Motorcycle headlight monitor (CB9117E)

This simple circuit was found in Popular Electronics from the 1980s. The circuit uses an LED as an indicator.

Amplifier (CB23695E)
The power of this amplifier is 100 mW given by the characteristics of the transistors used. The...
Two transistors power stage (CB22249E)
Found in an American documentation from the 50's, this circuit uses two transistors of the time,...
Windscreen Wiper Interval Timer (CB4963E)
This version is from an old 80's documentation. The SCR can be the TIC106 and the unijunction...