EL5152, EL5153, EL5252, EL5455

FN7385 Rev 6.00

Page 13 of 16

March 2, 2009

Strain Gauge

The strain gauge is an ideal application to take advantage of

the moderate bandwidth and high accuracy of the EL5152. The

operation of the circuit is very straight forward. As the strain

variable component resistor in the balanced bridge is

subjected to increasing strain its resistance changes resulting

in an imbalance in the bridge. A voltage variation from the

referenced high accuracy source is generated and translated

to the difference amplifier through the buffer stage. This

voltage difference as a function of the strain is converted into

an output voltage.

+

-

5V

V2

22

R17

1k

1k

RF

5V

V4

RL

1k

1

3

2

V+

V-

4

U1A

22

11

R18

1k

1k

R15

V5

1k

0V

VARIABLE SUBJECT TO STRAIN

R16

1k

R14

4

4

1n

L4

10µH

C6

1n

C3

R5

1k

1k

1n

C12

1n

C11

R11

1k

L1

10µH