Roger, That would work to slow the motor down but the short answer is that I did not want to deal with altering the input to the motor. It was such a neat clip on connection to the receiver ... power consumption is probably very low anyway particularly given the fact that the motor is not powered during the possibly significantly long exposure time. It just needs a jolt to open and a jolt to close. Andy On Jun 4, 2013, at 7:22 PM, Eichhorn Roger wrote: > Andy, > > I would think a resistor in the power line would slow the motor and use less current. For a pinhole camera the speed at which the shutter opens and closes can't be important. > > Roger >