Rolls PA71PLUS Introduction, Description, Connection / Operation, Specifications, Schematic

Page 2

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.

LINE

MIC

LINE/

SPEAKER

12 VAC/

INPUT

INPUT

POWER

OUTPUT

VDC

 

 

OUT

 

 

PHANTOM

 

 

 

 

POWER

 

 

 

 

 

LINE

 

MIC

 

LEVEL

 

LEVEL

PWR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H1A H1B H1C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HD3 HD3 HD3

 

 

 

 

C6

 

 

 

 

 

 

 

 

 

 

 

 

+V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R5

470PF

 

 

 

 

 

 

 

 

 

1

2

3

 

 

 

22K

 

 

 

 

 

 

 

 

 

R1

 

R2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4.99K1%

 

4.99K1%

 

R3

 

+V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C147U C247U 3321%

 

8

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

XLRFPC

J1

 

 

 

 

6

 

 

7

 

 

 

 

 

 

 

 

 

3

 

 

 

R4

5

U2B

P1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C3

C4

3321%

C5

4560

 

 

 

 

 

 

 

 

 

 

 

 

47U

47U

R6

470PF

 

 

P100K

 

 

+V

 

 

 

1

 

 

22K

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C11

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R12

 

 

.1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

J2

R7

 

 

P2

VOLUME

 

 

22K

 

 

C18

 

 

 

 

C7

 

 

 

 

 

 

 

 

 

PCRCAX222K

P100K

 

 

 

 

 

 

 

C12

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1U

.22

 

 

 

 

 

 

 

 

 

 

C8

 

 

 

 

 

 

 

 

 

3

 

 

1U

 

 

 

 

 

U1

 

 

R13

 

 

 

 

 

 

 

 

 

 

 

6

 

 

 

 

 

R8

 

 

 

 

25PF

 

 

 

TDA7240A

 

2.2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7

 

 

2

 

22K

 

 

2

 

4560

 

 

 

 

6

7

J4

 

 

 

 

 

 

 

 

R11

C10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+V R9

 

 

 

1

3

 

 

 

 

1

 

 

 

 

 

 

3

U2A

 

3

 

 

 

 

 

 

 

 

 

 

 

 

 

22K

 

 

 

 

5

2

 

 

 

 

 

 

22K

 

 

 

 

 

1U

2

1

4 5

CON2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

 

 

 

 

 

 

 

R14

C16

 

 

 

 

 

 

 

 

 

 

 

 

 

2

1

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.2

1000UF

J3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PHONE1/4

 

 

 

 

 

 

C9

 

R10

 

 

C13

 

 

C15

 

 

 

 

 

 

 

 

 

22K

 

 

47U

 

 

.22

 

 

 

 

 

 

 

 

47U

 

 

 

 

 

 

 

C14

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10U

 

 

 

 

 

 

 

 

 

 

 

D1

 

+V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1N4001

 

C17

R15

 

 

 

 

 

 

 

 

 

 

 

 

 

D2

 

 

2200UF16V

10K

 

 

 

 

 

 

 

 

 

J5

 

 

 

1N4001

 

 

D5

 

 

 

 

 

 

 

 

 

 

 

 

D3

 

 

 

LDRR

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

1N4001

 

 

 

 

 

 

 

 

 

 

 

 

JAPDC

 

 

D4

 

 

 

 

 

 

ROLLS COPRORATION

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5968 SOUTH 350 WEST

 

 

 

 

 

 

 

 

 

1N4001

 

 

 

 

 

SALT LAKE CITY, UT 84107

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PA71 POWER AMP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Size:

Documentnumber;

 

Rev:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ba

PA71.SCH

 

A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Date: 25 MAY 2001

Sheet 1 of 1

Image 2
Contents MicroMix Introduction SpecificationsSchematic Description

PA71PLUS specifications

Rolls PA71PLUS is a sophisticated power amplifier that stands out in the audio equipment market due to its impressive features and robust performance capabilities. Designed primarily for professional audio applications, the PA71PLUS delivers exceptional sound quality while maintaining the reliability needed for live events, installations, and studio use.

One of the main features of the Rolls PA71PLUS is its power output. It provides a substantial 70 watts per channel at 4 ohms, allowing it to drive a wide range of speakers effectively. This power level is ideal for both small and medium-sized venues, making it versatile enough for various applications, including concerts, conferences, and corporate events.

The PA71PLUS also boasts an advanced protection circuit that safeguards the amplifier and connected speakers from damage caused by overheating, overloading, and short circuits. This technology ensures that the device operates within safe parameters, thereby extending its lifespan and maintaining consistent performance.

Another significant characteristic of the PA71PLUS is its dual-channel configuration, which enables users to run two separate audio sources simultaneously. This feature is particularly beneficial for live performances where multiple inputs are required, such as a combination of microphones and instruments. Additionally, the amplifier includes various input options, including XLR, 1/4” TRS, and RCA connectors, ensuring compatibility with a wide array of audio sources.

The built-in EQ allows for precise sound tailoring, enabling users to adjust the frequency response to suit the specific acoustics of their environment. This level of control is crucial for achieving the best possible sound quality, ensuring clear and rich audio reproduction.

Furthermore, the Rolls PA71PLUS is designed with a rugged metal chassis, making it resilient in demanding environments. The front panel includes easy-to-read LED indicators that provide real-time feedback on the amplifier's status, making it user-friendly and straightforward to operate.

In summary, the Rolls PA71PLUS offers a combination of power, durability, and user-friendly features, making it an exceptional choice for audio professionals. Its high output, advanced protection circuitry, and versatile input options set it apart in the competitive audio amplifier market, catering to the needs of sound engineers, musicians, and event organizers alike.