sss said:hey guys
what do u think of using cpu cooling fan and heatsink with a gainclones? will it be big enough?
It should work fine depending on the size of the sink and fan. Marshall amplifiers uses a TDA7294 @ 50 W in there MG series amplifiers and keeps it cool by the method that you describe. It would appear to be the size of a Pentium CPU with fins approximately an inch tall. An Athlon heat sink would be even better, although you may have to speed control the fans.
Later,
If you do want a fan, use a low noise model like this one.
An externally hosted image should be here but it was not working when we last tested it.
tg3 said:If you do want a fan, use a low noise model like this one.
Too noisy.
Choose a Papst fan, even the noisiest of those produce only 19 db(A). I use 3 of thier 9 db(A) coolers and even if put my head against the cabinet I can't hear them (during the day, in the middle of the night it's just about noticable).
I've tried GC with CPU heatsinks and fans. The fans were not "silent-grade" like the ones in the picture and I couldn't stand the noise. However, when I lowered the power supply voltage for the fans to let them run at lower speed, they became very quite. So, if you use "silent-grade" fans at slightly lower than the rated voltage, you will hardly hear the fan noise. But, you cannot lower the power supply voltage too low because fans need minimal amount of voltage (and current) to operate.
Good luck.
Jai
Good luck.
Jai
IMHO a fan cooled HS is kinda a waste of money and effort. I just use a large heavy(.5-1.5 lb) gold plated brass bar. It gets lots of mass isolation as well as a HS action.Alhough my next design is using the bar with a finned normal HS thermally and mechanically connected.
ron
ron
i dont think that this will be enoughmatjans said:why not just use any old left-over processor heatsink without a fan? Anything from a pentium HS and upwards should have enough capacity to cool an lm3875.
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