[Diy_efi] GM tach RC filter

[bill.shurvinton at nokia.com]

Noise supression. Try 5-10Khz as a starter.

-----Original Message-----
From: ext Perry Harrington [mailto:pedward at apsoft.com]
Sent: 21 September 2002 23:24
To: diy_efi at diy-efi.org
Cc: efi332 at diy-efi.org
Subject: [Diy_efi] GM tach RC filter


Hi all,

I was looking through the schematic of my Corvette wiring harness and =
noticed
that GM uses a 2 section RC filter on the tach input.

I imagine there is a good reason they did this, and I wanted to =
experiment
with it for my own pursposes.

Does anyone know the values of the components in the filter?

I've seen an RCR tach filter schematic for the filter used on Fieros, =
but a
search didn't turn up the 2 section RC filter that is used in the Vette.

Any information would be greatly appreciated.

Thanks,

--Perry

--=20
Perry Harrington			Data Acquisition & Instrumentation, Inc=09
perry at dainst dot com					 http://www.dainst.com/

Those who would give up essential liberty to purchase a little temporary =
safety
deserve neither liberty or safety. Nor, are they likely to end up with =
either.
                             -- Benjamin Franklin

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