DIY WB done, may not be working right (probably)

[Jess Gypin]

Thanks for the help guys. The doide was in backwards takes a few seconds to
heat and then the led comes on and the Vout is about 3.8 volts. Very cool!
Now to test it in the car.

Jess
----- Original Message -----
From: "Scot Sealander" <Sealand at clarityconnect.com>
To: <diy_efi at diy-efi.org>
Sent: Friday, October 26, 2001 21:15 PM
Subject: Re: DIY WB done, may not be working right (probably)


> Jess Gypin wrote:
>
> > I have finished the DIY WB using the group board and suggestions. Just
fired
> > it up on the bench tonight. No smoke. I have measured the output from
the
> > Vout with a digital multi meter and all I am seeing is 2.49 volts.
Heater
> > seems to be working as the sensor gets very hot. The heater LED never
comes
> > on. The output voltage does not seem to change much at all. I was
expecting
> > about 4 volts free air. Can anyone point me in the right direction? Does
the
> > LED have to turn on for the measurement circuit to fire up? I wonder if
the
> > LED is backwards.....Hmmmmmm.
>
> A couple things you need to check.  What voltage is the circuit running
> on?  You need a minimum of about 13 volts to get the heater circuit to
> go into voltage regulation mode from current limiting mode.  Yes, you
> will get 2.5 volts on the output if it stays in current mode.  The LED
> does need to be in correctly to get to the sensor part of the circuit to
> function.
>
> There may be a lot of questions like this, so it may be a good idea if
> we get a list of proper voltages at various parts of the circuitry.
>
> Scot Sealander
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