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Old 18th January 2013, 12:33 PM   #31
Boscoe is offline Boscoe  United Kingdom
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Getting into the triple zeros with distortion is massively dependant on layout.
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Old 18th January 2013, 05:32 PM   #32
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Quote:
Originally Posted by Boscoe View Post
Getting into the triple zeros with distortion is massively dependant on layout.
Hi Boscoe, that's a suggestive remark; would you have anything more tangible to say?

I prototyped the layout (T-shape with opposite transistors and an unobstructed ground plane) with my MF80 design, and taking out the noise floor it measured around 0.000117 THD (see 10KHz FFT of MF80; the worse distortion at the lower freqs was due to a too low value feedback cap. This was measured with a PC/soundcard setup, hence the noise floor.

So, I'm very confident about the layout; it's the actual circuit design that will be the exciting part Will it work as intended or will I end up with smoke? We'll see..

Regardless, feel free to tell any hints that I might incorporate to end up with a better design.
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Old 18th January 2013, 06:01 PM   #33
Boscoe is offline Boscoe  United Kingdom
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Quote:
Originally Posted by MagicBox View Post
Hi Boscoe, that's a suggestive remark; would you have anything more tangible to say?

I prototyped the layout (T-shape with opposite transistors and an unobstructed ground plane) with my MF80 design, and taking out the noise floor it measured around 0.000117 THD (see 10KHz FFT of MF80; the worse distortion at the lower freqs was due to a too low value feedback cap. This was measured with a PC/soundcard setup, hence the noise floor.

So, I'm very confident about the layout; it's the actual circuit design that will be the exciting part Will it work as intended or will I end up with smoke? We'll see..

Regardless, feel free to tell any hints that I might incorporate to end up with a better design.
Sorry no I was unable to view the layout I posted because of my phone. It looks good however. You might be better off with 4 layers for an amp of this potential and complexity?
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Old 23rd January 2013, 09:28 AM   #34
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I think that's goung to be quite expensive, I'll have to figure out costs first. Besides, I made a few more modifications removing more bottomside copper. Right now I'm going to focus on the case and the output power supply which is huge. I gotta find me a cheaper PCB factory too Eurocircuits is good but very expensive.
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Old 23rd January 2013, 10:50 AM   #35
Boscoe is offline Boscoe  United Kingdom
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Eurocurcuits is the cheapest I have found in Europe. Let me know of any others if they are cheaper.
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Old 24th January 2013, 07:49 AM   #36
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Try prototypy.com.pl, great quality, reasonable prices. I never was disappointed. There is price calculator. Unfortunately polish only, but if you need any assistance, let me know.
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