The touch type alarm circuit

Published:2011/7/6 21:56:00 Author:qqtang | Keyword: touch type, alarm circuit | From:SeekIC

Circuit principleThe touch type alarm circuit is shown in the figure, which consists of the power supply circuit, touch delay circuit, SCR switch circuit and negative resistance oscillator, 4 parts in total.The power supply circuit consists of ＶＤ１,ＶＤ２,Ｃ１,Ｃ２ and so on, which provides for the touch delay circuit with a 12V DC working current. The touch delay circuit consists of VT1 and so on, usually, VT1 is in blocked state, SCR VS is disable state without trigger voltage, the next circuit is not working without power.



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