Bigger fans = not necessarily better

politicorific · 8th February 2006, 02:59 AM

Since first getting projections working I've been working out the bugs (fixing light leaks, designing new frames, and improving cooling). During my redesign I opted for larger fans 80mm to 120mm. Only thing is that the only stuff I could find locally were 24volt panaflos. Instead of the usual quiet Panaflo, these 24v ones running at 12v are much too loud(but at least they do a great job of keeping things cool, I set up 2 opposite from each other which do a great job of cross circulating air over the lamp.

Trouble now is that they are overkill. I've tried 9,7,6,5,4.5 volts and they refuse to operate - even if I get them started at 12volt and then switch over. Unfortunately I don't have anything between 9 and 12 volts to test with - although I may try some batteries in series).

Can anyone suggest 120mm fans that are quiet? I think the 24 volt thing is my problem - the 7volt computer power supply trick would be excellent for this.

v1d9uy · 8th February 2006, 03:01 AM

yea most plane cheap 120mm computer fans are perty quiet granted you then have to use a pc power supply.. or make one..

shardian · 8th February 2006, 03:16 PM

I got mine from www.surplusshed.com . They sell brand new 120mm 12v dc fans for $5. I run one at 9 volts, and it is super quiet and pushes a ton of air. I cooled one of the 300W halogen slide projection assemblies from surplusshed with it, and the whole metal assembly stayed cool to the touch!

8th February 2006, 02:59 AM	#1
politicorific Account disabled at member's request Join Date: Aug 2005	Bigger fans = not necessarily better Since first getting projections working I've been working out the bugs (fixing light leaks, designing new frames, and improving cooling). During my redesign I opted for larger fans 80mm to 120mm. Only thing is that the only stuff I could find locally were 24volt panaflos. Instead of the usual quiet Panaflo, these 24v ones running at 12v are much too loud(but at least they do a great job of keeping things cool, I set up 2 opposite from each other which do a great job of cross circulating air over the lamp. Trouble now is that they are overkill. I've tried 9,7,6,5,4.5 volts and they refuse to operate - even if I get them started at 12volt and then switch over. Unfortunately I don't have anything between 9 and 12 volts to test with - although I may try some batteries in series). Can anyone suggest 120mm fans that are quiet? I think the 24 volt thing is my problem - the 7volt computer power supply trick would be excellent for this.

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8th February 2006, 03:01 AM	#2
v1d9uy diyAudio Member Join Date: Oct 2005	yea most plane cheap 120mm computer fans are perty quiet granted you then have to use a pc power supply.. or make one..

8th February 2006, 03:16 PM	#3
shardian diyAudio Member Join Date: Oct 2005	I got mine from www.surplusshed.com . They sell brand new 120mm 12v dc fans for $5. I run one at 9 volts, and it is super quiet and pushes a ton of air. I cooled one of the 300W halogen slide projection assemblies from surplusshed with it, and the whole metal assembly stayed cool to the touch!

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