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PC USB scope project.
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Old 14th July 2019, 11:19 PM   #51
nigelwright7557 is offline nigelwright7557  United Kingdom
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Designing a partly SMD pcb for my latest version threw up a shortcoming in my pcbcad software. The PIC TQFP package and AD9200 A2D SSOP package are both "off grid".
So when I try to connect the tracks to the pins I have to do it free hand which is inaccurate. The pcb was looking terrible by the time I got loads of tracks in.
The tracks to the chip pins were often a little skewed.
So I got stuck into the software and came up with a couple of new functions.
The first function using Control - B key produces a new track segment which lines up backwards to the component pin it came from.
The second function Control - R key produces a right angle from current track position to the next pin to connect to. Both are controlled by current mouse pointer position so you get a choice of which way the tracks goes.
The tracks are now all spot on and look much more professional.
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Old 15th July 2019, 02:27 AM   #52
anatech is offline anatech  Canada
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PC USB scope project.
HI Nigel,
At least you figured out how to correct that issue!

-Chris
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Old 15th July 2019, 03:08 AM   #53
nigelwright7557 is offline nigelwright7557  United Kingdom
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Quote:
Originally Posted by anatech View Post
HI Nigel,
At least you figured out how to correct that issue!

-Chris
Its just the fine pitched SMD that cause a problem.
It tends to be metric so doesn't fit in with the factors of 100 thou of an inch grid.
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Old 15th July 2019, 12:01 PM   #54
anatech is offline anatech  Canada
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PC USB scope project.
Yes, I have noticed this as well.
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