The gas putting out alarm circuit of auto start

Published:2011/7/4 22:38:00 Author:Borg | Keyword: putting out alarm, auto start | From:SeekIC

The principle circuit is shown in figure 1. The switch S is linked with the gas switch. When the gas valve is open, S is closed, if the gas is not lit, the LDR R2 is in a high LEV, the triode VT1 is conducting, which triggers the music integrated circuit to play music. At the same time, the transformer T1 is stepping up and outputting a pulse voltage with the peak value of 120Vpp, C1 is charged by R5 and C2 is charged by VD1. When C1 gets a certain voltage, the trigger VD2 is conducting, so is SCR, which makes the charged C2 discharges through T2 primary stage and SCR.



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