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How to build a simple PWM DC Motor Speed Controller using ATmega8 microcontroller, MOSFET and POT

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Here I show how to build a circuit to control the speed of a motor using PWM. PWM is highly efficient in doing this job. It can be used to control very high current motor which much energy loss.
Refer to this video for programming:
https://www.youtube.com/watch?v=jcDS8iaYS_Q
Connections Diagram:
https://drive.google.com/open?id=0B2_DIMlB_m4HRm9QRGI5RkRJTkE
Here's the pwm8.hex file to program ATmega8:
https://drive.google.com/open?id=0B2_DIMlB_m4HcUp2RjNOSXUydHc
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