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18W Hi-Fi AMPLIFIER AND 35W DRIVER

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LINEAR INTEGRATED CIRCUIT

μC1

2.2 F

IN

ΩR1

22k

μC6

100 F

1

5

UTC2030 4

2

Ω 3 R3

22k

μC4

22 F

ΩR4

680

Vs+

C7

100nF

μ

ΩR8

1

ΩRL

8

ΩR7

22k

Vs-

μC2

100 F

1

ΩR2

22k

2

5

UTC2030 4

Ω 3 R5

22k

C3

100nF

μC5

22 F

ΩR6

680

μ

ΩR9

1

Fig. 16 Bridge amplifier with split power supply(Po=34W,Vs+=16V,Vs-=16V)

Multiway speaker systems and active boxes

Multiway loudspeaker systems provide the best possible acoustic performance since each loudspeaker is

speciailly designed and optimizied to handle a limited range of frequencies.Commonly,these loudspeaker systems

divide the audio spectrum two or three bands.

To maintain a flat frequency response over the Hi-Fi audio range the bands cobered by each loudspeaker must

overlap slightly.Imbalance between the loudspeakers produces unacceptable results therefore it is important to

ensure that each unit generates the correct amount of acoustic energy for its segmento of the audio spectrum.In

this respect it is also important to know the energy distribution of the music spectrum to determine the cutoff

frequencies of the crossover filters(see Fig. 18).As an example,1 100W three-way system with crossover

frequencies of 400Hz and 3khz would require 50W for tthe woofer,35W for the midrange unit and 15W for the

tweeter.

Both active and passive filters can be used for crossovers but active filters cost significantly less than a good

passive filter using aircored inductors and non-electrolytic capacitors.In addition active filters do not suffer from the

typical defects of passive filters:

--Power less;

--Increased impedance seen by the loudspeaker(lower damping)

--Difficuty of precise design due to variable loudspeaker impedance.

YOUWANG ELECTRONICS CO.LTD

8

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