Motorcycle headlight monitor (CB9117E)

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

Signal Generator (CB24108E)
This small signal injector generator was found in the February 1971 issue of Radio Electronics magazine....
15 W Amplifier (CB16380E)
This amplifier, found in a 1981 publication, provides 15 W lHF power with a supply voltage of 14.4...
Photoelectric alarm (CB23798E)
This simple passage alarm is powered by the power grid using an LDR as a sensor. The circuit is...