Main components

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Part NumberDescription
ATtiny202-SS20MHz, 2kB Flash, 128B SRAM, 64B EEPROM, SOIC-8
CH340EUSB serial converter, UART, MSOP-10
TS5A23159DGSDual SPDT 1ohm Bidirectional Analog Switch with Off protection, VSSOP-10

tx02 schematic

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tx02 board layout