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.
APPLICATIONS
(conHnued)
5.7
A COMPARATOR
USING
THE
OPERATIONAL
AMPLIFIER
Connect
the
operational amplifier
as
shown
below:-
Note:
V
ref
can
be obtained
from the
Function
Generator by
turning the
Amplitude
control
to
zero
and
using
the
D.C.
offset
to
provide
a
±
5V
D.C.
output
at
the
0-1
OV
terminal.
Vary
the
output
of the
Bi-Polar
Power Supply and
simultaneously monitor the
output
of the
Operational
Amplifier.
It
can be
seen
that
if
the
value of
Ein
is
less
than
V
ref
the output
will
be negative, and
if
Ein
is
greater than
V
ref
the output
will
be
/'o^/tive.
The value
of
V
ref
can
lie
anywhere between
±10V.
Ein
and
V
ref
can be
reversed
resulting in polarity reversal
of Eo.
5.8
A
SCHMITT TRIGGER
USING
THE
OPERATIONAL
AMPLIFIER;
The
operation of a Schmitt Trigger
is
similar
to
that of
a comparator
except
that
V
ref
is
derived from
the
value of Eo.
Connect
the Operational Amplifier
as
shown below:-
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