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What rheostat do I need? [message #370074]

Thu, 07 July 2022 08:34

Larry

Messages: 2875
Registered: January 2004
Location: Menomonie, WI

Karma: 10

Senior Member

I want to put a small fan in our GMC bedroom and control speed with a rheostat of some kind. I've looked at several but cannot tell what I need for this particular fan. the fan is a typical "Car Fan" that many have used in the cockpit to circulate air. The fan is a 12v 15CF 6" fan that is a 1.2A fan. Can anyone help me on what I might use. I looked at this one but do not have the knowledge to determine which of the proper resistance I could use.
https://www.amazon.com/RV24YN20S-Potentiometer-Inverter-Regulation-Control/dp/B074KCK7X9/ref=asc_df_B074KCK7X9/?tag=hyprod-20&linkCode=df0&hva did=312361917116&hvpos=&hvnetw=g&hvrand=9253810064696491481&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=& ;hvlocphy=9019332&hvtargid=pla-573213870220&th=1

TIA

Larry

78 Royale w/500 Caddy
Menomonie, WI.

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Re: What rheostat do I need? [message #370075 is a reply to message #370074]

Thu, 07 July 2022 10:00

midlf

Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)

Karma: 1

Senior Member

You do not want a rheostat. That is very old inefficient technology. A Pulse Width Modulator is the current best practice. (Google "pulse width modulator" on wiki for technical and operational information.)

EBay "12V pulse width modulator" to find appropriate devices. For your use most any one will work. There are two basic types you will be interested in. One has the potentiometer mounted on the circuit board, the other has the potentiometer on wire leads so the control can be mounted remotely to the device. Which one you want will be determined on the mounting method.

On eBay you can also search for "12v pwm controller". That should provide the same results.

The "rheostat" listed will not handle the current needed. I haven't done the math but I believe none of those listed would be the correct ohm value.

Please ask more questions if needed. I have 5+ of these installed on mine for various purposes.

Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI

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Re: What rheostat do I need? [message #370076 is a reply to message #370075]

Thu, 07 July 2022 10:22

Larry

Messages: 2875
Registered: January 2004
Location: Menomonie, WI

Karma: 10

Senior Member

midlf wrote on Thu, 07 July 2022 10:00

You do not want a rheostat. That is very old inefficient technology. A Pulse Width Modulator is the current best practice. (Google "pulse width modulator" on wiki for technical and operational information.)

EBay "12V pulse width modulator" to find appropriate devices. For your use most any one will work. There are two basic types you will be interested in. One has the potentiometer mounted on the circuit board, the other has the potentiometer on wire leads so the control can be mounted remotely to the device. Which one you want will be determined on the mounting method.

On eBay you can also search for "12v pwm controller". That should provide the same results.

The "rheostat" listed will not handle the current needed. I haven't done the math but I believe none of those listed would be the correct ohm value.

Please ask more questions if needed. I have 5+ of these installed on mine for various purposes.

Thanks Steve, How about this?
https://www.amazon.com/BOJACK-Controller-Dimmer-Control-Switch/dp/B09P6CMRC9/ref=sr_1_45?gclid=CjwKCAjwiJqWBhBdEiwAtESPaIB_9v-ssgpi_3tx76fHnZVGWA-a8-X SsVYQUD1hig57HMAKLVPlzRoCu6QQAvD_BwE&hvadid=409997657456&hvdev=c&hvlocphy=9019332&hvnetw=g&hvqmt=e&hvrand=6712530865257829960& amp;hvtargid=kwd-320046497276&hydadcr=24630_11410023&keywords=12v+pwm+speed+controller&qid=1657206905&sr=8-45

Larry

78 Royale w/500 Caddy
Menomonie, WI.

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Re: What rheostat do I need? [message #370077 is a reply to message #370076]

Thu, 07 July 2022 12:44

midlf

Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)

Karma: 1

Senior Member

Yes that device will easily operate your fan. The only consideration is the mounting. Some of these are not suitable for a thicker panel.

Larry wrote on Thu, 07 July 2022 10:22

midlf wrote on Thu, 07 July 2022 10:00
You do not want a rheostat. That is very old inefficient technology. A Pulse Width Modulator is the current best practice. (Google "pulse width modulator" on wiki for technical and operational information.)

EBay "12V pulse width modulator" to find appropriate devices. For your use most any one will work. There are two basic types you will be interested in. One has the potentiometer mounted on the circuit board, the other has the potentiometer on wire leads so the control can be mounted remotely to the device. Which one you want will be determined on the mounting method.

On eBay you can also search for "12v pwm controller". That should provide the same results.

The "rheostat" listed will not handle the current needed. I haven't done the math but I believe none of those listed would be the correct ohm value.

Please ask more questions if needed. I have 5+ of these installed on mine for various purposes.

Thanks Steve, How about this?
https://www.amazon.com/BOJACK-Controller-Dimmer-Control-Switch/dp/B09P6CMRC9/ref=sr_1_45?gclid=CjwKCAjwiJqWBhBdEiwAtESPaIB_9v-ssgpi_3tx76fHnZVGWA-a8-X SsVYQUD1hig57HMAKLVPlzRoCu6QQAvD_BwE&hvadid=409997657456&hvdev=c&hvlocphy=9019332&hvnetw=g&hvqmt=e&hvrand=6712530865257829960& amp; amp;hvtargid=kwd-320046497276&hydadcr=24630_11410023&keywords=12v+pwm+speed+controller&qid=1657206905&sr=8-45

Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI

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[GMCnet] Re: What rheostat do I need? [message #370078 is a reply to message #370074]

Thu, 07 July 2022 12:44

midlf

Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)

Karma: 1

Senior Member

Yes that device will easily operate your fan. The only consideration is the mounting. Some of these are not suitable for a thicker panel.

Larry wrote on Thu, 07 July 2022 10:22
> midlf wrote on Thu, 07 July 2022 10:00
>> You do not want a rheostat. That is very old inefficient technology. A Pulse Width Modulator is the current best practice. (Google "pulse
>> width modulator" on wiki for technical and operational information.)
>>
>> EBay "12V pulse width modulator" to find appropriate devices. For your use most any one will work. There are two basic types you will be
>> interested in. One has the potentiometer mounted on the circuit board, the other has the potentiometer on wire leads so the control can be
>> mounted remotely to the device. Which one you want will be determined on the mounting method.
>>
>> On eBay you can also search for "12v pwm controller". That should provide the same results.
>>
>> The "rheostat" listed will not handle the current needed. I haven't done the math but I believe none of those listed would be the correct ohm
>> value.
>>
>> Please ask more questions if needed. I have 5+ of these installed on mine for various purposes.
>
> Thanks Steve, How about this?
>
> https://www.amazon.com/BOJACK-Controller-Dimmer-Control-Switch/dp/B09P6CMRC9/ref=sr_1_45?gclid=CjwKCAjwiJqWBhBdEiwAtESPaIB_9v-ssgpi_3tx76fHnZVGWA-a8-X
> SsVYQUD1hig57HMAKLVPlzRoCu6QQAvD_BwE&hvadid=409997657456&hvdev=c&hvlocphy=9019332&hvnetw=g&hvqmt=e&hvrand=6712530865257829960& amp; amp;
> amp;hvtargid=kwd-320046497276&hydadcr=24630_11410023&keywords=12v+pwm+speed+controller&qid=1657206905&sr=8-45

--
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI

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Re: What rheostat do I need? [message #370079 is a reply to message #370074]

Thu, 07 July 2022 15:32

Larry

Messages: 2875
Registered: January 2004
Location: Menomonie, WI

Karma: 10

Senior Member

Thanks Steve, I'll find a way to mount it.

Larry

78 Royale w/500 Caddy
Menomonie, WI.

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[GMCnet] Re: What rheostat do I need? [message #370080 is a reply to message #370074]

Thu, 07 July 2022 15:32

Larry

Messages: 2875
Registered: January 2004
Location: Menomonie, WI

Karma: 10

Senior Member

Thanks Steve, I'll find a way to mount it.
--
Larry
78 Royale w/500 Caddy
Menomonie, WI.
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Larry

78 Royale w/500 Caddy
Menomonie, WI.

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Re: What rheostat do I need? [message #370088 is a reply to message #370074]

Fri, 08 July 2022 07:12

jhbridges

Messages: 8412
Registered: May 2011
Location: Braselton ga

Karma: -74

Senior Member

You might also consider a single fixed resistor to get a lower fixed speed.

--johnny

Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons. Braselton, Ga. I forgive them all, save those who hurt the dogs. They must answer to me in hell

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[GMCnet] Re: What rheostat do I need? [message #370089 is a reply to message #370074]

Fri, 08 July 2022 07:12

gmc-email-list

Messages: 124
Registered: February 2019

Karma: 2

Senior Member

You might also consider a single fixed resistor to get a lower fixed speed.

--johnny
--
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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