On Sun, Apr 22, 2012 at 12:31 PM, wrote: > Tag added ... Thank you, been awhile since I missed that! > This sounds rather like the model railway engines I deal with that run on= AC. > > One armature brush is connected to the AC source. > > The other armature brush is connected to the centre tap of the field wind= ing > > The two ends of the field winding are connected, one at a time to the oth= er side of the AC source, depending on which direction you want the motor t= o run. > > I believe this is also the basis of the so-called "universal motor" that = has been used in power tools for a long time, and will run on AC or DC. Interesting. Mine has two green wires, a yellow, and a white. The two greens enter the PCB next to each other and connect to the same trace (ie they're shorted together). The white and yellow are separate. I can make the motor spin by connecting one leg of AC to the green wires, then to either the white or the yellow. The white and yellow wire seem to have a 44uF cap across them. There's also a higher power resistor around there, but I'm having a bit of trouble figuring out where it goes. Suppose I tried feeding power to green(s) and yellow. Would I potentially cause any damage if I shorted white to green or white to yellow? Thanks! Josh --=20 A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. =A0 =A0 =A0 =A0 -Douglas Adams --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .