That is just very simple mixer circuit. There are lots of tutorials out there and will only take very few minutes for you to figure out how to make its pcb layout.
you can also try this one:
Simple Mic Mixer – tataylino.com
a little more complex than what you posted but it does the job. it also has simulation file for you to download so you can play with it.
you can also try this one:
Simple Mic Mixer – tataylino.com
a little more complex than what you posted but it does the job. it also has simulation file for you to download so you can play with it.
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