the circuit of alarm for temperature detecting

Published:2011/6/17 23:13:00 Author:Ariel Wang | Keyword: alarm, temperature detecting | From:SeekIC

When S1 is at the position of 1 ,the alarm is being as over temperature alarm.When the controlled temperature is lower than the set temperature Q,the electrical contacts of Q are disconnected.IC stops working.BL doesn't give a sound.VL isn't lighted.When the controlled temperature is beyond the set temperature Q,the electrical contacts Q is conducted.IC is triggered to work.The acounstics signal which is output from the OUT end is amplified by V.BI gives alarm sound.VL is lighted.When S1 is at the position of 2 ,the alarm is being as low temperature alarm.When the controlled temperature is higher than the set temperature Q,the electrical contacts of Q are conducted.IC stops working.BL doesn't give a sound.VL is not lighted.



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