need variable DC voltage regulator gizmo

[Michael Eisenstadt]

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

 

[Michael A. Terrell]

Michael Eisenstadt wrote:

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

news:sci.electronics.basics would be a better newsgroup for this.

--
We now return you to our normally scheduled programming.

Take a look at this little cutie! ;-)
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Michael A. Terrell
Central Florida

 

[CWatters]

It might be easier to use a gearbox.


"Michael Eisenstadt" <michaele@ando.pair.com> wrote in message
news:0b6c5b5d4492b73f0f3829c0b93754f6@news.teranews.com...

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

 

[cpemma]

Michael Eisenstadt wrote:

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.

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)
--
Correct address is cpemma at mexbro dot co dot uk