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audio - DIY mixer - use diodes to prevent input potentiometers influencing each other - Electrical Engineering Stack Exchange
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Stereo Mixer, DIY Amplifier to Headphone Sound Selector Switch On PC for Speaker : Amazon.ca: Electronics
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Amazon.com: Stereo AUX Mini Jack 3.5 mm Audio Mixer 4 Input to 1 Output Individually Controls Board Sound Mixing DIY Headphones Amplifier : Electronics
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