Silent Alarm (CB6444E)

This circuit simply triggers an LED when the sensor is activated. The circuit is from a Popular Electronics of the 90s.

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Inverter Amplifier (CB14877E)
The gain of this amplifier depends on the component values as well as the operating range and the...
Inverter Oscillator (CB12981E)
The oscillator presented uses two inverter buffers as a base and the frequency, which depends on...
Power Supply 5 to 13 V x 1 A (CB1180E)
This adjustable source was found in a 1979 documentation, but all components are still common...