Found in American documentation from the 1980s, this circuit has a diode feedback. At the exit we have an indicator LED. The LM3900 is a transconductance operational amplifier.
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...