Ten-Channel Temperature Patrol Detecting Circuit Diagram

Published:2011/6/26 1:03:00 Author:Vicky | Keyword: Ten-Channel Temperature Patrol Detecting | From:SeekIC

Temperature Sensor adopts 3AX31 and is in the form of diode. When the temperature changes, the resistance K presents linear variation. Oscillator is composed of IC1 (555), rce, R1, and C1 etc. The frequency is: f=1.44／(R1+2rce)C1. Therefore, the rce presents linear variation with the changing of temperature, and f also varies proportionally to realize the conversion of temperature and frequency. If ten spots are to be tested, then 10 temperature-frequency converters are needed. In the circuit, IC2 adopts hex inverter CD4069, and F1,F2,F3 make up trigger generator of 0.2 Hz, that is to send a count pulse CP to the count circuit IC3 every 5 seconds.



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