This circuit is intended to recover a very weak signal at a receiver, for example, a CW signal or a tone signal. The circuit is from a Popular Electronics from the 90s.
This circuit is suitable for testing motor starting capacitors. Capacitors from 2 to 8 uF are...
This traditional crystal radio circuit, but which has a modern version with diode, was found in an...
This filter rejects signals below 300 Hz and signals above 3000 Hz, being used in...