Difference between revisions of "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. | The 8 channel input audio switch was designed to meet the needs of the GB3SQ TV repeater. | ||
Revision as of 09:41, 17 February 2022
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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 by 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
Note: There are alternative parts for the pots. They have different rotations. Before submitting the parts list choose the pot and between Molex and screw terminals.
CT6ER103-ND is inserted with the wiper in the square pad, the others go 180° opposite