Light illuminated control circuit

Posted on Mar 28, 2007

220V AC after capacitive G buck regulator VS regulator, rectifier diode VD, capacitor filter to G IC (NE555) provides approximately 3.3V DC operating voltage. lC Schmitt trigger connected as light control. Night room inside light, the photosensitive resistor

Light illuminated control circuit
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Rc great resistance. The IC and foot potential is lower than Vm / 3 (Vm to 3.3V supply voltage), IC set, pin output high. Light-emitting diodes LED1-LED4 light, due to the LED1 ~ LED4 are fixed at 12 oclock, 3 oclock quartz clock, 6:00, 9:00 at four points, and therefore can play a quartz clock to the role luminous lighting. Natural light during the day or evening before the house lights to go to bed not make RG resistance is small, to the potential of pin and 1C higher than 2V / 3, lC complex position, pin is low, LED1 ~ LED4 in lights state to conserve power.

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