hybridfree/eevblog-posts huggingface dataset:
Electronic load PCB manufacture - Page 1
Forum section: electronics / projects

author: jpk42
author_rank: Contributor
timestamp: September 18, 2016, 06:38:26 am
content: Hi all,I am designing a cased up ~300W electronic load for home use. All analog. I've designed the two PCBs for the unit and are looking at places to get them built. PCB GOGO seems like a reasonable choice, with a quote at $133 for both PCBs as a panel, shipping to NZ included. Any problems with them or can I get it done cheaper elsewhere? I can either panelize the PCBs with a V groove between them or send them off separately.Specifications for the PCBs are:Main board:310x1501.6mm2 layer2oz coppermin feature size 0.2mmmin hole 0.3mmFET board:250x591.6mm2 layer2oz coppermin feature size 0.2mmmin hole 0.3mmThanks.

author: wraper
author_rank: Unknown
timestamp: September 18, 2016, 06:59:10 am
content: Usually ordering separate PCBs is cheaper than ordering different designs in a single panel.

author: jpk42
author_rank: Contributor
timestamp: September 18, 2016, 07:15:15 am
content: Quote from: wraper on September 18, 2016, 06:59:10 amI plugged the numbers into PCB GOGO separately and got $72 for the FET board and $110 for the main board, so more than the combination in a panel. That was with separate shipping however. Can I combine shipping?

author: Siwastaja
author_rank: Super Contributor
timestamp: September 18, 2016, 08:07:54 am
content: Use pcbshopper.com. I have had no problems whatsoever with the cheapest Chinese providers, even though I have had some special requirements, such as a lot of fairly accurate routing. They even ship quickly.

author: wraper
author_rank: Unknown
timestamp: September 18, 2016, 08:22:44 am
content: Quote from: jpk42 on September 18, 2016, 07:15:15 amof course.
Electronic loads and loads - Page 1
Forum section: electronics / projects

author: PerranOak
author_rank: Frequent Contributor
timestamp: December 14, 2019, 08:37:50 pm
content: I would quite like to build an electronic load: a fun project, I imagine.Something small and simple: up to an amp-ish and, say, up to 20V-ish.Does anyone know of a good project/schematic they could recommend please?

author: MarkF
author_rank: Super Contributor
timestamp: December 14, 2019, 09:17:48 pm
content: This is what I built:Also check out J_Diddy_B's project:https://www.eevblog.com/forum/projects/dynamic-electronic-load-project/

author: Kleinstein
author_rank: Super Contributor
timestamp: December 14, 2019, 10:12:46 pm
content: One should get away without the trimmer for the reference. One may also get away without the buffer after the pot.On the other side it may be a good idea to limit wind up in case the voltage drops too low. This could be something like an OP limiting the set voltage at the switch to something like 3 times the load voltage. At low voltages the load would than turn over from constant current to constant resistance (e.g. 3 x the shunt, should be larger than shunt + FET R_on + Amp-meter).

author: MarkF
author_rank: Super Contributor
timestamp: December 14, 2019, 11:00:40 pm
content: Quote from: Kleinstein on December 14, 2019, 10:12:46 pmRight. I have not populated the trim pot. It's just on the PCB in case.The op-amp buffer after the voltage reference uses the 2nd op-amp in the dual package. It probably is not needed either.Edit: Without the op-amp buffer, the 10:1 voltage divider would be affected since the pot value is so near the voltage divider values.QuoteSorry, I don't understand what you are getting at.Maybe show a circuit...

author: PerranOak
author_rank: Frequent Contributor
timestamp: December 16, 2019, 03:09:28 pm
content: Cheers mate.What's "REF02"?

author: Ysjoelfir
author_rank: Frequent Contributor
timestamp: December 16, 2019, 03:11:44 pm
content: Quote from: PerranOak on December 16, 2019, 03:09:28 pmREF02 is a rather cheap but quite good 5 Volts voltage reference.https://www.ti.com/lit/ds/symlink/ref02.pdf

author: magic
author_rank: Super Contributor
timestamp: December 16, 2019, 04:42:06 pm
content: That's overkill. My active load uses a 2.4 zener (and those things are absolutely horrible in terms of stability wrt to temperature and bias current) and it still stabilizes to 1% of its long term load within seconds after adjusting the pot. And I run the power darlington's base current trough it since it also generates a virtual groundI suspect a TL431 would be about as good as anything in this application. The spec is less than 0.65% drift over 0~70°C temperature range, 0.25% typical.
Electronic Loads: CP, CV, CR.. how to implement? - Page 1
Forum section: electronics / projects

author: WillHuang
author_rank: Contributor
timestamp: March 08, 2017, 01:09:32 am
content: Hi everyone, I'm making an electronic load using a microcontroller. I'm wondering how to implement the constant voltage, power, and resistance mode?My problem is there's always a voltage drop along the conductor cables. If that happens, how do you truly get the desired output? For example, if I have a 5V input and I want a 1W constant power, I would need 200 mA. But at 200 mA, the voltage I measure is.. let's say 4.5V, making it 0.9W, even though the power supply is still outputting 5V. So, I am measuring 0.9W even though I am actually drawing 1W from the source. How do you get around this problem?

author: Fire Doger
author_rank: Regular Contributor
timestamp: March 08, 2017, 01:45:27 am
content: You can implement +-Sense cables which will measure the voltage directly from PSU output.Well designed PSU also have Sense cables to avoid voltage drop on cables.It is called 4 terminal sensing.

author: Kleinstein
author_rank: Super Contributor
timestamp: March 08, 2017, 05:56:17 pm
content: The CC and CV modes are somewhat similar to a lab power supply. The constant resistance mode is also possible to do analog or at least semi analog with an DAC used as a multiplier. The constant power mode is tricky, as this can be unstable in some cases. Even though it is possible to build an analog constant power mode one might be better of with feedback via the µC and this way have the option to chose from damping modes or warn if unstable.

author: hugo
author_rank: Regular Contributor
timestamp: March 08, 2017, 11:12:27 pm
content: Electronic DC Load 4 Part series by Scullcom Hobby Electronics :

author: lukaq
author_rank: Regular Contributor
timestamp: March 09, 2017, 08:06:47 am
content: yep, ^^ this should be good
Electronic Materials and Devices course by MITx starting soon on edx - Page 1
Forum section: electronics / projects

author: vinicius.jlantunes
author_rank: Regular Contributor
timestamp: May 17, 2016, 11:28:51 pm
content: As title says: what appears to be a very interesting course is about to start on edx (starts May 25th):https://www.edx.org/course/electronic-materials-devices-mitx-3-15-1x#I will not be able to take this one as I am taking one other series of courses from MITx on Supply chain (related to work) and they take A LOT of time. This other MITx course I'm taking is amazing, which is why I am posting this one here. Looks like their courses are a bit better than the edx average (even though most courses I've done there are pretty good).Good luck to anyone trying it!
Electronic metal hardware identification. - Page 1
Forum section: electronics / projects

author: nonsuchpro
author_rank: Contributor
timestamp: October 25, 2016, 12:30:34 am
content: Hey all.A buddy of mine recently hooked me up with a ton of old electronic components, hardware, parts, etc. As I was sorting I came across 2 types of items that my friend or I couldn't identify. I've added 2 pics below so if anybody knows what these are, I would appreciate the enlightenment.Thanks in advance!

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: October 25, 2016, 12:49:26 am
content: 1) feedthrough capacitors2) pins for connectors, these are riveted to some sort of strip, I don't know what they're called, but I've seen these used as binding posts in old TVs

author: nonsuchpro
author_rank: Contributor
timestamp: October 25, 2016, 05:20:44 pm
content: Quote from: Alex Eisenhut on October 25, 2016, 12:49:26 amWow. I would have never guessed feed-through capacitors for first pic. I was thinking some sort of jack.The pins in the second pic look like reeds for a Wurlitzer Electronic Piano that have been bent 90 degrees. I have a lot of these. I'll find a use for em.Thanks Alex!
electronic project about VOICE RECORD/PLAYBACK MODULE - Page 1
Forum section: electronics / projects

author: tomme1995
author_rank: Newbie
timestamp: August 01, 2019, 09:03:59 am
content: Good day~I am a engineer who like to make some electronic project by myself and I am also a distributor who sell consumer electronics and electronic components in3Celectrons mall,if you have any question about buy electronic product,or troubles in project, welcome to discuss with me. Today I would like to share a project "LOW NOISE MINI ELECTRET MICROPHONE PREAMPLIFIER" here.This Module has been designed around Nuvoton’s ISD1932 ChipCorder®, the newest single-chip multiple-message record/playback series with dual operating modes (address trigger and direct trigger) and wider operating voltage range from 2.4V to 5.5V. The sampling frequency can be selected from 4 to 12 kHz via an external resistor, which also determines the duration from 10.6 to 32 seconds. These ICs are designed mostly for standalone applications, and of course, it can be used in conjunction with a microcontroller.The two operating modes are address trigger and direct trigger. While in address trigger mode, both record and playback operations are manipulated according to the start address and end address specified through the start address and end address pins. However, in direct trigger mode, the device can configure the memory up to as many as eight equal messages, pending upon the fixed message configuration settings. With the record or playback feature being pre-selected, each message can be randomly accessed via its message control pin.The device has a selectable differential microphone input with AGC feature or single-ended analog input, analog in, under feed-through mode. Its differential Class D PWM speaker driver can directly drive a typical speaker or buzzer.Sampling Rate or Recording Time Selection R5: 53.3K 12 KHz sampling frequency 21.3 Seconds Voice RecordingR5: 80K 8 KHz sampling frequency 32 Seconds Voice RecordingR5: 100K 6.4 KHz sampling frequency 40 Seconds Voice RecordingR5: 120K 5.3 KHz sampling frequency 48 Seconds Voice RecordingR5: 160 4 KHz sampling frequency 64 Seconds Voice RecordingRefer Data Sheet of ISD1932 IC for More informationhttp://www.nuvoton.com/hq/products/i...32?__locale=enFEATURESWider operating voltage from 2.4 to 5.5VHigher sampling frequency from 4kHz to 12kHzVoice Recording Time 21 Seconds to 64 Seconds depend on sampling rate selection ( R5-OSC Resistor )FT: converts MIC+ to ANAIN & feeds it to the speakersR/P: record/playback switchREC: level or edge recordingPLAYE: edge-trigger, toggle on/offPLAYL: level playback or looping playbackLED: LED output for recordingLED Blinks for while at end of the message in play modeNORM (Address Trigger) : variable message durationMODE: (Direct Trigger) : fixed message durationThe complete article os here:http://www.electronics-lab.com/proje...d1932-isd1964/
electronic repair - Page 1
Forum section: electronics / projects

author: sayitt91
author_rank: Newbie
timestamp: January 25, 2018, 01:11:58 pm
content: electronic component MOSFET,RESISTANCE,.COIL,.DIODE,TRANSISTOR,.TRITER / TRIAC,.TRANSFORMER,IPM / IGBT MODULES AND TESTING,ANALOG INTEGRATION TESTS,TESTING WITH DIGITAL INTEGRATOR VI CURVES,testing of programmed microchip integrationsTEST METHOD WITH IMPEDANCE CHARACTERISTIC CURVESPOLAR T3000, POLAR T6000, PFL760, PFL780, HUNTRON 2000, HUNTRON 2700what are the character impedance shapes. can you help mepcb how to repair electronic card .PROGRAMMABLE MATERIAL TEST METHOD how to testBGA (BOUNDARY SCAN)How to test PROGRAMMABLE MATERIAL TEST METHODCould you give me information?Do you have pdf documentBEST REGARDS

author: bopstar
author_rank: Regular Contributor
timestamp: January 25, 2018, 01:37:29 pm
content: you ask allot
Electronic Scrabble with Spell Check. Is that posible? - Page 1
Forum section: electronics / projects

author: juriesnake
author_rank: Newbie
timestamp: December 19, 2013, 01:01:17 pm
content: hello. im juries from Philippines. a computer engineering student.i proposed a thesis project Electronic Scrabble.. its feature is to calculate the score but without spell check.. Panelist wanted to add a dictionary for this.. I am very confused if i going to continue this project.My problem is adding dictionary. Is there an MCU that can accommodate to those data? and how about its speed? please help me.Also, the IO pins which is too many. Which MCU should i use?

author: kxenos
author_rank: Frequent Contributor
timestamp: December 19, 2013, 01:54:53 pm
content: The first thing that comes to mind is a sorted (maybe indexed) list of words in a file in an SD card and a binary search algorithm (which has log(n) complexity). It shouldn't be that difficult.For the other questions you have to provide more information.

author: Bored@Work
author_rank: Super Contributor
timestamp: December 19, 2013, 05:58:50 pm
content: Adding a dictionary and checking words against is is building an own, simple spell checker. If this contradicts the instructions you got from your supervisor/TA/professor then you need to talk to them to resolve the contradiction.
Electronic Shelf Labels RF Protocol anyone? - Page 1
Forum section: electronics / projects

author: 0xPIT
author_rank: Regular Contributor
timestamp: March 06, 2018, 10:58:15 pm
content: Hey,I've got my hands on some old ePaper Electronic Shelf Labels by extinct company ZBD .The FCC kindly has some documents , yet they are incomplete and barely legible.I'm looking for a use for all those eInk displays.Can anyone help with the RF protocol, or does anyone have any further information on the labels?Cheers,pithttps://www.cdmconsultores.com/cms/images/files/ZBD_EPOP_500.pdfhttps://fccid.io/VC7120-0062/Operational-Description/operational-description-1183462
Electronic solvent droplets dispenser ideas? - Page 1
Forum section: electronics / projects

author: ricko_uk
author_rank: Super Contributor
timestamp: January 20, 2025, 09:30:27 pm
content: Hi,I have to build a one-off single droplet dispenser for solvents (to dispense drops on painted paper strips) to piggy back onto a solution sampling machine. Something as simple as possible.I tried with a valve but doesn't seem to be precise. I also tried with a solenoid pinching a silicon tube but wasn't precise either.Does anybody have any suggestions for something relatively quick and simple to implement?Thank you

author: coppercone2
author_rank: Super Contributor
timestamp: January 20, 2025, 09:41:46 pm
content: I think your ideas are correct but it needs some very precise mechanical hardware to execute your designIt's not easy, similar to engine fuel injector systems, alot of R&D went into making it 'cheap' for a very specific application. In essence its a micro metering pump

author: jpanhalt
author_rank: Super Contributor
timestamp: January 20, 2025, 09:46:04 pm
content: Use a needle of the appropriate diameter. For aqueous solutions, we used a 3mm diameter, flat bottom needle to deliver with reasonable accurately 0.1 ul of fluid to an agar surface. If you need to deliver a drop, use ultrasonics to make it drop (a suggestion by an engineer at Sandia many years ago). Of course, you need to adjust needle size to fit what you need to do. Dye solution is a common way to calibrate very small volumes.EDIT: BTW, I use a variation to apply small amounts of solder paste to a PCB for reflow when I do not have a stencil.

author: coppercone2
author_rank: Super Contributor
timestamp: January 20, 2025, 09:50:49 pm
content: solvents are harder because it pushes from evaporation. sometimes very substantially.

author: jpanhalt
author_rank: Super Contributor
timestamp: January 20, 2025, 10:05:15 pm
content: Are you sure the "solvent" isn't mercury? Anything with a volatility less than or equal to water is easy, even at 70°F indoors in tropical Minnesota in February. Now, methylene chloride or diethyl ether might be a different story in Panama or Vietnam. Maybe the TS will supply more information.

author: ajb
author_rank: Super Contributor
timestamp: January 21, 2025, 06:22:30 am
content: There are some very precise purpose-built valves available off the shelf:https://www.fisnar.com/products/dispensing-valves/vd510-diaphragm-valve/That company also has a lot of less exotic stuff that may do the job. No particular affiliation with them, but I bought a bunch of syringe dispensing stuff from them a while back and it was quality all around.

author: ricko_uk
author_rank: Super Contributor
timestamp: January 23, 2025, 08:16:07 am
content: Thank you all,@jpanhalt, that's a nice idea, I will try that next thank you.@coppercone2 yes, what jpanhalt suggested might help.@ajb, that is nice but at 800 USD not really an option.
Electronic switch - Page 1
Forum section: electronics / projects

author: Bael
author_rank: Newbie
timestamp: July 31, 2022, 05:26:55 am
content: Hi everyone!Hope someone can to help me with this.How do I make a circuit that is open when the voltage is below 13.5 v and closed when the voltage is above 13.5 v?I intend to connect it to an LED that should light up when the voltage is below 13.5v. Above 13.5v it should be off.It should be as simple and inexpensive as possible.Kind regards/ Bo

author: Mr.B
author_rank: Unknown
timestamp: July 31, 2022, 05:56:08 am
content: If you google "battery low voltage indicator circuit" you will find many, many examples.From the ultra simple to the ridiculously over engineered...

author: Bael
author_rank: Newbie
timestamp: July 31, 2022, 03:53:04 pm
content: Thanks, I'll give it a try.

author: rooppoorali
author_rank: Regular Contributor
timestamp: August 01, 2022, 12:05:20 am
content: I think a zener diode based circuit will help.

author: Bael
author_rank: Newbie
timestamp: August 02, 2022, 04:35:29 pm
content: Yes, I found a YouTube video.The entire circuit consists of 2 resistors, 2 zener and 1 LED.I've ordered the components and we'll see how it goes.
Electronic tabletop soccer - Page 1
Forum section: electronics / projects

author: FFL_LA
author_rank: Newbie
timestamp: January 16, 2018, 08:42:12 am
content: Hi I'm Alessio I'm 17 years old and I'm in my 2. Year of my apprenticeship as a electronic technician. I have this idea of a electronic tabletop soccer table(i don't know how it's called i'm from switzerland. But I'm more of a hardware guy and would like to build this soccer table with the help of you people. I thought of traking the ball with a infrared camera and controlling the players(the rod) with brushless motors as servos. The idea is that some skilled programmers (not me)can write a program that plays against a other program. Would love to hear some input of you, like what is the best hardware for the programmer or which system(mcu, rasp pi, a pc)And also it could tke some time because I'm stil going to school and have things to do.
ElectronicDesign.com archive? - Page 1
Forum section: electronics / projects

author: dobsonr741
author_rank: Frequent Contributor
timestamp: April 28, 2023, 01:36:53 am
content: The images of an article about rms conversion no longer loads on Electronic Design - do you know if they have an archival service, or perhaps some online library that has a copy?The article ishttps://www.electronicdesign.com/technologies/analog/article/21773084/extend-rmstodc-converters-range,specially the second part, when an AD8361 is linearized and extended in dynamic range.

author: dobsonr741
author_rank: Frequent Contributor
timestamp: April 28, 2023, 02:51:00 pm
content: SeekIC.com saved me- the schematics in question is this. BTW, it's a nice implementation of a precise rms converter can work up to the 100KHz range with high crest factors, as good as thermal converters.

author: tggzzz
author_rank: Super Contributor
timestamp: April 28, 2023, 02:55:53 pm
content: Quote from: dobsonr741 on April 28, 2023, 02:51:00 pmThat's a "global IC trading platform". How did that help with the schematic in a magazine?

author: dobsonr741
author_rank: Frequent Contributor
timestamp: April 28, 2023, 03:27:17 pm
content: SeekIC is hoarding schematics - this is the one from ElectronicDesign:http://www.seekic.com/circuit_diagram/Basic_Circuit/High_frequency_RMS___DC_converter_circuit_composed_of_AD8361.htmlI assume their business model is to catch search engine hits for all parts related.

author: tggzzz
author_rank: Super Contributor
timestamp: April 28, 2023, 06:33:37 pm
content: Quote from: dobsonr741 on April 28, 2023, 03:27:17 pmTheir own search engine doesn't show a schematic for ad8361. That's well hidden!
Electronics at the end of standard incandescent dimmer circuits - Page 1
Forum section: electronics / projects

author: westfw
author_rank: Super Contributor
timestamp: June 26, 2019, 01:13:56 am
content: Suppose that I want to replace an incandescent lamp on a standard triad-based dimmer circuit with some electronics.Say I want an LED circuit that changes the number of LEDs illuminated, or their color (RGB LEDs) with the setting, rather than just the power…As I see it, I’d need at least two “interesting” bits in my device:1) I need a regulated (and hopefully isolated) DC power supply that works on the nasty waveform put out by the dimmer. I guess something that rectifies the AC before anything else would be a good start, but it still seems that it would have to handle quite a large variation in input voltage. Are their standard circuits for this? OTS modules? (Maybe an “LED Ballast”?) It needs to provide 5V at maybe 10W-20 or so...2) I need a circuit (or more likely, firmware) that can detect the setting of the dimmer, either by measuring the intervals in the raw AC waveform, or perhaps by measuring the power supply input voltage after rectification.These both seem like they ought to be “solved problems”, so I thought I’d poll the community for ideas before I go off and try to invent the wheel…

author: David Hess
author_rank: Super Contributor
timestamp: June 26, 2019, 02:33:03 am
content: Dimmable ballasts designed to work with phase control dimming measure the average input voltage to detect the dimmer setting. Of course they are also designed to operate over a wider input voltage range.Incidentally, I tested some Cree dimmable LED lamps a couple weeks ago and found that they worked fine being dimmed by a variac instead of a phase controller dimmer. This might be an option for those who want dimming without all of the noise from phase control.
Electronics Australia 1993 article wanted - Page 1
Forum section: electronics / projects

author: merlinb
author_rank: Contributor
timestamp: July 18, 2015, 08:15:42 am
content: Does anyone have copies of these articles they would be willing to share? Electronics Australia is virtually impossible to get hold of here in the UKbut I thought the EEV forum might have a higher density of Aussies to askThiele, N, Some thoughts on the design of valve audio amplifiers 1, Electronics Australia, March 1993, pp110-113Thiele, N, Some thoughts on the design of valve audio amplifiers 2, Electronics Australia, April 1993, pp110-113

author: EEVblog
author_rank: Unknown
timestamp: July 18, 2015, 10:28:26 am
content: You can buy back issues from Silicon Chip magazine.I could scan them for you, but I think that date range is down in the bunker.

author: wagon
author_rank: Frequent Contributor
timestamp: July 18, 2015, 01:22:47 pm
content: I think I've got them too, I'd have to dig for them. They'll be in a big box behind the dead electric fence energiser pile.

author: merlinb
author_rank: Contributor
timestamp: July 18, 2015, 06:54:24 pm
content: Thanks for the quick responses everyone! I'll wait and see what Wagon turns up before I crack open my wallet

author: wagon
author_rank: Frequent Contributor
timestamp: July 20, 2015, 03:50:33 am
content: Quote from: merlinb on July 18, 2015, 06:54:24 pmI just had a dig, and success! PM me your address, photocopies will magically appear soon after.

author: merlinb
author_rank: Contributor
timestamp: August 04, 2015, 07:26:13 am
content: Thanks Wagon, the photocopies arrived as promised. Outstanding service!

author: EEVblog
author_rank: Unknown
timestamp: August 04, 2015, 12:52:57 pm
content: Quote from: merlinb on July 18, 2015, 08:15:42 amMy original PC oscilloscope project was published in the Feb 1993 issue. Memories....
Electronics book stores in Melbourne - Page 1
Forum section: electronics / projects

author: danntor
author_rank: Contributor
timestamp: December 29, 2011, 03:03:21 am
content: After a bookstore that sells electronics kinda books in Melbourne or engineering ones. More specifically Introduction to Radar Systems. Cheers for any help.

author: joelby
author_rank: Frequent Contributor
timestamp: December 29, 2011, 03:16:10 am
content: For relatively basic electronics stuff, Jaycar has a few titles. For advanced engineering texts, try some university bookshops, though at least at the Adelaide universities, UniBooks' range seems to have been scaled back considerably over the last 20 years and now mostly stocks course books. It's well worth checking out a university library, though.If you compare prices to Book Depository et al., you'll soon discover that engineering texts cost two or three times as much in shops here.

author: danntor
author_rank: Contributor
timestamp: December 29, 2011, 05:29:19 am
content: Should have added Jaycar had nothing. Very limited selection. Uni bookshops sounds like they would have it though. Cheers.
Electronics contest in DIY projects - Page 1
Forum section: electronics / projects

author: Pexy
author_rank: Newbie
timestamp: March 03, 2016, 12:27:22 am
content: Hello guys im 17 years old, I'm second year in electrotechnician divizion in high school. In April next year is going to be a contest among young creators in field of electronics. I would realy like to enter but i don't realy know what project to build. Could you guys give me a few ideas to help me spinn my wheels and maybe I'll go for one of your ideas. Please don't make imposible prepositions and nothing that will make me "homeless" when i buy the parts. Thanks for the ideas and tips.

author: HAL-42b
author_rank: Frequent Contributor
timestamp: March 03, 2016, 12:39:16 am
content: If you like digital design your own calculator using 74 series logic.If you like analog try a metal detector.You can do a musical instrument, like a Theremin for example.If you like robots do something with them.Make a camera to be attached to an animal.Too many choices....
electronics distributor / supplier - China - do you know "Kaimte"? - Page 1
Forum section: electronics / projects

author: GFTCTP
author_rank: Newbie
timestamp: April 26, 2021, 06:36:39 pm
content: Hello,I'm searching an components that is out of stock at digikey, mouser, and others most know suppliers. But, I found at Google a distributor that call "Kaimte", however doenst found any review or anyone talking about his.Do you know or bought any component at this site? It looks reliable for me.

author: Mecanix
author_rank: Frequent Contributor
timestamp: April 27, 2021, 09:21:57 pm
content: For China based supplies you might as well just use Aliexpress, Taobao.com, Tmall.com, etc. Probably where the supplier you've found source their parts anyway. Just guessing mind you, never had dealings with them.

author: Mecanix
author_rank: Frequent Contributor
timestamp: April 27, 2021, 09:32:09 pm
content: Their website/company isn't listed as 'authorized distributor' on the 3 first manufacturers I've just checked. Didn't bother checking for more...Therefore its fair to say you are on your own on that one...
Electronics inside of human bones to measure forces - Page 1
Forum section: electronics / projects

author: happylex
author_rank: Contributor
timestamp: December 25, 2013, 01:45:58 pm
content: I think people here can find this interesting. My colleagues from Berlin work with a kind of 'RFID' circuit to measure the forces inside of knee and hip joints. This helps us to identify why problems with artificial joint implants occur and how to design better implants.This is a 9-channel system:An article can be read here(not sure if the full document is public, but the abstract is).
Electronics Symbol Pack - Page 1
Forum section: electronics / projects

author: Chryseus
author_rank: Regular Contributor
timestamp: June 18, 2011, 09:57:17 pm
content: Don't you always hate is when schematic editors never have the symbol you need ?I certainly do so I've decided to make my own pack of symbols.These are of course completely vector drawn so you can resize them as much as you likewith no loss in image quality.I still need to add a few more symbols such as latches, shift registers, tubes, etc. But in any caseI will be making an initial release tomorrow, so if anyone is interested they are welcome to download.All these symbols will be made available completely free and open source.Comments and criticism welcome.EditYou can now download the symbol packhttp://chryseus8086.co.uk/?page_id=76here.

author: Unknown
author_rank: Unknown
timestamp: June 18, 2011, 11:59:06 pm
content: Hi Chryseus, I appreciate the issue with symbols you are experiencing.However, common (and not so common) symbols used in schematics are standardised in the industry. For example you can look on the IPC and IEEE. Besides these standards, many companies/designers use variations on symbols, eg to show the body diode of a MOSFET or resistors in a Darlington transistor.It will be impossible to capture all symbols used by everyone and the sistuation will be made worse by the introduction of more non-standard symbols by you.Alex

author: Chryseus
author_rank: Regular Contributor
timestamp: June 19, 2011, 12:38:34 am
content: This symbol pack is not intended for serious use, it is more for hobby use and in drawing educational circuit diagrams.For my use I don't really care or have need to keep with industry standards, as long as the function of each symbol is fairly clear.

author: Chryseus
author_rank: Regular Contributor
timestamp: June 19, 2011, 10:27:36 am
content: Quote from: Mechatrommer on June 19, 2011, 12:54:22 amAre you using a modern web browser that can display transparent PNG such as Google Chrome, FireFox or the latest version of Internet Explorer?It should be visible if you are.Here are alternative links:

author: Zero999
author_rank: Super Contributor
timestamp: June 19, 2011, 04:13:16 pm
content: Serious,y upgrade to the latest browser and install all the security updates to avoid virus and spyware. I'd also recommend scanning with Malwarebytes, just to make sure.

author: Chryseus
author_rank: Regular Contributor
timestamp: June 19, 2011, 09:06:17 pm
content: My symbol pack in now available.http://chryseus8086.co.uk/?page_id=76Please report any problems.

author: Zero999
author_rank: Super Contributor
timestamp: June 20, 2011, 09:22:19 pm
content: I hope you don't mind me uploading it here. Few people are going to mess around with a slow file hosting service and capture. I've also converted to ZIP which I know isn't so small but it's more accessible.

author: Chryseus
author_rank: Regular Contributor
timestamp: June 29, 2011, 05:27:32 pm
content: Updated pack with a number of minor fixes, next update will have more symbols.
Electronique Practique (French Construction Magazine) Software Files? - Page 1
Forum section: electronics / projects

author: Chris56000
author_rank: Frequent Contributor
timestamp: August 26, 2018, 06:17:53 pm
content: Hi!I came across an interesting project for what appears to be an Electrical Power Quality Monitor published in the September 1999 issue of the French Constructor's Magazine, "Electronique Practique".This project used an optocoupler to sample a low voltage tap from the mains–transformer secondary, filter and pick off any peak voltages, etc., and feed and count any peaks and troughs by means of an 87C52 microcontroller, analyzing & displaying the results on a 16 x 2 LCD display.However the 87C52 requires a control program called SURV220B.BIN or SURV220B.HEX – the text says it can be downloaded from their website, but I can't fathom out all that French!Any chances of obtaining this 87C52 dump?Do any of our French–speaking or understanding Members know if the Software Files from "Electronique Practique" magazine were made available for download anywhere like our EPE Magazine project files in the UK were?This looks like a really nice magazine that articles could be selected for translation from if we could also get any associated microcontroller dumps, etc., used in the projects!Chris Williams

author: kripton2035
author_rank: Super Contributor
timestamp: August 26, 2018, 06:56:35 pm
content: this magazine does not exist anymore. I don't think there is a web site alive.I'm ok to search that for you, but I have small hope ...

author: kripton2035
author_rank: Super Contributor
timestamp: August 26, 2018, 07:00:36 pm
content: you're lucky the webarchive has stored it for you ...

author: kripton2035
author_rank: Super Contributor
timestamp: August 26, 2018, 07:02:29 pm
content: here is the file for the 87c51 programmer of july 1999

author: kripton2035
author_rank: Super Contributor
timestamp: August 26, 2018, 07:03:17 pm
content: link to download all other files if you need :https://web.archive.org/web/20010331030759/http://www.eprat.com:80/services.htm

author: Chris56000
author_rank: Frequent Contributor
timestamp: August 27, 2018, 08:32:57 am
content: Hi!Thank you!I've got a UV erasable 87C52 off eBay from Canada at a reasonable price to do a test with, so now I need to check if the source needs to be amended to English (query in "Microcontrollers" Section), then if this works I can buy a cheaper OTP device to complete the project with!Chris Williams
Electroplating nickel onto copper - Page 1
Forum section: electronics / projects

author: drummerdimitri
author_rank: Frequent Contributor
timestamp: June 14, 2019, 11:17:04 am
content: I've watched some YouTube tutorials on this subject and it is working but not perfectly.No one explains the relationship between current and plating speed or goes into more depth scientifically.Should I use a wire brush to scrape the copper before plating it?The first time I tried this, the nickel plating started curling and flaking off. Not sure if this is due to too much current (500 mA) or a surface that is not clean enough or a combination of both.How do I get the perfect plating and is there a relationship between plating thickness vs time?

author: MagicSmoker
author_rank: Super Contributor
timestamp: June 14, 2019, 11:50:54 am
content: You'll likely have more success searchinghttps://www.finishing.com/index.htmlI only have tangential experience with nickel plating, but I do know that the surface must be very clean and thoroughly degreased. The usual process as I understand it is to degrease, rinse, etch (that is, dip in an bath that removes a thin layer of the base metal), rinse, plate.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: June 14, 2019, 08:26:50 pm
content: Cleanliness is paramount of course; wash the surface with detergent, solvent (acetone, say) and etch or activate with whatever is appropriate (a mild acid, or complexing agent, will remove oxidation; I don't know if Cu/Ni needs an activator but I can imagine there may be things for that too).AFAIK, nickel should go on thin, because it does indeed tend to curl off the surface. Too much internal stress. I don't know offhand if there's a way to control that, or if there's a bath or alloy mix that behaves good enough for thick layers.If nothing else, you could plate a little, anneal, clean and repeat, but that would be awful...Are you using a commercial plating bath, or winging it from chemicals? If the latter, good purity is needed, and probably some handy additives (a leveler like thiourea for example, at least for copper, but I imagine it works for nickel as well).Tim
Electrospray ionization - ion trap - detector  - Page 1
Forum section: electronics / projects

author: ChristofferB
author_rank: Frequent Contributor
timestamp: September 02, 2019, 10:10:25 pm
content: Hi all! So, this is an idea that's a bit out there, I just wanted some feedback if it might be worth pursuing.I'm on an ongoing quest to construct inexpensive detectors for gas chromatography/ liquid chromatography/HPLCThere's a lot of development in this area, since most common detectors for liquid chromatography (UV-VIS diode array detector, mass spectrometers, conductivity, refractive index etc.) are usually very costly and bulky.Basically, any detector that can detect peaks of dissolved molecules in a flow of liquid.Here's the idea: Make a mass spectrometer without the spectrometer.- Everything is housed in a very high vacuum chamber. Evacuated with a small turbo pump.- An electrospray ionization source to create a jet of charged particles. most of the solvent is removed here.- Maybe a simple electrostatic DC ion trap to suck away the lightest ions, acting as a mass low pass filter (might be needed to suppress solvent signal)- Faraday cup detector, femtoampere-scale amplifier, ADC.Do you see what I'm getting at? In theory, if you are certain only one compound will enter at a time you could in principle do away with the mass separation - you'd just want 'total amount ions other than solvent' as a function of time. Kinda like how a single wavelenght UV absorbance detector just detects "total amount of solutes at 255 nm" or similar.This would be mechanically much more straight forward to construct.--Chris

author: vindoline
author_rank: Unknown
timestamp: September 03, 2019, 07:19:26 pm
content: Not "out there" at all. I'm pretty sure that this is what we call a "total ion chromatogram" or TIC. It's a pretty good universal detector.

author: ChristofferB
author_rank: Frequent Contributor
timestamp: September 03, 2019, 09:35:48 pm
content: Thanks for the feedback!Yeah the output would be the same, but that's usually just a data display type from a regular chromatography-coupled MS. I don't think I've ever seen a dedicated instrument that does only that.
Elektor Precision Power Supply Dec 1982 repair improvements - Page 1
Forum section: electronics / projects

author: oz2cpu
author_rank: Frequent Contributor
timestamp: May 30, 2024, 08:11:03 am
content: I scored this power supply from a local marked,its design is : Elektor Precision Power Supply Dec 1982the implementation was full of errors, I fixed it all,so now I got a really nice extra supply,see all details here:https://youtu.be/ZeWiBPLUXrA?si=IXaLO073bgnQna6GAny one else got ? or made this power supply from Elektor ?

author: Doctorandus_P
author_rank: Super Contributor
timestamp: May 30, 2024, 08:53:43 am
content: It sure looks like a usable power supply.One thing that is not shown on the pictures are the heatsinks. A power supply like this needs a quite big heatsink. the combination of relatively high voltage and current can generate up to around 120W of heat in your setup. Such power supplies usually have a relay to switch between secondary winding voltages to reduce the heat (and needed heatsink size). (Edit: Oops, it's shown in the video, but I'm not going to watch all 40 minutes of it.)Tying a knot in the mains power cord is also .... frowned upon by many to say it carefully. Personally I am more concerned with the power switch. These tiny switches often have a mains rated voltage on them, but the meaning of that is that the switch is capable of switching such voltages, not that it is safe to do so. In it's current form the power supply also neither has PE, nor is it double insulated. My own preference would be to use a C13 socket on the back, and then connect the whole case to PE. But at the very least put some shrink wrap around the mains wiring, so that if a solder connection ever gets loose, it won't touch the housing and electrify it. I'm sure you've got plenty of experience to know such things. I don't know if care enough about such things to fix them though.

author: oz2cpu
author_rank: Frequent Contributor
timestamp: May 30, 2024, 12:27:19 pm
content: you can use the fast scroll bar to jump around the video time,it is almost as smart and useful as when you scroll in a web page to seek exactly the most important things fastest possible :-)so no need to see it all :-) different parts of it is for different people :-)and you are right, that heatsink is a bit too small for full load all day,maybe i can add a little secret voltage tap switch on the back ??both transformers got a lot of useful taps for this,less voltage = much less heat, let's say I need low voltage but relative high current out,I dont plan to make auto switch relays,I found the meter types he used, must be this type :Rohde & Schwarz Selektomat USWV BN15221 1960right here :https://youtu.be/qfgnnm4bHgQ
Eliminating earth switching noise - Page 1
Forum section: electronics / projects

author: lmagalhaes
author_rank: Contributor
timestamp: October 08, 2021, 10:44:49 am
content: Hi there,I have a PCB that has relays to turn on a pump motor, some electrovalves and a heating element inside a water heater. To detect the water level inside the water heater, I have a simple AC detection circuit that I copied from another PCB:The ground of my circuit is connected to earth because the water heater is connected to it as well. However, here's the issue: When I turn any of the electrovalves (230VAC) or the water pump, there's high frequency noise on the power rails. The microcontroller was resetting and going into some weird states on those ocasions. I tried adding some 11pF capacitors in parallel with the capacitors on the voltage regulators, which dampened the effect but the microcontroller was still going crazy sometimes. After removing the earth connection, the water level detection doesn't work but there is no more noise on the voltage rails and everything is back to normal. How do I stop this ? Does adding a ferrite bead with a roll off frequency well above the PWM frequency be enough for this ? And how do I even choose the specifics of that ferrite?

author: David Hess
author_rank: Super Contributor
timestamp: October 08, 2021, 06:30:10 pm
content: Can you connect the circuit ground to the same ground as the water heater?If you have an oscilloscope, use two channels to measure the difference between the two grounds.

author: lmagalhaes
author_rank: Contributor
timestamp: October 10, 2021, 09:30:39 pm
content: The water heater ground is Earth. That's why I'm connecting the circuit ground to Earth as well, but that makes me catch the switching noise =\

author: David Hess
author_rank: Super Contributor
timestamp: October 11, 2021, 12:29:10 am
content: But they connect to different spots in the distribution box if they are different distribution circuits, and maybe there is a wiring error. The usual solution when ground noise is suspected is to make sure all of the loads are operating off of the same distribution circuit with the same ground.

author: gogoman
author_rank: Regular Contributor
timestamp: October 29, 2021, 12:22:33 pm
content: Quote from: lmagalhaes on October 08, 2021, 10:44:49 amhello Imagalhaes, would you mind providing some insight regarding how the circuit detects water level?thanks gogoman
ELN-60-48D common output ground - Page 1
Forum section: electronics / projects

author: mrmp17
author_rank: Contributor
timestamp: October 28, 2015, 05:25:24 pm
content: Hi!I'm putting together a circuit that includes two ELN-60-48D led drivers and two high-power leds. There aren't many wires going to where the leds are and it would be great if I could connect the output grounds from each driver together and have only three wires going to leds; two positives and one common ground. But is this safe to do, since drivers are constant current sources?
Eload PC interface - Page 1
Forum section: electronics / projects

author: Harvs
author_rank: Super Contributor
timestamp: June 16, 2013, 03:29:47 am
content: As I'm sure a few of you will remember, I've been working on some eload projects with STM32 uCs. I know a few people who were interested in this having, like many on here, built their own purely analog models. However, pretty much whenever I explained what they need to do to put together a free tool chain for the ARM, everyone basically said words to the effect “it wasn’t for them” (I’m sure most will be able to imagine the more colourful language actually used here.)Ok fair enough, so I thought it wouldn’t be hard to port the basics across to the ever popular AVR. Well it turned out to be far more of a PITA than I thought, even though they both use GCC, going from a 32bit uC to the 8bit made it a pain to deal with large data types for all the scaling. Also I’d heavily used the DMA and other functions that the AVR just doesn’t have. So I pulled all the heavy lifting back to the PC, and have just used the AVR as an interface device to the ADC and DAC, and used its internal EEPROM to store all the calibration values.Enough about its origins. It’s going to be an Arduino compatible board with 16bit DAC for current set, and a 16bit ADC for the shunt current and input voltage measurement. The voltage input will have the ranging circuitry and protection on it. So it should be trivial to hook into a diy eload project. I think this has the benefit of people being able to undertake this popular project, and then easily add some serious functionality to it so it’s more than just a toy.Having completed most of the boring stuff, like the calibration utility, the uC code and the interface library, I’m putting together prototypes for the PC interface. Attached is one I just threw together last night to plot IV load curves for power supplies. In this pic it has just run a load test on a recom RBE-0505s isolated PCB mount 5V converter. I’ve personally wanted this automated capability for a while, because you can uncover all sorts of characteristics about a control loop from that sort of plot.I’m interested in hearing from anyone that might be interested in using the project, to get input on what sort of functionality would be useful. Of course, it’s going to be open (hardware and software,) and will be in the sub $20USD mark to build including PCB and parts (without psu as it’s assumed this would already be part of your eload project.)

author: Kevin.D
author_rank: Frequent Contributor
timestamp: June 16, 2013, 08:56:10 pm
content: I remember you where working on an eload project that was built into a pc case , Are you still working on it . ?

author: Harvs
author_rank: Super Contributor
timestamp: June 17, 2013, 04:07:35 am
content: Yeah I am. But it's taken a different turn. I'm using parts of that design now in my master thesis project, so I'm not sure how much of it in the end I'll be able to release to the public domain.