Low Frequency Doubler MC1556G (CB14564E)

This circuit is from Motorola's 1990 Linear Databook. The circuit employs a component that is no longer common today.

Microphone Preamplifier (CB26214E)
We found this circuit in Radio Electronics Special Projects from 1992. The circuit turns on the...
Null Detector (CB11550E)
We found this circuit in the Texas Instruments' Linear Circuits Applications. It uses an...
RF proximity sensor (CB8765E)
This capacitive sensor that operates with a high frequency oscillator was found in Radio...