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Moog Satellite Service Manual

Moog Satellite
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to
.he-
voltage
difference
betv/een
their
bases.
The
current
from
pin
1
of
IC11
is
kept
constant
via
a
feedback
network.
The
voltage
at
}>in
1
is
compared
with
the
voltage
at
the
junction
of
R28
and
R29
.
Any
voltage
difference
generates
an
error
signal
which
changes
the
total
current
to
the
transistor
pair
in
IC11.
When
the
"two
octave"
switch
is
R30
conducts
and
Q49
is
saturated.
Thin
effectively
places
the
series
combination
of
R20
and
R21
in
parallel
with
R19.
The
voltage
at
pin
1
of
IC11
is
then
det<;n
ir.ed
by
the
current
which
flows
through
the
parallel
'res.si.ors
R19
and
R20-21.
When
the
"two
octavo"
switch
is-ifp-,
R30
does
not
conduct,
Q49
is
open,
and
R20-21
are
out
of
the
circuit.
Thus
the
current
from
pin
1
of
IC11
is
one
quarter
as
much
when
049
is
open
as
it
is
when
it
is
saturated
and,
for
the
same
voltage
difference
between.the
bases,
the
current
from
pin
5
is
also
one
quarter
as
much.
-
The
lower
end
of
C38
is
applied
to
low-current
voltage
fol
.over
IC12-Q46.
The
voltage
at
the
emitter
of
Q46
is
fed
to
Schmitt
trigger
Q43-44.
The
Schmitt
trigger
has
high
hysteresis.
When
the
voltage
descends
to
the
point
where
the
Schmitt
trigger
firos,
Q45
is
turned
on
and
C38
is
rapidly
discharged.
The
Schmitt
trigger
begins
to
shut
off
when
the
discharge
is
about
2/3
complete.
Because
of
the
storage
time
of
Q44
and
Q45,
C38
is
!ully
discharged
before
Q45
is
completely
off.
The
sawtooth
wave
developed
at
the
emitter
of
Q46
(Fig.
4)
is
applied
through
R41
to
the
base
of
Q47
and
through
R43
to
the
col.
ector
of
Q48.
Q47
is
a
high
gain
amplifier.
The
width
of
the
rectangular
wave
that
appears
at
its
collector
depends
on
the
bias
current
supplied
through
R45
from
the
output
of
xC13.
The
control
current
which
is
fed
to
the
input
of
IC13
from
the
res
.stor
matrix
determines
the
output
voltage
of
IC13.
When
the
control
current
is
zero,
Q47
remains
saturated
throughout
the
entire'sawtooth
cycle.
Q48
also
remains
shut
off,
and
the
vol-ace
across
R120
is
the
undistorted
sawtooth.
As
the
conrrol
current
increases,
the
voltage
at
the
output
of
IC13
goes'negative.
When
it
is
about
-1
volt,
the
current
through
Rll.T
is
enough
to
completely
saturate-
Q48
and
effectively
short
out
the
sawtooth
waves.
When
it
is
about
-3
volts,
Q47
begins
to
conduct
on
part
of
the
sawtooth
cycle
and
a
narrow
rectangular
wavoferm
appears
at
its
collector.
When
the
voltage
at
the
out¬
put
of
IC13
is
about
-9
volts,
the
clipping
of
Q47
is
symmetrical
and
a
square
wave
appears
at
its
collector.
Thus,
the
vaveform
at
the
junction
of
R119
and
R120
is
first
a
sawtooth
when
the
com.
rol
current
into
IC13
is
zero,
then
changes
to
a
narrow
rectangular,
then
to
a
broad
rectangular,
and
finally
to
a
square
wavi
as
the
control
current
is
increased.
This
waveform
is
fed
to
the
bandpass
filter.
The
bandpass
filter
consists
of
IC15,
IC16,
and
IC.17,
and
their
associated
components.
The
input
signal
is
fed
to
IC15
and
IC’6.
IC16
and
IC17
are
identical
integrators
which
are
effectively
connected
in
series.
If
it
were
not
for
IC15,
the
duai
integrator
network
would
produce
two
poles
which
would
be
ver}
n
;ar
to
the
imaginary
axis.
The
presence
of
IC15
moves
these
poles
to
the
left.
Thus,
the
gains
of
IC16
and
IC17
determine
the
center
frequency
of
the
filter,
and
the
gain
of

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Moog Satellite Specifications

General IconGeneral
BrandMoog
ModelSatellite
CategorySynthesizer
LanguageEnglish

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