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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Re: Bad Idea! posted by mike on March 20, 2002 at 08:58:39:
There were a few engineering students (phD candidates) who tried to design minimum capacity heat sinks for the amp and had significant thermal runaway problems. Also painted heat sinks had thermal runaway problems. It is best to err in favor of too much heat sink area than too little. The diode biasing circuit is integral to the heat sensing paramaters and fans may impede their operation. The amp was designed to work without fans. I believe the amps are biased too conservatively but thats just my opinion. I agree that cross cut heat sinks should be more efficient but I would design and bias without fans. If you read the web pages Leach offers then he says to turn off fans when biasing the amp. As to load, I used two 4 ohm Dale, 100watt aluminum encased resistors mounted to a big thermalloy heat sink and a fan at the bottom. A square wave I believe is much too stringest of an input. I'd try a sine wave in the middle audio passband. I would remove the filter network across the output. I hope you have pre-tested your circuit boards for other problems before doing what you're plan to do! I would be interested in the results. Cordially James
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Follow Ups
- Re: Bad Idea! - j.l.guillebeau@att.net 09:24:07 03/20/02 (3)
- Square wave cannot be used. - SysInfo 16:57:05 03/20/02 (1)
- Huh? - Steve Eddy 09:19:45 03/21/02 (0)
- One more thought! - j.l.guillebeau@att.net 12:20:21 03/20/02 (0)
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