LM1815; distributor hall sender sensing

[Rich M]

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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