Orban 8182A Operating Manual page 9

8
182
A
LED
Meter Display
Upgrade
IC6
is
the
250Hz
dither oscillator.
IC6-B
is
an integrator
charged
from
the
output
of IC6-A, which
acts
as a
comparator.
Positive
feedback from
the
output of IC6-B
through
R2
causes
the
output of
IC6-A
to
abruptly
change
state
each time
the
output of IC6-B reaches
approximately ±0.046V.
The
output of
IC6-A
is
thus
a
square
wave, and IC6-B
integrates this
square
wave
to
form
the desired
triangle
wave.