The auto-control circuit of 555 ventilators

Published:2011/5/27 20:46:00 Author:Borg | Keyword: auto-control circuit, 555 ventilators | From:SeekIC

See as Figure 12-30, the control circuit can fulfill the auto on/off of the ventilator, so that the interior air temperature can be improved. The control circuit includes the AC step-down rectifier circuit(), harmful gas sensor, temperature test circuit and dual steady control circuit. The air sensor is made of QM-N5 gas-sensitive elements, and RT is fixed with the MF-51 NTC thermistor. Usually, when the harmful gas or it content is in the permissible range, the resistance between the two terminals A and B of the gas-sensitive sensor is high, and the LEV of B terminal is lower than 1V.



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