PHILIPS LX3900SA01
Service Manual

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Contains Circuit Diagrams
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PDF Format
Complete manual
Language: English

Price: $4.99

Description of PHILIPS LX3900SA01 Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

The manual is available in languages: English

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Text excerpt from page 32 (click to view)

8-1

8-1

6-channel class-D amplifier
Basic operation of a class-D amplifier Basically, the output stage of a class-D amplifier outputs a continuous square wave swinging between positive and negative power supplies with a fixed frequency (â��clockâ�� frequency) far beyond the audible range. The duty cycle of this square wave is modulated with the audio signal. The output is followed by a low-pass filter which eliminates the clock frequency and allows only the audio signal going to the speaker. See simplified drawing below.

AMPLIFIER BOARD

TABLE OF CONTENTS Class-D Amplifier circuit description ................................................. 8-1 Exploded view + mechanical parts ................................................... 8-2 Amplifier circuit .................................................................................. 8-3 Clock Generator & connector - circuit ............................................... 8-4 Bottom view ....................................................................................... 8-5 Top view ............................................................................................. 8-6 Bottom view Part A ............................................................................ 8-7 Bottom view Part B ............................................................................ 8-8 Top view Part C ................................................................................. 8-9 Top view Part D ............................................................................... 8-10 Electrical parts list - Amplifier board ............................................... 8-11 The main disadvantage of this concept is: â�¢ The amplifier is operating with a high-frequency square wave at high amplitude and currents. This requires special precautions to prevent excessive electromagnetic radiation (EMC). Compared to a conventional power amplifier the benefits of the Class-D amplifier are: â�¢ higher effiency â�¢ lower power dissipation â�¢ smaller heatsink required â�¢ smaller mains transformer required

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