The gas-fog alarm circuit of dual-way thyristors

Published:2011/6/25 21:45:00 Author:qqtang | Keyword: gas-fog alarm, dual-way thyristors | From:SeekIC

The gas-fog alarm circuit of dual-way thyristors When there is the combustible, the conductance of the TGS308 gas sensor is increasing, and it picks out the voltage with the help of potentiometer RP1, the value of the voltage is from 3V to 20V. The raised voltage is then added on transistor VT1 by the diode and the 4.7kΩ resistor, so VT1 is conducting, which makes the dual thyristor 2N6070A conducting. Because of what described above, the full-wave AC voltage pushes H to generate the sound of 90dB, fulfilling the alarm. H is the 20V AC alarm of Deltal6003168.



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