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 shield circuit is suggested by Motorola, using a 4N26 type coupler and an MC1733 type...
Twin- T oscillators can be used to produce sinusoidal signals in the audio track with good...
This circuit was found in a 1964 Electronic Design. The circuit makes use of transistors of the...