ARP 2600 - 1 V;Octave Calibration for VCF; Voltage Controlled Amplifier (VCA) Adjustments; High Frequency Rejection Adjustment

113
4. Set
the
VCO-3 frequency
to
1 KHz.
5.
Raise
the
Filter input
from VCO-3
to
maximum,
the Filter
initial frequency to
maximum,
and the
Filter
input to
the
VCA to
maximum. Center the
panpot
and
raise the
two
Speaker
Volume controls
to
maximum.
6.
NOW
ADJUST
THE VCA
TRIMMER
LABELLED
"Hl-
FREQ
REj"
UNTIL
THE
HIGH
FREQUENCIES
HEARD
THROUGH
THE SPEAKERS ARE
AT
A
MINIMUM.
6.132 CONTROL
REJECTION.
1
.
Set all
controls to minimum.
2.
With
a
patch cord, connect the VCO-2
SINE
OUTPUT to
the
VCA LINEAR
CONTROL
input.
Set VCO-2 to
1
KHz.
3. Raise
the LINEAR CONTROL
input attenuator to maximum
and the Mixer
VCA input to
maximum, and the Speaker
Volume
controls
to maximum.
4.
ADJUST THE
VCA TRIMMER LABELLED
"CONTROL
REJ"
FOR MINIMUM
SIGNAL
THROUGH
THE
SPEAKERS.
6.133 GAIN
ADJUSTMENTS.
1
.
Set
all
control
sliders at
minimum,
i.e.
down
or left,
position.
2. Advance Filter
RESONANCE to
maximum
and INITIAL
FREQUENCY
to IKHz.
3.
With
patch cords,
connect
the Filter output to
INVERTER
INPUT
No. 1 in the Voltage
Processor section; connect the
inverter
OUTPUT to the first
MIXER input,
interrupting
the
VCF connection to
that
input.
4. Raise
to maximum
both Mixer inputs
and
the
Filter input
to the
VCA.
6.1331
LINEAR
GAIN
ADJUSTMENT:
continued through
from
6.133
5.
Raise the
VCA INITIAL GAIN
to maximum.
Raise the
i
Speaker Volume controls to a
comfortable
listening level.
6.
NOW
ADJ
UST THE
VCA
"LINEAR
GAIN"
TRIMMER FOR
MINIMUM AUDIBLE SIGNAL THROUGH
THE SPEAK-
ERS. Raise the
speaker volume
controls
to maximum if
necessary.
7.
Return
the
VCA INITIAL GAIN
control
to
minimum.