Earthquake sound and light alarm circuit

Published:2011/9/14 21:06:00 Author:Rebekka | Keyword: Earthquake , sound and light , alarm | From:SeekIC

The circuit is composed of two integrated circuit chips as the core, and it has few external components, but experiments show the favorable results. It's the circuit is shown as the chart. 555 and R2, C1 form a monostable trigger, usually due to the small copper hammer is floating isolated, the pin 2 of 555 is connected to high potential Vnn by R1, thus making 555 be in a reset state, that is, pin 3 outputs low, then the backward stage does not work without electricity. HFC5212 is the high level trigger, and the quiescent current is very small, the working output current I0 is about 1mA, which can directly drive medium, low power tube.



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