• Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.


  1. P

    Switching from 6 to 3 apa106 leds - issues

    Hi Everyone! I have reached a point of semi-desperation with a project on which I am working for over a year now. There is one issue I doesn't seem to be able to fix. I have a nixie clock pcb which drives 6 apa106 rgb leds. I am trying to wire it up to be able to turn off three of these leds...
  2. M

    IR LED Powering Circuit - Design Viability Check Needed

    I have been tasked with designing and building a device that will use a .4V Peak to Peak amplitude voltage source to power 5 IR LED's in parallel. I have attached my design schematic, which includes a low pass filter amplifier with a cutoff frequency of 120Hz and a gain of 101 (though the opamp...
  3. D

    Driving 6 White LEDs with 4 AAA Batteries

    I have a project I was messing with that will use 4 AAA batteries (1.5V each so 6V in series). I will have a PIC10F200 that will turn on 6 white LEDs (20mA, Vf ~ 3.2V). I haven't ever used alkaline batteries so wasn't sure what the best way to do this would be. I am a little space limited. The...
  4. H

    sync bass with subwoofer

    Hello, I thing this is the right /r/ to ask this. I have a HTiB and I want to make 2 led strips with ~6 meters blink with bass. I have done some tests with my old subwoofer (logitech z5500) and I noticed that as the bass goes deeper, I got distorsions... I have read that we can use an amp to...
  5. AndrianStoychev

    Sound Reactive LEDs in portable speaker

    Hi guys im really new to electronics I have some very basic knowledge , I am good at making soldering a schematic but almost no idea what does what and why. Im a DIY fan and love doing some small projects (sound related mostly)like a "Car stereo 2.1 home audio system powered by a PC PSU " and my...

Latest threads

EE World Online Articles