Hi i've followed this tutorial http://luckylarry.co.uk/arduino-projects/arduino-control-a-dc-motor-with-potentiometer-and-multiple-power-supplies/
and got it working. now here's the question:
1. If i increase the voltage say 12v 5A do i need to change materials used in the circuit?. the 1k resistor?, the diode? and potentiometer?. because when i tried it with 12v 5A the tip120 quickly becomes hot and suddenly motor stops and after 3-4 secs the motor start again but can't control it anymore with the potentiometer the motor goes on rampage.. i need to turn off the arduino to make it work again.
2. Do i need a higher potentiometer say 50k or change the 1k resistor or the diode?
3. What's better Mosfet IRF510 or Tip120?
thanks in advance