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Old 4th May 2007, 02:39 AM   #11
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At 2.7 amps per channel, I'm also dissipating about 58 watts per output transistor. Just make sure you have enough heatsink if upping the bias is in the plans.

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Old 3rd June 2007, 06:42 PM   #12
Ryssen is offline Ryssen  Sweden
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I'm also dissipating about 58 watts per output transistor.
What transistors?Can they take it?
Regards ke
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Old 3rd June 2007, 07:08 PM   #13
Magura is offline Magura  Denmark
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Originally posted by Ryssen

What transistors?Can they take it?

You can approach 100W per device (IRFP240) if adequate heatinking is added to the equation.

Everything is do the impossible just takes a little while longer.
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Old 4th June 2007, 02:47 AM   #14
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Each IRFP240 had its own 12"x9.75" heatsink.
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Old 12th June 2007, 10:25 AM   #15
ssmith is offline ssmith  Kenya
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Hi again and sorry to bother.

I'm now stuck on what PSU caps to use --

1. a small number of 22,000uf/33,000uf screw terminal large can caps (like Cornell Dubilier)
2. a larger number of 10,000uf 35v snap-in caps (like Nichicon KG)
3. an even larger number of Panasonic FM 1800uf/35v caps (not too expensive from digikey).

The cost works out to be roughly the same, and I don't mind option#3 being a bit of a PITA to install and wire up, though I'm wondering if it would be worth the extra effort? From what I've gathered from searching here many people suggest using lots of smaller caps for low ESR and higher ripple, while others swear by the superiority of large cans.

Your thoughts would be appreciated.

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