Preamplifier mixer for 4 microphones. This device allows the amplification and maxing of signals coming from 4 fixed microphones to be applied to an audio power amplifier. Useful in case of small choirs, musical groups, etc. In repository are: wiring diagram, PCB in ExpressPCB and some photos. More to:https://www.instructables.com/id/4-Microphones-Mixer-Preamplifier/
StoicaT/4-Microphones-Mixer-Preamplifier-
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