Avalanche Oscillator (CB7112E)

Found in a General Electric documentation from 1970, this circuit consists of a relaxation oscillator that uses a transistor from that time.

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Water Temperature Gauge (CB26172E)
Using a pair of period A/D converters, this 3-digit circuit was found in the 1992 Radio...
15 to 150 MHz Field Strength Meter (CB14798E)
We found this circuit in an American documentation from 1964, but it can be easily assembled...
Stereo FM Transmitter with the BA1404 (CB12595E)
The BA1404 integrated circuit (not very easy to obtain) consists of a complete stereo FM...