Arduino DC Amplifier Help

[Logan Nichols]

Hello

I am currently working on a project whereby an output pin of the arduino needs to control the blacking out of shutter 3D glasses. I need to deliver ~9/10V to the shutter glasses to blacken them and then have them fade back to transparent. I have this mocked up using an LED for now, using the 5V output from the arduino.

My question regards boosting this 5V output to the required 10V, I am unsure of the best approach here. I will be using a 9V battery to power the arduino and have considered switching this to the glasses by using a MOSFET controlled by a digital pin. The downside with this is the output will be locked and I will not be able to fade the voltage out. I am also considering using a non inverting op amp however I am unsure whether the output current will be suitable.

Any ideas here would be super appreciated !

 

[Harald Kapp]

Use an analog output (filtered PWM) from the arduino as input to an inverting operational amplifier. Power the amplifier by an additional 9V battery, so it has dual +-9V supply. Set the amplifier's gain to ~1.8 to match the input 0V...5V to an output of 0V...-9V (note that for fully reaching -9V you'll have to use an operational amplifier with rail-to-rail output!).
Using only the 9V batttery that powers the arduino will not suffice as you lack the negative supply (-9V) for the LCd drive. You could, however, use a charge pump based voltage inverter to create -9V from +9V as the power requirements of the LCD are probably very low. That leaves you with a single battery plus some electronics (which you will need anyway for the opamp).