Sinusoidal peak detector (CB21519E)

This circuit for a frequency of 10 kHz was found in an Electronic Design. It makes use of a tunnel diode. The transistor admits equivalent.

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Capacitance Bridge (CB13616E)
With this circuit, from an American documentation from 1976, it is possible to measure...
Model Railroad power supply (CB23728E)
This power supply for model railroad was found in a February 1961 Radio Electronics Magazine. The...
Symmetrical regulator (CB23782E)
This circuit was found in a Radio Electronics from June 1967. The regulator is suitable for power...