chainclockguy

A couple of additional notes - I would like the controller to be able to drive the motor in either direction (selectable) as well as include a momentary button/input that would run the motor at a much higher speed in order to set the clock.

hi, I need a (what I assume is) fairly simple circuit that can drive a small stepper motor. By small, I mean something like this: http://www.sparkfun.com/products/10551 400mA @ 12V max. This would be placed in a clock, so it would need to use a crystal/oscillator of some sort to keep accurate time. I would need it to rotate the motor at a specific speed(s), something along the lines of 3 Rev/Hour. If this speed could be adjusted in specific increments, that would be great, but a fixed speed would be acceptable. Input voltage would be up to you, but something in the 6~12 vdc range would be ideal. I am currently using geared AC synchronous motors for this application, but it less than ideal since they won't work properly internationally. http://www.chainclocks.com for a practical view.