Signal generator for ecm bench

[Ken Kelly]

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 at 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 at scottknight.com]
> > Sent: Thursday, March 09, 2000 6:49 AM
> > To:   gmecm at diy-efi.org; diy_efi at 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 at scottknight.com
> > http://www.scottknight.com/ IRC:SS396man
> > '95 Black Impala SS
> > '94 Ducati 900SS CR
> > --------------------------------------------------------------------------
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