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How do I combine multiple audio signals?

I'm trying to splice in the output from an mp3 player into the microphone of Xbox headset. I've had no luck simply inserting it into the circuit, is there something else involved?

Sincerely, Bean

Re-design1 year ago
look up audio mixer. There are passive ones that only use a resistor or two and active ones that use transistors, or other chips and resistors.
meanbean (author)  Re-design1 year ago
Was doing some research on my own, and some 5k resistors on both of the inputs got rid of the interference. Thanks anyways!
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