Phone noise canceler (CB9402E)

This circuit was found in a 1967 American documentation. The circuit uses components of the time, applying to analog lines.

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Linear VCO (CB9429E)
Found in a 90's EDN, this circuit generates signals in the frequency range given by the graph. The...
Controlling triacs with the LM3914 (CB26040E)
The figure shows a circuit that shows how to control an optodiac to trigger a triac from the...
2.5 W amplifier (CB20028E)
This circuit, from an American documentation from 1975, can be assembled with modern transistors such as...