The figure shows how to implement a filter against interference caused by the switching of a triac. The circuit is from a Radio Electronics from April 1987.
Frequencies up to just over 100 kHz can be obtained with an oscillator based on one of the four...
This circuit, found in a Popular Electronics from 1992, is based on an oscillator and a crystal...
This is a discrete equivalent version of an open collector TTL gate. What we have is an inverter...