Simple Active Mixer on sinlge voltage

  
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It`ll work on single supply. I`ve used it when I ran my lunetta on a 9 volt battery for a while and it`s still loud and proud running on my new regulated 5 volt wallwart. If you want one with input gains (to plug in guitars or mics), I made a modified version, also with power regulation to run off of a wall wart without humming. If you don`t need that and just want to run on a 9v battery, then omit the
Simple Active Mixer on sinlge voltage - schematic

LM317 and caps/resistors connected to it, and hook the + of the battery to the line where the four 10k resistors are, and negative terminal to the bottom line, which is ground:



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