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Old 11th February 2012, 07:03 PM   #11
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Resolution is not that high so we can read components numbers.
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Old 11th February 2012, 07:04 PM   #12
lhquam is offline lhquam  United States
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Toecutter:

My main criticism with your layout is that the high current paths must be MUCH larger. These are all of the paths from the V+/V- supply rails thru the source resistors, diodes, output mosfets, and to the output terminals. Similarly, the connection ffrom the power supply ground to the speaker ground must be larger. There could be star-grounding issues related to R3, R4, and P3. Best that that ground be derived more directly from the ground at the input connector block.
There are also (less serious) signal currents thru the feedback resistors R7-R10 that suggest larger traces. In general, there is little or no cost associated with using large traces. For the highest current paths, you can also run traces on both sides of the board, connected with additional vias.
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Old 11th February 2012, 07:07 PM   #13
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Yes, looks like star grounding issues.
Input jfets benefit to be in touch for temperature tracking.

Last edited by bobodioulasso; 11th February 2012 at 07:12 PM.
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Old 11th February 2012, 07:29 PM   #14
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Quote:
Originally Posted by Tea-Bag View Post
350MM probably makes it too big to fit into the common Conrad heatsinks a lot people use. A little smaller might be nice, only if this is something you plan on getting rid of.
What size are the conrad heatsinks?
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Old 11th February 2012, 07:32 PM   #15
CeeVee is offline CeeVee  Portugal
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300mm
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Old 11th February 2012, 07:34 PM   #16
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Maybe this help single sided duble mosfets cascoded duble imputs.
No current limiters space for 2 futabas source resistors
Sorry crapy picture was on MYF5 tread may see better there

At work at present but can do better tomorow if you like
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Last edited by Bksabath; 11th February 2012 at 07:36 PM.
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Old 11th February 2012, 07:41 PM   #17
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Also from same tread
Triple not cascoded the first ones I built.

main thing is no need for duble side and Keep tracks shorth (this is a very fast amplifier and smal parasitic capacitance is a potential problem)

Gate resitor track as shorth as possible to the mosfet pin is realy good advice
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Old 11th February 2012, 08:17 PM   #18
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Yeah make as one

DesignSpark | The gateway to online resources and design support for engineers

You can get free PCB software from above link

To stick ground plane on anythink it just takes a couple of mouse clicks the real skill which I dont have is to line up the mask to both sides of the board and facing the right way up which I find mind bogling complicated you get more chances to get decent conversation out of potato trough which a direct current is passed than me doing this right the first time

PS all this is in good umor
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Old 11th February 2012, 08:20 PM   #19
CeeVee is offline CeeVee  Portugal
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yeah double sided at home is tough

I use Sprint ever sine Manu pointed me that way...just what audio guys need ...no more no less :-)

..and not expensive to boot.
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Old 11th February 2012, 10:05 PM   #20
Zen Mod is offline Zen Mod  Serbia
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yeah

Mighty Manu is my Yoda ......

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