Microphone balanced amplifier (CB9388E)

This circuit was found in an old American documentation. The integrated circuit used is uncommon today.

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Operational switching (CB9230E)
Found in Electronics Today International in the 90s, this circuit turns an operational on and off...
Night Switch (CB896E)
At dusk this circuit triggers a relay switching lamps. The circuit can be powered from 6 to 12 V...
Salen Key Low Pass Filter (CB4865E)
This second-order low-pass Salen-Key filter was obtained from an American 1980s documentation. Formulas...