24
V
a
signal
through at full strength.
"Closing" the
attenuator control
slowly— i.e. sliding
it down—
gradually weakens the signal passing
through
it until
there is no signal at all.
3.11412 MOST OF THE ATTENUATORS in
the 2600
are directly
associated
with either an
input
to
something
or an output
from some-
thing.
Each of the
vertical
attenuators
across the middle
of the
2600,
for example,
controls the
amplitude of
a
signal coming
through the
input
directly below it.
3.1
142
There is no one thing
that the other
slider controls
do;
the
function
of
each one is indicated separately on the panel.
3.1
1
5 The knob is
a
rotary attenuator for signals
fed
to the micro-
phone
preamplifier
3.1
1
6
The button is a manual
starter for
the envelope
generators.
3.1 1 7
One of the
switches is
a
power switch to
turn the 2600 on
and
off.
Of
the other
six,
one
selects
three ranges of amplification in
the
mike
preamp, one selects AC or DC
coupling of the
ring
modulator,
three
select frequency ranges for the
VCO's,
and
one selects keyboard
or
other control of
the
envelope generators.
3.1 1 8
The headphone
jack
is
for
a
standard
stereo headphone
plug.
Inserting one disconnects
the speakers. The headphones
should be
8-ohms
impedance.
3.1
1 9
That's
all
there is to the main
unit.
3.12
The 3604 keyboard has four octaves and
is plugged into the
main unit by
two short
cables, one at each end. The
plug blades
are
arranged so
that it is
impossible
to
plug them in
the wrong way.
3.121
In addition to
keys—49
of them—
the keyboard unit has
three
switches
and
three
knobs.
The switches are
on-off
and
the
knobs are
more-or-less.
3.2
THE MOST USEFUL and
MOST
FREQUENTLY USED
con-
nections in
the Model 2600
ARE
PREWIRED.
3.21
To
see
a
simple example of this,
note
that the
first input
jack on
the
left,
in
the row of jacks
running across the middle
of the
2600,
is
an input
to
the ENVELOPE
FOLLOWER.
Underneath
the
jack is
a
symbol that looks
like this
|
and
under the symbol is a
7
ixi
'
\
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