the circuit of the double hresholds temperature alertor(3)

Published:2011/6/20 6:34:00 Author:Ariel Wang | Keyword: double hresholds , temperature, alertor | From:SeekIC

IC1 is the integrated circuit of intelligent temperature sensor.It is used for detecting temperature.When the temperature is appropriate(the temperature being detected is within the upper limit value and the lower limit value of the alarm temperature ),pin-6 of IC1 outputs low level.Pin-7 outputs high leve.V1 and V2 are stopped.VL1 and VL2 are not lighted.IC2 and V3 are not working.BL doesn't give a sound.When the detected temperature is lower than the lower limit value，pin-7 outputs low level from high level.V2 is conducted.VL2 is lighted.It indicates the detected temperature is low.At the same time,IC2 is conducted to work.The acoustics signal is amplified by V3.The driver BL gives alam sound.



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