Found in a 1967 Electronics World, this circuit uses unusual components today. The transformer has a high impedance primary.
The components used in this 80's circuit are not common today. The circuit is very sensitive and must...
This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...
Originally designed for WWV (Standard Time Station) signals, it lets 1 kHz tones pass by rejecting...