Varactor diodes are our varicaps of today. This circuit for switching signals in an RF circuit was found in a Radio Electronics magazine from July 1982.
This circuit was obtained in an English publication from 1978. It generates a ladder that goes up and...
This circuit was obtained in a 1964 magazine, but it can be easily assembled today, as the...
This circuit uses an optocoupler with a phototriac or optotriac to drive an external triac. The...