12.05.2014 Views

Automating Manufacturing Systems - Process Control and ...

Automating Manufacturing Systems - Process Control and ...

Automating Manufacturing Systems - Process Control and ...

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

continuous sensors - 23.34<br />

The circuit in Figure 23.34 will convert a differential (double ended) signal to a<br />

single ended signal. The two input op-amps are used as unity gain followers, to create a<br />

high input impedance. The following amplifier amplifies the voltage difference.<br />

-<br />

+<br />

Vin<br />

-<br />

+<br />

Vout<br />

-<br />

+<br />

CMRR<br />

adjust<br />

Figure 23.34<br />

A Differential Input to Single Ended Output Amplifier<br />

The Wheatstone bridge can be used to convert a resistance to a voltage output, as<br />

shown in Figure 23.35. If the resistor values are all made the same (<strong>and</strong> close to the value<br />

of R3) then the equation can be simplified.<br />

www.PA<strong>Control</strong>.com

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!