Electric Blanket And Rice Cooker Timer Circuit

Published:2011/7/28 6:55:00 Author:Robert | Keyword: Electric Blanket, Rice Cooker, Timer | From:SeekIC

The picture shows the electric blanket and rice cooker timer circuit. This circuit's timing time could be set from 1 second to more than 10 hours. In the picture, C1 is timing element. When the power supply is connected, pressing the switch AN1, the C1 would be charging to DC 28V. The comparator A would output high voltage level and the transistor VT would be connected, the relay J would be powered up and have actions. The J1-1 would be conncted and the power would be self-locked. The J1-2 would be disconnected. C1 would discharge to the high-resistance input port. When the C1's voltage is decreased and lower than the A's out-phase input port, the A would output low voltage level, the transistor VT would be disconnected, J would lost the power and be released. Then the timing is over until next case that the timing trigger switch AN1 is pressed again.



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