DATV repeater audio switch
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The 8 channel input audio switch was designed to meet the needs of the GB3SQ TV repeater.
It is controlled by i2c and is supported in the BATC repeater controller. i2c commands are listed in the MCP23089datasheet here.
It can be configured as an 8 channel mixer with two outputs or as two 4 channel mixers with one output each. Also an unused input can be populated to be a high current open-drain output. The 8 switch elements are addressed via I2C.
Schematics and BOM
Schematic: media:REPEATER I2C Audio Switch V2022 SCH.pdf
Silk screen: File:REPEATER I2C Audio Switch V2022 SS.pdf
Parts list: File:REPEATER I2C AUDIO SWITCH PARTS V2022.xlsx