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

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

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