DIY_EFI Digest V5 #385

[Mike Martone]

hmmm... a 7805 on an LM324 (or 124 if ya want milspec) will only drive the
opamp to a rail of about 4.75V... the 7805 is typically 4.95 on the output
and ya won't see any more than that at the opamp's outputs... maybe a 7809?
if you're really worried about driving too much into the 324 (which is way
below the 38V SE or +/-18V bipolar before it fries value), throw a trimpot
on the output of the regulator and adjust it to whatever suits ya......by
the way... anybody know why they put a mirror behind the movement of a
micronta VOM?

have fun,
meat head
----- Original Message -----
From: Barry Tisdale <btisdale at cybersol.com>
To: <diy_efi at diy-efi.org>
Sent: Wednesday, November 15, 2000 12:24 PM
Subject: Re: DIY_EFI Digest V5 #385


> Thanks for the truly definitive answer, Chad.  There's bound to be more as
> this project progresses.
>
> Barry
>
> At 10:22 AM 11/15/2000 -0600, Chad Clendening wrote:
> >1) The regulator really needs to be a 8 volt variety.  Even with a good
op
> amp,
> >the 5 volt regulator didn't have enough headroom.  The V+2.5 and -2.5 are
> not the
> >actual voltages present.  It was more like v+3 and v-5
> >The artificial ground isn't evenly split since more negative current is
> needed
> >than positive current.
> >
> >2) The early data was taken with a earlier prototype and the I to V amp
> was wired
> >differantly.  It was taken as a meter was laying around doing nothing.
> >
> >Chad
>
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