[Diy_efi] WB testing problems MORE!!!

[bill.shurvinton at nokia.com]

Interestingly I am getting the same problems, but I built my WB with =
parts scrounged from work, so that may be my problem.

I'm going to do some component replacement tonight to try and find out =
what will cure it.

Bill

-----Original Message-----
From: ext bcroe at juno.com [mailto:bcroe at juno.com]
Sent: Tuesday, April 23, 2002 6:26 AM
To: Diy_efi at diy-efi.org; RRauscher at nni.com
Cc: SAndersen at advan-tek.com; bcroe at juno.com
Subject: [Diy_efi] WB testing problems MORE!!!


Steve,=20

The board would probably work with the cap out or a=20
smaller value. =20

I'm sorry if not clear before, any electrolytic capacitor is
going to have leakage.  Tantalum too, just less.  But a=20
paper/film cap should have negligible leakage.  Such=20
caps are common up to 0.1 ufd, I'd try something like=20
that to see if the problem is cured.  If the 0.1 causes=20
a shift in voltage, its an indication there is some=20
AC voltage present which takes a scope to read.

Values up to .47 ufd or 1 ufd are less common but=20
available.  Putting several of these in parallel to get 1=20
or 2 ufd should be adequate for the job. =20

I never saw a non polarized electrolytic that small, are=20
you sure?

Bruce Roe

On Mon, 22 Apr 2002 21:14:37 -0400 Stephen Andersen
<SAndersen at advan-tek.com> writes:
> Just replaced C12 with a 2.2ufd non-polarized electrolytic
> tonight and it had NO effect. =20
>=20
> I have not tried to alter R38 yet, but I dunno what to=20
> do.  I need to get this thing working!!!
>=20
> Any more ideas?  Should I try the tantalum caps
> or something else?  Voltage is near ideal with the=20
> cap out of the circuit.
>=20
> Someone help me get the smoke back into the wires!!!
>=20
> Steve
>=20
> > -----Original Message-----
> > From: diy_efi-admin at diy-efi.org=20
> [mailto:diy_efi-admin at diy-efi.org]On
> > Behalf Of bcroe at juno.com
> > Sent: Saturday, April 20, 2002 4:02 AM
> > To: Stephen Andersen; bcroe at juno.com
> > Cc: diy_efi at diy-efi.org; RRauscher at nni.com; bcroe at juno.com
> > Subject: [Diy_efi] WB testing problems
> >=20
> >=20
> > Since the source of the problem is C12 leakage, you=20
> > could get rid of the leakage.  First make sure C12 is=20
> > correctly polarized in the circuit.  You could get a more=20
> > expensive tantalum cap of about that value.  To eliminate
> > the leakage completely get some non polarized caps.
> > 2 or 3 caps in parallel of 1 ufd each should do it.
> >=20
> > Bruce Roe

_______________________________________________
Diy_efi mailing list
Diy_efi at diy-efi.org
http://www.diy-efi.org/mailman/listinfo/diy_efi

_______________________________________________
Diy_efi mailing list
Diy_efi at diy-efi.org
http://www.diy-efi.org/mailman/listinfo/diy_efi