The electric whistle alarm circuit

Published:2011/6/23 11:07:00 Author:qqtang | Keyword: electric whistle alarm | From:SeekIC

In the figure is the electric whistle alarm circuit that can generate the rising and falling tone sound. The sound is generated by two generators (timer 555 and single knot transistor 2N2648) that are coupled by the photoelectric coupler; The 555 generator produces the 0.3HZ frequency signal, which makes the single knot transistor VT2 sound generator strengthen or weaken in this rhythm.



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