This converter or inverter uses components that are still common. The transformer is the type found in old tube equipment. The power transistors must be mounted on heat radiators.
This CMOS circuit for LED displays is from a Radio Electronics magazine from February 1989. The...
Designed for the audio track, this circuit was found in a Popular Electronics from the 90's. Other...
This power supply for gas laser (HeNe) was found in a 90’s Popular Electronics. It generates from 1300...