The transistor ionization alarm circuit

Published:2011/6/24 22:09:00 Author:qqtang | Keyword: transistor, ionization alarm | From:SeekIC

It could simplify the transistor circuit of trigger fire alarm and battery low voltage alarm by using continuous fog alarm signal but not the intermittent Beep sound alarm signal. When the impedance in the ionization room is dropping due to the fog or gas, the amplifier transistors VT1~VT3 will offer 100μA basic electrode current to the compound pipe VT4, which makes VT4 conducting and the alarm H generate sound. As the fog or gas content is higher than the regulated threshold value, the voltage limited by RP5 will push the alarm to make sounds.



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