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Thread: Listening to two devices single headphones

  1. #1
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    Listening to two devices single headphones

    I've got an enduro race on in a month's time and am trying to work out how to listen to both the track's radio system and a way to keep in contact with the pit. I was looking at looking at getting a splitter to go both into the two radios and so I can hear both. I found this wiring Name:  wiring.gif
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Size:  8.8 KB to do it to prevent each radio from driving each other but am wondering why the needs to be the 20k resistor near the output?

  2. #2
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  3. #3
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    Where is the race?

    If at QR/Lakeside, the control radio receiver has pass through so you can just plug your pit radio into it and control comms
    override your pit radio.

    gh
    Radical SR3
    HSV R8

  4. #4
    Registered User aerobrick's Avatar
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    That schematic is for passive mixing balanced signals (+/-/ground), you'll likely be looking to mix unbalanced signals (+/ground). If it were me I'd just use a Y adapter and run source to one ear and one to the other.

    If "single headphones" means one ear only, put both signals through 100ohm resistors and a 1k pot wired as a variable resistor for added attenuation so you can mix the levels where your need them. Tie all 3 grounds. (Signal a, signal b, head phones)

  5. #5
    Bannered takai's Avatar
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    Ive used an off the shelf Behringer micromixer for this in the past: https://www.amazon.com/Behringer-Mic..._&dpSrc=detail

    Bonus was listening to Flight of the Valkyries as well :P
    Chris
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  6. #6
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    Thanks everyone for the reply. Looks like I'll use the pass through at it's the easiest.

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