This 4-tube amplifier with 6W of output was found in an American manual from 1947. The sound quality is excellent.
Based on the Linear Technology LTC2054, this -48 V circuit was found in a 2005 manual. The circuit is...
This alarm siren circuit has a latch. We found it in an article in the January 1975 Radio...
This circuit was obtained in a Radio Shack documentation from 1977. It can be used as a multimedia...