# Amplify 0 - 3.3V DAC signal to 0 - 10V

I have a 0-3.3V output that I wish to amplify to 0-10V.

I am using an 8-bit R2R resistor ladder connected to a National Instruments USB-6501 digital I/O device.

The application is to control a linear actuator via a controller that requires a 0-10V command signal therefore I need to amplify the output from the resistor ladder.

Would be grateful for any advice on how this can be achieved, thank you.

One approach is to use a non-inverting amplifier at the end of the DAC output, supplied by atleast 10 volts.

The DAC output in this case will be $V_{in}$

$V_o = V_{in}( 1 + R_1/R_2)$

Lets say we want $V_o = 10V$ , when $V_{in}= 3.3V$

$10 = 3.3(1+R_1/R_2)$

$10/3.3-1 = 2.0303 = R_1/R_2$

So one way to go at it , is make a non-inverting amplifier with a gain of roughly 2, by using 2Kohm for feedback resistor $R_1$ and 1Kohm for the other resistor $R_2$

8-bit resolution means the range is 255 discrete voltages. So 10V/255 bits = $39.2mV$/ bit

• That'd be 39.2mV per bit Aug 7, 2013 at 11:37
• Thanks for the advice echad and Andy aka, could you recommend an op-amp IC, from googling this type of solution, the 741 is both recommended and dismissed (not able to operate at 0-3.3V) so not sure which to go with, thanks. Newbie Aug 7, 2013 at 11:45
• It really depends on the application, how accurate you want it to be. You'll probably want to look for P/DIP package types (prototyping friendly). You can find them at places like digikey, mouser, newark or smaller stores like Sparkfun Aug 7, 2013 at 11:50