COMPONENTS

RECOMMENDED

VALUE

PURPOSE

LARGER THAN

RECOMMENDED VALUE

SMALLER THAN

RECOMMENDED VALUE

R1

10K

Ω

Mute Circuit

Increase of Dz

Biasing Current

R2

15K

Ω

Mute Circuit

R3

18K

Ω

Mute Circuit

R4

15K

Ω

Mute Circuit

R5

4.7

Ω

Frequency Stability

Danger of Oscillations

Danger of Oscillations

C1

1

µF

Input DC

Decoupling

Higher Low Frequency

Cutoff

C2

1

µF

St-By/Mute Time

Constant

Larger On/Off Time

Smaller On/Of Time

C3, C5

1000

µF

Supply Voltage

Bypass

Danger of Oscillations

C4, C6

0.1

µF

Supply Voltage

Bypass

Danger of Oscillations

C7

0.1

µF

Frequency Stability

Dz

5.1V

Mute Circuit

Q1

BC107

Mute Circuit

APPLICATIONS SUGGESTION

(Demo Board Schematic)

The recommended values of the external compo-

nents are those shown on the demo board sche-

matic. Different values can be used: the following

table can help the designer.

MUTE, STAND-BY TRUTH TABLE

SW1

SW2

A

A

STAND-BY

A

B

STAND-BY

B

B

MUTE

B

A

PLAY

TDA7261

4/9