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I figured out this circuit when a friend of mine was asking how to connect 2 microphones into a single channel small audio mixer (behringer Small Mixer). Basically what the circuit does is to combine both microphone signal (unbalanced input) and feed them into single (unbalanced) output. I’m not sure whether this will work and whether it is necessary to join A and B with 10K resistor (will it short circuit the output?) but, hey, you can only know when you try them. Guess what? Yes or No. In actual fact, it doesn't short circuit, the circuit has been tested and currently in used at the Government Radio Station.
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