u/HorsesFlyIntoBoxes

Followup to this schematic review request I posted several weeks ago. I went ahead and made suggested changes to the schematic before beginning pcb layout.

Description:

Protoboard with a bunch of jacks and pots for generating CV in the range of +/- 5V to be fed to the AD7606B ADC which then outputs to some pins that will be connected to whatever development board I'll be using for audio processing (right now it'll be a Nexys A7 FPGA board's PMOD pins).

The switches determine how the potentiometer and jack pairs will interact. One position will have the pot normalled to the jack input. The other position will have the jack CV sum to the pot CV. This was done for flexibility in prototyping different CV input behaviors.

All CV signals are fed to the ADC, which is configured to work in hardware mode with a serial SPI interface. ADC datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ad7606b.pdf

Layout (in case image captions don't show up:
Front layer: analog signals, adc, ground pour.
In1: Ground plane
In2: power layer. +3V3 pour below the digital side of the adc, +12V and -12V pours, thick traces to route +5V and -5V across the board.
Bottom layer: digital SPI lines, +12V/-12V power bus, ground pour.

This is my first every PCB. I've learned a lot doing this.