Passive Audio Mixer W/ Channel Volume Control : 6 Steps - Instructables
Eddy Bergman.com: Synthesizer Build part-17: MIXER and PASSIVE ATTENUATOR in one.
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Results page 27, about 'passive stereo mixer'. Searching circuits at Next.gr
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operational amplifier - Simple audio mixer - Electrical Engineering Stack Exchange
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Circuit Diagram | Four Channel Audio Passive Stereo Mixer | Adafruit Learning System
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