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
G
2
O
3
U 2
7 8 1 2
D 1
1 N 4 0 0 1
C 9
1 K U F
3
4
8
1
11
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
15
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
8
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
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