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The thermocouple isolated amplifier circuit

2015-01-04 03:02  
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The thermocouple isolated amplifier circuit
Working principles: Q1 is the pre-amplifier tube, which is using the NPN silicon tube, its temperature stability is good. To reduce the noise, the front stage is the key, or the noise will be noticeable after it is amplified at the following stages. The most importance is to avoid the noise being input from the base electrode. In this circuit, the base electrode power supply of Q1 is got after it is stabilized by D1 and D2, which improves the stability further. The resistance of the emitter resistor R4, which has little effect on the stable and still working point, it fulfills the function of AC backward feedback.