Simple 1-tube receiver (T960E)

This 1V heater tube circuit was found on a Radio Craft from 1945. The circuit is for medium wave and can be used as a tuner.

1 W amplifier with the LM390 (CB13753E)
This circuit is from the National Semiconductor Audio Handbook. The amplifier operates with 6 V...
Wiretapping Amplifier (CB19339E)
This is an amplifier that uses a pickup coil placed next to the telephone set and the listening is done in...
3 to10 MHz Oscillator (CB13020E)
The modified Hartley oscillator seen in the figure can generate signals ranging from 3 MHz to 10...