Found in an Electronics World of 1966 this circuit can be made with current power transistors. It causes colored lamps to flash to the rhythm of the audio signal applied to the input.
The presented circuit uses an operational amplifier that is uncommon nowadays, but it can be...
This circuit was obtained in an English magazine from 1978. We can easily assemble it because all...
This configuration similar to many of this site was found in 1965 General Electric documentation. Modern...