,I want to make a piezo buzzer work on a single Li-ion Cell.These buzzers need 20 to 60 volts to make the sound level i need.I have tried a bridged connection but still not enough noise.After some googeling i found an application that uses a transformer.Has anyone used such a thing and more importantly where can I buy them.I have searched the usual Farnell/Mouser sites but I cannot find them.I need about 100 of them.Does anyone know?Thanks in advance.

author: Psi
author_rank: Super Contributor
timestamp: June 16, 2014, 08:22:06 am
content: what kind of current do you need at 20-60V?
Looking for Cairo SoC datasheet - Page 1
Forum section: electronics / projects

author: Godzil
author_rank: Frequent Contributor
timestamp: August 18, 2015, 03:22:48 pm
content: Hi everyone,I'm searching for the datasheet of a 80186 based SoC made by a Japanese company named Koto Lab ( who also work on the graphic part of the LSI Zevio SoC, and who are also the real creator of the Bandai WonderSwan)I've tried in the past to contact them to get the datasheet of this SoC with no success, as they concider this as a deprecated product they was reluctant to give any informations.As there is a lots of engineers here, maybe one of you get your hand on the datasheet of this chip? Or tell me on which device this SoC may have been used, I never found any information on it apart from older version of the Koto website. (see herehttp://web.archive.org/web/20071023111112/http://www.koto.co.jp/products/mono_sp.html)Why I'm so interested in this SoC that I don't even have a device that use it? Simply because it really look like it's the full version of the SoC used in the WonderSwan, they share so many similarity that I'm nearly sure that Koto designed first the Cairo, before going to make the WonderSwan for Bandai using the Cairo as a base. What make the Wonderswan so interesting? It's because it's the only x86 base portable device that I'm aware which does not use the same layout as a "legacy" PC, and it run for dozen of hours on a SINGLE AA battery!I'm sure that with a batterizer we would even get 8x more of fun with this gaming consoleWhat is really impressive in the WonderSwan consumption is that from the device use 3.3V as voltage logic, there as also some quite high voltage generated (21V if I remember correctly) and still it run on a single AA battery and is able to run for about 30 hours.Anyway, if anyone have information on this Cairo SoC (it seems they used LSI Corp/Logic for the fab of this chip) it would be nice if you could share the informationThanks

author: Rasz
author_rank: Super Contributor
timestamp: August 18, 2015, 05:47:26 pm
content: its not exactly the only handheld of that type, there was also Gateway 2000 Handbook 286, not to mentionatari portfolio

author: Godzil
author_rank: Frequent Contributor
timestamp: August 18, 2015, 10:15:37 pm
content: They are not really the same thing, both as IBM PC based laptop. The WonderSwan (and by extension the Cairo SoC) is 80186 based that's true, but it is not compatible with an IBM PC as it does not use the same IO/Memory layout.It's really one of the few x86 based device which is not basically an IBM PC.For exemple the US Post device that Dave made a teardown long time ago, or the Stanford Research SR430 he teardown-ed, they use x86 chip but are basically a PC embedded in a device (which run software/OS like MS-DOS/Windows that would only run on a standard IBM PC or clone).
Looking for Canare TCD-35A crimper dimensions. - Page 1
Forum section: electronics / projects

author: TERRA Operative
author_rank: Super Contributor
timestamp: February 22, 2018, 02:54:53 pm
content: I'm looking to get a crimper to make 50ohm BNC cables using readily available Canare BNC crimps I can get here cheaply in Japan, but I am having difficulty finding any dimensions on the Canare TCD-35D crimp die that is needed for these BP-C series 50ohm BNC connectors.I have found a document on the Canare website that has dimensions on many other models of their crimp dies, but not the one I need..I've also emailed Canare directly, but I've had no response yet.Does anyone know these dimensions, or have this crimp die that they could measure for me? I'd like to buy a cheaper crimper if possible, but I need those dimensions first.

author: TERRA Operative
author_rank: Super Contributor
timestamp: February 27, 2018, 01:57:28 pm
content: Well, I managed to get hold of Canare Japan, and got the dimensions.Here they are for anyone in the future who needs them.Pin Crimp: 1.92mm +/-0.02mm - squareSleeve Crimp: 7.6mm +/-0.1mm - HexSleeve Crimp 2: 5.85mm +/-0.1mm - HexAnd the drawing they sent: