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G'day.I use a Peltor FM120 Rally Intercom.
http://peltorcomms.3m.com/world/Product.asp?PageNumber=924&Product_Id=294&ProductCategory_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
 

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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.
 
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