Hi,
you need to supply the mainboard with +/- 15V for the analog section (if DAC or ADC modules are used) and +3V3 for the digital section.
From the 15V the board generates the +5V and the +3V3 for the analog section via regulator circuits on the mainboard.
The other features are:
- voltage monitor for reset circuit during power-up
- several pin headers for auxiliary circuits (like XLRs, level meter etc.)
- bus interface if you want to connect several mainboards together in order to build a bigger setup
- D25 connectors for i/o
- several LEDs for status display
- galvanic isolation of analog and digital section, e.g. you use two mainboards to build an 8 channel DAC with AES input and galvanic isolation between the AES input circuit and the DAC stage (recommend). But you can also stack the DAC and the AES input modules on one mainboard to get an 8 channel DAC without galvanic isolation
- the businterface can be configured for both directions for the data lines
- galvanic isolated I2C interface (if you want to control the ADCs/DACs via a microcontroller or for new modules in the future)
- the mainboard does support either I2S or TDM format for the internal digital audio stream
Raphael