bigjohn Posted January 26, 2010 Share Posted January 26, 2010 Has anyone ever replaced a 24V fan with a 12V fan, perhaps using a resistor? I'm thinking there are 12v fans with much lower noise than there is in the back of my amp, with similar airflow flow ratings. Quote Link to comment Share on other sites More sharing options...
Mr. Foxen Posted January 26, 2010 Share Posted January 26, 2010 [quote name='bigjohn' post='724938' date='Jan 26 2010, 11:08 AM']Has anyone ever replaced a 24V fan with a 12V fan, perhaps using a resistor? I'm thinking there are 12v fans with much lower noise than there is in the back of my amp, with similar airflow flow ratings.[/quote] Probably better getting a 24v fan with less noise, for computers, best is probably find a PC techy forum and see what they suggest. Quote Link to comment Share on other sites More sharing options...
bigjohn Posted January 26, 2010 Author Share Posted January 26, 2010 [quote name='Mr. Foxen' post='725054' date='Jan 26 2010, 12:46 PM']Probably better getting a 24v fan with less noise, for computers, best is probably find a PC techy forum and see what they suggest.[/quote] I've had a look about. All the PC ones I've found with lower db levels are 12v. Its got one these in at the moment... [url="http://octopart.com/8414-ebm-papst-3282"]papst 8414[/url] and supposedly they're quiet @ 35dba. I'll have another scout. Ta. Quote Link to comment Share on other sites More sharing options...
Mr. Foxen Posted January 26, 2010 Share Posted January 26, 2010 [quote name='bigjohn' post='725127' date='Jan 26 2010, 01:41 PM']I've had a look about. All the PC ones I've found with lower db levels are 12v. Its got one these in at the moment... [url="http://octopart.com/8414-ebm-papst-3282"]papst 8414[/url] and supposedly they're quiet @ 35dba. I'll have another scout. Ta.[/quote] Go dual contra-rotating, that would be cool. Quote Link to comment Share on other sites More sharing options...
bigjohn Posted January 26, 2010 Author Share Posted January 26, 2010 They sound interesting, but I can't find any! I'd like one of [url="http://www.noctua.at/main.php?show=productview&products_id=9&lng=en"]these[/url] I think... but it's only rated up to 13v. I reckon there's got to be a way. This fan actually comes resistive adapters to lower the voltage > rpm > noise, but 24v is outside of their scope innit. Quote Link to comment Share on other sites More sharing options...
Mr. Foxen Posted January 26, 2010 Share Posted January 26, 2010 [quote name='bigjohn' post='725243' date='Jan 26 2010, 02:56 PM']They sound interesting, but I can't find any! I'd like one of [url="http://www.noctua.at/main.php?show=productview&products_id=9&lng=en"]these[/url] I think... but it's only rated up to 13v. I reckon there's got to be a way. This fan actually comes resistive adapters to lower the voltage > rpm > noise, but 24v is outside of their scope innit.[/quote] Use two. Reverse polarity and facing each other. Although I think the fans are made to only turn one way. Just like isobaric speakers. Shoot up the fan diameter. [url="http://www.afrotechmods.com/fanmod.htm"]This might help somewhere.[/url] Quote Link to comment Share on other sites More sharing options...
bigjohn Posted January 26, 2010 Author Share Posted January 26, 2010 [quote name='Mr. Foxen' post='725251' date='Jan 26 2010, 03:03 PM']Use two. Reverse polarity and facing each other. Although I think the fans are made to only turn one way. Just like isobaric speakers. Shoot up the fan diameter. [url="http://www.afrotechmods.com/fanmod.htm"]This might help somewhere.[/url][/quote] Good idea, BUT... there aint enough room in the back for 2. And 2 would be twice as loud (well perhaps not twice but...) I've spoken to the fella I take my broken amps to... . He says stick a regulator in there. And he'll do it for me the kind chap he is. All good. Quote Link to comment Share on other sites More sharing options...
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