Orban 8182A - Page 9

8 182A
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.