I have two of these motors: http://www.radioshack.com/radioshack-super-speed-9-18vdc-hobby-motor/2730256.html#q=motor&start=6&tab=tab1
According to Radioshack's specs (which may be off, not sure), I would need a total of 18v at 4.8 amps, right (I am using an arduino with two of these: http://elcodis.com/parts/6024225/D2394.html#datasheet).
How would I go about this? It is going to be an outdoor project, so I can't use a bench power supply or a desktop PSU. I was hoping to use some sort of laptop charger as they are neatly packaged and I can store it within some sort of plastic if I need to for 'acceptable' weather sealing (it will only be outside when I'm outside, not when it is raining or snowing). Any thoughts?
I am going to be running them at the same time. I don't need an H-Bridge because they are going to be monodirectional. Basically, I will have them turn on, and stay on, in the same direction at the same time. I might make them change speed by using PWM on the arduino, but that is easy (except for the fact that the transistor I have only supplies 100ms max PWM, so I am slightly limited. Thats okay though for this application). I don't mind having it plugged in as well - in fact I would prefer that over a battery. I don't want to have to charge it every time I want to use it. I could run it at 12v (There are plenty of 12v supplies with more then sufficient amperage), but faster is better :P
Any thoughts on where I can get a cheapo 18V 5 amp (sub $10, as that is the remaining budget). Otherwise, I will just go for a 12V and hope it is fast enough.