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PSU ground layout question
PSU ground layout question
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Old 7th December 2017, 12:52 PM   #1
JeffYoung is offline JeffYoung  Ireland
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PSU ground layout question
Default PSU ground layout question

I have a single-PCB headphone amplifier that I'm laying out (a clone of the Torpedo III).

The PSU schematic is attached. The principal B+ current goes in and out on the green arrows, so those traces are thick, and parallel each other as much as possible.

The principal heater current goes in and out on the red arrows. Those traces are also thick, and parallel each other nicely.

My question regards the voltage reference circled in blue. Thick or thin trace?

Thanks,
Jeff.

PS: I've also attached that section of my current board layout. The blue-circled trace is currently thick, and goes from the star to C4, passing under D1.
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Old 7th December 2017, 01:34 PM   #2
Mark Johnson is offline Mark Johnson  United States
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PSU ground layout question
I, personally, would make two modifications.

1. Create a new custom footprint for diode D1 with an additional 0.15 inches of lead spacing.

2. Connect C6 and C4 with an 0.175" wide trace on the red layer. But hey that's just me.

~
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Old 7th December 2017, 02:15 PM   #3
jan.didden is offline jan.didden  Europe
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This looks like it has been done by an autorouter. Is that the case?

Jan
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Old 7th December 2017, 03:44 PM   #4
JeffYoung is offline JeffYoung  Ireland
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PSU ground layout question
Hi Mark,

So you're voting for super-thick. Most of the footprints are custom anyway, so using a longer-spaced diode is easy.

Hi Jan,

No, it's all hand-routed. (Does the fact that it looks auto-routed mean I failed to make some optimisations that I should have?)

Cheers,
Jeff.
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Old 7th December 2017, 07:00 PM   #5
jan.didden is offline jan.didden  Europe
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Quote:
Originally Posted by JeffYoung View Post
Hi Mark,

So you're voting for super-thick. Most of the footprints are custom anyway, so using a longer-spaced diode is easy.

Hi Jan,

No, it's all hand-routed. (Does the fact that it looks auto-routed mean I failed to make some optimisations that I should have?)

Cheers,
Jeff.
Well I see a lot of tracks that are needlessly long, which normally is a sign of autorouting. The shortest path between two points is a straight line, or an almost-straight line ;-). That's important for any PCB, especially with relatively high currents.

Jan
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Old 7th December 2017, 09:34 PM   #6
JeffYoung is offline JeffYoung  Ireland
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PSU ground layout question
Quote:
Originally Posted by jan.didden View Post
Well I see a lot of tracks that are needlessly long, which normally is a sign of autorouting....
Ahhh, yes. We must all bear our crosses; mine's OCD.

Cheers,
Jeff.


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