Op Amp 101

[swagaero]

Joe Boucher wrote:
>=20
> This M.E. is doing a miserable job of learning about Op Amps.  I
> understand the fundamentals now of what one is and what it does, I'm no=
t
> completely clear what is the goal.
>
Gain or lack of gain

=20
> The GM MAP sensor takes a 5 volt reference signal and alters the signal
> as the manifold pressure changes. (Right?) Whether absolute vacuum or
> atmospheric is 5 volts escapes me and not important to this discussion,
> yet.
>=20
> As mentioned earlier today or yesterday, a family sedan will develop
> around 18 mm hg at idle and maybe 20 to 22 mm hg at cruise and then 0 a=
t
> full throttle.
>=20
> My Camaro develops around 10 mm hg on a good day and maybe 18 to 20 at
> slower cruise speeds.  It will also  develop much wilder pulsation=92s =
at
> idle than a family sedan.  The engine doesn't really smooth out till
> about 2250 rpms.  The power band starts around 2750.
>=20
> The question of the post is:
> Is the purpose of the op amp to filter the wild fluctuations at idle in
> the reference signal because of the cam overlap, or is the purpose to
> bend the vacuum signal of the wild camshaft to mimic the family sedan
> vacuum curve, or both?
=20

take the weak signal from a high overlap cam and bring it up to where
the ECM expects it to be. Set the low end and set the high end and
everthing in the middle works.=20


> I have pulled a Tom Sawyer and hooked on of the avionics engineers here
> at work in to helping me if I can determine the parameters of the
> design.
>=20
> By the way, Steve, if this is in one of your books, I'll buy it.  If
> it's not in a book why don't you write one and I'll buy that one.  I
> perfectly understand this is your proprietary info, and I am willing to
> compensate you in some way, if you can figure out how you want to do it=
,
> within reason.  I ain't made of money or I would buy an Edelbrock
> system. =20

Tell me bout that

I am trying to determin if I can release the info.


Steve
>=20
> Joe Boucher
> '70 Camaro  '81 TBI Suburban

--=20

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