Re: Signal generator for ecm bench

["nacelp" <nacelp@bright.net>]

Transformer, geez, you'll never know how much sleep I lost over a reluctor
simulator trying to get an A/C signal from a 2732,
1K coupling should be what I want.
THANKS
Grumpy


> Scott,
> For some reason, I didn't see your original message, just
> this reply from Don. I have set up two 555 timers for my
> test bench. One for VSS, and one for RPM. I had it all
> working with a signal generator, and just put the timer
> circuit together to replace the Lab Equipment. The one
> sneaky thing is that the VSS signal into the PCM is a
> differential signal. I used a small audio transformer to
> isolate the 555, and create a differential signal.
>
> There is a lot of info on the WEB on 555 timer circuits. I
> can send you the values we used if you want them.
>
> Ken
>
> Don.F.Broadus@ucm.com wrote:
> >
> > I have the engineer's mini notebook on 555 timer circuits  (cat no.
62-5010)
> > in front of me, I could fax you the contents if you would like.
> >                Don
> >
> > > -----Original Message-----
> > > From: Scott Knight [SMTP:scott@scottknight.com]
> > > Sent: Thursday, March 09, 2000 6:49 AM
> > > To:   gmecm@diy-efi.org; diy_efi@diy-efi.org
> > > Subject:      Signal generator for ecm bench
> > >
> > > Now that I am working on an ecm bench to test a few things with regard
> > > to running two controllers in parallel (LT1 PCM and SEFI8LO), I need a
> > > function generator to give me things like crank and vss signals.
After
> > > a couple hours in the message archives I decided to make a run to
Radio
> > > Shack to find a book to get the 555 Timer IC Circuits book.  This
looks
> > > to have the circuit(s) I need to build, but wouldn't you know, all of
> > > the stores in my district don't have it (this is what the local store
> > > manager told me after searching her computer).  So, instead of driving
> > > all over the west end of PA to get a $2 book, I wonder if anyone has a
> > > schematic that would be useful to me instead.  Being an ME, I have
> > > limited EE capabilities, but at least can read schematics fairly well.
> > > Building is not a problem...designing and understanding are.
> > >
> > > Thanks.
> > > --
> > > Scott Knight  mailto:scott@scottknight.com
> > > http://www.scottknight.com/ IRC:SS396man
> > > '95 Black Impala SS
> > > '94 Ducati 900SS CR
> >
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