This 80's circuit uses a microcontroller programmed to generate various songs. The circuit can serve as the basis for a modern design, for example using Arduino. The old circuit included a small audio amplifier.
This amplifier for automotive use was found in the SGS manual of linear integrated circuits of...
This logarithmic operational amplifier was found in the September 1994 issue of Electronics Now...
This charger for a maximum current of 15 A was obtained from an American 80's schematics. The triac must...