Volume expander amplifier (T364E)

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

9 V x 30 mA Power Supply (CB20202E)
This small power supply is suitable for powering devices using 9V batteries. The circuit uses...
20 V adjustable power supply (CB8167E)
Found in a 90s Silicon Chip documentation, this circuit provides a current of 3 A and the voltages...
Magnetic proximity sensor (CB7920E)
This sensor triggers an oscillator emitting sound when a magnet is approached by a reed switch....