BEEPER

Published:2009/7/2 23:24:00 Author:May | From:SeekIC

Intermittent alarm using 555 timer can be set to energize horn, lights, or other signaling device at any desired interval when tripped. When used on auto, sound cannot be mistaken for stuck horn. Choose SCR rating to handle current drawn by relay and timer. If alarm draws less than 200 mA, relay is not needed.-W. Pinner, Alarm! Alarm! Alarm!, 73 Magazine, Feb. 1976,p 138-139.



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