This circuit makes use of a specific 80's component and was found in an American manual of the time. A matrix keyboard allows you to select one of several music programs.
This 1.5 A circuit has the output voltages adjusted by a selector switch. We found it in a Popular...
We found this circuit in an EDN from the 90s. The circuit is a voltage quadruplicator using...
This is the receiver for the previous circuit, also found in 90s Radio Electronics. The circuit...