• 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. Grossel

    Dual optical sensor for household printers - default pinout

    Hi. Have scrap saved an old HP printer for parts, and ran into a optical censor (the one that counts position of a printer head). Pinouts as in drawing (black dots not relevant here just two plastic parts through the PCB board). I haven't bothering numbering the pins for the led input, the...
  2. J

    RJ12(?) to 3.5mm

    Hi, real beginner here... I'm looking to convert a 6-pin LAN-style connector (is that 6P6C? RJ12?) to 3.5mm audio jack to connect an amp to speakers etc. I've attached photos so you can see what I'm talking about, but the pin colour from 1-6 is: blue, yellow, green, red, black and white. I have...

Latest threads

EE World Online Articles