The PA222 integrated circuit used in this project from an American 1967 documentation is not common today. The circuit can deliver higher power with lower fidelity.
This circuit uses three oscillators to produce a sound similar to a cricket chirping. Two...
This circuit works in the opposite form to the previous one and drives a relay as a load. The...
This circuit was found in the March 1992 issue of Radio Electronics magazine. The circuit has...