The 555 breeze ceiling fan timer circuit

Published:2011/5/28 20:14:00 Author:Borg | Keyword: ceiling fan, timer circuit | From:SeekIC

See as Figure 12-27, the timing circuit consists of step-down rectifier circuit, 555 single steady timing circuit and relay control circuit. Figure 12-27 the breeze ceiling fan timer circuitAfter the fan has started, the voltage on injection pole of VT1 pipe is about 7v, which is the power supply voltage of 555. And when it is starting, since the voltage on C2 can not be changed suddenly, and the diode of D2 is in a reverse bias state, so the 2-pin of 555 is in a low LEV which makes 555 offset, the 3-pin is in a high LEV, J pulls in and J1-1 is getting through, the outlet of CZ gets power and the fan runs.



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