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Old 10th June 2010, 06:24 PM   #8071
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Beware, the coefficient of expansion for copper and aluminum are different.

This thing may get hot enough to cause bending due to this...
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Old 11th June 2010, 03:04 PM   #8072
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Is this the one you were talking about Andrew?

Natural convection heat sink
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Old 13th June 2010, 12:53 PM   #8073
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Here are some images from the above tool. What a great piece of software for a diy guy! The heat layouts are based on the cviller board spacing and a generic 16x20mm footprint dissipating 30W.

Click the image to open in full size.

Click the image to open in full size.

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Old 14th June 2010, 09:38 AM   #8074
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Yes, that is familiar.

adjust until the contact interface uner the device/s is at it's coolest
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Old 15th June 2010, 12:24 PM   #8075
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Would there be any gain to using separate supplies per channel i.e +- 68000uf or a single supply of +- 136000uf with the anti ripple resistors? between the caps
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Old 15th June 2010, 01:20 PM   #8076
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With a double supply ("monobloc" or "dual mono") the inter channel isolation is 100%.
With a single supply ("stereo") there is some interchannel "cross-talk" via the supply.

We're assuming in the second case there are two, not one power transformers??

In practice it may not make a real world difference to your ears - or it might.
Certainly opens up different chassis variations.

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Old 15th June 2010, 01:56 PM   #8077
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Hi.I have 600va transformer and it has 4x18v output.And i use them seperately.2x18v for one channel and other 2x18v for another channel.Is not it enough to deny crosstalking?I think it is not same as two transformer?Does it make big difference?
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Old 15th June 2010, 02:15 PM   #8078
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Should be fine umut... especially for a Class A design where the current draw is fairly constant...
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Old 15th June 2010, 02:37 PM   #8079
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Quote:
Originally Posted by umut1001 View Post
Hi.I have 600va transformer and it has 4x18v output.And i use them seperately.2x18v for one channel and other 2x18v for another channel.Is not it enough to deny crosstalking?I think it is not same as two transformer?Does it make big difference?
the core, the primary and the chassis are common between the two channels. That can never have as good separation as two monoblocks.
But, 4 isolated secondaries is a very big improvement on a shared set of secondaries.
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Old 15th June 2010, 02:49 PM   #8080
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Thanks for the response Bear. Yes I was intending to use two transformers in the one chassis with 4 bridge rectifiers. What would be the size of trannies to use as Nelson I understand uses a 300VA in the Firstwatt F5? Would two 300VA's be overkill?
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