Solid state relay (CB8518E)

This circuit was found in a 90s Popular Electronics. Both the coupler and the MOSFET can be of any type.

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...