Volume expander amplifier (T364E)

This circuit was found in the 1961 RCA tube manual. The circuit includes a power supply stage.

CK703 Oscillator (CB22505E)
This is the first transistorized circuit published in the Radio Electronics magazine from over...
High Input Voltage 15 V Power Supply LM340 (CB14261E)
The circuit shown in the figure was found in the Linear Applications Handbook by National...
Fire Alarm (CB13153E)
This circuit was found in an American publication from the 70s, but it can be assembled with more...