High Voltage Regulator (CB14440E)

This circuit was found in the 1972 RCA Power Transistor Databook. Transistors are uncommon today, but the circuit can be assembled with equivalents.

Wattmeter for transmitter (CB11587E)
This circuit is intended to measure the power of a transmitter for the citizen's band (11 meters or...
Micro Metronome (CB11580E)
This metronome can use either a high impedance phone or a crystal phone. You can use a small...
Digital Link Infrared Modulator (CB14683S)
The circuit shown in the figure modulates a low power infrared LED with TTL signals. The circuit can...