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.
Using a Motorola MC1684 integrated circuit this 1968 amplifier provides 1 W to a 8 ohm load. The...
Equivalent operational amplifiers can be used in this circuit suggested by Motorola in its 1990...
Found in an English publication from 1977 this audio amplifier provides an output of a few...