7 amp aleph

[MEGA_amp]

The dissipation sheet doesn't account for my heatsink scenario. The sheet seems to suggest that i'm putting all 12 fets on one sink.

On each sink:

- 3 fets @ 670mA each
- each dissipating roughly 30 watts
- at 90 watts the heatsink spec is roughly 0.35°C/W (upon further inspection of the graph)

but i'm dissipating 360watts total, and the 0.35 would not be the correct number to enter into the equation. 0.35/4 (# of sinks per channel)...yes/no/maybe?

 

[jacco vermeulen]

- at 90 watts the heatsink spec is roughly 0.35°C/W

Wreung, a natural convected 12" length at 90W says 0.26 C/W

 

[MEGA_amp]

ok, so I was closer the first time.

Where do I go from here? Do I enter 48" for the sink length in the Thermoflo site?

 

[jupiterjune]

Where do I go from here? Do I enter 48" for the sink length in the Thermoflo site?

No, it looks like your next step is to attach your FETS to your heatsink. IT IS HUGE! You have plenty of cooling there! Don't sweat the small stuff!!!

JJ

 

[MEGA_amp]

You're right, I guess I'm nitpicking here. Off I go, hopefully in a few weeks/months these babies will be finished, so I can finally post some pics of a finished amplifier. I started this project in 2004...its been a long time!!


-john

 

[jacco vermeulen]

What's new, if you had the time of day you'd been chunking them out by the numbers, and telling others how to set them up.

JJ is spot on, you already built the cases and know they each handle 4 times 90W without melting a hole in the floor.
90 times 0.25 keeps the heatsinks at a nice 22.5 C's above ambient.
That the power devices will cope with 30W each is set too, so you might as well stick 'm to the plate.

The power company is gonna love you, with luck you'll score the consumer of 2008 title.