Balanced Modulator MC1594 (CB14588E)

This circuit is from the Motorola Linear Databook from 1990. The integrated circuit used is uncommon today.

Tunnel Diode Oscillator (CB14442E)
This is the normal configuration for an oscillator with a tunnel diode. The crystal determines the frequency...
Very simple 2transistor Receiver (CB18316E)
This receiver uses few components, having been found in a Japanese magazine in 1967. The coil has...
600 ohms line Amplifier (CB16795E)
This circuit uses a 741 operational amplifier that must be powered by a symmetrical source of 6 to...