DIY-WB PCB LAYOUT ERROR!!!

[Bill Shaw]

Oops, I was looking at R38. I was surprised it was working so well with the grounds 'screwed up' like that!

And THAT,  Peter,  is why I try not to speak in absolutes.  But when you can't be heard over the noise,  what's a guy to do but  try to shout over top of it?

Back to your regularly scheduled bickering....

bs

> Date: Mon, 10 Dec 2001 15:04:56 -0500
> From: Steve.Flanagan at VerizonWireless.com
> Subject: RE: DIY-WB PCB LAYOUT ERROR!!!
>
> Bill,
>
> The one I built works fine, did not require any changes to make it work.
>
> However, I had to configure mine to interface to a data recorder on our drag
> car.
> The data recorder only has a 5V capability, so I could not power the WBO2
> UEGO part of
> the board from my data recorder.
>
> I had to power both the Heater and the UEGO circuits from the same source.
> This
> means that I also needed to tie the two grounds together.
>
> J4 should be connected to J12 and should be GND in my case.  Until I
> connected J12 to gnd I could not get the board to work either.
>
> The board is fine.
>
> Steve
>
> - -----Original Message-----
> From: w.shawsr at att.net [mailto:w.shawsr at att.net]
> Sent: Monday, December 10, 2001 1:17 PM
> To: diy_efi at diy-efi.org
> Subject: DIY-WB PCB LAYOUT ERROR!!!
>
> Wow,  the only one who responded to my previous email was
> Peter,  and he was so far off base I'd guess he didn't
> read my post completely.
>
> GUYS....THERE IS AN ERROR IN THE DIY-WB PCB LAYOUT!!!
>
> Could someone pick up an ohmmeter and verify this?  Maybe
> even report back to the list???
>
> My previous post stated:
>
> I finally powered up my board and I've been poking around
> with a meter for an hour or so now.  Things don't seem quite
> right.  Maybe someone could shed some light?
>
> The schematic and the PCB don't seem to agree on Vgnd.  The
> schematic shows the junction of R37 and C11 as being Vgnd
> but that trace on the PCB connects to the output of the 8
> volt regulator according to my ohmmeter,  which would make
> that point +4V wrt Vgnd.  Whatsupwiddat?
>
> Bill

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