Phono Preamplifier (T1090E)

This magnetic pickup circuit came out in a Radio Craft of September 1946. The circuit can be used with common amplifiers and draw power from them.

Colpitts Oscillator (CB4256E)
The frequency of this oscillator depends on the inductor and capacitors in parallel with it. In...
50kHz Optical FM Transmitter Receiver (CB4949E)
This circuit allows reception and decoding of 50 kHz FM modulated optical signals. The circuit can...
Assisted Ignition (CB6379E)
This circuit was found in Motorola's 1967 documentation. The circuit makes use of power...