Electronics Forum (Circuits, Projects and Microcontrollers)

Why do they use half the reference voltage 2.048 on the positive terminal of the U4A op amp to provide a 2.048 reference voltage for the negative terminal of the a/d converter?

https://www.electro-tech-online.com/threads/a-d-converter-reference-voltage-on-negative-terminal.166082/

Hello. I’m looking to upgrade my laptop to an OLED display and I’ve seen some ads specifically mention the matte look. Is there two types of coating on these screens and does it affect pe...

https://www.electro-tech-online.com/threads/matte-vs-glossy-screen-is-there-a-difference.165872/

ChatGPT is very very impressive. Anyone that wants to try it go to https://openai.com/ , register and then ask it anything you want. Someone asked about IOT on the forum and I replied with Chat...

https://www.electro-tech-online.com/threads/chatgpt-anyone-use-it.164602/

Hi, I recently acquired my PIC16F1939 for driving LCDs for my watch project. I am hoping to fit it inside a wristwatch but if I can not do that I will just use large static LCDs to make a clock....

https://www.electro-tech-online.com/threads/using-pic16f1939-and-designing-a-circuit-around-it.166083/

I recently purchased a 2009 Seat Leon. I decided to remove the OEM Stereo and try out the Android HU I removed from my previous car. Unfortunately it didn't work. Not only that but when I reconne...

https://www.electro-tech-online.com/threads/seat-leon-stereo-not-working.166066/

Not having too much luck with this pedal I bought as a project. I am able to get power and bypass but no actual signal when its switched ON. I did take it to a shop to have it looked at and had a...

https://www.electro-tech-online.com/threads/help-with-diy-guitar-pedal.166084/

Hi, does anyone know if there is a way to find NFETs for Synchronous Bucks?...How to search them?....As you know, a NFET for a Sync Buck must have Cgd at least 100 times less than Cgs. There is n...

https://www.electro-tech-online.com/threads/searching-for-synchronous-buck-converter-nfets.166023/

Hi All, I made my first STM32 board using STM32G0B1RE, it arrived today, since it's blank I expected the MCU to jump into bootloader and start the DFU, however this did not happen, MCU was not ...

https://www.electro-tech-online.com/threads/help-with-stm32g0.166079/

Hi to all, I haven't been here in a long time, I have a busy life... I have this project in mind... actually it is not in mind anymore, it is near completed; I have a generator that is connect...

https://www.electro-tech-online.com/threads/no-contact-ac-voltage-sensing.166081/

I have these two relays from a company called Baomain. Timer Relay TBT7-B2 (Delay on) Timer Relay TBT7-C2 (Delay off) Id like to know how to configure them. I cannot seem to find a datasheet ...

https://www.electro-tech-online.com/threads/baomain-delay-control-relay-delay-on-delay-off-usage.166078/

I want to attach all 8 tabs to the circuit board as heat sink but can I attach all 8 on together on the circuit board?

https://www.electro-tech-online.com/threads/mosfets-drain-n-type-the-tab-on-to-220-mosfets.165965/

For context, my end goal is to have buttons that, when pressed, tell my controller that I'm touching a certain part of the touchpad. I got an idea from a reddit post about a similar-ish idea. Ign...

https://www.electro-tech-online.com/threads/need-help-with-a-controller-modification.166075/

Dear Everyone I have an anomaly with a spare reference board on my IRD245 dynamic balancer. The board itself was one a was given a replacement for twenty odd years ago and I de-populated it thi...

https://www.electro-tech-online.com/threads/ird245-reference-board-troubles.166080/

I have found videos detailing how to make a good high frequency anti barking device using a frequency generator and a couple tweeters. But what I'd like to do is add a remote control so I can act...

https://www.electro-tech-online.com/threads/sonic-bark-deterrent.166063/

Hello, Im trying to make a UV lamp to cure UV resin, because of the price of other systems I decided to buy my own UV 9W electric bulbs to wire them up. Now the issue Im running into is that no...

https://www.electro-tech-online.com/threads/cant-light-up-uv-lightbulb.166076/

Hi, I'm wondering if someone here could possibly help identify a component. I'm an accordion maker with at best basic knowledge of electronics and sometimes I build microphones in the accordions ...

https://www.electro-tech-online.com/threads/help-identify-a-component-on-a-microphone-circuit.166057/

Hello! im doing a simulation mini project (TEMPERATURE CONTROLLED FAN) using PIC16F877A on Proteus and MPLAB IDE V8 for coding. i need help with my assembly code. i think there is something wrong...

https://www.electro-tech-online.com/threads/temperature-controlled-fan-using-pic16f877a-in-assembly-language.166061/

So my car's cigarette lighter is always powered even when the car is switched off. I am attempting to make it switched so that the power is only on when the key is turned to accessory. I made a b...

https://www.electro-tech-online.com/threads/converting-always-on-cigarette-lighter-to-switched-power.166077/

Hi all, first I am not an electronics guys so sorry if I have any errors in what I am trying to explain. I have a single phase 220v air compressor that has 3 capacitors. Two are start and one is ...

https://www.electro-tech-online.com/threads/testing-a-capacitor-microfarad-rating-that-has-a-resistor.166064/

Hey everyone, I have a very old pillar drill press from 1981 (Draper). It has a green on and red off button on the side. I wondered how I can take power from the drill press when the green/black ...

https://www.electro-tech-online.com/threads/adding-a-ring-light-to-a-1981-draper-tools-pd-16-drilling-machine-1981-mascot-tools-floor-standing-pillar-drill.164908/