The figure shows a thermostat circuit consisting of a general-purpose I-type F007 op amp. The processing temperature and time requirements of color film are very strict. For example, Shanghai color photo paper requires 20 degrees plus or minus 0.5 degrees, and Kodak-type 2 requires 32.8 degrees. Positive and negative 0.3 degrees. The line temperature control range is 15 degrees to 45 degrees, and the temperature control accuracy is not inferior to plus or minus 0.3 degrees.

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In the figure, RC is a negative temperature coefficient thermistor MF-51.16V voltage is rectified and filtered