X9428
APPLICATIONS INFORMATION
Basic Configurations of Electronic Potentiometers
V
R
+V
R
V
W
/R
W
I
Three terminal Potentiometer;
Variable voltage divider
Two terminal Variable Resistor;
Variable current
Application Circuits
Noninverting Amplifier
V
S
+
–
V
O
V
IN
317
R
1
R
2
R
1
I
adj
R
2
V
O
(REG)
Voltage Regulator
V
O
= (1+R
2
/R
1
)V
S
V
O
(REG) = 1.25V (1+R
2
/R
1
)+I
adj
R
2
Offset Voltage Adjustment
R
1
V
S
100kΩ
–
+
TL072
10kΩ
10kΩ
+12V
10kΩ
-12V
V
O
R
2
Comparator with Hysteresis
V
S
–
+
V
O
V
UL
= {R
1
/(R
1
+R
2
)} V
O
(max)
V
LL
= {R
1
/(R
1
+R
2
)} V
O
(min)
}
R
1
}
R
2
18
FN8197.1
April 26, 2006