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This is a fork from the OSSI (Open Source Solar Inverter)
version: https://github.com/transistorgrab/OSSI/commit/550c74a30d7218419b5833ab65b47040ee92fb3c
created by: https://github.com/transistorgrab
Building this circuit to understand how audio op-amps work, why each component and value was selected, and determining the gain control and filtering for optimal sound control and volume.