One coil FM tuner (CB9698E)

This circuit with only one tuned coil was found in a 1980s American documentation. The circuit uses components from that time.

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Triangular Generator LM3900 (CB15629E)
To obtain triangular signals, we have the circuit in the figure that uses two amplifiers. One of...
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This circuit was found in an old Electronic Design. It makes use of sidacs and operational not very...
Audible Voltmeter (CB21395E)
This circuit was found in an American publication from 1969. Transistors are from the time and can be...