linux computer + DAC + aop + driver

Hi

I want to pilot a laser with a linux computer and with galvanometers bought on ebay (25 k galvo scanner). I had to add a DAC MCP4822 to have output between 0 and 5V and I made the assembly below to have output between ~-5V and ~+5V

http://laserpointerforums.com/attac...6-arduino-dac-xy-projector-correction-amp.png

When I connect the ouput to the driver nothing happens when I change the voltage :-(

Thanks for any hint

Karim

On the driver board there is the pins : - GND and + but only two of them seem connected.
I do not connect the ground to the driver only ilda- and ilda+ (see schematic in the previous post)

fixed
groun problem

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