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Thread: 5V or 12V expected for RPM pulse from magneto?

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  1. #1
    Junior Member
    Join Date
    Jul 2015
    Location
    Palo Alto, CA
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    12

    5V or 12V expected for RPM pulse from magneto?

    Good morning AFS people!
    I have a Lycoming IO-390, dual Slick mags, and an AFS 5600. I am planning to replace the magnetos with two E-Mag electronic ignitions.
    My AFS-5600 currently gets its RPM data from the right mag (red, black, and white wires connected to the side of the mag housing, presumably to some kind of Hall effect sensor).
    The new E-mags can also supply an RPM signal, using the same white wire. The E-mags can be configured to provide this tach pulse at either 12V or 5V.
    Question: what voltage is the AFS-5600 expecting from the magneto tach pulse, 12V or 5V?
    Also: are there any known issues related to my EFIS when converting from Slick mags to E-Mags?
    Thanks,
    Bob
    Last edited by lisbonne; 02-20-2020 at 12:17 PM.

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