Liquid electronic constant temperature box circuit

Published:2011/3/24 2:55:00 Author:Jessie | Keyword: liquid, constant temperature box | From:SeekIC

The thermistor K273 can be used to monitor and adjust liquid's temperature, it is always dipped in liquid. Differential amplifiers constitute bridge circuit, the selecting principle of bridge arm's resistance is that, before through the temperature which adjusted by switch S, thermistors' voltage drop is higher than differential amplifiers shot resistance's voltage drop. So that transistor T1's base is connected, T2 disconnected, relay release. Its closed contact r1 connects the heating element. Once the heating element temperature reaches the setting temperature, Differential amplifiers change, stop heating.



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