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MM28 phono preamplifier
MM28 phono preamplifier
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Old 10th December 2016, 03:54 PM   #1
Project16 is offline Project16  France
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Default MM28 phono preamplifier

Hello everyone

I would like to realize the MM28 phono preamplifier of Mr. APEX and for that I drew a circuit and before sending it in manufacture I want to know if there are things that do not go.

Thank you.
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Old 10th December 2016, 05:52 PM   #2
sgrossklass is offline sgrossklass  Germany
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1. Your ground fill is, let's say, less than ideal. It is running all around the circumference of the board = instant built-in ground loop. You've also got some patches connected via very thin bridges only, those are of somewhat dubious utility. So your grounding will definitely need some work.
2. You are using the same trace widths everywhere. At least give power and ground something a bit wider.
3. It is usually better to do an "inside out" layout that keeps the supplies together (hence, low inductance).
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Old 10th December 2016, 06:15 PM   #3
Project16 is offline Project16  France
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Ok sgrossklass, thanks for that answer.
I will try to correct all this but it is not very simple because the schema is really complex and I do not have the level of Alex MM!
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