TDA2030A

LINEAR INTEGRATED CIRCUIT

10

The components values calculated for fc=900Hz using a Bessel 3rd Sallen and Key structure are:

C1=C2=C3=22nF,R1=8.2K

W,R2=5.6KW,R3=33KW.

Using this type of crossover filter, a complete 3-way 60W active loudspeaker system is shown in Fig. 20.

It employs 2nd order Buttherworth filter with the crossover frequencies equal to 300Hz and 3kHz.

The midrange section consistors of two filters a high pass circuit followed by a low pass network. With Vs=36V

the

output power delivered to the woofer is 25W at d=0.06%( 30W at d=0.5%).The power delivered to the midrange and

the tweeter can be optimized in the design phase taking in account the loudspeaker efficiency and impedance(RL=4 W

to 8W).

It is quite common that midrange and tweeter speakers have an efficiency 3dB higher than woofers.

1

2

5

4

3

Contek

TDA2030A

1

2

5

4

3

Contek

TDA2030A

1

2

5

4

3

Contek

TDA2030A

100 mF

1 mF

0.1 mF

0.1 mF

0.22 mF

Vs+

100 mF

0.22 mF

0.1 mF

0.1 mF

47 mF

100 mF

220 mF

2200 mF

BD908

BD907

22k W

22k W

22k W

22k W

2.2k W

Vs+

1N4001

1N4001

1N4001

2.2k W

Vs+

Vs+

IN

Woofer

Midrange

Tweeter

High-pass

3kHz

High-pass

3kHz

Band-pass

300Hz to 3kHz

Low-pass

300Hz

1N4001

CONTEK

Contek Microelectronics Co.,Ltd.

http://www.contek-ic.com E-mail:sales@contek-ic.com