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.
Found in a publication from the 50's, this circuit uses a germanium transistor of the time. The...
This battery charger is suggested by National and has a switch that turns it off when the battery is...
The reference voltage for this circuit can be selected digitally. The circuit is from Radio...