This programmable sound circuit was found in the July 1978 issue of Radio Electronics magazine. It uses an integrated circuit of the time dedicated to producing effects.
The oscillator shown in the figure can generate signals between approximately 3 and 15 MHz,...
This circuit was obtained in a QST magazine from the 90s. The circuit makes use of components that are...
Suggested by General Electric in 1966 documentation, this circuit uses unusual components today....