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Old 22nd March 2013, 07:58 PM   #1
tony Ma is offline tony Ma  United States
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Default Need opinion

Hi All,

Here is PCB that I will use for Aleph 30

My questions are

1. PCB trace is about 5 mm is that ok?
2. Input and out voltage is close, is that ok? ussually I seen Input voltage on one side and the out put is on the other side

let me know please....
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Old 22nd March 2013, 08:01 PM   #2
DF96 is offline DF96  England
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Are the labels correct? You seem to have D- connected to V+.
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Old 22nd March 2013, 08:05 PM   #3
tony Ma is offline tony Ma  United States
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Originally Posted by DF96 View Post
Are the labels correct? You seem to have D- connected to V+.
Yeah you are right.... supposedly the other way around
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Old 22nd March 2013, 08:09 PM   #4
tony Ma is offline tony Ma  United States
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Corrected
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Old 22nd March 2013, 09:29 PM   #5
godfrey is offline godfrey  South Africa
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Quote:
Originally Posted by tony Ma View Post
Corrected
Why not use more copper? e.g. Thicken the V+ and D+ tracks and fill in the whole center area between GND and D-. It doesn't cost any extra. In fact if you're etching you're own boards, it saves money.

P.S. Are those resistors supposed to be 0.47 Ohms? Seems too low for effective filtering.
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Old 22nd March 2013, 09:44 PM   #6
DF96 is offline DF96  England
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Quote:
Originally Posted by godfrey
Thicken the V+ and D+ tracks and fill in the whole center area between GND and D-.
You just have to be careful that ground currents from charging pulses don't end up in the wrong place. Leaving the ground trace as a line rather than an area maintains the clear distinction between PSU input from rectifier (dirty) and PSU output (clean). Then the clean end can go to the signal ground without injecting buzz.
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Old 23rd March 2013, 12:00 AM   #7
tony Ma is offline tony Ma  United States
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Quote:
Originally Posted by DF96 View Post
You just have to be careful that ground currents from charging pulses don't end up in the wrong place. Leaving the ground trace as a line rather than an area maintains the clear distinction between PSU input from rectifier (dirty) and PSU output (clean). Then the clean end can go to the signal ground without injecting buzz.
I got what you are saying

Maybe this one is better?
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Old 23rd March 2013, 12:02 AM   #8
tony Ma is offline tony Ma  United States
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Quote:
Originally Posted by godfrey View Post
Why not use more copper? e.g. Thicken the V+ and D+ tracks and fill in the whole center area between GND and D-. It doesn't cost any extra. In fact if you're etching you're own boards, it saves money.

P.S. Are those resistors supposed to be 0.47 Ohms? Seems too low for effective filtering.
What value you are suggesting for the resistor?
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Old 23rd March 2013, 01:21 AM   #9
godfrey is offline godfrey  South Africa
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Quote:
Originally Posted by tony Ma View Post
Maybe this one is better?
Yes, but it still needs more copper. You're etching away all the good stuff.

Quote:
Originally Posted by tony Ma View Post
What value you are suggesting for the resistor?
No suggestion, I was just surprised at the value. If that's what Nelson suggests, I certainly won't argue.
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Old 23rd March 2013, 01:35 AM   #10
tony Ma is offline tony Ma  United States
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[QUOTE=godfrey;3423310]Yes, but it still needs more copper. You're etching away all the good stuff.

What about this??
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