Microphone balanced amplifier (CB9388E)

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

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Proximity Alarm or Touch Sensor (CB16118E)
This device can be used as a proximity arm, touch sensor or electronic bell. When connected to a...
LM3900 Non-Inverter Amplifier (CB19843E)
This circuit is from the component's own manual, but it applies to others in the same family. The...
Universal power control (CB8709E)
This circuit was found in a 90s Popular Electronics. The circuit uses several relays in order to...