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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Proximity Detector (CB11566E)
This circuit is from a 1965 Argentine publication (Radio Chassis Television). The original...
Solar activity detector (CB23584E)
Very rapid brightness changes or flares that occur on the sun can be detected with this circuit that...
High Pass Filter II (CB19679E)
The components of this filter are calculated using conventional formulas (see mathematics section of...