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.

Dynamic Noise Limiter (CB12194E)
The LED is optically coupled to the LDR1 sensor to provide negative feedback to the circuit and...
Simple ohmmeter (CB4152E)
The idea of this circuit is a resistance meter or continuity test with a common microammeter or...
Constant Current Source (CB12175E)
This selectable constant current source was found in an English publication in 1983. The...