Thank you for your purchase of the EQ101 10-Band Graphic Equalizer.
This unit is designed and manufactured to provide years of quality
service. Please read this manual carefully for proper operation and care.
INSPECTION
1. Unpack and Inspect the EQ101 package
Be sure to examine the unit and the carton for any signs of damage that
may have occurred during shipping. If obvious physical damage is
noticed, contact the carrier immediately to make a damage claim. We
suggest saving the shipping car ton and packing materials for safely
transporting the unit in the future.
2. Please complete the Warranty Registration Card and return it to the
factory.
DESCRIPTION
REAR PANEL
IN: 1/4" TS unbalanced and RCA jacks for connection to input signal.
This could be an instrument or the output of a signal processor.
OUT: 1/4" TS unbalanced and RCA jacks for connection to an amplifier,
or mixer.
LVL: This control adjusts the overall level of the equalizer. Note that the
center position is detented for easy location of unity gain.
32 through 16K: These controls boost or cut the indicated frequency.
When the slider is in the center (detented) position, the frequency is not
effected.
BYPASS/EQ SWITCH: Selects whether the input signal is sent through
the equalization circuitry (EQ) or is sent directly to the outputs (BY-
PASS). Note that the EQ101 has a "hard-wire" bypass meaning that if
there is no power connected to the unit, signal will still be present at the
outputs.
PWR: This LED indicates that power is applied to the EQ101.
12 - 17 VDC: For connection to the AC adapter. Please use either the
ROLLS PS27, or a proper adapter with 12 - 17 VDC, 150 mA, outside of
barrel positive.
OPERATION
Shown below is an example of connection and operation of the EQ101.
SCHEMATIC
IN
OUT
IN
OUT
PWR
EQ
BYPASS
LVL
12 - 17
VDC
32
64
125 250 500
1K
2K
4K
8K
16K
EQ101
+12
-12
0
+
-
IN
OUT
IN
OUT
PWR
EQ
BYPASS
LVL
12 - 17
VDC
32
64
125 250 500
1K
2K
4K
8K
16K
EQ101
+12
-12
0
+
-
Signal processor or preamplifier
To amplifier
or mixer
Graphic equalizers boost the
indicated frequency. Low
frequencies are equivalent to
bass sounds and high fre-
quencies equal treble sounds.
1
2-Apr-1999
Document Number:
Date:
Sheet
of
Ba
P 3
P 1 0 0 K S S
P 2
P 1 0 0 K S S
P 1
W 1 0 0 K C C
J 1
P H O N E 1 / 4
J 2
P H O N E 1 / 4
J 3
R C A J A C K
J 5
R C A J A C K
C 2 4 1 U
2
3
1
4
U 1 A
4 5 6 0
6
5
7
8
U 2 B
4 5 6 0
2
3
1
4
U 2 A
4 5 6 0
R 1
1 K
R 3
1 K
R 2
1 0 0 K
R 4
1 0 0 K
1
2
3
S W 1 A
D P D T
4
5
6
S W 1 B
D P D T
C 2 5
1 0 U
R 2 4 1 8 K
R 2 5
1 8 K
R 2 3
4 . 7 K
R 2 2
4 . 7 K
C 1
. 0 6 8
BIAS
BIAS
BIAS
BIAS
C 3
. 0 3 9
VCC
P 5
P 1 0 0 K S S
P 4
P 1 0 0 K S S
6
5
7
8
U 3 B
4 5 6 0
2
3
1
4
U 3 A
4 5 6 0
R 5
1 K
R 7
1 K
R 6
1 0 0 K
R 8
1 0 0 K
C 1 0
C 5
. 0 1 5
BIAS
BIAS
C 7
. 0 0 8 2
VCC
P 7
P 1 0 0 K S S
P 6
P 1 0 0 K S S
6
5
7
8
U 4 B
4 5 6 0
2
3
1
4
U 4 A
4 5 6 0
R 9
1 K
R 1 1
1 K
R 1 0
1 0 0 K
R 1 2
1 0 0 K
C 1 2
C 1 4
C 1 1
. 0 0 3 9
BIAS
BIAS
C 1 3
. 0 0 2 2
VCC
P 9
P 1 0 0 K S S
P 8
P 1 0 0 K S S
6
5
7
8
U 5 B
4 5 6 0
2
3
1
4
U 5 A
4 5 6 0
R 1 3
1 K
R 1 5
1 K
R 1 4
1 0 0 K
R 1 6
1 0 0 K
C 1 6
. 0 6 8
C 1 8
. 0 3 3
C 1 5
8 2 0 P F
BIAS
BIAS
C 1 7
4 7 0
VCC
P 1 1
P 1 0 0 K S S
P 1 0
P 1 0 0 K S S
6
5
7
8
U 6 B
4 5 6 0
R 1 7
1 K
R 1 8
1 0 0 K
C 2 0
. 0 1 5
. 0 0 8 2
C 1 9
2 7 0 P F
BIAS
BIAS
VCC
A
I N 9 - 1 5 V A C / V D C
C 1
1 0 0 0 U F
D 1
1 N 4 0 0 X
2
3
1
J 4
J A P D C
C 2 6
4 7 U
R 2 7
2 2 K
R 1 9
1 8 K
VCC
R 2 9
1 0 K
R 2 6
1 0 K
6
5
7
8
U 1 B
4 5 6 0
VCC
C 3 0 2 7 P F
C 8
2 7 P F
D 2
L D S G
R 2 8
4 . 7 K
2
3
1
4
U 6 A
4 5 6 0
R 2 0
1 K
R 2 1
1 0 0 K
C 2 1
1 2 0 P F
C 6
C 4 1 . 5 U F
C 2
3 . 3 U F
C 2 3
5 0 3
1UF
.47
.27
.12
C22
ROLLS CORPORATION
5143 South Main Street
Salt Lake City, UT 84107
10 BAND PRECISION EQ EQ101
Rev.
Size
EQ101.SCH
1
