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The circuit of fans with display functions

2016-12-04 10:15  
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The circuit of fans with display functions
The principle circuit is shown in the following figure, it cuts off the X spots of the speed phase lines in turn, and links to the step-down resistors of R1~R3. When the wind speed switch K is on some gear, the conducting current provides the LED digital pipe with power by VD2~VD7, and now the gear number can be displayed. When the gear switch K is shifting, the coil circuit is cut off.