Rolls MO 2020 is a signal generator for electronic testing in the audio frequency range. It has a 1/4" unbalanced sine wave output, and a 1/4" unbalanced square wave output. Its frequency range is from 20Hz to 24kHz and the outputs have separate level controls. For external control or sweeping of the frequency range, a 1/4" VCO input is provided to receive 1.2 to 5 volts dc. Here are some possible use cases:
- Testing audio devices such as amplifiers, speakers, and microphones
- Generating sine waves or square waves for use in electronic circuits
- Providing a reference signal for tuning musical instruments
Rolls MO 2020 is a signal generator for electronic testing in the audio frequency range. It has a 1/4" unbalanced sine wave output, and a 1/4" unbalanced square wave output. Its frequency range is from 20Hz to 24kHz and the outputs have separate level controls. For external control or sweeping of the frequency range, a 1/4" VCO input is provided to receive 1.2 to 5 volts dc. Here are some possible use cases:
- Testing audio devices such as amplifiers, speakers, and microphones
- Generating sine waves or square waves for use in electronic circuits
- Providing a reference signal for tuning musical instruments
MO2020
TESTOSCILLATOR
Signal Generator
Owners Manual
LIMITED WARRANTY
This product is warranted to the original consumer purchaser to
be free from defects in materials and workmanship under normal installa-
tion, use and service for a period of one (1) year from the date of purchase
as shown on the purchaser’s receipt.
The obligation of Rolls Corporation under this warranty shall be
limited to repair or replacement (at our option), during the warranty period
of any part which proves defective in material or workmanship under
normal installation, use and service, provided the product is returned to
Rolls Corporation, TRANSPORTATION CHARGES PREPAID. Products
returned to us or to an authorized Service Center must be accompanied by
a copy of the purchase receipt. In the absence of such purchase receipt, the
warranty period shall be one (1) year from the date of manufacture.
This warranty shall be invalid if the product is damaged as a
result of defacement, misuse, abuse, neglect, accident, destruction or
alteration of the serial number, improper electrical voltages or currents,
repair, alteration or maintenance by any person or party other than our
own service facility or an authorized Service Center, or any use violative
of instructions furnished by us.
This one-year warranty is in lieu of all expressed warranties,
obligations or liabilities. ANY IMPLIED WARRANTIES, OBLIGA-
TIONS, OR LIABILITIES, INCLUDING BUT NOT LIMITED TO THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE, SHALL BE LIMITED IN DURA-
TION TO THE ONE YEAR DURATION OF THIS WRITTEN LIMITED
WARRANTY. Some states do not allow limitations on how long an
implied warranty lasts, so the above limitation may not apply to you.
IN NO EVENT SHALL WE BE LIABLE FOR ANY SPE-
CIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES FOR
BREACH OF THIS OR ANY OTHER WARRANTY, EXPRESSED OR
IMPLIED, WHATSOEVER. Some states do not allow the exclusion or
limitation of special, incidental or consequential damages so the above
limitation or exclusion may not apply to you. This warranty gives you
specific legal rights, and you may also have other rights which vary from
state to state.
Salt Lake City, Utah
8/99
MO2020 TESTOSCILLATOR
The MO2020 is a signal generator for elec-
tronic testing in the audio frequency range. It
has a 1/4" unbalanced sine wave output, and a
1/4" unbalanced square wave output. For
external control or sweeping of the frequency
range, a 1/4" VCO input is provided to receive
1.2 to 5 volts dc.
• Freququency range from 20Hz to 24kHz
• 1/4" unbalanced Outputs
• Sine and Square wave outputs
• -10 dB pad for referencing
• Power Loop-Through for connection to addi-
tional unit
SQR OUT
SINE OUT
VCO INPUT
1.2 - 5 VDC
DC IN
DC
LOOP
12 - 16 VDC
+
-
MO2020
TESTOSCILLATOR
SINE/SQUARE WAVE GENERATOR
PAD
-10 dB
NORMAL
SQR LEVELSINE LEVEL
FREQUENCY
OUTPUT
PAD
PWR
MO2020
TESTOSCILLATOR
20
100
250
500
1K
24K
3K
10K
Hz
-OO
+11
-OO
+14
+5
+7
dB
dB
INTRODUCTION
Thank you for your purchase of the MO2020 Testoscillator. The MO2020
is designed to provide a sine wave, or square wave via 1/4" unbalanced
jacks, for testing audio devices. The units frequency output varies from
20Hz to 24kHz.
DESCRIPTION
FRONT PANEL
Output Pad: When depressed, the output level is dropped by 10 dB.
Frequency: Varies the frequency generated by the MO2020 from 20Hz to
24kHz. PLEASE NOTE: THE FREQUENCY MARKINGS ON THE
MO2020 ARE APPROXIMATE AND MAY VARY. FOR ACCURATE FRE-
QUENCY SELECTION, USE A RELIABLE FREQUENCY COUNTER.
Sine Level: Controls the output level of the Sine Out jack.
SQR Level: Controls the output level of the SQR (square) Out jack.
REAR PANEL (Labeling for the rear panel is located on the top of the unit)
VCO Input: 1/4" jack for connection to a Voltage Control source which
may vary from 1.2 volts to 5 volts dc. This voltage allows for external
control of the MO2020's frequency. THE FREQUENCY CONTROL MUST
BE SET TO MAXIMUM FOR PROPER OPERATION OF THE VCO
CONTROL.
Sine Out: 1/4" unbalanced jack containing the sine wave signal.
SQR Out: 1/4" unbalanced jack containing the square wave signal.
DC Loop: Paralleled power jack for connection to another MO2020.
DC In: For connection to the included Rolls power supply.
SPECIFICATIONS
Output Level: +11 dB Sine
+14 dB Square
Output Impedance: 100 Ω
THD (Sine): <1%
Size: 4.25" x 3.75" x 1.75"
Power: 12 - 16 Volts DC 50 mA
SCHEMATIC
SQR OUT
SINE OUT
VCO INPUT
1.2 - 5 VDC
DC IN
DC
LOOP
12 - 16 VDC
+
-
MO2020
TESTOSCILLATOR
SINE/SQUARE WAVE GENERATOR
PAD
-10 dB
NORMAL
SQR LEVELSINE LEVEL
FREQUENCY
OUTPUT
PAD
PWR
MO2020
TESTOSCILLATOR
20
100
250
500
1K
24K
3K
10K
Hz
-OO
+11
-OO
+14
+5
+7
dB
dB
122-Apr-1999
Document Number:
Date: Sheet of
Ba
M O 2 0 2 0 . S C H
A
VCC
VCC
VCC
VCC
VCC
VCC
VCC
S Q U A R E O U T
0 / - 1 0
S I N E L E V E L
F R E Q U E N C YL O T R I M
1 2 T O 1 8 V D C
1 . 2 - 5 V C O N T R O L
2
3
1
J 1
J A P D C
2
3
1
J 5
J A P D C
I
1
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2
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3
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7 8 1 2
D 1
1 N 4 0 0 1
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3
4
8
1
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5
7
2
U 1 A
L M 1 3 6 0 0
R 1 9
1 0 0 K
R 1 8
1 0 0 K
3
4
8
1
11
5
7
2
U 4 A
L M 1 3 6 0 0
R 1 5
1 0 0 K
R 1 3
1 0 0 K
14
13
9
16
6
12
10
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U 4 B
L M 1 3 6 0 0
2
3
1
4
U 3 A
4 5 6 0
R 1 6
4 7 K
R 1 7
4 7 K
2
3
1
4
U 5 A
4 5 6 0
6
5
7
8
U 3 B
4 5 6 0
6
5
7
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U 5 B
4 5 6 0
R 2 8
1 K
C 7
1 0 U
R 2 3
1 0 0 K
C 5
1 2 0 P F
P 5
P 1 0 0 K
J 4
P H O N E 1 / 4
J 3
P H O N E 1 / 4
C 2 1
1 U
J 2
P H O N E 1 / 4
R 3 0
1 K
1
2
3
S W 1 A
D P D T
D 2
1 N 7 5 1 A
R 3 1
1 K
R 2
3 3 0
R 1
3 3 0
R 3
3 0
R 1 0
1 0 K
R 1 1
1 0 K
R 6
3 3 0
R 5
3 3 0
R R 8
3 3 0
R 7
3 3 0
R 2 1
3 . 3 K
R 9
3 . 3 K
R 2 0
1 2 K
R 2 2
1 0 K
C 1 0
4 7 U
R 2 7
1 0 0 K
R 2 9
4 7 0
R 2 6
3 . 3 K
C 3
8 2 0 P F
C 2
8 2 0 P F
C 1
8 2 0 P F
R 2 4
1 0 K
R 2 5 4 . 7 K
R 2 6 B
6 . 8 K
C 4
5 0 P F
C 8
1 U
P 4
P 1 0 0 K
R 3 3
1 0 K
D 3
L D R G
P 2
W 1 0 0 K
C 2 3
4 7 U
C 6
6 8 U F T A N T
R 3 2
3 . 3 K
R 1 2
4 . 7 K
R 1 4
1 0 0 K
14
13
9
16
6
12
10
15
U 1 B
L M 1 3 6 0 0
P 3
5 0 K
S I N E O U T
S Q U A R E L E V E L
ROLLS CORPORATION
5143 South Main Street
Salt Lake City, UT 84107
Testoscillator MO2020
Size
Rev.
1
-
1
-
2
Rolls MO 2020 is a signal generator for electronic testing in the audio frequency range. It has a 1/4" unbalanced sine wave output, and a 1/4" unbalanced square wave output. Its frequency range is from 20Hz to 24kHz and the outputs have separate level controls. For external control or sweeping of the frequency range, a 1/4" VCO input is provided to receive 1.2 to 5 volts dc. Here are some possible use cases:
- Testing audio devices such as amplifiers, speakers, and microphones
- Generating sine waves or square waves for use in electronic circuits
- Providing a reference signal for tuning musical instruments
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