I have a brushless motor powering a water pump for a PC. It starts up @12 volts, but not 7. How can I lower the voltage to around 8 (BTW, I have ground, +5, and +12 available)? I tried 5 Ohms of resistance, but it still wouldn't start. Would a capacitor after the resistor help anything? I'm guessing the motors resistance is not constant due to the switching in a brushless motor. So would a capacitor make the input voltage more stable?
I know all about PWM circuits, but I'm looking for something simple. PWM is either expensive and bulky (around $30), or cheap (IC), but you need to purchase 100 of them.