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Thread: E-Mag

  1. #1


    I have an 0-360 built by Mattituck in my RV-7
    The engine has a Lightspeed Plasma II and a Slick impulse mag.
    My AF-2500 gets the Tach signal from the Slick magneto.

    The Slick is nearing 500 Hrs and I am planning to replace it with an E-Mag.
    Can I use the Tach signal from the E-Mag connector #6?

    New Zealand

  2. #2
    Advanced Flight Systems Shawn McGinnis's Avatar
    Join Date
    Sep 2012
    Canby, OR
    It should work if you use a 5V signal level. Otherwise you might need to modify the analog module to accept higher voltage pulses. You will also need to change the Pulses per revolution in the calibration.
    Shawn McGinnis

    Advanced Flight Systems

  3. #3
    Thanks Shawn
    The E-Mag installation manual says the tach output on connector #6 is two 10v pulses per revolution.
    Connecting a diode (presumably a 5V zener) from the tach output to ground drops the voltage to 5V.
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    The AF-2500 RPM would be changed in calibration for four pulses per two revolutions.
    If I connect the E-Mag tach output directly to the RPM input on the AF-2500 with the zener diode to "common" would this be OK?
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    Last edited by Jim Talbot; 09-17-2020 at 03:46 PM.

  4. #4
    Wire it exactly like the PMAG manual, connect both ends of the diode to the PMAG.
    Rob Hickman
    Advanced Flight Systems Inc.

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