Peltor Intercom help.
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Thread: Peltor Intercom help.

  1. #1
    100 K left 2
    Join Date
    May 2015
    Location
    Brisbane, Australia
    Posts
    9

    Default Peltor Intercom help.

    G'day.I use a Peltor FM120 Rally Intercom.
    http://peltorcomms.3m.com/world/Prod...Category_Id=28
    I also use an AEE ActionCam SD21.
    http://en.aee.com/Action/Inform.aspx?id=10000046 Search SD21 Outdoor version.

    The AEE Action Camera has 2.5mm jack for recording with an electret external microphone, so the AEE tech support advised.
    I have tried RCA aux out on the Peltor to 2.5mm stereo jack but have had no success.
    Is the RCA Aux output too high a voltage?
    Any thoughts?
    Cheers
    Ross
    Guy Martin, TT rider was asked if he was happy with the amount of practice at the TT in 2015.
    His answer was "There are no trophies for practice, are there"

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  3. #2
    pressing on tirelessly
    Join Date
    Nov 2002
    Location
    San Jose, CA.
    Posts
    2,225

    Default

    Almost assuredly. An electret mic puts out microvolts, and aux level is usually around .3v.

    Simplest thing is to try a voltage divider. You can play with the values of the values of the resistors a little to get the level right if it's close.

    Code:
    Peltor o--------+
                    |
               R1 <10K>
                    |
                    +----------------o    camera
                    |
               R2 <120>
                    |
       GND o--------+----------------o    GND
    Don't play with R2 too much. Lowering R1 will increase the voltage to the camera making things louder. You can maybe try a 4.7K there or go up to 15-20K if it's too loud.

    If you try it, please report back with your findings.
    Last edited by hoche; 08-18-2015 at 10:37 PM. Reason: Added more info about resistor choices.

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