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.
This circuit, which can function as a small transmitter, was found in the July 1978 issue of Radio...
This circuit was found in a Spanish magazine that no more existis, Mundo Electrónico, in a...
Using a transconductance operational amplifier, this circuit was found in July 1983 Radio...