1
PA71.SCH
A
25 MAY 2001
Date:
Rev:
Sheet 1 of
PA71 POWER AMP
Ba
2
3
1
J 5
J A P D C
D 5
L D R R
1
1
2
2
3
3
4
4
5
5
6
6
7
7
U 1
T D A 7 2 4 0 A
P 2
P 1 0 0 K
C 1 0
1 U
C 1 3
4 7 U
C 1 4
1 0 U
C 1 1 . 1
C 1 8
1 U
C 1 2 . 2 2
C 1 5
. 2 2
R 1 3
2 . 2
R 1 4
2 . 2
C 1 6
1 0 0 0 U F
R 1 5
1 0 K
+V
V O L U M E
1
2
J 4
C O N 2
J 3
P H O N E 1 / 4
D 1
1 N 4 0 0 1
D 2
1 N 4 0 0 1
D 3
1 N 4 0 0 1
D 4
1 N 4 0 0 1
C 1 7
+V
1
2
3
J 2
P C R C A X 2
R 8
2 2 K
R 7
2 2 K
R 1 1
2 2 K
2
3
1
4
4 5 6 0
6
5
7
8
4 5 6 0
C 8
2 5 P F
C 6
4 7 0 P F
C 5
4 7 0 P F
1
2
3
J 1
X L R F P C
R 3
3 3 2 1 %
R 4
3 3 2 1 %
R 6
2 2 K
R 5
R 1 2
2 2 K
+V
+V
+V
C 7
1 U
C 4
4 7 U
C 3
4 7 U
C 1 4 7 U
C 2 4 7 U
R 2
R 1
4 . 9 9 K 1 %
P 1
P 1 0 0 K
R 9
2 2 K
C 9
1
H 1 A
H D 3
2
H 1 B
H D 3
3
H 1 C
H D 3
2 2 K
4 . 9 9 K 1 %
U 2 B
U 2 A
4 7 U
R 1 0
2 2 K
ROLLS COPRORATION
5968 SOUTH 350 WEST
SALT LAKE CITY, UT 84107
S i z e :
D o c u m e n t n u m b e r ;
2 2 0 0 U F 1 6 V
INTRODUCTION
Thank you for your purchase of the PA71 Plus MicrMix Power Amplifier.
This unit mixes a stereo RCA signal with a microphone to a 1/4" line level
output and a powered spring loaded speaker output. The unit for powering
small speakers in small environments. The 1/4" output is specially de-
signed to power stereo headphones.
DESCRIPTION
REAR PANEL
LINE INPUT: RCA line level inputs (mixed to mono)
MIC INPUT: Balanced XLR input for connection to a dynamic or con-
denser microphone.
LINE/POWER OUT: 1/4" TRS output for connection to another amplifier,
or a pair of standard headphones.
SPEAKER OUTPUT: Spring-loaded terminals - the red terminal is
positive and the black one is negative.
12VAC/VDC: For connection to the power supply.
SIDE PANEL
PHANTOM POWER: Jumper pin for connecting 12 volts of phantom
power to the Mic Input.
FRONT PANEL
LINE LEVEL: Adjusts the level of signal from the Line Input to the Line/
Power and Speaker outputs.
MIC LEVEL: Adjusts the level of signal from the Line Input to the Line/
Power and Speaker outputs.
CONNECTION / OPERATION
Connect input sources such as CD players or cassette players to the
RCA inputs, connect a microphone to the balanced XLR Mic Input. If the
microphone is a condenser type, move the Phantom Power jumper to
connect the indicated pins.
WARNING: DO NOT GROUND THE SPEAKER OUTPUT
TERMINALS. THE SPEAKER TERMINALS ARE NOT AT
GROUND POTENTIAL.
SPECIFICATIONS
Line Input Impedance:
47K
9
Mic Input Impedance:
600
9
Phantom Power Voltage:
12 V
Power Output:
5 Watts (8 Ohms)
Voltage Gain:
40 dB
Maximum Supply Voltage:
18 VDC
THD:
.05% typical
EIN:
3 mV
Efficiency:
65%
Input Sensitivity:
28 mV
Bandwidth:
20Hz - 25 kHz
Size:
4.25" x 2.375" x 1.5"
Weight:
1 lb.
SCHEMATIC
MIC
INPUT
LINE
INPUT
LINE/
POWER
OUT
SPEAKER
OUTPUT
12 VAC/
VDC
PWR
LINE
LEVEL
MIC
LEVEL
PHANTOM
POWER
