Rolls PA202 User manual

PA202
Mini 20 + 20 watt
Power Amplifier
Operation guide
Salt Lake City, Utah
3/09
PA202
Mini Power Amplifier
• RCA Inputs
• Dual volume controls
• Screw terminal in and out
• Low noise, efficient operation
• Small compact size
• Class D high efficiency amp
The PA202 is a very compact 20 + 20 watt high efficiency amp
with barrier strip terminals for the balanced input and speaker out-
puts. The unit is perfect for small speakers in small environments.
Great for in ceiling and projector applications where small size is
needed along with class D low radiated heat locations.
The bridge - stereo function of the PA202 is a way of converting the unit
from two channels at 20 watts each to one channel at 40 watts. To do
this depress the CONFIGURATION SWITCH and follow the silk screen-
ing on the chassis for the mono-bridge operation.
Bridge or Stereo Operation:
WARNING:
WARNING:
THE MINIMUM SPEAKER IMPEDANCE FOR
STEREO (2 CHANNEL OPERATION) IS 4 OHMS EACH.
WARNING:
WARNING: THE MINIMUM SPEAKER IMPEDANCE FOR
MONO/BRIDGE IS 8 OHMS.
IF YOU CONNECT AND USE THE PA202 WITH A LOWER
SPEAKER IMPEDANCE THAN LISTED ABOVE YOU
WILL DAMAGE THE UNIT AND POSSIBLY OTHER
EQUIPMENT THAT IS CONNECTED TO THE PA202.
PWR
LEFT
RIGHT LEFT RIGHT
RIGHT LEFT
BRIDGE
INPUTS
RISQUE DE CHOC - NE PAS ENLEVER
WARNING:
DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.
TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER.
NO USER SERVICABLE PARTSINSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
-+ -+
CONFIGURATION
BIRDGE:
STEREO:
LIMITER
PA202
Mini Two ChannelAmp
20 X 20 watts
off on
CHANNEL VOLUME
BRIDGE
OUTPUTS:
LEFT RIGHT
BRIDGE INPUTS
PWR
LEFT
RIGHT LEFT RIGHT
RIGHT LEFT
BRIDGE
+
-
INPUTS
BRIDGE:
OUTPUTS
SERIAL NUMBER
RISQUE DE CHOC - NE PAS ENLEVER
WARNING:
DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.
TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER.
NO USER SERVICABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
-+
-+
-
+-+
-+
STEREO:
CONFIGURATION
BRIDGE:
STEREO:
VDC
LIMITER
PA202
Mini Two Channel Amp
20 X 20 watts
off on
CHANNEL VOLUME
BRIDGE
OUTPUTS:
LEFT RIGHT
BRIDGE INPUTS
67 5 8 8 9 0 2 0 2 0 5
WARNING:
WARNING: DO NOT GROUND THE SPEAKER OUTPUT
TERMINALS. THE SPEAKER TERMINALS MAY NOT BE
AT GROUND POTENTIAL.

1
Rolls Corporation
5968 S 350 W
Murray Utah 84107
1
PA202.SCH 2199
28 February 2009
Title
Size: Document Number:
Date:
Rev:
Sheet of
PA20220WSTEREOAMP
FXa
VCC
+V
+VB
2
3
1
JAPDC
J2
47U
C25 22K
R17
10K 1%
R4
10K1%
R1
10K 1%
R2
470PF
C3
470PF
C4
1N400X
D6
BLUE
D5
18K
R59
10K
R18
P100K
P2
+VB
+VB
1U
C2
1U
C1
10K
R5
+V 47U
C24
47K
R16
2N3904
Q1
LINE INS
Rolls 24VDC adapter
P100K
P1
5
67
8
4560
U2B
10K 1%
R3
+VB
+VB
PVCCL 1
SD
2
MUTE
3
LIN
4RIN
5
BYPASS
6
AGND
7AGND
8
VCLAMP
9
PVCCR 10
PGNDR 11
ROUT 12
BSR 13
GAIN1
14
GAIN0
15
AVCC 16
AVCC 17
BSL 18
LOUT 19
PGNDL 20
TPA3122D2N
U1
470U
C18 470U C19
470U
C15
470U
C16
1uF
C5
1uF
C6
1uF
C11
1uF
C12
.1uF
C17 .1uF C20 .1uF C21 .1uF C22
.22uF
C13
.22uF
C14
22uH
L1
22uH
L2
4.7K
R6
4.7K
R11
.68uF
C26
.68uF
C27
VCC VCC VCC VCC
RIGHT
BRIDGE
SCREW TERMINALS
RIGHT
LEFT
VCC
SPEAKER OUT
PINS 14, 15 SET TO 32dB
VCC
FUSE1
F1
1 2
4 3
VTL5C3
U3
1 2
4 3
VTL5C3
U4
1N4148D3
1N4148
D1
1N5231b
D4
1N5231b
D2
330R13
330 R15
10K 1%
R9
10K1%
R7
10K 1%
R8
470PF
C9
470PF
C10
1U
C8
1U
C7
10K
R10
3
21
4
4560
U2A
10K 1%
R44
+VB
LEFT
31
2SPST
SW1
LIMIT ON
12
3
DPDT
SW2A
45
6DPDT
SW2B
use 4ec 2 patte rn
3
4
RCAX2
J1B
1
2
RCAX2
J1A
PORT + 1
PORT - 2
GND 3
PORT + 4
PORT - 5
HDR5X2 00
HD1
PORT +
1
PORT -
2
PORT +
4
PORT -
3
HDR4X2 00
HD2
1N5242
D7
SCHEMATIC
INTRODUCTION
Thank you for your purchase of the PA202 mini 20 X 20 watt Power Am-
plifier. The unit for powering speakers in small environments.
REAR PANEL
SPEAKER OUTPUT: Barrier screw terminals.
VDC: For connection to the power supply.
FRONT PANEL
CHANNEL VOLUME: Adjusts the level of signal from the Line Input to
the Line/Power and Speaker outputs.
INPUTS: RCA line level inputs and balanced barrier screw terminals
BRIDGE/MONO SWITCH: For selecting the operation of stereo or mono
bridge input and output operation.
LIMITER SWITCH: For selecting on or off of the limiter circuit.
CONNECTION / OPERATION
Connect input sources such as CD player, DVD player or projector out-
puts to the inputs of the PA202.
Select the bridge or stereo function. The PA202 is shipped from the
factory in stereo mode. To select bridge mode push in the switch until it
locks into position.
Connect the outputs from the PA202 to your speakers. The stereo and
bridge outputs are labeled on the silk screening of the unit.
We recommend selecting the LIMITER ON function, but the circuit may
be disabled by selecting the OFF position.
SPECIFICATIONS
Line Input Impedance: 47K Ohms
Power Output: 20 Watts X 2 (8 Ohms)
Voltage Gain: 32 dB
Maximum Supply Voltage: 30 VDC
THD: .05% typical
EIN: 3 mV
Efficiency: 85%
Input Sensitivity: 28 mV
Bandwidth: 20Hz - 25 kHz
Size: 6" x 3.5" x 1.5"
Weight: 1 lb.
DESCRIPTION
NOTE: THIS MANUAL ASSUMES THE USER HAS A WORKING KNOWL-
EDGE OF AUDIO ELECTRONICS, BALANCED AND UNBALANCED CON-
NECTIONS, AND PROPER SIGNAL LEVEL SETTING.
INSPECTION / WARRANTY
1. Unpack and inspect the PA202 box and package.
If obvious physical damage is noticed, contact the carrier immediately to make a
damage claim. We suggest saving the shipping carton and packing materials for
safely transporting the unit in the future.
2. Please visit our web site at www.rolls.com and click on the Register Your War-
ranty Here button, or complete the Warranty Registration Card and return it to the
factory. The limiter is a function that will not allow very loud signals to pass
through the PA202 by limiting their volume temporarily to a normal level,
preventing damage to the speakers or the unit its self. It is important to
note that the limiter utilizes a circuit that decreases the amount of very
loud signals it does not cut out all potentially loud signals. Proper instal-
lation and setup is crucial. If you are experiencing distortion turning the
Limiter on may help but it is not intended for total dynamics control. Its
primary function is to help prevent one time very loud signals like drop-
ping a microphone or loud program material that is temporary.
LIMITER EXPLANATION:
PWR
LEFT
RIGHT LEFT RIGHT
-+ -+ LIMITER
off on
CHANNEL VOLUME
BRIDGE
LEFT RIGHT
BRIDGE INPUTS
+
-
BRIDGE:
OUTPUTS
SERIAL NUMBER
-+
-
+-+
STEREO: VDC
The holes in the back and
side of the PA202 are for the
attachment of a zip tie (not
included). For power cord
strain relief as needed.