Four-input stereo mixer

  
Four (or more) inputs can be mixed and produce stereo output. Gain of each stage can be boosted by adding RX, but it should be kept below 50 (RX above 2 K) to avoid poor frequency, response. If more than four stages are used, decrease RXto 6 K for six inputs, or 4 K for eight inputs
Four-input stereo mixer - schematic

The op amps are 741 or other lower noise types. The power supply circuit is also given.




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