This circuit was used in an alarm published in the July 1970 Radio Electronics magazine. The transistor is a power transistor, and the transformer is 1 A. The power transistor must be equipped with a heat sink.
This circuit was used in an alarm published in the July 1970 Radio Electronics magazine. The transistor is a power transistor, and the transformer is 1 A. The power transistor must be equipped with a heat sink.