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PT2301 V1.4

- 4 -

April, 2006

1 Watt Audio Power Amplifier

PT2301

APPLICATION CIRCUIT II (PT2301-B)

VCC

/SHUTDOWN

8 ohm

RR2 24K

RR1 24K

SCL

SDA

RL2 24K

RL1 24K

R4 10K

R3 10K

L2R

L1R

C5 1uF

C4 1uF

100uF

L2L

L1L

VCC

C6 1uF

C7 1uF

Microphone Jack

MIC OUT

Internal MIC IN

External

MIC IN

C2 1uF

C8 1uF

C9 1uF

PT2301-B

/SHUTDOWN

1uF

10

12

11

8

9

7

Cb

L2R

REF

L1R

MICOUT

MIC2

VCC

15

VSS1

MUTE

13

14

VP2

SP-

ROUT

16

17

18

MUTE

100uF

VCC

HP_SENSE

MIC_SENSE

3

1

2

6

5

4

MIC1

SCL

SDA

VSS2

L2L

L1L

C11

22

LOUT

NC

SP+

VP1

20

19

21

23

24

C12

300uF

300uF

4.7K

10K

R7

10K

VCC

R8

4.7K

C3

100uF

Headphone Jack

R9 1K

R10 1K

10uF

Cb1

VCC

Notes

1. The (+) polarity of DC block capacitor installed in the I/O pin of the PT2301 should face towards the

higher potential.

2. The gain setting resistors (R3、R4、RL1、RL2、RR1、RR2 ) should be kept as close as possible

with the PT2301 chip to prevent pick up noises.