LM1815; distributor hall sender sensing

[Peter Florance]

I can't remember if Hall's have a bias that shows up at the output but the
cap is probably the best way to insure the zero cross.
You're probably not going to get the  same shape as the magnetic sensor, but
good enough to use, yes is my guess.

Peter Florance
81 euro 528i w/ 3.5L


> -----Original Message-----
> From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
> Behalf Of Rich M
> Sent: Monday, December 10, 2001 6:37 PM
> To: diy_efi at diy-efi.org
> Subject: RE: LM1815; distributor hall sender sensing
>
>
> Steve,
> It could be that the input signal from the hall effect does not
> reach zero.
> Hall effect outputs often swing between two voltage levels which are both
> above ground. LM1815 requires that the input at least reaches 0V,
> preferably
> going negative. You could try capacitive coupling of the input
> signal to get
> a zero crossing signal.
> Cheers
> Rich
>
> > -----Original Message-----
> > From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
> > Behalf Of Stephen Webb
> > Sent: 10 December 2001 22:52
> > To: diy_efi at diy-efi.org
> > Subject: LM1815; distributor hall sender sensing
> >
> >
> >
> > I have an LM1815 "variable reluctance sensor amplifier" IC, which I
> > believe is appropriate for my application.  I am trying to use
> it to sense
> > the ignition pulses from a Bosch hall sender distributor.
> >
> > I prototyped the suggested circuit, but was unable to get any meaningful
> > output from it.  Does anyone have any experience with these
> ICs, and if so
> > are there any pitfalls that I might be in right now?  (I either get
> > seemingly uncorrelated triggers at a very high rate, or no triggering at
> > all)
> >
> > Does the ground reference for the IC have to be the same as the
> one going
> > into the distributor?
> >
> > TIA
> >
> > -Steve
> >
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