[Diy_efi] PCB layout

[Bill Washington]

> Subject:
> [Diy_efi] circuit and PCB proofreaders?
Steve,
	Two comments,
	1. In a number of place on the pcb you have traces running parallel at minimum 
spacing for 1 two 2 inches, these will tend to couple sharp rising edges to each 
other, particularly as there seems to be no ground plane. I would separate these 
traces by 3 to 4 times the track width where possible.
	2. I would suggest flooding the board top and bottom with ground plane. since 
the board is no very tight that should not be a problem. You can add extra vias 
to tie the ground planed on both sides together and also to get the ground plane 
into areas blocked off by tracks and components.

	The ground plane flooding reduces coupling between tracks and also makes it 
less prone to external interference coupling in.

Regards
Bill


> From:
> "Steve Ravet" <Steve.Ravet at arm.com>
> Date:
> Mon, 10 Apr 2006 23:07:58 -0500
> To:
> "diy_efi" <diy_efi at diy-efi.org>
> 
> To:
> "diy_efi" <diy_efi at diy-efi.org>
> 
> 
> I've created a PCB using Eagle PCB software.  Before I send it off I'd appreciate some comments, especially on the PCB and any issues that may affect reliability or manufacturability.  I have gifs of the schematic and the PCB on the FTP site:
>  
> ftp://diy-efi.org/uploads/sgr/usb_vpw.gif
> ftp://diy-efi.org/uploads/sgr/usb_vpw_pcb.gif
>  
> This is a USB to VPW converter, that will allow connecting a PC to a GM OBD2 computer via the USB port.  It will work for scan tool operations or reflashing operations.
>  
> thanks
> --steve
>  
>  
> 
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