This circuit was found in an Electronics World of 1968. It can be applied to any modern triac and the diac can be any type. The load depends on the triac.
This circuit is from a Radio Electronics from April 1965. It uses an incandescent lamp, and the...
Found in American documentation from the 90s, this circuit uses a high voltage relay and has no...
Any small sound amplifier from 200mW to 1W can be used in this simple circuit. Or circuit of two...