This circuit was found in an Elektor from the 90s. It is a circuit that generates different types of sound effects. The components are still common today.
This 1.5 A source for FM transmitters was originally intended for the transmitter described in...
This circuit is from the 80's component manual itself, but can be applied to more modern...
We find this circuit in an American 1980s documentation. Integrated circuits are uncommon today as...