Thermistor electronic thermometer circuit diagram

Published:2012/8/16 22:17:00 Author:Ecco | Keyword: Thermistor, electronic thermometer | From:SeekIC

The thermistor RT and R1 , R2, R3 and RP1 form a temperature measurement bridge. When temperature is at 20 ℃, using R1, R3 and adjusting RP1 can allow bridge to keep balance. When temperature rises, the resistance of the thermistor RT reduces, the bridge in an unbalanced state, the imbalanced voltage output by bridge is amplified by operational amplifier, then the amplified imbalanced voltage causes corresponding deflection of microammeter connected to the op amp feedback circuit. The resistance of the thermistor is between 500 ~ 5000Ω.



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