ECU6 board

[C. Brooks]

I would recommend placing your filter as close to the components that
require the conditioned signal. The farther the filter is from the
components that rely on it the more potential for noise there is in the
line.

Filter theory can get complex pretty rapidly. Most applications don't
require more than 24 dB of attenuation by the filter and do not have phase
noise or accuracy requirements so most of the complex stuff can be thrown
out.

One of the best works on filters (And op-amps) is "The Active Filter
Cookbook" It will lead you through all the math and theory and have you
building filters from a handful of components in less than an hour. I've
used this book for designing signal conditioning "Boxes" for data
acquisition stuff for a couple years and before that I made my own audio
crossovers and walkman amplifiers with it :)

You'll have more fun with that one book than a whole semester on filter
theory <Blech!>

Charles Brooks
Mid-Atlantic Speed Shop
http://www.massmotorsports.com



----- Original Message -----
From: Al Lipper <efi at cardozo.org>
To: Daniel <duagu at hotmail.com>; EFI <diy_efi at efi332.eng.ohio-state.edu>
Sent: Monday, February 21, 2000 12:50 PM
Subject: RE: ECU6 board


> Daniel,
>     To be honest, I'm struggling with electrical filtering theory myself,
so
> perhaps someone else could answer thet.
>
>             Al
>   -----Original Message-----
>   From: Daniel [mailto:duagu at hotmail.com]
>   Sent: Wednesday, February 16, 2000 8:27 PM
>   To: Al Lipper
>   Subject: Re: ECU6 board
>
>
>   sorry to ask why but i am a bit slow on that, i know that the ignition
> coil would produces spikes in the electrical circuitry but i assumed that
> the filtering should be done before the supply goes into the ecu board.
>   Daniel
>     ----- Original Message -----
>     From: Al Lipper
>     To: Daniel
>     Sent: Thursday, February 17, 2000 1:46 AM
>     Subject: RE: ECU6 board
>
>
>     Try a 470uf electrolytic cap. between ign. coil positive and gnd.
>
>     Al
>
>       -----Original Message-----
>       From: Daniel [mailto:duagu at hotmail.com]
>       Sent: Wednesday, February 16, 2000 5:42 PM
>       To: Al Lipper
>       Subject: Re: ECU6 board
>
>
>       Hi Al,
>       thanks for the advice, I think i will place a capacitor in parallel
> between the battery and the ecu board, probably use one of the spare
> capacitors i have lying around, maybe 10uF.
>       Daniel
>         ----- Original Message -----
>         From: Al Lipper
>         To: Daniel ; EFI
>         Sent: Wednesday, February 16, 2000 4:52 AM
>         Subject: RE: ECU6 board
>
>
>         Daniel,
>             I work for California Polytechnic State University.  Apart
from
> that, our EFI company is Injection Logic (www.injectionlogic.com) and
> focuses on selling custom EFI system designs.  ECU6 and ECU7 are the
result
> of the research from the products we market.  I believe that cooperation
is
> the greatest way to increase knowledge and promote development, so I have
> chosen to share most of the data on the systems we design.  The
proprietary
> information generally has to do with systems designed for a specific
> application.  Even so, I try my best to use what I've learned from that
work
> to help people with questions.  I'm very glad to hear of your progress
with
> ECU6.  One caution, unless your vehicle's electrical system is VERY
> noise-free, you will probably need some filtering on the power supply
input,
> or it may spontaneously reset (or report incorrect RPM, or fire the
> injectors when it shouldn't).  Good luck!
>
>
>                         Al
>
>         P.S. Thanks for the update.
>

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