Double-bit temperature controller circuit

Published:2011/5/17 9:13:00 Author:TaoXi | Keyword: Double-bit, temperature controller | From:SeekIC

This circuit's temperature measuring bridge is connected to the thermistor, the bridge diagonal is connected to the two-stage amplifier which is composed of the complementary transistor, the output port is connected to the relay coil. The emitter current of the output transistor gets through the 10Ω resistance of the bridge's right branch to form the positive feedback to gain the switching characteristic and the hysteresis. Select the appropriate feedback resistor values (0 to 100Ω), you can get the 0 to 3% wide hysteresis.



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