The simple temperature control circuit of 555

Published:2011/6/13 21:30:00 Author:Borg | Keyword: temperature control | From:SeekIC

IC2 is an integrated circuit LM567 of frequency decoding, which consists a frequency decoder with RP1, C3 and so on,and its central frequency f0 is set as the central frequency of audio oscillator at the regulated temperature. When the outside temperature is too low, the difference between the vibration frequency and the regulated central frequency (f0) is noticeable, and LM567 doesn't react to the input signal, and its output terminal is in high LEV, the relay(K) is still. When the outside temperature reaches the regulated value, the central temperatures of IC1 and IC2 are the same, and IC2 decode reliably, the output point of LM567 is in a low LEV, K closes to cut off the power of the controlled equipment.



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