need variable DC voltage regulator gizmo

I'm not sure that sci.electronics.misc is the right SIG for this question. If there is a more appropriate newsgroup I would appreciate your pointer to it.

I have a project where a 12V DC motor and gear box slowly turns a circular disk. I want to have the disk turn as slowly as possible. I discovered that this 12 DC motor/gear box which has a plate RMP of .45 can be slowed down by supplying it with less voltage. In the case of one of the motors, 4.5 V (from 3 flashlight batteries) turns the motor nice and slowly. The other motor requires around 6 V for it to turn. The motors take .3 of an amp at 12 volts according to their specs.

I am looking for DC voltage regulator that I could put in line with batteries so that I could more exactly choose the speed of the motor.

I looked in the Grainger catalogue for something that might do this and just visited a local Radio Shack but I don't know exactly what I am looking for.

Please tell me what is the name of the gizmo I need for this project. And where I might buy one.

Thanks in advance for your advice.

Michael Eisenstadt

Reply to
Michael Eisenstadt
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news:sci.electronics.basics would be a better newsgroup for this.

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Reply to
Michael A. Terrell

It might be easier to use a gearbox.

Reply to
CWatters

A 317T adjustable regulator will allow a range of 1.25v to about 10.5v from a 12v source, simple circuit and everybody sells them. See datasheet for details, use a 120R resistor for R1 (between o/p and adj pins) and 1k pot for R2 (adj pin & ground)

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Correct address is cpemma at mexbro dot co dot uk
Reply to
cpemma

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