1. dkeplar

    Casio Fx-CG20 backlight not working

    Hello everyone, as the title mentioned i own a Casio Fx Cg-20 which i use in my classes and it's backlight is not working. The screen itself is working as i can see it working with enough ambient light. The brightness setting is obviously useless here. Batteries are fresh too. Does anyone have...
  2. kubeek

    Great tool for transformer calculation

    Hi guys, I just found a great website that lets you easily calculate the parameters of a transformer or inductor, given the core parameters and material. I was trying to choose some suitable core to make a flyback for geiger counter, and this really came handy instead of doing a bunch of...