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joensd

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Joined 2002
As fans increase the efficiency of the heatsink substantially it would be probably enough to supply 6-9V to the fan.
You´ll get much lower noise as well of course and the fan draws less current.
Watch the power dissipation of the 78xx-regulator.
Probably around 2W or so.

If you don´t have a class a amplifier you could also think about a temperature-control for your fan which only kicks in when it´s needed.

Cheers
Jens
 
M

millwood

Disabled Account
Joined 2003
I used a lm simple switching regulator (I think it is 2596) for my fans. It runs very cool (>90% efficiency) and needs 5 parts (including the regulator itself). Highly recommended.

You can put multiple fans in series (2 or 3 of them in your case) or to use a power resistor if your fan doesn't draw too much current.
 
J

joensd

Member
Joined 2002
the solution with a switcher would be the most elegant of course
but the main supply will also "see" the switching peaks as well!?
never tried and listened if it´s a substantial noise that´s created but an amplifier with poor PSRR probably won´t like it (or better your ears)
 
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