Symmetrical Inverter (CB6647E)

This circuit reverses the signal if both positive and negative. We found it in an American documentation from 1969.

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Touch Switch (CB6451E)
We found this touch control on a Popular Electronics from 1970. The circuit makes use of an...
1 Hz Active Filter (CB6721E)
This very low frequency circuit was found in a 1964 Electronic Design. Transistors may be modern...
Wien Bridge Oscillator using the LM324 (CB4002E)
This circuit, from the 1990 Motorola Dataar Databook, can be implemented with other comparators. The...