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How to scale AnalogeOut from 0-3.3V to 0-10V ?

Topic last updated 31 Jan 2017, by Nicolas Nackel. 1 reply
Benjamin Dammert
30 Jan 2017

Hello to the forum! (I´m beginner in microcontrollers and from Germany, so sorry for bad english :-)

Application: My application is a active vibration damping and I want to run a PID Controller on LPC1768. The analoge input would be the acceleration and the analoge output is the signal to piezoactor amplifier.

Problem: The piezoactor amplifier needs an input from 0-10V. The Aout (p18) provides only 0-3.3V.

What I´ve found in the forum so far: https://developer.mbed.org/users/AjK/notebook/scaling-mbeds-aout/ https://developer.mbed.org/users/eqon/notebook/industrial-io-board-mbed/

Question: Has anyone experience in creating a 0-10V Aout or know how to do it?

Nicolas Nackel
31 Jan 2017

Ben,

Welcome! You probably need a non-inverting amplifier.

https://en.wikipedia.org/wiki/Operational_amplifier_applications#Non-inverting_amplifier

You will also need an external power supply of at least 10V - probably 12V would be convenient.