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Old 11th May 2014, 10:24 PM   #1
ro9397 is offline ro9397  United States
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Default 12V fan replace 24V?

OEM fan is 80mm 24V single-speed w/on-off sensor. Toward less noise I consider replacing with THIS 92mm 12V 3-speed.

I presume the 12V runs OK but at slower RPM, plus its 15% larger size and highest speed setting provide adequate airflow. (Receiver has thermal protection circuit.)

Please advise.

Also, prior to above fan swap: I fist desire to install THIS zener diode to slow OEM fan speed for less noise. Mouser has MOQ of 1000. Who sells that part or similar functioning part in small numbers?
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Last edited by ro9397; 11th May 2014 at 10:32 PM.
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Old 11th May 2014, 11:02 PM   #2
ro9397 is offline ro9397  United States
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Sorry I got it backward. I see now the 12V fan runs at twice its speed at 24V with corresponding quick burn out (not slower speed as in the OP).

Someone posted a "12V zener" is appropriate to drop 24V to 12V. I'd much appreciate a link to the correct part.
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Old 11th May 2014, 11:21 PM   #3
evanc is offline evanc  United States
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I had a need for a 24volt fan and had 2 12volt units on hand....stacked them up and ran them in series....seems OK.
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Old 12th May 2014, 02:09 AM   #4
ishiru is offline ishiru  Indonesia
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zener would be good w/ a dropping resistor.

or the other technique, use regulator.

please mind the power dissipation of the fan.you might want a big resistor wattage like i did (now using regulator as 10W resistor getting pretty hot)
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Old 12th May 2014, 04:09 AM   #5
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Another option...make a ccs circuit using a transistor. Saves the fan from high currents also.

Gajanan Phadte
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Old 12th May 2014, 04:38 AM   #6
ro9397 is offline ro9397  United States
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Quote:
Originally Posted by ishiru View Post
zener would be good w/ a dropping resistor.

or the other technique, use regulator.

please mind the power dissipation of the fan.you might want a big resistor wattage like i did (now using regulator as 10W resistor getting pretty hot)
I'd much appreciate a schematic of your regulator circuit.
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Old 12th May 2014, 04:39 AM   #7
ro9397 is offline ro9397  United States
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Quote:
Originally Posted by gmphadte View Post
Another option...make a ccs circuit using a transistor. Saves the fan from high currents also.

Gajanan Phadte
Would you be so kind as to provide a schematic diagram?
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Old 12th May 2014, 05:53 AM   #8
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Google is your friend - there is a ton of info sitting on the web and ready to go.
This is as simple as it gets: 24V 12V DC DC Converter - Storage
Note that it may be assumed that experimenters know these regulators require a TO220 size heatsink.
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Last edited by Ian Finch; 12th May 2014 at 05:55 AM.
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Old 12th May 2014, 06:53 AM   #9
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Put the regulator behind the fan.
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Old 12th May 2014, 08:16 AM   #10
Vostro is offline Vostro  South Africa
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Quote:
Originally Posted by Welcome View Post
Put the regulator behind the fan.
, linear regulator can get very hot. I use series resistor with fan, and then place 12v zener over fan, to steady voltage, so it doesn't creep up.

I don't care how hot resistor gets, no runaway effect here.
Knowing 12V fan, current draw makes calculating (guessing) resistor easy

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Last edited by Vostro; 12th May 2014 at 08:19 AM.
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