Sinusoidal Oscillator (CB9189E)

This circuit was found in an Elektor from the 90s. The circuit uses common components even today, requiring a symmetrical power supply.

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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...