Temperature window overrun alarm circuit

Published:2011/5/9 19:17:00 Author:TaoXi | Keyword: Temperature window, overrun alarm | From:SeekIC

Related components PDF download: MAX6502MAX6504HFC5212TDA2822 As the figure shown, this circuit is composed of the high-limit & low-limit temperature detecting circuit, the voice circuit, the audio amplifier circuit and the AC step-down rectifier circuit.etc. The high-limit temperature monitor uses the temperature switch IC MAX6502 to monitor, it can transform the monitored object's temperature into the electric signal, if the signal voltage exceeds the set threshold temperature such as 55 degrees celsius, the monostable trigger will output the shaped pulse to promote the output stage outputs the high-level voltage control signal. This signal adds to the voice circuit IC3's trigger port TG through VD1, to trig the sound.



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