This circuit is from 1967 General Electric documentation. It uses SUS which are not very common components today. The maximum frequency should not exceed a few kilohertz.
This circuit, suggested by Philips Components (1980), uses a fast voltage comparator and requires...
This circuit warns you if you forget to turn off the car light and leave it. The circuit is from a...
This circuit was found in an ancient American documentation. The transformer is the type used in...