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rdowdall  
#1 Posted : Tuesday, June 12, 2012 12:10:23 AM(UTC)
rdowdall

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Hello - I have a non-working McIntosh MCD-7000 CD player that I've decided to use as a chassis for the dac. The chassis has a nice heat sink on the back.

Would it make sense to relocate the transistors from the Placid HD power supply? I also have enough room to use 2 inch heat sinks.

Thanks




MCD7000
Brian Donegan  
#2 Posted : Tuesday, June 12, 2012 12:47:36 AM(UTC)
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I would not relocate the transistors, but you could just mount the power supplies directly on the heatsink...
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rdowdall  
#3 Posted : Tuesday, June 12, 2012 1:14:00 AM(UTC)
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Good Idea, Thanks
Mace_be  
#4 Posted : Sunday, September 2, 2012 3:05:45 PM(UTC)
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Hello,

I have also used and old amp's heatsink. But I actually have relocated the transistors with about 5cm (2inches) wire.

I have done this with 1 Placid HD BP and 2 Placid HD SP.

But I have some problems with the ouput voltage fluctuations.

I let the fairly large heatsink(with active cooling standard pc 12V. 80mm Fan running at 5V) warm up for about half a hour.
Then i set Vout to 5.25V.

When I let the heatsink cool off and put it on again, Vout wil rise to 5.65V (Which is to large for the Tridents reg.).

Is this because I use a big heatsink which takes some time to warm up ?
I am aware of the negavtive temp coeff of the placid design.

Does anyone experiences the same problem : A too large startup voltage ?
Thanks.
Mace_be  
#5 Posted : Monday, September 3, 2012 7:11:23 AM(UTC)
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Problem solved.

I let the fan run constantly so the heatsink does not get warm.
and therefore the "working" temp is reached fast, and then I set the 5.25V.
So now it stays at 5.53V for a few minutes and then it will drow to 5.25V.

The heatsink does not get warm, and stays cool and the 5V fan I even can't hear it.

Thanks
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