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powering it with 9 V battery
Quotepowering it with 9 V batteryYou could also just wire 9V directly to the motor, and instead of burning it off with a regulator, just set the PWM duty cycle to something lower. If you set the PWM to 128-out-of-255, and have 9V motor power, the motors will see an effective 4.5 volts.
why is 1n4007 diode better than 1n4001?