555 voltage adjustment and timing multi-function electric outlet circuit

Published:2011/5/30 21:21:00 Author:TaoXi | Keyword: 555, voltage adjustment, timing, multi-function, electric outlet | From:SeekIC

As the figure 15-14 shows, the circuit is composed of the step-down rectifying power supply, the steplessly voltage regulating circuit, the natural wind artificial circuit and the timing circuit.etc. The timing circuit is composed of the IC1(555), the MOSFET VT1, RP1 and C3.etc. If you open the power supply switch K1 and press AN, pin-2 has the ground electric potential, IC1's output high electric potential adds to the pin-4 of IC2(555). IC2 is the fan speed controller or natural wind artificial control circuit. After you open the timing switch K2, pin-3 of IC1 still has the high electric potential. Then C3 is charged through the VT1's power supply port, when C3's voltage is higher than pin-6's threshold level 2/3VDD, 555 flips and outputs the low electric potential.



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