I don't understand much about the theory behind a motor.  All I am looking
    for is a typical PWM frequency of a regular R/C 4.5V DC motor.

You want to limit (via the PWM) current through the windings that are making
the motor turn.  I suspect that this means you want you pwm frequency to be
"much higher" than the expected RPM of the motor - otherwise you might end
up doing something weird like pulsing current in only one direction (ie
depending on the position of the brushes...)

BillW

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body