user50158: I am currently building a project involving a laser scanner (two galvanometers with mirrors that deflect a laser beam) that I want to control. The galvos need +-10V differential signals (and I'd like to have a least 12Bit) that I want create with some small board. 
Most Arduinos I know use PWM to create an analog output which is not usable for this project. I found the Teensy3.1 which has at least one 12Bit DAC so that also doesn't work. An alternative would be a DAC breakout board like "MCP4725" but it would be nicer to just have a single board with no additional parts. 
The best thing would be a small board with already two 12Bit DACs. (even If I had to upscale the voltage +-10v)
Is there a board I haven't found so far? Or have I missed a completely different approach?

user4143: For 12-bit dual DAC you want the MCP4822 which has two channels of 0-4.095V in 1mV steps.
The output of that you would then need to pass through a suitable amplifier arrangement with an op-amp giving a gain of 5 and adding an offset of -10V.  The gain would change the 0-4.095V to 0-20.475V, and the -10V offset would change that to -10V to +10.475V.  If you want to get more precise you could use an offset of -10.2375V (it's not easy to make an offset voltage that precise) then you would get -10.2375V to 10.2375V in 12-bit resolution.
It's doubtful you'll find a board already made up with that specific arrangement (it's fairly specialised) but it's not something that's hard to make - all the components are available as DIP or other through hole components, and the circuit for the amplification stage is pretty simple (check for non-inverting op-amp circuits online, there's millions), so building it up on strip board or matrix board would be easy enough.

50158: <p>I am currently building a project involving a laser scanner (two galvanometers with mirrors that deflect a laser beam) that I want to control. The galvos need +-10V differential signals (and I'd like to have a least 12Bit) that I want create with some small board. </p>

<p>Most Arduinos I know use PWM to create an analog output which is not usable for this project. I found the Teensy3.1 which has at least one 12Bit DAC so that also doesn't work. An alternative would be a DAC breakout board like <a href="https://www.adafruit.com/products/935" rel="nofollow" title="MCP4725">"MCP4725"</a> but it would be nicer to just have a single board with no additional parts. </p>

<p>The best thing would be a small board with already two 12Bit DACs. (even If I had to upscale the voltage +-10v)</p>

<p>Is there a board I haven't found so far? Or have I missed a completely different approach?</p>
 4143: <p>For 12-bit dual DAC you want the <a href="http://ww1.microchip.com/downloads/en/DeviceDoc/22249A.pdf" rel="nofollow">MCP4822</a> which has two channels of 0-4.095V in 1mV steps.</p>

<p>The output of that you would then need to pass through a suitable amplifier arrangement with an op-amp giving a gain of 5 and adding an offset of -10V.  The gain would change the 0-4.095V to 0-20.475V, and the -10V offset would change that to -10V to +10.475V.  If you want to get more precise you could use an offset of -10.2375V (it's not easy to make an offset voltage that precise) then you would get -10.2375V to 10.2375V in 12-bit resolution.</p>

<p>It's doubtful you'll find a board already made up with that specific arrangement (it's fairly specialised) but it's not something that's hard to make - all the components are available as DIP or other through hole components, and the circuit for the amplification stage is pretty simple (check for non-inverting op-amp circuits online, there's millions), so building it up on strip board or matrix board would be easy enough.</p>
