Path: utzoo!attcan!uunet!lll-winken!lll-lcc!ames!husc6!uwvax!heurikon!lampman@heurikon.UUCP (Ray Lampman)
From: lampman@heurikon.UUCP (Ray Lampman)
Newsgroups: sci.electronics
Subject: Variable speed motor control ... need help.
Message-ID: <288@heurikon.UUCP>
Date: 4 Jan 89 23:01:14 GMT
Sender: lampman@heurikon.UUCP
Reply-To: lampman@heurikon.UUCP (Ray Lampman)
Followup-To: sci.electronics
Organization: Heurikon Corp., Madison WI
Lines: 21

I need a circuit that will provide variable speed control of a DC motor. The
operator control should be via some device with a knob attached. Would this
be a variable resister? The control should be roughly linear, let me explain.

         +               o
         |             /        When the control knob is set half way between
control  |           /          minimum and maximum, the motor should run at a
setting  |         o            rate half way between the rate at the minimum
         |       /              knob setting and the maximum knob setting.
         |     /
         +   o

             +-----------+
               motor rate

I have an appropiate DC power supply for the system. Should I be able to locate
parts for this circuit at a Radio Shack store? Thanks for any help you may give.
-- 
I am seriously considering a career on  | Ray Lampman (608) 276-3431
the beach. I'll need a microwave modem, | Madison Wisconsin USA Earth
solar power supply, and a little shade. | {husc6,rutgers}!uwvax!heurikon!lampman