The 555 sound warning thermometer circuit of 40℃ limited temperature

Published:2011/5/30 21:13:00 Author:Borg | Keyword: sound warning thermometer, limited temperature | From:SeekIC

Apart from indicating the environment temperature, the thermometer can launch acousto-optical warning signals when it is higher than 40℃ outside. This circuit includes the temperature sensing head, voltage comparator, trigger, stereo circuit and meter indication circuit, etc, see as Figure 12-40. The temperature sensing head is made of the LM35DZ integrated circuit, which can output corresponding DC current in proportion in accordance with the changing temperature outside, the linearity is good, when the temperature changes 1℃, the current changes 10mV, and the precision is 0.5℃ when it is 25℃ outside.



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