DIY-WB PCB LAYOUT ERROR!!!

[Steve.Flanagan at VerizonWireless.com]

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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