5

APPLICATION SUGGESTIONS

The recommended values of the external components are those shown on the application circuit of figure 1A. Different values

can be used, the following table reference for the designer.

Component Suggestion Value Purpose

Larger than Suggestion

Smaller than Suggestion

R1

P1

C1

C5

C6

C7

C8

C9

C2

C3

C4

R2

300k

50k

1000µF

100nF

1000µF

1µF

1000µF

100nF

470nF

470nF

470µF

10k

Volume control

Circuit

Volume control

Circuit

Supply voltage

bypass

Volume control time

costant

Output DC decoupling

Mute time costant

Output DC decoupling

Supply voltage

bypass

Input DC decoupling

Input DC decoupling

Ripple rejection

Mute time control

Larger volume regulation time

Larger mute on/ off time

Smaller volume regulation time

Smaller mute on/ off time

Danger of oscillation

Smaller volume regulation time

Higher low frequency cutoff

Smaller mute on/ off time

Higher low frequency cutoff

Danger of oscillation

Higher low frequency cutoff

Higher low frequency cutoff

Worse SVR

Lower low frequency cutoff

Lower low frequency cutoff

Better SVR

Larger volume regulation

time

Lower Low frequency cutoff

Larger mute on/ off time

Lower low frequency futoff

Volume

OP-Amp

+

-

MUTE/STBY

PROTECTIONS

9

C2

470nF

INR

30K

Volume

OP- Amp

+

-

30K

C8

1000µF

C6

1000µF

R2 10K

4

C3

470nF

INL

7

14

11

12

17

6

5

R1

300K

C5

100nF

Volume

OUTR

S1 STBY

S2 MUTE

OUTL

1,2,3,13,

18,19,20

C4

470µF

SVR 10

Varout_R

15,16

C9

0.1µF

C1

1000µF

+VS

PW_GND

VOL

P1

50K

LOG

+5V

TP1

PW_GND

PW_GND

S_GND

+5V

+5V

Varout_L

60K

APPLICATION CIRCUIT

C7

1µF

A

A

MICROELECTRONICS

GMA7496L

Audio Amp.

2W+2W AMPLIFIER W/ DC VOLUME CONTROL