Self etched PCBs: what trace width and spacing should I use? - Page 2 - diyAudio
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Old 21st November 2004, 02:06 PM   #11
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Keep any spacings between hi voltage and signal lines at least 4 mm. This means between anything over 40V peak and signal or ground level.

This is a UL standard for safety spacings.

I do 15 mil tracks all the time on home made boards.
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Old 21st November 2004, 02:08 PM   #12
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it's not for high voltage

ps will be +-15V, and signals aroung 2V rms
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Old 21st November 2004, 02:16 PM   #13
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Does this look acceptable?

Spacing is eagle's default setting (8mil), but I changed the trace width to 1mm

http://roulz.free.fr/DIY/board.pdf
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Old 21st November 2004, 02:19 PM   #14
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I'd leave a bit more spacing than that, otherwise soldering will be a real pain...
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Old 21st November 2004, 02:35 PM   #15
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Quote:
Originally posted by pinkmouse
I'd leave a bit more spacing than that, otherwise soldering will be a real pain...

OK.
For soldering, so just arounf the pads, or also for the tracks?

This spacing allows me to have a full groundplane, going nearly everywhere since it even goes between the pads.

Are the traces ok, or too thick?
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Old 21st November 2004, 03:56 PM   #16
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Here are 2 others:

http://roulz.free.fr/DIY/board-12.pdf (12mm spacing)

http://roulz.free.fr/DIY/board-16.pdf (16mm spacing)
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Old 21st November 2004, 05:37 PM   #17
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HP4 Laser will print very cleanly down to 1/64 inch, both trace and spacing (.3969mm for the rest of the world.)

Prosit
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Old 21st November 2004, 06:54 PM   #18
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So, only down to 16mil??

I printed the first pdf (8mil) on my canon bubble jet, on a sheet of paper
and the result is ok (except at one 45° trace)

so a laser printer on a transparency will do better, I think
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Old 21st November 2004, 07:10 PM   #19
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I have made pcb's with 13 mil traces but this is something you must test yourself. I have made pcb's with traces between IC pins.
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Old 21st November 2004, 08:10 PM   #20
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13mil? That seems small

what's a reasonable width for line level audio signal?
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