hybridfree/eevblog-posts huggingface dataset:
Gel lead-Acid battery monitor - Page 1
Forum section: electronics / projects

author: jonwilhelmjr
author_rank: Regular Contributor
timestamp: October 08, 2013, 08:48:36 pm
content: Hello, I am looking to build a robot that will use gel lead acid batteries in series providing 24 volts. I need a way to monitor the voltage and current from the batteries accurately with a micro controller so i know when to have the robot charge its batteries. Does any one have suggestions, things to watch out for, or advice how I should go about this project of mine. Thanks you for the help in advance.

author: madsci
author_rank: Regular Contributor
timestamp: October 09, 2013, 06:16:43 am
content: Have you considered AGM batteries? I'm assuming this thing is going to draw significant current. AGM excels here.AGM also has charging requirements like that of a flooded battery whereas gel is a different animal that needs about 500mV lower charge voltage. AGM costs less too.As for the MCU: You can use current shunts to measure current and a voltage divider to take a sample of the battery voltage. These are then fed into A to D inputs on the MCU where your program can manipulate the data. The shunts are just low value resistors (a few mOhms) and like all resistors, they have a voltage drop across them that is proportional to the current through them. This voltage across the shunt resistor can be used to calculate current.

author: AndyC_772
author_rank: Super Contributor
timestamp: October 09, 2013, 06:53:57 am
content: For current measurement, I like the dedicated voltage-output current monitor circuits like the INA271.You could do it with op-amps, but these devices work well with voltages well above their own supply, and you don't need very precisely matched resistors. Feed the output straight to an analogue input pin on your MCU and you're done.

author: madsci
author_rank: Regular Contributor
timestamp: October 09, 2013, 08:00:40 pm
content: Quote from: AndyC_772 on October 09, 2013, 06:53:57 amI like this idea better. It will make your current shunt measurement more accurate.

author: aurelleostean
author_rank: Contributor
timestamp: October 11, 2013, 06:29:25 pm
content: I recommend trying the bq2040 battery monitor, but the design will get complicated, you should check the datasheet for the device where you have an aplication note. This bq2040 design is good if you need information and status of your battery. I got to play with it on a medical device that operates on two 12 volt sealed lead acid batteries in series. Hope it helps, Leo.

author: reagle
author_rank: Unknown
timestamp: October 12, 2013, 03:29:05 am
content: Ti now has an impedance track based chipset for lead acid: bq34Z110http://www.ti.com/lit/ds/slusb55a/slusb55a.pdfPretty cool chip once you set it up

author: ali80
author_rank: Contributor
timestamp: October 12, 2013, 05:28:00 pm
content: ina219 from TI would be a nice chip for your application.voltage, current and power sensing with I2C communication protocol
Genarate two clocks 180 degrees phase difference - Page 1
Forum section: electronics / projects

author: AcHmed99
author_rank: Contributor
timestamp: July 01, 2012, 02:46:53 pm
content: I

author: Strada916
author_rank: Frequent Contributor
timestamp: July 01, 2012, 03:57:19 pm
content: http://www.dprg.org/tutorials/2005-11a/index.htmlthen add a not gate ie transitor off the output to get your 180 shift.

author: nctnico
author_rank: Super Contributor
timestamp: July 01, 2012, 05:27:49 pm
content: An ARM uC would have no problems with this. I recently designed a software controlled high power function generator around an ARM controller which runs 2 forward converters and a class-D output stage from software.

author: westfw
author_rank: Super Contributor
timestamp: July 02, 2012, 04:31:46 am
content: A lot of the newer microcontrollers (regardless of cpu architecture) now come with fancy timer modules that will generate multi-phase PWM outputs with programmable dead-time between the outputs (all designed for motor control and/or smps mosfet driving and all those other "smart power" applications that are around.For example, Microchip has their "Complementary Waveform Generator" in parts as small as their 6-pin PIC10F32x chips. "The Complementary Waveform Generator (CWG) produces a complementary waveform with dead-band delay from a selection of input sources."

author: hlavac
author_rank: Frequent Contributor
timestamp: July 02, 2012, 07:19:49 am
content: What I would do is use two timer/PWM modules, set them to the same clock/period but write the actual timer value of one of them to be half way ahead. Then use PWM as usual. Make sure interrupts are disabled and compensate for clock cycles between the two writes to get the timing right.

author: nctnico
author_rank: Super Contributor
timestamp: July 02, 2012, 02:45:34 pm
content: Quote from: AcHmed99 on July 01, 2012, 11:36:24 pmPIC is about the only uC not supported by GCC. So you can use any microcontroller with GCC which is completely free. You got the question wrong: why did you choose a uC for which there is no free C compiler?

author: hlavac
author_rank: Frequent Contributor
timestamp: July 06, 2012, 10:03:05 pm
content: QuoteThat is exactly why I ended up using microcontrollers from Atmel instead of PICs. Wanted to program in C and was discouraged by the Microchip crippleware... Microchip are you listening?
General ESP32 and CAN based circuit for Escape Rooms - Page 1
Forum section: electronics / projects

author: dayfall
author_rank: Newbie
timestamp: December 31, 2018, 09:58:19 pm
content: Background:One project I had recently was to build a timer for an escape room. It needed a controller for the operators and a display box for the players. It also needed to hookup to the "win condition" relay and to play sounds for either a loss or win condition. Both the controller and display would keep up with the time remaining and would report it to the other device over RS232. That way the operators would know what was on the remote display. Also, this had an added benefit that if either device had a temporary failure, it would re-sync after rebooting.My next project required three devices to be connected to the same communication bus. I decided to go with RS485 this time. I kept much of the same program libraries I had made and basically designed the same devices again.I now have a need to connect many more devices together and I want to have PCBs made to make the whole system more robust. I also need to create a standardized (to me) system so that everything is easier to debug or replace.The Project:A first consideration is which communication protocol to use. RS485 is simple enough, but it is difficult to have multiple masters. Previously I have simply ignored collisions. Status was continuously sent multiple times a second. Not pretty but it worked. RS485 can be added to any micro with a few parts. CAN is also attractive, but it is a bit more difficult to add to smaller micros. My plan therefore is to use both. I plan on having somthing like the "ROBot Independent Network"http://www.bdmicro.com/code/robin/for the RS485 channel. I might add a sense line to detect if another master is using the bus. I will use an ESP32 because it has a built in CAN controller.The other consideration is power. I have been using 12V over a 4 conductor cable, however I feel that a higher voltage is needed. That way I can step down to a regulated 12V or a high current 5V. I figure 19V to 24V is easiest. That allows me to use laptop power supplies and is within the voltage range of my buck converters.I also want a way of connecting the modules that is foolproof. RJ45 seems to be robust enough, cheap, and has enough connectors. I might go with something similar to Power Over Ethernet. Mode B I believe. That is, one pair is positive and another pair is ground. This should make it safe if an Ethernet device was plunged into my network.To start things off, I have designed a PC to CAN/RS485 bridge. I am not an EE nor do I have much experience with PCB design tools. (KiCAD is great so far)One specific question I have, is it ok for me to have the diodes and capacitors driven directly from the TXD and RXD lines. I did that to keep the jack's LEDs on longer. But, do I need another set of buffers or will the micro have no trouble driving both the capacitors and the CAN driver.
General guidance for power traces and thermal control? - Page 1
Forum section: electronics / projects

author: Caterpiggle
author_rank: Newbie
timestamp: July 25, 2020, 06:22:20 am
content: I've been working on a little power supply, which consists of a DC-DC converter to get +/- 12V rails with 1.25A each, and a little linear regulator for +5V out. I've been keeping my traces wide and short where possible, but it seems like I'm just making it up as I go. Any advice or tips on what I have?To dissipate heat, I have thermal planes and vias under both the DC-DC converter and linear regulator which draw heat towards the ground plane. A star ground may be a better solution to keep noise low, but then I would lose thermal performance. Is there any way around this?Thanks!circuit.pdf(48.08 kB - downloaded 110 times.)
General-Purpose SAM4S MCU and Max V CPLD development board - Page 1
Forum section: electronics / projects

author: GarthyD
author_rank: Regular Contributor
timestamp: July 09, 2017, 11:50:04 am
content: So, I've just finished designing and assembling a prototype of a general-purpose SAM4S MCU and Max V CPLD board.The board uses a 100-pin SAM4S MCU (plenty of spare GPIOs and peripherals) and a Max V CPLD. It is USB-powered and controllable, and can charge and use a single-cell rechargeable Li-Po battery. The board has a bunch of extras, including: five RGB LEDs, an IR transmitter and IR receiver, NOR flash, a few sensors, and some buttons.Firstly, a picture of my first assembled protoype board:Hand-soldered. Took a while! :}I've also written a software library and some tools to make it easy to work with. It includes an interface library to communicate with the board over USB.I've written up some pages about my work. Videos included.It can be found here:http://www.entropicsoftware.com/aie/sat/overview.htmlTwenty-second background on me: I'm an experienced software developer, but only a novice when it comes to electronics. The software development side is something that comes easily to me, but I struggle a bit with the electronics side.A few shoutouts:- The final power-on LED design was heavily based on MK14's suggestions in this thread:https://www.eevblog.com/forum/beginners/power-on-led-design-with-mcu-override/.- Sadly I didn't end up including the boost converter I was looking at, but I got some a lot of help here:https://www.eevblog.com/forum/beginners/boost-converter-with-abnormally-high-current-draw/, which I am very grateful for.- The test rig I used when building and testing the board used overvoltage protection based heavily on Ian.M's recommendations here:https://www.eevblog.com/forum/beginners/overvoltage-protection-with-a-twist/. Without this advice I may have inadvertently fried the board and my test setup.Thanks to everyone that helped out.Anyway, I'm weighing up what to do next. If there is enough interest, it might lead to a production run. If you've gone through the pages I've linked above and like what you see, please consider filling out the quick survey that can be found there so I can get an idea as to actual interest. If it's not your kind of thing, that's cool too. Link to the writeup again:http://www.entropicsoftware.com/aie/sat/overview.htmlHappy to discuss the board in any case. I already have a *long* list of changes for the next revision. Any tips, suggestions, input most welcome.

author: GarthyD
author_rank: Regular Contributor
timestamp: July 20, 2017, 07:38:33 am
content: Please also feel free to drop me a message directly if you'd like to give feedback- even if the board isn't your sort of thing.
General transistor switching question for a tube/valve guitar amp - Page 1
Forum section: electronics / projects

author: Planobilly
author_rank: Regular Contributor
timestamp: November 04, 2016, 06:53:33 pm
content: Hi,I need to design a transistor switching circuit to switch two channels on a new amp I am building. Channel one is low gain and channel two is a high gain channel. Output is 100 watts. This switching needs to not add noise or change the tone of the tube channels. The channel switching will be controlled by a foot switch. The amp will be built point to point on a turret board with the transistor requirement being built on a PCB attached to the turret board, at least that is my current thinking.This is sort of new stuff for me.Can anyone give me any general idea of issues I may encounter related to added noise and possible changes in the sound of the amp due the solid state switching?Thanks,Billy

author: Zero999
author_rank: Super Contributor
timestamp: November 04, 2016, 07:02:28 pm
content: If you need to switch power, use a relay.Why not switch the small signal? It can be done with a 2N7000 (if it's under 0.5V peak to peak) or an analogue switch. for higher signal levels.

author: Buriedcode
author_rank: Super Contributor
timestamp: November 04, 2016, 09:50:52 pm
content: Channel switching on the relatively modern amps I've seen either use relays, or photofet's. The bypass/channel switch on many stomp boxes use JFET's along with a discrete bistable flipflop, seems pretty free from noise to me.http://www.geofex.com/Article_Folders/bosstech.pdf

author: calexanian
author_rank: Super Contributor
timestamp: November 07, 2016, 06:26:02 pm
content: Most high end companies use LDR's such as the ones from Vactrol. You can also make your own with photocells and LED's
Generated small amount of electricity from old DVD Drive - Page 1
Forum section: electronics / projects

author: Sandeep
author_rank: Newbie
timestamp: September 02, 2016, 03:02:10 am
content: I did a simple project in You Tube using my old DVD Drive. In this project I made DVD drive as a electricity generated source and was able to light LED's.Watch my project and please give reviews.

author: technotronix
author_rank: Regular Contributor
timestamp: September 02, 2016, 05:23:02 am
content: Great!Is it possible to make something like this for art and design light (LED) at home?

author: SL4P
author_rank: Super Contributor
timestamp: September 02, 2016, 08:14:09 am
content: A nice example of repurposing an easily available DC motor as a small generator - but 80% of the content wasn't "...electricity from old DVD Drive". It was "Dismantling an old DVD drive!"Perhaps the next video could be "How to solder..."<just joking>
Generating DXF and then PCB file from Gerber Data - Page 1
Forum section: electronics / projects

author: keshab.patel
author_rank: Contributor
timestamp: June 03, 2017, 05:26:56 am
content: HI..I have only gerber data for a design in which I need to edit few components.Is it possible to generate dxf from gerber data then import it in pads pcb and change it.

author: jbb
author_rank: Super Contributor
timestamp: June 03, 2017, 06:53:08 am
content: Working with Gerbers is always painful.Not sure about your software package, but I suggest you try to get the Gerber layers into the PCB directly if possible. Going via DXF will add rounding errors which can be painful later.

author: keshab.patel
author_rank: Contributor
timestamp: June 03, 2017, 07:13:24 am
content: Quote from: jbb on June 03, 2017, 06:53:08 amThank you. I am using mentor graphics pads latout. I had to change three components from 0805 to 0603 and change the silkscreen.Sent from my iPhone using Tapatalk

author: wedgetail
author_rank: Contributor
timestamp: October 05, 2017, 05:24:47 am
content: keshab.patelHaving done a lot of searching I came across this topic and the one below. In the link below small amount of help needed to get a successfull conclusion.I notice you are using Mentor layout graphics, in the following topic there was a request for the files from an extremely simple layout:https://www.eevblog.com/forum/eda/seeking-pads-pcb-file-format-specification-to-write-decoder-for-openboardview/msg1107444/#msg1107444Would you be able to make files available?I am one of those people who have a keen interest in using the OpenBoardViewer program when repairing equipment.Added:Just to be a bit more precise about what is needed. Something as simple as the LM3552 example would be small enough to decode/reverse by hand.My understanding is that both an .ASC and .PCB can be generated. Personally I have only experience with the older Protel until the big Altium took over.
Generating X-rays - Page 1
Forum section: electronics / projects

author: SpectrHz
author_rank: Contributor
timestamp: September 25, 2013, 06:08:13 pm
content: I finished my ZVS based X-ray source, and made a video of testing it. It works quite well, and as mikeselectricstuff pointed out in my previous post, it is not a point source, it turned out to be more of a conical 'spray' if you will. This project was built with the intention of producing x-rays with components I already had or wanted to build. This device fulfills its operating requirements as I do not need a high energy point source at the moment. Eventually I will buy a real x-ray tube and test it on this setup.
Generation of smooth 5V-Voltage for Measurement - Page 1
Forum section: electronics / projects

author: mechorican
author_rank: Newbie
timestamp: December 19, 2024, 07:55:38 am
content: Hello everyone,I want to generate a very smooth voltage of 5V for Pt1000 temperature measurements. I have the idea for this,connect two linear regulators one after the other. The first regulator (L7806CV) is supposed to generate 6V from my 24V power supply.The ADM7170 should then generate 5V from this. Is this a good solution in your opinion?Do I have to pay attention to anything?

author: Whales
author_rank: Super Contributor
timestamp: December 19, 2024, 08:03:45 am
content: 1V isn't enough dropout for that 5V regulator to work very well, it might oscillate. The 6V rail might be better quality than the 5V one.How smooth of a voltage rail do you need? Have a look at what ADC you are using in your measurements, find it's ENOB and calculate how many mV each bit is; that will give you a starting point.

author: Smokey
author_rank: Super Contributor
timestamp: December 19, 2024, 08:35:16 am
content: TL431 based voltage source maybe?

author: psydaddy
author_rank: Contributor
timestamp: December 19, 2024, 09:49:52 am
content: Why not using capacitor dividers and a regulator?

author: SCSKITS
author_rank: Regular Contributor
timestamp: December 19, 2024, 04:37:13 pm
content: How many do you meed to drive?How precise do you need to be?

author: TimFox
author_rank: Super Contributor
timestamp: December 19, 2024, 04:57:59 pm
content: Why not use a 7808 or 7810 or 7812 series regulator for the first stage, followed by a TL431 or similar? (7809 seems to be obsolete.)

author: Kleinstein
author_rank: Super Contributor
timestamp: December 19, 2024, 06:53:38 pm
content: Normally a PT1000 should be measured in a ratiometric way. So a resistor to compare to and the same voltage used for the excitation and ADC to measure the resulting voltage. This way there is no need for a really stable voltage and something like TL431, 7805 or so are well good enough.Pt1000 is usually used with something like 0.3 mA of current and thus some 0.3 V. So not sure of 5 V is the right choice (could still be with some 15 K as series resistors in a bridge - though OK for the PT1000, but not ideal for the 15 K).
generic COTS Solar LiPo battery management modules - Page 1
Forum section: electronics / projects

author: julianhigginson
author_rank: Frequent Contributor
timestamp: January 20, 2017, 02:20:43 am
content: Just wondering if anyone has any links for nice premade modules that do Li-Po battery management from a solar panel?I'm hacking up a thing for my yard that I want to have running from solar power, and run for at least a week of no sun... And while I've seen small battery management solutions for specific devices, and large household size ones, I haven't found something to manage, say, a 4 cell LiPo that holds, say, 16Ah. (12V SLA is an option, I guess, but I'm not keen on the idea right now)Normally I'd just design something like this, but as it's not something I expect I would ever make more than 1 of, that seems a waste of time and money, if it's available to just buy. And it seems like the sort of thing that if a basic range of boards was available, plenty of maker types with relatively high powered embedded devices would use to take their projects off mains..... so?
generic multi-amp mosfet switch - Page 1
Forum section: electronics / projects

author: bryce1
author_rank: Regular Contributor
timestamp: September 19, 2014, 12:29:17 pm
content: Hi guys,I switch different dc 12v loads like pumps, fans, heaters and leds with this basic configuration (R7 should be 100k).Do you guys have any suggestions on how to improve it while keeping the complexity of the circuit to a minimum (so that i can understand it)?Regards

author: Phoenix
author_rank: Frequent Contributor
timestamp: September 19, 2014, 01:38:45 pm
content: A few questions for you.What MOSFET are you using, and can you drive it with a high enough Vgs using a logic input, I know they exist but I'm not sure on your current level? If not you will want to consider an additional circuit to pull the gate up to 12V (or some other ratio determined by the resistive divider).Is the freewheel diode rated for the full current? Why did you use a schottky?What's the purpose of R7 and C10? I wouldn't think a 100k resistor there is going to do a whole lot.

author: bryce1
author_rank: Regular Contributor
timestamp: October 03, 2014, 07:32:09 am
content: High Phoenix, thanks for replying.I use different logic level mosfets, so the gate voltage is not an issue. I am thinking however of doing it differently. How would a circuit ideally look like that allowed the use of non-logic level fets?The freewheel diode is rated for the full current. I am not using shottkys anymore.r7 and c10 are supposed to take care of noise that comes from using whatever (as it is supposed to be a generic switch). bad idea?
Generic SMD prototyping boards? - Page 1
Forum section: electronics / projects

author: Things
author_rank: Regular Contributor
timestamp: July 06, 2012, 08:05:30 am
content: Hey guys, picked up a few cool little chips I wanna muck around with, though don't actually have a PCB for them. I can wire them up deadbug style, though I've noticed (and in Dave's vids as well) little SMD prototyping PCB's that have spots of heaps of different packages etc.I've tried eBay but come up with nothing, anyone know where you get these? I could get some made up, but no point of someone already is!Thinking maybe SSOP/MSOP/TQFP etc, nothing insane like BGA.Cheers,Dan

author: kripton2035
author_rank: Super Contributor
timestamp: July 06, 2012, 08:13:00 am
content: here is one :http://www.seeedstudio.com/depot/qfp-surface-mount-protoboard-050mm-p-786.html?cPath=175_188

author: Things
author_rank: Regular Contributor
timestamp: July 06, 2012, 08:20:44 am
content: Ah, thanks, looks good. Thought one of the itead/seeed/adafruit places had them.Dan

author: MikeK
author_rank: Super Contributor
timestamp: July 06, 2012, 09:59:24 pm
content: eBay has plenty of SMD adapters. You must have been swinging the wrong stick.

author: hans
author_rank: Super Contributor
timestamp: July 07, 2012, 09:46:41 am
content: Yeah maybe do a more direct search with the footprint you want, like TQFP, LQFP , SSOP etc.I find the dangerousprototype boards nice but rather expensive. I mean, 10$ for a break-out for 4 chips or something + a prototype area? Well, I etched some boards at college with 30 break-outs for SSOP/SOIC/TQFP (practically free), other than that you may be ordering from iteadstudio a couple of boards in their 5x5cm or 10x10cm (panel)..Ah well, just cent picking here.

author: MikeK
author_rank: Super Contributor
timestamp: July 08, 2012, 04:43:22 am
content: Last week I got 10 SOT23 boards for $7.50 shipped from eBay. And they all look good. China is where everyone is getting their boards made anyway.
Generic Solar Charge Controller identification  - Page 1
Forum section: electronics / projects

author: drummerdimitri
author_rank: Frequent Contributor
timestamp: July 13, 2019, 10:48:01 am
content: I have a cheap solar charge controller that I bought to have some fun with solar power however I am not sure if it is a PWM or MPPT model.Is there an easy way to tell them appart? Is the charging PWM'ed? If so I could not see anything other than DC on my scope.

author: digsys
author_rank: Unknown
timestamp: July 13, 2019, 11:14:08 am
content: Not really, there is a huge variation in design techniques for both. Can you take a pic and maybe write down some of the "important" looking components.ie MPU / controller / FETs? / Inductors / caps

author: radiolistener
author_rank: Super Contributor
timestamp: July 13, 2019, 11:38:59 am
content: if it's cheap, most of all is that this is usual PWM controller.
Generic SPI Screen for Coffee Machine - Page 1
Forum section: electronics / projects

author: Pesle
author_rank: Newbie
timestamp: July 31, 2018, 11:04:03 am
content: Hey, I need some help. Im trying to make a generic SPI screen work on my old coffee machine as it broke and costs alot to replace it and pretty hard to track down in Australia. So far i have gotten very close. The image appears but is split in half (top and bottom row is in the middle). All the information i have on hacking this machine is here:https://github.com/OpHaCo/smart_coffee_machineThis is the screen im using:https://www.adafruit.com/product/250I have tried Inverting the CS signal, but the screen stops working. Not much more I can think of other than maybe delaying the A0 Pin. Is there something else im missing?

author: amyk
author_rank: Super Contributor
timestamp: July 31, 2018, 11:52:22 am
content: That LCD is likely made by this company:https://www.vitek.com.tw/cog-module.htmI suspect the code is expecting an LCD with a slightly different scan direction. If you look at the datasheets some controllers have options to change the scan direction --- this is mainly to ease the COG layout.

author: james_s
author_rank: Super Contributor
timestamp: August 05, 2018, 04:24:46 pm
content: It's actually surprising that it works that well, most of these displays have a bunch of initialization commands that have to be sent before it will do anything at all. It's entirely possible that this display requires a slightly different series of commands. Do you have a logic analyzer or bus pirate or something that can sniff the SPI lines to see what's happening?

author: Pesle
author_rank: Newbie
timestamp: August 05, 2018, 11:06:14 pm
content: Yea, I've got a Siglent 1202x-e. Just gotta figure out how to use decoding on it. Probably wont be that hard

author: james_s
author_rank: Super Contributor
timestamp: August 06, 2018, 01:38:20 am
content: This seems like an excellent opportunity to try it out. Pay particular attention to the initialization at power up.
Genie SilentMax 1000 BWC (protocol?) decoding - Page 1
Forum section: electronics / projects

author: stafil
author_rank: Regular Contributor
timestamp: May 10, 2025, 01:05:25 am
content: Hey, I have Genie SilentMax 1000 Garage Door Opener and trying to decode the wire protocol it speaks with the wall mount buttons. The wall mount has three buttons and two cables going to the main device. I attached the DSLogic to the cables and I got the catpures attached, but I cannot make sense of them. Was wondering if anyone has any idea what they are/mean.First button I pressed was the "Lock" button, which prevents the Garage Opener from listening to open or close requests. I see Line 2 going low, then some high low high low that I can't seem to decode and finally settling at low (Lock Button.png)The I pressed the button again, and after some dance ended up at high.Then the next button was the Light button. I again see some communication but can't make much out of it.Finally it's the Door Open/Close Button, which seem pretty straight forward. Got to low for 250ms, and then go back to high. Followed by some information transitted back by the main device, that I again, cannot decode.Was wondering if anyone has any experience with these garage door openers and their "BWC" protocol or if anyone can do better job than me at decoding it. Thanks!The DSLogic software is here, in case anyone wants to have a better look:https://www.dreamsourcelab.com/software/DSView_v1.3.2_x64_setup.exe

author: stafil
author_rank: Regular Contributor
timestamp: May 10, 2025, 02:14:38 am
content: Nevermind, it's junk data. It's not digital, it's analog. Default is 3.3V. Light button activation takes it down to 1.6V. Sure-Lock button takes it down to 0.6V and keeps it there. Open/Close button takes it down to 0 volt.
Ignore this - duplicate-  - Page 1
Forum section: electronics / projects

author: sdancer75
author_rank: Frequent Contributor
timestamp: May 07, 2023, 01:32:36 pm
content: ignore this duplicate

author: inse
author_rank: Super Contributor
timestamp: May 08, 2023, 04:12:18 am
content: I…can‘t

author: Gyro
author_rank: Super Contributor
timestamp: May 08, 2023, 08:23:57 am
content: Quote from: sdancer75 on May 07, 2023, 01:32:36 pm@OP: The correct procedure is to click on 'Report to moderator' on the right hand side of the screen and ask for the thread to be deleted.
Genius G540 universal programmer and SAMSUNG K9GAG08U0E Flash - Page 1
Forum section: electronics / projects

author: sdancer75
author_rank: Frequent Contributor
timestamp: May 07, 2023, 01:30:25 pm
content: I know that this programmer is pretty old, but I was wondering...1) Can this G540 universal programmer program a NAND Flash Memory like SAMSUNG K9GAG08U0E? There is not listed in the current device list. So, can I use a trick or something to program this IC?2) Is there any way to use this programmer with other software -maybe from another programmer- that that is up-to-date?Why is this programmer abandoned by its mother company?Regards,

author: coromonadalix
author_rank: Super Contributor
timestamp: May 07, 2023, 10:30:00 pm
content: Anything as an end thats the way it goes, if not listed you know your answerUnless you have reverse engineer skills to add your part(s) ... you need to switch programmerI'm not aware if Genius brand in an oem of another .... dismantle your unit and chek pcb markings ...

author: barshatriplee
author_rank: Regular Contributor
timestamp: May 08, 2023, 05:54:36 am
content: Switching to another Universal programmer looks like the only option to me.

author: sdancer75
author_rank: Frequent Contributor
timestamp: May 08, 2023, 06:16:32 am
content: Quote from: coromonadalix on May 07, 2023, 10:30:00 pmHi,Thank you for your answer. I read somewhere that this programmer is a GQ-4x cloner but GQ USB Programmer 7.31 software does not seem to recognize this as valid hardware.Take a look from the PCB inside (taken from another website)PS : The main controller is intelEPM3032ATC44-10N and USB MCUC8051F340-GQhttps://gr.mouser.com/ProductDetail/Intel-Altera/EPM3032ATC44-10N?qs=jblrfmjbeiGqxKMsimDEnQ%3D%3Dhttps://www.silabs.com/mcu/8-bit-microcontrollers/c8051f32x-f34x/device.C8051F340-GQ?tab=specs
Genuine vs. Generic Hirose connectors - Page 1
Forum section: electronics / projects

author: jonathanzufi
author_rank: Newbie
timestamp: August 05, 2016, 04:15:30 pm
content: Hi EEVBloggers.I have a question about Hirose connectors, specifically DF57H-2S-1.2C.See the attached image below. We received some custom batteries from a supplier in HK - when we went to plug the battery into our board, we noticed the fit was a little more snug that what we were used to. Upon closer inspection (and as you can see in the image) it turns out that the connectors are not the exact ones we specified. When we asked our supplier they told use they used a 'generic' substitute.Does anyone have any experience or background on this topic? The thing is that the connectors actually fit fine, they are just a little more 'snug' and we're not sure if we should be worried about any long term effects.Thanks in advance,Jonathan.

author: johansen
author_rank: Super Contributor
timestamp: August 05, 2016, 05:19:28 pm
content: you may want to take the electrical bits out and measure the insertion force of the connector itself, not the plastic housing.
Gerber files for INAEVM-SO8 from TI ?  - Page 1
Forum section: electronics / projects

author: Overspeed
author_rank: Frequent Contributor
timestamp: November 10, 2024, 08:13:59 pm
content: HelloI need the gerber files for INAEVM-SO8 which is a universal op amp testing boardI don't succeed to locate them , does someone have them or something similarRegardsOS
germainium transistors - Page 1
Forum section: electronics / projects

author: m3vuv
author_rank: Super Contributor
timestamp: January 04, 2022, 03:13:44 pm
content: Just a random question,not sure where to post so here goes!,i just wondered if anyone makes smd ge transistors,or if they are infact still made?

author: Terry Bites
author_rank: Super Contributor
timestamp: January 04, 2022, 03:26:49 pm
content: No mate.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: January 04, 2022, 03:28:12 pm
content: They make silicon-germanium RF transistors, but I don't think that's what you meant. AFAIK, the kind of 1960s germanium transistors you appear to be looking for are no longer made.

author: mawyatt
author_rank: Super Contributor
timestamp: January 04, 2022, 03:36:01 pm
content: There are some SiGe BiCMOS processes for ASIC use, and a few discrete SiGe bipolar transistors but don't know of any pure Ge only devices. Ge was also used in Silicon Strained Lattice CMOS to improve the MOS device speed by means of increasing the carrier mean free path.Best,Edit: BTW if the interest is in a saturated switch, then a MOS device is usually better, or if a bipolar is absolutely necessary then an "inverted" transistor works well. "Inverted" meaning exchanging the emitter and collector, this produces a very low saturation voltage because of the doping profile of the E-B vs. C-B junctions.

author: Kleinstein
author_rank: Super Contributor
timestamp: January 04, 2022, 03:52:58 pm
content: Germanium transistors are rather sensitive to high temperature - so SMD soldering may not be such a good idea. There is also very little need for Ge-transistors anymore. So not sure if there are any new one available at all.The were a few RF types available in a SMD usable case, e.g.https://www.radiomuseum.org/tubes/tube_af379.htmlThis would still be a reasonable fast PNP.
German datasheet notation? - Page 1
Forum section: electronics / projects

author: rea5245
author_rank: Frequent Contributor
timestamp: August 05, 2021, 02:11:53 pm
content: Hi. A quick question for German speakers. I have a German datasheet for a Nixie tube. There's a notation on two of the pins that says "ic".I assume that means "no connection". But what are the German words it's abbreviating?Thanks.

author: Qw3rtzuiop
author_rank: Frequent Contributor
timestamp: August 05, 2021, 02:49:32 pm
content: Apparently it is an english abbreviation. The answer is here:https://electronics.stackexchange.com/questions/52885/nixie-tube-ic-pin-what-is-itIn german datasheets the abbreviation is iV.

author: TimFox
author_rank: Super Contributor
timestamp: August 05, 2021, 03:41:27 pm
content: The English abbreviation "IC" for "internal connection-do not use" (per RCA tube manuals) is very common on vacuum-tube data sheets.The pin through the "button" base is a convenient place to support one of the internal bits of the tube, and that pin on the socket should not be used as a connection lug.Unused pins where the socket pin may be used are abbreviated "NC-no connection".What is the literal meaning of the abbreviation "iV" in German?

author: rea5245
author_rank: Frequent Contributor
timestamp: August 05, 2021, 06:41:33 pm
content: Thank you, Qw3rt and Tim.

author: Qw3rtzuiop
author_rank: Frequent Contributor
timestamp: August 05, 2021, 07:03:05 pm
content: Quote from: TimFox on August 05, 2021, 03:41:27 pminterne Verbindung -> internal connection

author: Terry Bites
author_rank: Super Contributor
timestamp: August 07, 2021, 05:09:39 pm
content: I love German datasheets. The senisbly refer to voltage with a U not a V.I like thef mittelschrift used in the old ones too.Ahh, the smell of burning dust and hot bakelite... Hummmm. Hilversummmmm.

author: TimFox
author_rank: Super Contributor
timestamp: August 07, 2021, 05:55:52 pm
content: Also, they know how to spell their own language, even if they use "U" instead ofV.
German electrical engineer confused with the Arc Flash theory !!  - Page 1
Forum section: electronics / projects

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: November 02, 2011, 01:39:16 am
content: It looks that I am not the only one who has hard times to understand what the Americans have at the back of their heads about several subjects like this.http://engineering.electrical-equipment.org/forum/general-discussion/arc-flash-are-nfpa-70e-and-ieee1584-dangerousBut by watching one German electrical engineer to pool his hair about it , I feel sympathy for him.At the end he is one of us.

author: Mechatrommer
author_rank: Super Contributor
timestamp: November 02, 2011, 05:16:45 am
content: so whats the point? he's not confused with "arc flash theory", but he questioned the regulation and standard implemented.

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: November 02, 2011, 01:18:53 pm
content: The point is that by making regulation and standards, and mailing them in the other side of the planet, it does not work out !!For such subjects should be responsible only one, and international committee .

author: PetrosA
author_rank: Frequent Contributor
timestamp: November 02, 2011, 11:48:10 pm
content: Quote from: Kiriakos-GR on November 02, 2011, 01:18:53 pmNo, I think we should have a referendum
Get a LCD display for serial port? - Page 1
Forum section: electronics / projects

author: sam1275
author_rank: Frequent Contributor
timestamp: April 27, 2015, 09:52:40 am
content: Hi everyone.The question is about this board:http://www.8devices.com/wiki/carambola:2:specificationsThe customer support say the serial/console port runs on the usb port.I want to connect a little LCD to the serial port, and just display what the out put is, is that possible and how can I do that?Thanks!
Getting 50Hz out of a 32.768KHz xtal - Page 1
Forum section: electronics / projects

author: MrSlack
author_rank: Frequent Contributor
timestamp: May 06, 2016, 10:22:42 am
content: I've got stack of 4060, 4040, 4017, 4013 and a pile of bog standard gates. I am trying to generate a 50Hz timebase signal with 10ms high and low times (sample+display periods). I only have a 32.768KHz xtal on hand unfortunately.The base frequency is a power of 2 and I need a power of 10 output annoyingly by the looks. Neither series intersect anywhere.Does anyone know of a strategy for dividing this down to something I can get to 50Hz from?

author: Alex Nikitin
author_rank: Super Contributor
timestamp: May 06, 2016, 10:37:34 am
content: How accurate the "50Hz" signal needs to be? If you divide 32768 by 655 you'll get ~50.0275, with only +0.055% error. Would that be good enough? If not, you'll have to use a PLL (say, x25 from 2Hz clock).CheersAlex

author: MrSlack
author_rank: Frequent Contributor
timestamp: May 06, 2016, 10:48:06 am
content: 0.00001% would be nice as this is defining a counting period but the xtal is a cheap nasty piece of crap so it's probably not even good to that accuracy.I've got a 4046 so PLL is an option. Didn't think of that - thanks655 seems to be as difficult to divide down as well. Results in real numbers/primes up to 20

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: May 06, 2016, 10:48:24 am
content: 8-pin PIC (e.g. 12F508) with the 32K xtal as the main clock source.

author: MrSlack
author_rank: Frequent Contributor
timestamp: May 06, 2016, 10:56:18 am
content: I haven't got any PICs or a programmer.By a stroke of luck I just found a 3.2768MHz xtal I missed in my cupboard so I'll shove it through a 4060 to get 200Hz then a 4013 to /2 twice and 50Hz. Problem solved.Thanks for everyone's assistance anyway.

author: Alex Nikitin
author_rank: Super Contributor
timestamp: May 06, 2016, 11:03:20 am
content: Quote from: MrSlack on May 06, 2016, 10:48:06 amIf you need that kind of precision the simplest would be to find a better crystal, say 1Mhz. A PLL (or a PIC, for that matter, as it would use an internal PLL) would produce considerably more LF phase noise than a directly divided crystal oscillator.CheersAlexP.S. - I see that I'm late with my suggestion.

author: MrSlack
author_rank: Frequent Contributor
timestamp: May 06, 2016, 11:19:38 am
content: Indeed, a good suggestion and that's where I ended upI'm just being impatient really. I ordered some bits from RS which aren't arriving until Monday so I thought I'd rig up a signal source so I can do this over the weekend. I don't like being blocked by parts availability.Edit: Phase noise would kill this as well as it is using the low on the oscillator output to ate a counter.
getting a digital display driver for a precision function generator - Page 1
Forum section: electronics / projects

author: samfisher92
author_rank: Contributor
timestamp: November 30, 2014, 04:13:48 pm
content: Just another project that i wanna build that can generate sine wave, square wave, triangle wave, etc.i got a few ideas to build the analog part of the project but i am a little stuck in working out the digital part of the project which is the digital display of the function generator.like what are the ways to display the information of the generated waveform on a LCD/7-seg LED screen?keeping the question open-ended for a good discussion here
Getting data from old LCD to another microcontroller - Page 1
Forum section: electronics / projects

author: Red_Micro
author_rank: Regular Contributor
timestamp: September 01, 2021, 11:41:24 pm
content: First of all, the LCD works fine (see pictures attached). It has 8 bits of data and some controls pins like read/write/chip select and it's connected to a quasi-bidirectional I/O port from a microcontroller. The LCD shows some menus, current readings and time. I need that data somewhere else in another microcontroller, so my idea is to connect an I/O expander like PCF8574 to the same quasi-bidirectional port (basically in parallel) and read the data that is being shown on the LCD via I2C. The challenge could be to interpret the data in the second microcontroller the same way the LCD driver interprets it. Is this an acceptable idea? Other suggestions are welcome.

author: amyk
author_rank: Super Contributor
timestamp: September 01, 2021, 11:53:00 pm
content: That's not an LCD, it's a VFD. Protocol is likely custom as the controller is an 8042.

author: james_s
author_rank: Super Contributor
timestamp: September 01, 2021, 11:53:17 pm
content: That's a VFD, not an LCD.It's certainly possible to do, the first thing you have to do is either find a datahsheet or analyze the protocol and make a list of commands you need to decode. You also need to take into account the bus speed, an IO expander may or may not be fast enough. If that turns out to be the case, you could use a microcontroller with more pins, or this would be a good application for a CPLD to latch the data and shift it out to the micro.Some of those VFD modules are compatible with the industry standard HD44780 LCD controller, in which case most of the work is already done for you, there probably already exist decoders for that.

author: coromonadalix
author_rank: Super Contributor
timestamp: September 02, 2021, 02:19:40 am
content: or ditch the 80c42 mcu and interface directly the hv5812 vfd drivers

author: sleemanj
author_rank: Super Contributor
timestamp: September 02, 2021, 03:50:35 am
content: This is the company that made the displayhttps://ieeinc.com/you might be able to get documentation on the protocol from them.

author: spostma
author_rank: Regular Contributor
timestamp: September 14, 2021, 07:22:30 pm
content: I have done a similar job to read out displays using a couple of CD74HC40105M FIFO registers to buffer all data written to the displays because it was written faster than I could poll it with my microcontroller.This worked very well!Digikey has the CD74HC40105M in stock.
Getting ESD discharges onto a connector to chassis - Page 1
Forum section: electronics / projects

author: Northy
author_rank: Regular Contributor
timestamp: March 04, 2021, 08:45:50 pm
content: Hi all,This has come from another question I've been asking about GND and Mid-Plate GND pins on a USB Type C connector.If I'm putting something in a metal box in the past I've always connected the 'chassis' of the connector to a Chassis GND pour (via stitched on multiple layers) around the edge of the PCB and tied this back to Mains Earth. The thinking being to get any ESD events back to Earth Ground as fast as possible, to try and persuade it from not going onto the main circuit.Now the USB Type C connector has a shield and GND pins, but the spec says these are all tied together in the connector plug, so my usual way of doing things won't be as effective.I know these things are not black and white, and I'm more than willing to test what is needed at a test house, but what 'things' would it be sensible to add pads for on the PCB to connect GND to Chassis near the connector (to again try and persuade the ESD event to go to the chassis) and would that be a suitable strategy to try and control the path of the ESD strike?I do have audio circuitry on the board so I'm reluctant to simply tie all the GNDs together, it seems far more normal (and actually required for good performance) to connect Chassis GND to the PSU GND (0V) only at one point right near the PSU connector.Thanks,G
Getting Power to a Speaker - Page 1
Forum section: electronics / projects

author: skrph
author_rank: Newbie
timestamp: December 02, 2021, 04:27:08 am
content: Hello everyone! First post on the forum here, excuse any bad etiquette I may haveMy class's end-of-semester project is to build something involving opamps. I've decided to build a theremin, and I've been plotting it out on ltspice. I used an opamp (U2) to prevent the speaker from pulling any significant current from the frequency generator, but even then, there's only about 0.3 volts going across the speaker. I'm assuming that the speaker has 4 ohms of resistance and 0.2mH, after some brief googling on the average speaker. Attached is the .asc file.How would I get more power going through the speaker so I could actually hear the tone that's being produced?

author: geggi1
author_rank: Frequent Contributor
timestamp: December 02, 2021, 05:09:32 am
content: Add an audio amplifier to the output of your circuit.Something like LM388 would do the job.

author: DavidAlfa
author_rank: Super Contributor
timestamp: December 02, 2021, 06:03:19 am
content: Check the datasheet, the short-circuit current is about 30mA at best...The OP07 is a signal amplifier, can't drive heavy loads, you need a power stage.

author: Steffalompen
author_rank: Contributor
timestamp: December 02, 2021, 06:13:37 am
content: For the sake of me learning from this as well:-Why no capacitive coupling?

author: Dehv
author_rank: Contributor
timestamp: December 04, 2021, 12:29:22 am
content: Use another made for purpose of amp as actual amplifier, or grab a TDA2030 5 pin amp chip

author: EPAIII
author_rank: Super Contributor
timestamp: December 04, 2021, 04:13:09 am
content: Op amps tend to operate around the half way point between the positive and negative supplies (note the dual power supply). This is true of both the input and output sides of the op amps. So, if they are properly biased to operate at that point, capacitive coupling is often just not needed.Tube and discrete transistor audio circuits often need to be biased with a single supply and the DC level of the output of one stage can easily be high enough to drive the following stage into either cutoff or saturation if it is directly coupled to a tube's grid or transistor's base. So, coupling capacitors are often used to allow the output circuit to work at it's desired operating point while the input circuit of the following stage can also operate where it works best - or just plain where it works in the first place.Quote from: Steffalompen on December 02, 2021, 06:13:37 am