hybridfree/eevblog-posts huggingface dataset:
TO-71 PCB footprint - Page 1
Forum section: electronics / projects

author: Eamonn Harter
author_rank: Newbie
timestamp: November 01, 2018, 10:36:10 pm
content: Hello,I am designing a PCB that will use a TO-71 package component, and am trying to decide on the correct footprint to use for the layout. With pins in a 100mil diameter circle, there isn't much room to use for the pads and plated through-holes. If I had more space, I would probably go with 25mil diameter holes in 40-50mil pads. Should I not be afraid to spread the pins on the TO-71 component and use a wider hole/pad spacing for the PCB? Does anyone know what the standard practice is in designing a PCB that uses TO-71 components? The internet hasn't been much help on this question, and datasheets also avoid the topic. (The specific component in question is an LSK389 dual N-channel JFET from Linear Systems.)

author: T3sl4co1l
author_rank: Super Contributor
timestamp: November 01, 2018, 10:44:18 pm
content: Yes, normally the leads are formed to a larger circle, or to a DIP-6 or 8 pattern.Tim

author: floobydust
author_rank: Super Contributor
timestamp: November 02, 2018, 01:01:52 am
content: It's a really small part for 6-pins in basically a TO-46 can.You can splay out the pins to a larger circle but patience to install the leads. The part sits up anyhow.See here at the tiny pads if you keep the leads straight (0.1" dia.) verses a bit increased circle to 4mm dia.rad (0.157")This is what I came up with for a LSJ689/LSK489 pcb footprint. I haven't finished pcbs with it but the parts are here.Shown is 1.1mm pad (43thou) with 0.7mm hole (28thou) on 2mm radius, gives about 18thou clearance between pads.

author: Eamonn Harter
author_rank: Newbie
timestamp: November 02, 2018, 02:37:21 am
content: Thank you both for your replies. I like the idea of using a slightly larger circular pattern. I searched on JEDEC for an officially sanctioned footprint, but came up empty handed. I guess for some problems you just need to use common sense.

author: David Hess
author_rank: Super Contributor
timestamp: November 05, 2018, 11:17:41 pm
content: Just like with a TO-92, there is no sanctioned footprint.With a TO-92, the pins are on 0.05" centers so often the outer two holes are placed 0.1" apart and the center hole is offset 0.05" which is common for crimped TO-92 leads anyway. With a TO-71, you could use this arrangement on each side or just make it up as you go along.
To manufactor or not to? - Page 1
Forum section: electronics / projects

author: siyar
author_rank: Contributor
timestamp: August 17, 2025, 06:22:05 pm
content: Hi everyone,I’m currently struggling to land an entry-level PCB designer job and I’m looking for advice. My plan has been to improve my CV and skills by taking courses (like the FEDEVEL ones) and working on projects at home.I’m wondering though—does it make sense to actually get my boards manufactured? I tried once to assemble an SMD board, but it turned into a mess. I used too much solder, ended up with shorts on several pins, and even made a footprint mistake on one of the components. To fix it properly, I’d need to buy new equipment, which adds even more cost.That got me thinking: maybe it’s more efficient to just keep practicing in CAD. By the time I get a physical board working, I could probably complete two more virtual projects without spending extra money or waiting on delivery.What do you guys think? Is it worth the investment to build boards at this stage, or should I stick to CAD until I get more experience?

author: Grandchuck
author_rank: Super Contributor
timestamp: August 17, 2025, 06:33:20 pm
content: Honing your soldering skills is good but hardly necessary.Keep designing! Practice brings improvements.

author: jonpaul
author_rank: Super Contributor
timestamp: August 17, 2025, 06:36:05 pm
content: MOQ= min order qty 100-1000 units at ost assy houses.j
To our Russian members: What happened to this site? - Page 1
Forum section: electronics / projects

author: analogRF
author_rank: Super Contributor
timestamp: October 17, 2021, 11:02:23 am
content: This site was the most comprehensive website for smd component markings and part numbers and unfortunately it has disappeared recently.I was wondering if any of our Russian friends might know what happened to it:http://chip.tomsk.ru/chip/

author: Terry Bites
author_rank: Super Contributor
timestamp: October 17, 2021, 11:23:31 am
content: Putin had him arrested on a whim. Alegedly.

author: kripton2035
author_rank: Super Contributor
timestamp: October 17, 2021, 11:27:24 am
content: I confirm this was a really good site for smd markings ! (and I sub to this thread as well to know the answer ?)

author: voltsandjolts
author_rank: Unknown
timestamp: October 17, 2021, 12:25:14 pm
content: Another good one:https://smd.yooneed.one/

author: analogRF
author_rank: Super Contributor
timestamp: October 17, 2021, 12:25:50 pm
content: Quote from: voltsandjolts on October 17, 2021, 12:25:14 pmnot even close....

author: paul_g_787
author_rank: Frequent Contributor
timestamp: October 17, 2021, 03:06:02 pm
content: You can access an archived version of the site:https://web.archive.org/web/20210614161023/http://www.chip.tomsk.ru/chip/chipdoc.nsf?OpenDatabase

author: analogRF
author_rank: Super Contributor
timestamp: October 17, 2021, 03:15:39 pm
content: Quote from: paul_g_787 on October 17, 2021, 03:06:02 pmyes but it only shows one page for each starting letter...in the actual site there were 100s or even 1000s of pages for some starting letters...

author: floobydust
author_rank: Super Contributor
timestamp: October 17, 2021, 05:13:01 pm
content: The site saved my hide many times ID'ing SMT parts. I hope it comes back, or someone did a siterip.It seemed to be piggybacking on the city of Tomsk website.

author: amyk
author_rank: Super Contributor
timestamp: October 17, 2021, 11:16:34 pm
content: Yes, that was the most comprehensive SMD marking site too.I've heard thathttp://kazus.ru/datasheets/smd/index.htmlmight be an alternative, although not quite as easy to use.
To prevent reverse voltage flow - Page 1
Forum section: electronics / projects

author: oppel
author_rank: Newbie
timestamp: April 15, 2024, 05:28:09 am
content: We will create a battery bundle with the values ​​we want by connecting 2 batteries in series. We do not want the energy transfer between these serially connected batteries to be equal, and we do not want one to flow into the system more than the other. We do not want any short circuit events to occur. What kind of a PCB circuit can be created for this or would it be appropriate to use a diode?

author: Zero999
author_rank: Super Contributor
timestamp: April 17, 2024, 07:42:15 am
content: I can't understand that word salad.What's the application?
What is this TO247 mounting product? - Page 1
Forum section: electronics / projects

author: jakthingymabob
author_rank: Newbie
timestamp: August 24, 2016, 12:05:11 am
content: Hi,I want to use a solution similar to this in my design for mounting MOSFETS but i don't know where to buy these caps things from or what their official name is.Thank you for any helpJTMB
Toggle switch nut installation torque - how would you interpret this? - Page 1
Forum section: electronics / projects

author: DTJ
author_rank: Super Contributor
timestamp: December 23, 2024, 04:53:34 am
content: I'm using some IP68 toggle switches.How would you interpret this statement regarding the nut installation torque in the data sheet?Are they saying if the assembly is:==========================================Switch | bulk head panel | nut 1 | nut 2That the torque should be 1.5nm on each nut.==========================================Switch | bulk head panel | nutThat the torque on the single nut should be 0.7nm.Is my interpretation correct?Normally I'd not worry about this sort of thing but we are sorting out some moisture ingress issues.

author: ajb
author_rank: Super Contributor
timestamp: December 23, 2024, 05:12:37 am
content: I would take it to mean that the first nut is torqued to 0.7Nm, and second one, if installed, is torqued to 1.5Nm. The first one is there to retain the switch and in this case suitably compress the o-ring, the second nut is there to jam against the first and lock them into place. You don't want to overcompress the seal or overstress the connection between the switch body and stem, but you do want the nuts tight enough to not come loose, so that's what would make sense to me.

author: DTJ
author_rank: Super Contributor
timestamp: December 23, 2024, 07:00:27 am
content: Quote from: ajb on December 23, 2024, 05:12:37 amGreat - than you very much. That's very clear and makes perfect sense.
tone circuit help - Page 1
Forum section: electronics / projects

author: killaken2000
author_rank: Newbie
timestamp: January 04, 2012, 11:11:32 am
content: hello I am using the duncan amplification tonestack calculator to test the signal response of some the example circuits. For the life of me I can't get those same measurements when i do the simulations in MultiSim.I'm not sure how to go about getting similar results.any help would be great.I plan on maybe making building guitar pedals as a hobby and am interested in being able to show a graph on the signal response.thanks again,kennesson

author: jimmc
author_rank: Frequent Contributor
timestamp: January 04, 2012, 02:50:28 pm
content: Silly question but did you earth the lower end of the source, C2 & R4?(It seems to have been omitted from the diagram which doesn't make sense without it.)I've just run a simulation with the earth in place and it matched the response shown.Jim

author: killaken2000
author_rank: Newbie
timestamp: January 04, 2012, 10:44:29 pm
content: I think i'm doing ok. I used your advice and grounded the bottom of the schematic and everything looks alot better now. I'm using the Bode plotter and I get images similar to the one in the picture but the scales are different so they don't look exact but you can see that they start, stop, dip and everything else at the same places.Thanks for your advice. It worked a lot better this time with your help and a little sleep.----My problem now is getting the scales and ticks right to match the drawing. Its not completely necessary I just like way the Tone stack calculator looks.anyway, Thanks again.
Tone sound on fan - Page 1
Forum section: electronics / projects

author: DavidDLC
author_rank: Frequent Contributor
timestamp: April 06, 2011, 09:30:58 pm
content: I recently added a PWM controller to my desk fan in order to be able to modify the speed and therefore the amount of breeze.I can notice a squeak sound about 1 KHz I will say coming from the motor, and I want to get rid of it, what kind I do ?Regards.

author: dimlow
author_rank: Frequent Contributor
timestamp: April 06, 2011, 09:32:59 pm
content: Up your PWM frequency, I did that same once, the tone gets real annoying after a time

author: Simon
author_rank: Unknown
timestamp: April 06, 2011, 09:38:35 pm
content: When you power a motor the rotor will push forward as well as go round. if your using PWM to control it the shaft will oscilate making the buzing sound. I once knocked up a quike PWM controller for an 84W can blower to use at work, I soon installed an optional capacitor to increase the frequency. Lower frequencies got me more power less heating in the control transistor and a sqeek. The high frequency was silent but needed more power for the same speed but was more controllable at low speeds

author: Trigger
author_rank: Regular Contributor
timestamp: April 09, 2011, 05:57:50 pm
content: Somewhat related. I remember a talk at Blackhat that used that effect with some modulation to send the users password to a listener with a directional microphone and some signal processing.http://www.blackhat.com/presentations/bh-usa-08/Filiol/BH_USA_08_Filiol.zipHere, took me a bit to find it in the archives but it's interesting.

author: scrat
author_rank: Frequent Contributor
timestamp: April 11, 2011, 02:44:21 pm
content: Of course the increasing the PWM frequency will work.Why not trying with a little L-C filter, to smooth out the PWM carrier?

author: Simon
author_rank: Unknown
timestamp: April 11, 2011, 04:08:33 pm
content: well thought that PWM gave more torque to the fan at lower speeds than controlling the speed with lower DC voltages which is what an LC filter would do

author: Zero999
author_rank: Super Contributor
timestamp: April 11, 2011, 04:43:31 pm
content: Try increasing the frequency.

author: NiHaoMike
author_rank: Super Contributor
timestamp: April 11, 2011, 07:14:31 pm
content: Another trick is to try a spread spectrum clock.
Tone tracing PCB - Page 1
Forum section: electronics / projects

author: nicklinn
author_rank: Contributor
timestamp: March 29, 2017, 01:25:54 pm
content: Hello,I have a PCB (lots of layers) with some large value FPGAs that I would really love to play around with (powers on, voltages good, clocks tick). The problem is that I am having a hard time finding where the JTAG lines go. I have managed to find TDI, TDO and TMS on one device using continuity check on multimeter but TCL is proving elusive (and haven't worked out the other chip at all). I have access to the balls of the device through vias on the underside of the board so I could bodge some wire to it, but would much rather find out what is actually going on.So I have one of those telecom tone tracers, but I am kinda leary using it directly since the output is around 9V and that high of voltage is liable to cause damage, but building an injector circuit that uses a lower voltage (while using the more complex detector) doesn't seem that hard.Anyway before I spend a ton of time on this thought would seek some feedback, has anyone ever done this successfully (or unsuccessfully for that matter), or any thoughts of if this will even work?Thanks for your time guys,Nick

author: nicklinn
author_rank: Contributor
timestamp: March 30, 2017, 02:08:06 am
content: Quote from: evb149 on March 29, 2017, 07:12:18 pmGuess I should have expected this.... I will say that I do know what I am doing and I have the tools to do it. The board isn't a consumer/telecom type board it's a project dev board that outgrew the project. I have several excellent FPGA boards (dsp and uC too) and love them. Is it worth it? lol of course not but I have it and it sounds like fun so what the hell.Quote from: evb149 on March 29, 2017, 07:12:18 pmThanks for your reply.
Toner chip Ti046b1. Deep analize - Page 1
Forum section: electronics / projects

author: PON
author_rank: Newbie
timestamp: January 29, 2020, 05:18:54 pm
content: Hi to everyone,Based on this forum (https://www.eevblog.com/forum/projects/lexmark-toner-chip-ti046b1/?all#lastPost) i try to analize more deep this chip.Why deep analize?I have 3 resetter of Lexmark/Konica Minolta/Dell chip, and all of this resetter tell to some chip are BLOKED, or they can reset only some part (ex: 15%, 23%, 80%) from capacity.Capacity of chip are write on this chip. I read almost 200 chips in diferit situation, to see if this chip have some change in other place, not only in resetted block, but no diference.I dump the chip from 00>00 to 19>FF, to check if are some diference, but no. Information from 00_00 to 09_FF are the same with, 10_00 to 19_ff.I read on mono chip also 0x000 and 0x001. I try also to go on 0x002 and morestep, but no adress found.Why i want deep analize is becouse, in Mono carytidge if i try to tell in reset the chip have 0 page, the printer tell me to replace the cartridge, becouse have 0 pages remain, and after printer try to block the chip. I read and dump chip before put in printer, and have 100% reseting ( also with resetter i have not only with arduino), and after i put in printer, i try to read and dump the chip again, to check what printer change. The resettwr tel me in some case, can reset maxim 15%, or are block. But...., i reset again with ardui o and rewrite with old information, and after the resetter tell me is new, but only with maxim 15% of capacity, or, are blocked. But NEW.Can i find some good ideea to analize more deep this to check what change are there.Many thanks for ideea
Too many M2 bus connectors - Page 1
Forum section: electronics / projects

author: LM21
author_rank: Regular Contributor
timestamp: June 19, 2022, 07:42:18 pm
content: Digikey has 7 type 2199119 or M2 bus connectors in stock. Is there really any difference between them. Here is a link to my searchhttps://www.digikey.fi/en/products/filter/card-edge-connectors-edgeboard-connectors/303?s=N4IgjCBcoLQExVAYygFwE4FcCmAaEA9lANogCsIAugL7X4KSlxgCcLYrV1QASome have 15 and others have 30um gold but that's only 2 variants.

author: ataradov
author_rank: Super Contributor
timestamp: June 19, 2022, 07:50:26 pm
content: They also have different key slot position.

author: mariush
author_rank: Super Contributor
timestamp: June 19, 2022, 08:08:34 pm
content: There's also 4 polarizing key positions .. M.2 A/B/E/MKey ID Pin Location InterfaceA 8-15 2x PCIe x1 / USB 2.0 / I2C / DP x4B 12-19 PCIe x2 / SATA /USB 2.0 / USB 3.0 / HSIC / SSIC / Audio / UIM / I2CE 24-31 2x PCIe x1 / USB 2.0 / I2C / SDIO / UART / PCMM 59-66 PCIe x4 / SATAAs for your list , the datasheet has the explanation on page 2 :https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=2199119&DocType=Customer+Drawing&DocLang=English2199119 -3 to -6 is key M with different types of gold plating (gold flash / 10 / 15 / 30)-0 , -1 and -2 are type B , E and A respectively... and so on, variations in height and other parameters...May wanna check this one, as they have nearly 60k in stock, it's only downside seems to be the height of 4.10mm , which is a bit more than the others :https://www.digikey.fi/en/products/detail/jae-electronics/SM3ZS067U410AMR1000/4162230

author: Hydron
author_rank: Super Contributor
timestamp: June 20, 2022, 09:29:14 am
content: Be careful with the TE part numbering scheme for these - it's confusing and easy to get the wrong keying/height etc.I believe that there is a (semi)standard footprint though thankfully, so it is often possible to get alternative parts.On the same topic, has anyone got an up to date M.2 electromechanical guide they could share privately? There is a version 1.0 one floating around the net, but nothing more up to date, and I'm pretty sure there are some inaccuracies in it.

author: LM21
author_rank: Regular Contributor
timestamp: June 20, 2022, 10:23:51 am
content: OK. This is useful information, thank you. I think I have to order a couple of connectors to be sure. Too bad, It is TE parts with largest stock.Connector drawings, or datasheets as they call them, are usually quite bad.
Too much capacitance on TB6612FNG control pins. - Page 1
Forum section: electronics / projects

author: grrmachine
author_rank: Contributor
timestamp: April 29, 2019, 06:30:34 pm
content: Hi,I was reviewing a motor driver circuit based on TB6612FNG. To my surprise, I found huge capacitance on the motor control pins. Three caps (1206) 22u, 100n, 10n on PWMA, PWMB,AIN1,BIN2 pins.Is this normal? These pins are controlled by an Arduino UNO. CN1 (PWMA, AIN1) and CN2 (PWMB, BIN2) are driven by PWM. AIN2 and BIN1 are connected through a transistor (inverter circuit). It's implemented in a tiny robot with BO motors.I'm no expert in electronics, but PWM with that kind of capacitance on those pins seem fishy. Or is this setup normal? And the robot has problems travelling straight. When the same PWM is applied on AIN1 and BIN2 pins, the robot slightly goes off right.TB6612FNG's control pins draw about 25uA, neglecting the transistor inverter circuit here. The motor response should be sloppy due to the capacitance?Can someone help me understand this, What's the purpose of those caps there? The robot and UNO are powered by a 2S1P Li-ion battery.It's my first post here and I am sorry if this is the wrong thread.Excuse my bad English!Thanks for any suggestion and help.My best regards.
Too slow current limiting - Page 1
Forum section: electronics / projects

author: ZeTeX
author_rank: Frequent Contributor
timestamp: March 03, 2016, 08:19:44 pm
content: Hi,I'm designing a power supply and I ran into a little problem - the current limting with 0.01R resistor as a load with current set to 1V and voltage 1V it takes about 420us to enter current limiting.Why is it so slow? What is causing that?Here is the schematic:

author: Kleinstein
author_rank: Super Contributor
timestamp: March 03, 2016, 08:36:36 pm
content: The current regulation is rather slow because of the large value of C5. Also C5 can be charged to quite a different value than needed for the regulation to work. Here some limiting might help. Finally the limited slew rate of U2 (LT1013) could also add a little. c6 is relatively small but also adds a little delay.

author: ZeTeX
author_rank: Frequent Contributor
timestamp: March 03, 2016, 08:47:47 pm
content: Quote from: Kleinstein on March 03, 2016, 08:36:36 pmYhanks for the quick comment.After those changes, I got the current limiting speed to about ~30us but without any tests on various load to see if it would oscilate.I'm also driving Q1 in a different way now..

author: rx8pilot
author_rank: Super Contributor
timestamp: March 03, 2016, 08:50:30 pm
content: Where did the schematic come from (curiosity only). Are you able to post the Spice file?Since I was unable to answer the question, I wanted to learn more about the circuit.

author: ZeTeX
author_rank: Frequent Contributor
timestamp: March 03, 2016, 09:12:33 pm
content: Quote from: rx8pilot on March 03, 2016, 08:50:30 pmThe schematic came from agilent e3610A + ELV german psu, after learning a little bit I designed (still not finished) psu based on those schematics.attached is the spice file.
Tool for drawing simple 3-level waveforms - Page 1
Forum section: electronics / projects

author: blueskull
author_rank: Unknown
timestamp: September 11, 2020, 09:55:52 am
content: I was looking for a tool to draw simple waveforms. What particularly I wanted was to be able to draw 3-level (H, M, L) waveform and have a very easy to use interface (just feed in HMLHMLHML text sequence).I found none, and so I wrote mine based on Python using Logo (yes, that turtle) library.Not polished at all, but does what I wanted, which is just to visually aid my thinking process when designing logic circuit to decode a particular sequence.Syntax: python wavedraw.py input.txtInput.txt: just sequences of H, M and L, each representing 1, 0 and -1 in waveform height, each occupying one width. Standard height and width are defined in wavedraw.py in literals as well as canvas size.To draw multiple waveforms at once, add multiple sequences in the input file separated by LF (enter). CR is ignored.Have fun.

author: atferrari
author_rank: Frequent Contributor
timestamp: September 11, 2020, 12:56:17 pm
content: Whatever you post, make sure that most of the members can open the file.

author: pardo-bsso
author_rank: Frequent Contributor
timestamp: September 11, 2020, 02:13:06 pm
content: That's nice and simple.There's always wavedrom,https://wavedrom.com/tutorial.htmlbut it takes a bit to learn.

author: Mechatrommer
author_rank: Super Contributor
timestamp: September 11, 2020, 02:21:33 pm
content: Quote from: atferrari on September 11, 2020, 12:56:17 pmhere attached translated to WinXP Notepad compatible... it could still be useless to you anyhow... (i do have python environment but... nevermind)

author: RenThraysk
author_rank: Regular Contributor
timestamp: September 11, 2020, 04:34:25 pm
content: As a bit of fun whilst waiting for a chinese food delivery.A version in javascript that'll run browser, it only draws a single waveform.https://renthraysk.github.io/toys/waveform/

author: ejeffrey
author_rank: Super Contributor
timestamp: September 13, 2020, 05:15:50 am
content: Here's a code golf version using numpy/matplotlib:Code:import sysimport numpy as npimport matplotlib.pyplot as pltdata = open(sys.argv, "r").read()mapping = dict(H=1, M=0, L=-1)N = len(data)t = np.kron(np.arange(N+1), [1, 1])[1:-1]v = np.kron([mapping for x in data], [1, 1])plt.plot(t, v)plt.show()

author: mikerj
author_rank: Super Contributor
timestamp: September 14, 2020, 02:23:28 pm
content: I use the very handyTiming Editorutility for putting in documents etc. It's interface takes a little getting used to, but it's simple enough to use and will do three level states. What is really handy is you can break up the time axis to remove long lengths of constant states etc. and make a very compact diagram.

author: Renate
author_rank: Super Contributor
timestamp: September 14, 2020, 03:20:01 pm
content: I prefer "Z" to "M".
Tool magnetizer/demagnetizer - Page 1
Forum section: electronics / projects

author: liquibyte
author_rank: Frequent Contributor
timestamp: April 22, 2014, 09:29:25 pm
content: Anyone here ever built a magnetizer/demagnetizer? We used to have one where I worked that looked fairly old and was rather large and I haven't been able to find any sort of reasonable plans other than some dangerous looking stuff on Google. I'd like to be able to demagnetize larger tools like wire cutters, pliers, vise grips etc. but don't want to be tripping circuit breakers with things that behave like shorts.

author: Thor-Arne
author_rank: Unknown
timestamp: April 22, 2014, 10:06:38 pm
content: I have a old one, basically just a mains powered coil around a iron rod.I suppose making one from a old transformer would do.

author: calexanian
author_rank: Super Contributor
timestamp: April 23, 2014, 05:17:49 am
content: You can make one with a gapped core, a coil suitable for mains, and a variac. Stick the tool in the gap, ramp up and back down the variac and make sure you saturate the flux capacity of the tool.As far as magnetizing an iron tool, just touching it to a strong neo magnet works well. They sell cheap little tools for doing screwdrivers.
Tools required for low voltage (uV) Applications - Page 1
Forum section: electronics / projects

author: rakeshm55
author_rank: Regular Contributor
timestamp: April 22, 2012, 03:39:20 pm
content: Hi,What are the tools(Measurement/Source) needed to work on low noise low voltage low frequency applications like eeg?5uVp-p voltage level<100HzPLease help

author: grenert
author_rank: Frequent Contributor
timestamp: April 22, 2012, 05:12:32 pm
content: The old Tektronix 5000 series has plugins that meet your needs. Biomedical uses were common with that setup.http://www.i9t.net/5000_scopes.html

author: robrenz
author_rank: Super Contributor
timestamp: April 22, 2012, 05:13:13 pm
content: Register on the Keithley site herehttp://www.keithley.com/promo/wb/259and download the "Low Level Measurements Handbook" FREE. If you plan to work in this area you really need to thoroughly understand this material.

author: Unknown
author_rank: Unknown
timestamp: April 22, 2012, 06:21:23 pm
content: I second the recommendation of Keithley's low level measurements handbook.There are several versions of Tektronix's very sensitive differential amplifier. I believe there were two versions available as 5000 series oscilloscope plugins, there was the 7A22 for the 7000 series of scopes, and there was the AM502 plugin for TM5xx or TM5xxx mainframes. The latter has BNC output, and is therefore the most versatile (can easily work with modern scopes). Bandwidth is limited to 1 MHz and can be further limited (both lower and upper limit) with adjustable filters in most plugins. Differential inputs are almost essential at these levels.Note that there are safety issues with directly connecting electronics to the human body with low impedance electrodes. Investigate this first before even considering experimenting on living beings.
Top BGA rework station manufactures - Page 1
Forum section: electronics / projects

author: Glad_Boy
author_rank: Newbie
timestamp: September 12, 2018, 12:48:37 pm
content: Hi,I want to buy a top quality BGA rework station for our company . there are many chines choices which does not satisfy my needs, I want to know which top quality brands do you suggest?Any Pitfalls that should I know of?

author: Deus
author_rank: Contributor
timestamp: September 13, 2018, 03:28:19 pm
content: More info what you want to use it for and why the Chinese ones don't fit your need would be give a better idea what might suit you most...Doing BGA rework myself for think almost 10 years now using an Infrared BGA Rework station, which I really like.Probably has some disadvantages compared to hot air but also (more for me) advantages, which I really like.Not saying you should go for IR.When I got mine, hot air BGA rework stations where hard to find and very expensive.IR was affordable, fitted my budget so went for it.Now I got so used to work with it I don't see a reason to change.Some BGA Rework Stations I like and would consider if I had the budget:https://www.kurtzersa.com/electronics-production-equipment/rework-inspection-systems/rework-systems.htmlThink I might consider this:https://www.kurtzersa.com/electronics-production-equipment/rework-inspection-systems/rework-systems/produkt-details/hr-600-2-1.htmlFinetech, very expensive:https://www.finetech.de/products/overview-of-finetech-rework-equipment/Air Vac:http://www.air-vac-eng.com/BGA%20Rework_DRS25.htmlPace:https://www.paceworldwide.com/products/area-array-bga-rework/bga-rework-systemsHigh end IR machines examples:https://www.kurtzersa.com/electronics-production-equipment/rework-inspection-systems/rework-systems/produkt-details/ir-pl-650-1.htmlhttps://pdr-rework.comAbove machines are all made/designed (I think) by those firms themselves. Prices +25K, Fintech +50K, Air Vac probably higher.Then there are others like Manncorp, Precision pcb and probably some more selling (re)branded machines.If you go for one of the above brands, ask a demo with a machine for what you want to use it for. Let them see how it performs/works for your application. Or better, you play with it tooKee us posted maybe?

author: SiliconWizard
author_rank: Super Contributor
timestamp: September 13, 2018, 03:36:13 pm
content: Finetech equipment is very good - we had one in a previous job and it was fantastic.Pace is well regarded, but as expensive I think, if not more.One thing you have to consider is the component placement and inspection features. That makes a huge difference.

author: Stavos122
author_rank: Contributor
timestamp: September 23, 2018, 05:50:59 pm
content: Another option to consider - ATCO bga rework stationhttps://www.atco-us.com/products/at-gdp-smd-bga-placement-rework-stations. If you are dealing with fine pitch or ultra fine pitch parts, placement precision is an important parameter. If you have coarse pitch parts, less precise units will work since surface tension of molten solder will pull the parts in place even if they are somewhat offset.
top shelf PSU for DC ~3-12v output, minimal EMF for Halogen Bulb - Page 1
Forum section: electronics / projects

author: DonnieBrodan
author_rank: Contributor
timestamp: October 19, 2020, 09:52:04 am
content: Suggestions? Like a desk worthy PSU

author: m k
author_rank: Super Contributor
timestamp: October 19, 2020, 10:01:09 am
content: There used to be all kinds of halogen powers that now seems to have changed to led drivers.They were also guite bargains, maybe old stocks are still somewhere.Though don't know what's desk worthy for you, I wouldn't mind the appearance very much.

author: DonnieBrodan
author_rank: Contributor
timestamp: October 19, 2020, 10:53:39 am
content: yes but able to offer 12v right down to low voltage using a dimmer in the PSU
TOP224Y vs TOP224YN differences ? - Page 1
Forum section: electronics / projects

author: slowpoke
author_rank: Contributor
timestamp: October 09, 2014, 07:54:36 pm
content: Hi.Can i use TOP224YN instead of original TOP224Y ? Cant seem to find info on differences... (3terminal offline PWM switch,TOP224Y 75W).The board i'm trying to repair is very tough on desoldering (big groundplanes, heatsinks etc), so by accident i ripped one of the leads off (facepalm). (then again, maybe i'm just rubbish at this in general...)Ghrm...

author: German_EE
author_rank: Super Contributor
timestamp: October 10, 2014, 10:42:17 am
content: The YN version is ROHS compliant, there are no other differences (I just asked Mouser on your behalf because I was curious).

author: slowpoke
author_rank: Contributor
timestamp: October 14, 2014, 10:37:02 pm
content: Thanks.I'm having trouble locating analogues to parts that are end of life.Any databases i could consult ?

author: abpfischer
author_rank: Newbie
timestamp: July 16, 2022, 03:48:40 am
content: What does the TOP224YN do? I have a Miele Coffee machine and the electronic board has one of these that has split and cracked in half. The machine no longer powers up so I thought I might be able to replace this? There seems to be a residual voltage left through here from the capacitor.P.S. I am a complete novice.

author: Colt45
author_rank: Contributor
timestamp: July 16, 2022, 05:15:18 am
content: It's combined switched mode power supply controller and switchhttps://www.mouser.com/datasheet/2/328/top221-227-1512604.pdfProbably not the best thing to learn on, as there is no isolation and a few hundred volts on the primary circuit.

author: Gyro
author_rank: Super Contributor
timestamp: July 16, 2022, 08:46:44 am
content: Quote from: abpfischer on July 16, 2022, 03:48:40 amPlease don't double post...https://www.eevblog.com/forum/beginners/top224yn/

author: abpfischer
author_rank: Newbie
timestamp: July 16, 2022, 11:22:10 pm
content: Attached is a picture of the blown switch. What could cause that?

author: BrokenYugo
author_rank: Super Contributor
timestamp: July 18, 2022, 12:13:19 am
content: Seems a lot of these all in one SMPS controllers in appliances are known to just go bang. Still, check for shorted parts and bad caps.
Toroid Winder w/o cutting the wire. - Page 1
Forum section: electronics / projects

author: Oneminde
author_rank: Regular Contributor
timestamp: May 22, 2019, 09:17:19 pm
content: I am trying to figure out or access information on toroid winders which use continuous feed rather than loading a cartridge which has a finite amount of wire (length) it can hold. Surely there must be a version where this is not needed ?Does anyone have any sort of information that can help me ?
Toroidal power transformer question - Page 1
Forum section: electronics / projects

author: TimFox
author_rank: Super Contributor
timestamp: January 06, 2019, 09:30:13 pm
content: Medical-rated toroidal isolation transformers are readily available with two 120 V primary windings and two 120 V secondary windings.Some have 100 V taps on the primary windings.Since these transformers are rated for 50/60 Hz, I assume that it would be safe to apply 120 V, 60 Hz to the "100 V" taps, increasing the nominal output voltage from 120 V to 144 V. 120 V at 60 Hz requires the same core flux as 100 V at 50 Hz, so the core should still be below saturation.In this case, I also assume that the VA rating remains constant, and that therefore the secondary current ratings scale down by the same factor.Is this correct?

author: Zero999
author_rank: Super Contributor
timestamp: January 06, 2019, 11:23:20 pm
content: Yes, if the transformer is rated to 100V at 50Hz, it should be safe to operate it at 120V on 60Hz. The VA rating will not remain constant, but increase because the copper losses are proportional to the current.The hysteresis losses and insulation still limit the ultimate maximum voltage and frequency ratings, so don't try 1kV at 500Hz, but 120V will do no harm and it's already rated for 60Hz operation.

author: Dave
author_rank: Super Contributor
timestamp: January 06, 2019, 11:27:41 pm
content: No. The current capability of the transformer is limited by the cross section of the winding, as the losses inside a loaded transformer are predominantly resistive. You should be able to put more power through it than nominal.Edit: It seems that Zero was quicker.

author: TimFox
author_rank: Super Contributor
timestamp: January 07, 2019, 02:01:29 pm
content: Thanks for the replies. There seem to be no standard products with 140 V secondaries, so this seems to be my best option.
Toshiba TC58BYG0S3H BAI6 128mb nand  - Page 1
Forum section: electronics / projects

author: coolirc
author_rank: Newbie
timestamp: September 01, 2019, 07:32:18 pm
content: Hello can someone tell which socket it uses and how can i take a dump of it . any programmer i can buy to be able to program the nand chip , according to the pictures i can count 67 pins on it i don't know if the chip is an vfbga slc nand i think i did not find on the net a datasheet or something about it .

author: amyk
author_rank: Super Contributor
timestamp: September 01, 2019, 08:40:30 pm
content: That doesn't look like a valid part number. Do you have a closer and clearer picture of the IC itself?

author: coolirc
author_rank: Newbie
timestamp: September 02, 2019, 08:49:19 pm
content: yes i was actually wrong the correct part is TC58BYG0S3H BAI6i saw it as an BYSand it was actually a BYG

author: amyk
author_rank: Super Contributor
timestamp: September 02, 2019, 09:20:07 pm
content: That's better, I've attached a datasheet and it looks like this part is still in production. It looks like reasonably standard 1.8V NAND flash but it has built-in ECC.

author: coolirc
author_rank: Newbie
timestamp: September 03, 2019, 07:02:32 pm
content: Thanks for your reply , i actually have missflashed a wrong version of uboot on two routers now the routers won't boot anymore and i already found a programmer that programs the nand chip and the socket for it but it's expensive , the programmer costs 1500$ and the socket costs 460$ ... , i'm not a factory i want something cheap to program two or three routers of the same chip. that's what i'm looking for.
Touch activated 3 Way light controller - Page 1
Forum section: electronics / projects

author: VapinMason
author_rank: Newbie
timestamp: March 28, 2016, 03:30:42 am
content: EEVblog users,I am new here. Stumbled upon the YouTube channel several weeks ago. Looking to design a more robust controller for touch-activated lights. I have one on my nightstand that the controller went TU. Looking to create a surface mount PCB, which should be an upgrade from the through-hole construction of the old controller. The old controller is a TA-306A from Chia Chien Elect. Ltd. I just downloaded and installed KiCAD. I guess what I am asking is where should I start. I would need to find the appropriate microcontroller and base the entire project off of it. Any ideas on the right microcontroller?Joshua.

author: grouchobyte
author_rank: Regular Contributor
timestamp: March 28, 2016, 03:43:52 am
content: Usb powered, 100% dimmable via touch, low power and bright, cool operation, 5 for $10Reverse engineer it. It uses a PWM function from a cheapo PIC-like chinese Microcontroller. I have them all around my lab and home. They make great gifts.http://www.amazon.com/Aiqite-Yellow-Sensor-Dimmable-YM-USB-LED-01/dp/B01ABISN54/ref=sr_1_23?ie=UTF8&qid=1459136090&sr=8-23&keywords=usb+dimmableLook at the Microchip 10F series or whatever meets your form factor requirements
Touch button and slider design - Page 1
Forum section: electronics / projects

author: ypkdani
author_rank: Newbie
timestamp: October 28, 2019, 11:12:14 am
content: Hello all,i have a problem with my first design of a touch button and a slider on a 4layer pcb (top-layer2-layer1-bottom) using a STM32L162 with its peripheralTouch sensing. As you can see from the image i have design the button and the slider with a shield to increase the noise immunity. My problem is a) the sensitivity that is not enough b) reduce the noise from the leds on the bottom that light up the device.Up the pcb i have 2mm of plastic so i need to increase the sensitivity of the buttons for detect the slider or the button press. My ideas are:separe the shield for the button and the slider that now is the sameto increase the diameter of the button copper from 1.5mm to 3mm and the button shield from 1.5mm to 4mm.increase the gnd plane on the bottom where there are the leds for reduce the noise from theseincrease the width of the slider from 1cm to 1,5cm and the shield from 1,2 to 2cm if possibleIn the image you can see the signal from the button, or slider, from the channel 1 and the shield signal from the channel 2.Do you have other suggestions??Thanks
Touch Button - Page 1
Forum section: electronics / projects

author: Dat Tran
author_rank: Contributor
timestamp: February 25, 2016, 03:06:20 pm
content: Any body help me!!!I want to create a touch button on PCB using Altium software but i can't!Thank in advance!

author: Dat Tran
author_rank: Contributor
timestamp: February 25, 2016, 03:32:40 pm
content: Can you help me?
touch circuit  - Page 1
Forum section: electronics / projects

author: heshamvanora
author_rank: Newbie
timestamp: June 30, 2022, 08:47:23 pm
content: hey alli wandered how to make touch circuit like this one i've searched many times on the youtube but i can't found anything to help me making one like this one

author: Benta
author_rank: Super Contributor
timestamp: June 30, 2022, 08:53:58 pm
content: What is it? A bed?

author: tooki
author_rank: Super Contributor
timestamp: July 03, 2022, 02:29:00 pm
content: Quote from: heshamvanora on June 30, 2022, 08:47:23 pmMaybe you shouldn’t limit yourself to YouTube searches? There’s lots of great information in existence in this old-fashioned thing called “text”.Google for “capacitive touch sensor design” and you’ll find tons of information from chip makers and more, covering not only circuit design, but construction methods for the control panels themselves.
Touch displays for kiosk project on the Cheap - Page 1
Forum section: electronics / projects

author: speechsupply
author_rank: Contributor
timestamp: January 17, 2020, 11:44:11 am
content: Hello all,I am looking around for resellers of touch displays in the size of 13-15".There are tons Industrial PCs that fit the bill, but they're are spec'ed for industrial settings.What I am looking to build, is something similar to:http://comfiletech.com/categories/linux-panel-pc.htmlBut I would prefer to build my own enclosure and electronics.Would really appreciate links or references to sellers!Thanks!
touch screen protector - Page 1
Forum section: electronics / projects

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: March 28, 2020, 12:59:51 am
content: I have a metal case with screen protector for my phone. They no longer make this model case. The plastic is cracked. I want to make my own if possible.What kind of material should I use? It must be specific for this application to let touch screens work?

author: coromonadalix
author_rank: Super Contributor
timestamp: March 28, 2020, 03:09:16 am
content: an photo of your case could helpis it a thick plastic protector, a film ??

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: April 17, 2020, 05:58:43 am
content: Oops, finally decided to look at this again.
Touchscreen film to a 14.1" TFT LCD - Page 1
Forum section: electronics / projects

author: DiTBho
author_rank: Super Contributor
timestamp: January 05, 2021, 09:50:32 pm
content: I have a 14.1" TFT LCD, it's 1024x768 pixel 4:3, and I'd like to add a resistive film on it in order to convert it into a touchscreen.If this crazy thing makes sense, is there any place from where you recommend to bought it? and a USB controller for it?

author: DC1MC
author_rank: Super Contributor
timestamp: January 05, 2021, 10:05:44 pm
content: Of course it makes sense everybody is doing it, and the only reasonable price is Ali, the biggest difficulty is the 4:3 aspect ratio, the available 14' are not 4:3, and the available 4:3 are not 14"14" but not 4:3https://www.aliexpress.com/item/1005001523985588.html4:3, but not 14"https://www.aliexpress.com/item/33013349786.html

author: DiTBho
author_rank: Super Contributor
timestamp: January 05, 2021, 10:21:53 pm
content: I may try to adapt a 15" film to a 14.1" screen, but in this case I would also adapt the plastic frame around the LCD, and make it half inches larger on each cornerThis is the evil plan:Code:.----------------------------| ------------------------ || | | || | | || | LCD 14.1" | || | | || | | || |________________________| ||____________________________|| touchscreen film 15" || LCD plastic FRAME ||____________________________|

author: DC1MC
author_rank: Super Contributor
timestamp: January 06, 2021, 12:22:49 am
content: That's the biggest one, somehow 4:3 I've found for you:https://www.aliexpress.com/item/4000854209066.html260x204mmCheers,DC1MC
Touchscreen : how to choose ? - Page 1
Forum section: electronics / projects

author: Ryl
author_rank: Contributor
timestamp: June 30, 2012, 10:32:00 am
content: Hi guys,I am working on a small touchscreen extension to implement into a robot (show debug, command some basic functions, show points to the robot on a map, etc...).Microcontrollers used are Cortex M3.I am pretty new to the world of touchscreens and I see there are different types and I very don't know how to choose them, and on which criterion. Ordering on Farnell should be great for me, do you have some interesting references for me as well as random tips ?Thanks a lot,Ryl

author: muvideo
author_rank: Frequent Contributor
timestamp: June 30, 2012, 11:31:57 am
content: Hello, if you will use an lcd and touchscreen combo,I've had luck with 2.8" lcd with 37pins, for example ebay #200659767038, I didntbuy from this seller and dont know how are their lcd's, but that kind if interface is easyto find around from multiple sources. Touchscreen interface using the uC itselfit's not hard, but there are also dedicated ic's.The higher end CM3 can drive the interface directly as a memory mappeddevice, for example FSMC of some STM32.Ciao,Fabio.

author: Miles Teg
author_rank: Regular Contributor
timestamp: July 16, 2012, 05:45:51 pm
content: Thank you!!Your link was usefull for me too
Touchscreen overlay - Page 1
Forum section: electronics / projects

author: Rachie5272
author_rank: Regular Contributor
timestamp: January 09, 2015, 10:10:40 pm
content: Does anyone know where to get reasonably priced touchscreen monitor overlays? I'm building a kiosk project, and a 15" or 17" 4:3 touchscreen would be a perfect interface. I already have LCD monitors this size, but I haven't been able to find resistive overlays for anything close to a reasonable price. Smaller ones are very cheap, making me think they do exist.Any ideas?

author: Psi
author_rank: Super Contributor
timestamp: January 09, 2015, 11:07:14 pm
content: Does it have to be resistive and what price do you consider cheap/expensive?This one is optical and $55http://www.aliexpress.com/item/17-Inch-Infrared-Touch-Screen-Overlay-IR-Touch-Screen-Frame-IR-Touch-Kit/2014365031.html

author: Rachie5272
author_rank: Regular Contributor
timestamp: January 09, 2015, 11:18:22 pm
content: I suppose infrared would be fine too. I'm not very fond of capacitive though; they never work well for me.That one is $95, because of an outrageous $40 shipping charge. About $50 total seems reasonable to me.

author: Psi
author_rank: Super Contributor
timestamp: January 09, 2015, 11:32:50 pm
content: I have no idea on the build quality of these, i'm just searching aliexpress.But the following all seem to be around your price point.15"http://www.aliexpress.com/item/Free-shipping-15-Inch-4-Wire-LCD-Resistive-Touch-Screen-Panel-USB-Controller-Especially-for-Digitizer/1281940365.html17"http://www.aliexpress.com/store/product/4-3-17-Inch-includes-USB-Controller-4-Wire-Resistive-Touch-Screen-Panel-For-photobooth-photo/1248879_1957348351.htmlhttp://www.aliexpress.com/store/product/4-3-Foldable-and-Flexible-17-Inch-includes-USB-Controller-4-Wire-Resistive-Touch-Screen-Panel/1248879_1957305532.html
Toy Xylophone - Page 1
Forum section: electronics / projects

author: DaveAvr
author_rank: Newbie
timestamp: May 17, 2012, 03:29:35 pm
content: Just wanted to show off this little project. It's been a big hit with my friends.http://youtu.be/Ypsrc0Gcf2wIt was programmed with Bascom, a very good basic compiler. (no I don't work for MCS in any way just a fan)Dave

author: Unknown
author_rank: Unknown
timestamp: May 17, 2012, 05:43:33 pm
content: Very good indeed.Now you have to get in front of the camera and explain how its done.