[Dhananjay Gadre] happened across a useful little trick the other day. Take any old 1N4148 or 1N914 glass-package signal diode and wire it up right, and you’ve got yourself a nifty little IR detector.

A diode is an electric device which allows the flow of current only in one direction and restricts the current flow in the opposite direction. A diode starts its operations when a voltage signal is ...

Diodes today are solid-state devices, but in the beginning of the electronics age, they were crystals, as it was the German physicist Ferdinand Braun who first discovered in 1874 that crystals had ...