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Old 19th November 2008, 04:06 AM   #11
quasi is offline quasi  Australia
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Oops, important safety note;

Make sure you discharge all the capacitors you try. They could retain a voltage as high as the mains voltage x 1.4. This voltage will remain indefinately unless discharged and you would not want these waiting in your parts bin. I use a 1k resistor on a croc-clip lead.

Also insulate the arrangement or arrange it so it is out of harms way.

Cheers
Q
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Old 19th November 2008, 08:00 AM   #12
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You could do what I've done:

Replace the 120v fans with 220/240v fans.They run pretty quiet, work great and can be purchased surplus or ebay and cheap.
-Joe
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Old 20th November 2008, 10:44 AM   #13
infinia is offline infinia  United States
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How about a thermal cutout switch in series with the fan (NO normal open)? Usually can mount the switch on the output heatsink. Make sure the HS is isolated or chassis grounded, even better if the fan is operated off the XFMR secondary.

similar to http://www.electronicsurplus.com/com...oduct_id=90936

http://www.thermodisc.com/loadMedia....f&ReturnPage=8
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Old 20th November 2008, 10:52 AM   #14
AndrewT is offline AndrewT  Scotland
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what type of motor is fitted to a mains operated fan?
The motor type will determine the way to make it run slower.
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Old 20th November 2008, 11:28 AM   #15
HK26147 is offline HK26147  United States
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I would take the approach given by infinia: a thermal switch.
If, with a thermal switch, you find it is operating most of the time anyway in spite of the "generous" heat sinking. then make sure there is ample clearance around the amp and use a quieter external fan to push air in the same direction as the internal fans.
You will find that small room (table) fans produce a lot less noise then your average high speed muffin and has a higher cfm rating.
You may be also be able to find a quieter muffin fan ( with the same cfm ) to replace the existing one.
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