The integrated circuit used in this circuit from a 1987 documentation is no longer common today. This circuit can generate a multitude of different sounds and this circuit is an example of application.
We found this circuit in a 2003 documentation. The purpose is to make the player choose one or two...
This circuit allows the frequency generated by an oscillator with the 4069 to be divided by two,...
This commercial transistor radio was manufactured by RCA in the 1960s. The circuit has only 4...