Found in a Popular Electronics from the 90's, this circuit is used to recognize the frequency of a modulated infrared signal. The LM567 circuit must not be supplied with voltages above 9 V.
This is a basic version of the Tesla coil that does not use semiconductor devices, found in an old...
This low noise, low frequency instrumentation circuit was found in a 1976 NASA circuit manual. The...
This circuit already explored in several diagrams in this section was found in a 90’s Popular...