X9420

FN8195 Rev.1.00

Page 17 of 19

April 26, 2006

APPLICATIONS INFORMATION

Electronic potentiometers provide three powerful application advantages: (1) the variability and reliability of a solid-

state potentiometer, (2) the flexibility of computer-based digital controls, and (3) the retentivity of nonvolatile memory

used for the storage of multiple potentiometer settings or data.

Basic Configurations of Electronic Potentiometers

Basic Circuits

I

Three terminal Potentiometer;

Variable voltage divider

Two terminal Variable Resistor;

Variable current

Noninverting Amplifier

Voltage Regulator

Offset Voltage Adjustment

Comparator with Hysterisis

+

–

317

+

–

100k



10k



10k



10k



-12V

+12V

TL072

+

–

+5V

-5V

LM308A

Cascading Techniques

Buffered Reference Voltage

–

+

+5V

+V

-5V

OP-07

+V

+V

+V

X

(a)

(b)