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Old 30th November 2011, 08:12 PM   #111
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Quote:
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Even though that might be true, but even a hanging open circuit with only one end connected could effect the sound. That is why the "ground side electrons" thing works.
Both ends should be disconnected...

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It seems you could still move the limiter to the right.
I thought you asked me to make some more distance between the limiter and the compensation network...

No problem, it's even better.

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I wonder if it's a good idea to have the resistor heat sink against the cap, and also it seems that the real heat sink would interfere with the OUT connector because the relation between the legs and the heat sink is different. What might be a way to solve it is rotate the resistor clockwise by 90 deg and rotate the heat sink counterclockwise 90deg and correct the relation between heat sink and resistor leg. This will give you more room around the OUT connector.
I'm not sure that I've understood correctly but I'll give it a try.
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Old 30th November 2011, 10:57 PM   #112
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I'm not sure that I've understood correctly but I'll give it a try.
Like this?
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Old 1st December 2011, 01:38 AM   #113
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that's the general idea, just check and see if the clearance around the OUT connector is enough to plug in the thick wires normally used.
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Old 3rd December 2011, 01:21 AM   #114
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Default Bigger PCB

I've managed to buy Eagle Hobbyst Edition so I've made a bigger layout (100x100mm).

Now is all more spaced and 'relaxed' and more components are through hole and there is room to use a screwdriver to fix LM3886 with caps mounted...

Any opinion is welcome
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Old 3rd December 2011, 09:52 AM   #115
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Are all the surface mount components on the same side of the PCB?
Does Eagle PCB allow smooth turns in the traces and teardrop pads?
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Old 3rd December 2011, 01:45 PM   #116
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Are all the surface mount components on the same side of the PCB?
Sure, on the bottom one.

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Does Eagle PCB allow smooth turns in the traces and teardrop pads?
Smooth turn yes, teardrop pads no, unless you draw them manually on each pad.

Do you think that smooth traces are better? Why?
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Old 3rd December 2011, 01:55 PM   #117
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I don't have any data to prove it. But the more current flows though a wire, keeping smooth traces seems to reduce any reflected energy. Same as water flow or acoustic waves. It usually is not the most important issue, but if you can put that in conveniently, it's better to do so.

I would also still recommend trying to move the limiters away from the OUT path.
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Old 4th December 2011, 03:06 AM   #118
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Ok, I've made a 'rounded' version... how it looks?

This time I'm attaching some Eagle3D render so people could have an idea of the SMD parts...
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File Type: jpg My_Ref_FE - PCB.jpg (359.7 KB, 158 views)
File Type: jpg My_Ref_FE BOTTOM.jpg (176.2 KB, 146 views)
File Type: jpg My_Ref_FE TOP.jpg (242.8 KB, 152 views)
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Old 4th December 2011, 06:02 AM   #119
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Looks great. FYI the TP Rev C board is a good example of smooth routing. I just opened up my ref C to do the compensation mod you PMed me.
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Old 4th December 2011, 06:10 AM   #120
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Dario,

Looks like you have already got a good grasp of this software, and I'm impressed. The design is looking really good for ease of building because it is much less cluttered than your previous attempts.

Now that the board is bigger, is there room enough to lay the resistors near the regulators down instead of standing them upright? Can you make a little more room around the 318? It looks pretty tight for the caps nearby.

Perhaps some of the traces with large radius should be straightened again to make the path shorter. I'm not sure what is really gained by using such large curves, but I think a shorter path is always better. Other than extra length, I do like curves.

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Tom E
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