The auto alarm of money box or secret room being pried

Published:2011/7/4 21:47:00 Author:Borg | Keyword: auto alarm, money box | From:SeekIC

See as the figure, the circuit includes the box-door linked switch SB, electric switch, light control sound circuit and audio amplifier circuit, etc. Put the circuit in the closed secret chamber or money box, when it is pried, the circuit will make alarm sound of Ooo```Ooo```



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