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Old 26th November 2011, 07:01 PM   #1501
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Quote:
Originally Posted by Esperado View Post
May-be this can reduce a little distortion. (see around output)
Hi Christophe, you mean reducing the trace size the feeding feedback resistor from Output point?

Marc

Edit : May be something like this attached
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File Type: jpg SSA_TT35_brd5.jpg (126.5 KB, 558 views)
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Last edited by Idefixes; 26th November 2011 at 07:07 PM.
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Old 26th November 2011, 07:10 PM   #1502
tinitus is offline tinitus  Europe
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it looks very nice
but are you sure its good to place your most sensitive curcuit right the middle of your high power supply
well, basicly its just the two rectifier bridge that bothers me
but maybe its ok

I cant see the input connection ?

but strangely, lately I see more and more members place the output devices in a way that doesnt seem to make very good use of the heatsink
and even the most experienced ones
things like having outputs at the very top of a heatsink
and I really hate when you cant turn a board 180degr, without ending up with long wires etc
sometimes its like only designing a board fore the left channel, and forgetting how both channels look when mounted
stuff like power supply connection, signal wires etc

seems like a matter of not having patience and time to think it all through, very carefully
why such hurry ?

btw, I do like that your board looks different than usual
its 'refreshing', and good thinking
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Old 26th November 2011, 07:15 PM   #1503
sonnya is offline sonnya  Denmark
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Quote:
Originally Posted by Idefixes View Post
Sonnya excuse me for my sad electronic knowledge, could you explain more what you mean?

Marc
You should not excuse!!! We All have to start somewhere...

In my experience, the VAS stage in this AMP changes a lot in the warmup process. So you need a constant voltage source instead so that you Can get a stable idle current
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Old 26th November 2011, 07:27 PM   #1504
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Quote:
Originally Posted by tinitus View Post
it looks very nice
but are you sure its good to place your most sensitive curcuit right the middle of your high power supply
well, basicly its just the two rectifier bridge that bothers me
but maybe its ok

I cant see the input connection ?

but strangely, lately I see more and more members place the output devices in a way that doesnt seem to make very good use of the heatsink
and even the most experienced ones
things like having outputs at the very top of a heatsink
and I really hate when you cant turn a board 180degr, without ending up with long wires etc
sometimes its like only designing a board fore the left channel, and forgetting how both channels look when mounted
stuff like power supply connection, signal wires etc

seems like a matter of not having patience and time to think it all through, very carefully
why such hurry ?
Hi,

The PCB board will be place in the same orientation as in picture below (Input is in orange underlined). In the way of implamentation the output devices will be place in the first 1/3 from the heatsink bottom. The Heatsink fines will be verticaly oriented.
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File Type: jpg SSA_TT35_brd51.jpg (126.1 KB, 539 views)
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Old 26th November 2011, 07:28 PM   #1505
tinitus is offline tinitus  Europe
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btw, with cooler classAB, it would work nice mounting supply board vertically at one end of your heatsink

and please, look at size of available amp box design, height of heatsink, etc


btw, I do like that your board looks different than usual
its 'refreshing', and good thinking
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Old 26th November 2011, 07:33 PM   #1506
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Quote:
Originally Posted by Idefixes View Post
Hi,

In the way of implamentation the output devices will be place in the first 1/3 from the heatsink bottom.
them are prefect

but why not place bridge and caps 'below' them, opposite input ?

that way you would have supply line nicely placed close to bottom, and not flapping up in the upper half of your box
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Old 26th November 2011, 07:42 PM   #1507
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Tintinus,

I attached 3 internal sketch from what i have in mind : the first is a rear view, the second a front view with trafo in orange, the third a side view.

All what i built are DIY case. Dimension and configuration are always dicted by internal configuration. PSU section is in the upper parts of the board because Trafo is in taht same area on other heatsink side separated by a 2mm thick steel sheet.
Attached Images
File Type: jpg SSA_TT_35V_impl1.jpg (67.7 KB, 510 views)
File Type: jpg SSA_TT_35V_impl2.jpg (63.4 KB, 500 views)
File Type: jpg SSA_TT_35V_impl3.jpg (49.3 KB, 471 views)
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Last edited by Idefixes; 26th November 2011 at 07:47 PM.
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Old 26th November 2011, 07:57 PM   #1508
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Quote:
Originally Posted by Idefixes View Post
Hi Christophe, you mean reducing the trace size the feeding feedback resistor from Output point?
No, the larger, the better. I mean keeping voltage (or current) to the feedback resistor coming right from the output pin and only from there.
Tracks are not 0 ohms and at those currents, you can see differences in signals from different points.
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Old 26th November 2011, 08:26 PM   #1509
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Ok thanks for advice. I modify the layout this way
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File Type: jpg SSA_TT35_brd6.jpg (127.1 KB, 196 views)
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Old 26th November 2011, 08:40 PM   #1510
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Quote:
Originally Posted by Idefixes View Post
Tintinus,

I attached 3 internal sketch from what i have in mind

All what i built are DIY case.
ah, that is different, and clever

it is really very effective to have the heatsink go through bottom and top

I have experienced problems when having trafo close to input
but I guess your heatsink shields it nicely
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