Wailing Alarm Siren


Posted on Feb 5, 2014

Here the wailing alarm circuit diagram: Component parts List: R1,R5 4.7KR2 47KR3 10KR4 100KRx *see text C1,C4 100uF/25V, electrolyticC2,C3 0.01uF (10nF),..


Wailing Alarm Siren
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