It seems the bulletin board picks up a fair number of questions about driving a dc motor for the purpose of controlling speed or position. I've a block diagram of dc motor signal flow if you'd like to place it somewhere on the site. As time goes by, the motor block diagram could be augmented by other block diagrams representing controllers of various types as well as loads to the motor.

Presently it's in MS Word drawing format, but I can easily convert it to *.gif via a scanner. If you'd like to place it on the site, send me an email as to which address where I should send the *.gif file. BTW, I don't have a homepage from which such items could be referenced.

Cheers,

Bruce