Main components

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Part NumberDescription
TPS56124x
ATtiny402-SS20MHz, 4kB Flash, 256B SRAM, 128B EEPROM, SOIC-8
ATtiny1604-SS20MHz, 16kB Flash, 1kB SRAM, 256B EEPROM, SOIC-14
alps-rk10j12e
BQ25172

musicbox schematic

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musicbox board layout