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Simple two line output combiner - Audio | Video | Circuits
https://www.epanorama.net/circuits/linesum.html#:~:text=Building%20the%20circuit%20To%20build%20this%20circuit%20you,from%20inputs%20together%20to%20from%20one%20output%20signal.
How to build an audio mixer - Electronic Circuits
https://www.circuitlib.com/index.php/tutorials/product/39-how-to-build-an-audio-mixer
Naively mixing two (or perhaps more) audio signals ...
https://electronics.stackexchange.com/questions/103435/naively-mixing-two-or-perhaps-more-audio-signals
This circuit provides an output signal voltage according to the following equation: $$V_{out} = -R_4(\frac{V_1}{R_1} + \frac{V_2}{R_2} + \frac{V_3}{R_3}+ ...) = -(V_1 + V_2 + V_3)$$ The equation simplifies nicely in this case since all of the resistor values are equal, but you can easily change the values to set fixed gains for the channels. Additionally you can add quite a few more …
Making an Audio Mixer : 20 Steps (with Pictures ...
https://www.instructables.com/Making-an-Audio-Mixer/
A stereo signal is two channels (left and right) which are actually two separate audio signals with a shared ground. If we want to combine two stereo signals into one, we will need to mix together the left channel of each stereo signal, and the right channel of each signal. The easiest way to do this is to combine them together using resistors.
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