This old circuit, from the 80's, uses an integrated circuit that is uncommon today. The circuit is intended for loads controlled by triac and the resistors depend on the desired control.
The transistor on this mixer can be any general-purpose transistor. The number of entries can be...
We found this circuit in a 2003 documentation. The purpose is to make the player choose one or two...
This power step drains just 3.5 mA from the battery and can provide good playback on a 4-ohm...