Engine Water Supply Alarm Three

Published:2011/7/29 4:37:00 Author:Felicity | Keyword: Engine Water Supply Alarm | From:SeekIC

Work of the circuit The circuit consists of water level sensor, the transistor V, resistors Rl, R2, water indication light pole tube VL, capacitors Cl, C2, integrated circuit IC and piezoelectric buzzer HA. (It is showed in picture 7-105.) When the water level is higher than the low setting water level, VL is off and HA is noiseless When the water level is lower than the low setting water level, the electrode of water level sensor is above water , then V is saturated and on, the high level voltage output by the emitter pole trigger VL on and also make IC at work ,then HA send out alarm. In case of waving of the water level while driving that cause false alarm, a time delay capacitor C1 is added to the circuit . While the waving water level cause the electrode above the water instantaneously , +12 V voltage will charge C1 through R1. And because the voltage of C1 cann’t change suddenly, V cann’t be on in a sudden and there will be no false alarm.



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