Well, I have a little problem, I'm out of resources for the next month (read: funds for electronics) and I ordered a 12V accumulator/lead battery. The motors I have are rated for 7.4 Volts and are 165W. Full spec's are not available (cannot find them) but I do have a link to the motor.
Here is a quote from the seller page:
Supply Voltage 7,2 - 7,4 V Nominal Voltage 7,2 - 7,4 V Turns 12 RPM (no load) 32000 min^-1 Power 165 W Manufacturer number 2310072 Use as Tuning-part
Now, I have a motor schield which is 0.018 Ohms and I assume the DC motor has something around just that. I do not have such small resistances to drop the voltage from 12V to 7.4, so what are my options?
Is there any DIY voltage regulator thingy?
The resources I do have are (from the arduino starter kit):
5 x Resistor 220 ohm 5 x Resistor 1K ohm 5 x Resistor 2K2 ohm 5 x Resistor 10K ohm 5 x Resistor 330K ohm 2 x 100 nF Capacitor 2 x 10 nF Capacitor 2 x 100 uF Capacitor 6 x LED 1 x Piezo speaker 1 x 10 KOhm POT 2 x PCB button 1 x LDR 1 x Thermistor 1 x IR Receiver 2 x Transistor 2 x Diode 1 x MOSFET
and some other scrap which is lying around (broken DVD players etc).
Any thoughts on dropping the voltage to 7.4V without losing too much power?
I did look at 30A voltage regulators but some are even in the price as high as $500, but I can't find any 12 to 7 volts 30A regulators, so I think I'm on my own with this?
Anyway, I hope someone here can guide me in the right direction!