The auto-control ventilator circuit of 555

Published:2011/6/14 23:27:00 Author:Borg | Keyword: auto-control circuit | From:SeekIC

Figure 12-36 The auto-control circuit of ventilators The gas-sensitive element is fixed with MQ-N sensor, whichforms the gas detection circuit with RP1,R1 and C1; the thermistor of RT, C2 and RP3 form the temperature detection circuit. D1 and D2 form the logic circuit, VT1 is the e-switch, when the harmful gas content or the interior temperature is in the range of regulated values, VT1 is cut off and the 6-lead of the backward IC is in a 2/3VDD LEV, 555 is in a reset state,i.e 3-lead is in a low LEV, SCR is blocked and the motor M is still.



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