DATV repeater audio switch

Back to repeater controller main page

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. The 8 switch elements are addressed via I2C.

Schematics and BOM

Schematic: media:REPEATER I2C Audio Switch V2022 SCH.pdf

Parts list: File:REPEATER I2C AUDIO SWITCH PARTS V2022.xlsx

Notes

• 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

• This PCB uses tantalum capacitors - the bar on the case indicates +ve and not - ve as it does on some electrolytic capacitors.