| Re: TDA7293 parallel design DIY [message #81365 is a reply to message #81185] |
Sat, 30 May 2015 06:13   |
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hydrovac
Messages: 9
Registered: December 2014
Location: Hyderabad
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Esquire |
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Ok, further on the project:
I found an old enclosure which can accommodate the amp board, heat sink, power transformer rectifier and filter capacitors... the trafo is a 32-0-32 250VA... searches seem to suggest this is the absolute upper limit for TDA7293 setup.
The heat sink I have, also cannibalized from a fried receiver is 11" wide, 3.25" tall, and sports 22 fins, each being 2" long. It weighs about 1.5 kg., give or take. Assuming I can get a decent enough thermal contact for each IC, does this heat sink sound like it will have enough mass to support two TDA7293s? (Yeah, I know there's a lot of thermodynamics data that would be needed to get an accurate reading on whether/how well this 'sink will work, but all I can give are raw measurements.)
For the smoothing circuit, I'm using quad 1200uF capacitors (low-ESR caps designed for power-supply filter applications) per board, in addition to the dual 6,800uF caps in the supply rails. Will this be adequate at least initially, or would it be wise to snag a few 10,000uF monsters to add to the power filtration?
That's all I can think of right now... more as I come up with it.
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