hello, i have the following motors: **broken link removed** , they are going to be ran off of 5 AA batteries and i need to have a variable speed for them and i went to radio shack and they had a 25 ohm rheostat they said should work, but it only works and varies the speed for about 1/16 of a turn and it is all they have. none of the hobby stores can help me. all i need is a dial to control this, any one know of any
I was thinking i may want to run 4 D cell batteries at 6 volts do you think the run time will be much longerthat way? what is the cost of a pwm for this size application, got a link to one?
MikeMl, 4 amps is the stall current of the motor. At 7.2 V no load current spec says
< 221 ma. Rated load current < 556 ma. if the motor is being slowed I would expect the current to be less than that.
I expect the AA batteries will last quite a bit longer than 5 min. More like 5 hours.