This simple three-LED sensor uses an NTC at the input. The circuit is based on an uncommon integrated component today. We found it in documentation from the 80s.
You can adjust the frequency produced by a ring oscillator with three inverters inserting a...
Found in a Popular Electronics from the 90s, this digital recording circuit uses an unusual...
The purpose of this circuit is to increase the sensitivity of a galvanometer, making it possible to...