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backplane for prototype 1

A project log for Multichannel Audio DSP Field Mixer Recorder

USBmidi, bluetooth app controll 8 chan portable DSP mixer.balanced audio IO,phantom power,flexible routing,ISO recording. networked Timecode

ben bilesben biles 04/27/2018 at 17:210 Comments

The backplane is in and after adding 2 bodge wires ( had 2 serial traces the wrong away around ! ) it works

The next version will have the upgraded ADAU1467 DSP and the design will be even more modular.
the backplane will have an the STM32f7 and ADAU1467 and all other cards will be slotted in !
Hopefully all the sockets will be PCB mounted to! I really want to loose this box full of wires and
connectors :)

This back-plane has 4 differential preamp channels and 4 differential transformer style outputs with 1 high quality

headphone driver plugged in.

The ADC DSP DAC 8 chan board is hidden under the ARM dev board and has a nest of jumper wires connecting up the I2C TDM audio UART Bluetooth 4.0 etc. the Bluetooth module is gaffer taped in there somewhere !

It sounds very noise free and better than my sound devices 633 mixer ! BUT i'm not even going to compare them until

revision 2 since these wires are all over the place :)

Also if you read that far back rev 1 of the ADC DSP DAC still doesn't have ground planes since I did'nt know how to make them

back then!

I'm still working on the TDM8 ARM recorder/playback app and will post some test WAV poly files here when I get that working properly.

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