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motor cct mixed with control cct...what's the effect?

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tcp

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hi,i'm testing a motor driver circuit
( http://home.att.net/~wzmicro/6203drv.html ) with pic 16f84,i have weird output at my pin RA2 connect to "direction",its voltage oscillating around 2-3V which suppose to be either 5V or 0V tested before connected to the motor cct.it's causing my motor to turn clockwise and anticlockwise continuosly....my motor become vibrator,huh?? i use pic development board to connect the motor circuit and another 24V power supply ground to the pic development board....things seem weird....any clues?? :?

thanx for ur attention.....cheers!! :wink:
 
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