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Fantastic Fan variable speed control

Fan Fantastic Fan Modification Speed adjustment

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#21 Lighthawk

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Posted 30 July 2015 - 02:35 PM

Thanks for the heads up.  My unit arrived and looks nearly identical, except green led vs. red on the board.


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#22 huskyrunnr

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Posted 30 July 2015 - 04:06 PM

I wish these companies would post their specs, if indeed it is acoustic humming due to the pwm controller frequency being in the audible range. I contemplated ripping Mr. billharr's soundtrack off of youtube and dumping it into Audacity to get the spectrum of the noise, but then there is no frequency specification to compare with the noise. It will be interesting to hear what Mr. billharr learns from the vendor.

 

I've been interested in this for quite some time. I guess I can either go for low freq. PWM with adequate filtering, or High freq. PWM.

 

I found a few boards that were just above 20kHz and that would be good to try. It might drive your cat crazy...

 

Here is a tech bulletin on how to add a smoothing capacitor to a PWM controller that is causing audible humming: link is a pdf file

 

http://tinyurl.com/qeyax59

 

Looks like you want it before the output amp. A low pass LC subwoofer filter after the amp might work as well, but they are large and expensive.


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#23 billharr

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Posted 30 July 2015 - 08:20 PM

Here is what the vendor sent.

 

Dear bikeama,

hi
dear
please check item number :
161224478907
161778762424
it seems last can not more fit for you
 

- abstore08

  

 

I made links out of the item numbers that go to his ebay auctions.

 

161224478907  shows a PWM frequency of 21 kHz   will this be audible?

 

161778762424  has the discription below and sounds like it might work. What say the electrical experts?

 

fan c.jpg

 

 

 

 

 


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#24 huskyrunnr

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Posted 31 July 2015 - 05:26 AM

The latter looks good to me if its 21 kHz or more. I can barely hear that frequency at my age, 52. It all seems like a crapshoot without the specs.

Eta: Played around with audacity freeware. Don't know the limit of my super tweeters but I could only hear up to 15 kHz, my son was able to hear up to 19 kHz. I think I'd be good at 21 kHz pwm.

Edited by huskyrunnr, 31 July 2015 - 05:49 AM.

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#25 billharr

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Posted 22 August 2015 - 11:15 PM

Just an update. Thanks to Harv I have a controller that does not make noise ;-)

 

See video below, runs slow enough you can see the blades go by without any noise. Now do I want to cut a hole and put a fan in the front?????

 


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#26 ski3pin

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Posted 22 August 2015 - 11:20 PM

Just an update. Thanks to Harv I have a controller that does not make noise ;-)

 

<snip>

 

 

Thanks Bill, what controller (or fix) did you get and could you provide a link? Thanks.


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#27 billharr

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Posted 22 August 2015 - 11:49 PM

Ski, Harv sent me the controller he had two. I do not have the link but looked on Ebay and found this one that looks the same. As long as the frequency is high enough so you can not hear it it should work.  Still find it hard to believe how cheap these are.  

 

med_gallery_1903_342_622252.jpg


Edited by billharr, 23 August 2015 - 12:55 AM.

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#28 ski3pin

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Posted 23 August 2015 - 12:21 AM

Thanks Bill


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#29 EDR

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Posted 23 August 2015 - 04:45 PM

I've been following the discussion and had a few questions I hope someone can answer.
My camper has the basic vent, but no fan. I was going to buy a three speed with reverse model fantastic fan, but was wondering what affects the controller has on the fan's operation.

Does the controller affect the reversing feature, or is it controlled by a separate switch?
Can I buy a single speed fantastic fan (if they even make one) and install the controller for variable speed?
Could I buy a switch to (I assume) reverse the polarity so the fan will operate in reverse mode?
Finally, I see what I assume are older and newer model fantastic fans for sale on ebay. Is one version better or more reliable?

Any help or ideas would be appreciated.
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#30 PaulT

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Posted 23 August 2015 - 05:33 PM

For the factory 3 speed Fantastic Fan, there is a separate switch for direction - in or out
There are several models that fit in the standard vent. 3 speed is factory standard.
Options include the following: 14 speed, rain sensor, color for vent lid, thermostat, remote control, external cover so that fan can operate in rain without worrying about leaks.
If you are starting fresh, buy the one with options you want.

Paul
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