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Stereo Pre-amplifier System with Digital Control

Kayıt: 12 Ksm 2006
Mesajlar: 26
Konum: Kâlû Belâ
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Tarih: 22 06 2008 11:22

Stereo Power Amplifier / Pre-amplifier with 350mW output at 8 ohms
Digital Volume control
Digital Treble and Bass control
Stereo or Mono operation selectable
Stereo Enhance Mode, 3D Sound
Software Muting
Dual 7-segment LED display
Manual pushbutton control
Infrared Remote Control (SIRC)

Stereo Pre-amplifier System with Digital Control
Alıntı:

The LM4832 is controlled by the PIC16F628(A), pre-programmed microcontroller (MCU). The Microchip PIC16F628(A) is selected due to its low-cost and easy code migration to other mid-range or 16F series PIC microcontrollers. In Circuit se-ri-@l Programming (ICSP) is implemented for the development of this project. The Microchip ICD2 is used to program the PIC16F628A chip. No external oscillator is required in the design. Its internal oscillator is good enough to read the se-ri-@l port at 9600 Bps and perform other se-ri-@l and I2C data transfer function.

The PIC16F628(A) controls the LM4832 chip using an I2C interface. With the I2C interface, 30 steps of Volume can be implemented with 2dB/step resolution. Tone control functions are also built-in, with +/- 12dB control on both Bass & Treble. There are 12 steps of tone control with 2dB resolution. User can also force the amplifier to function in both “Mono” and “Stereo” operation mode. The LM4832 has also a National 3D sound which enhances the stereo channel to optimize stereo channel separation, when the speakers are placed too near to each other.

During system power up, the microcontroller will read its internal EEPROM for Volume, Tone and other setting parameters. Later, the 2-digit 7-segment display will perform a blank test, to visibly check for faulty LED segments. The volume settings will be displayed after that. By default, the amplifier is un-muted.

Now, the system is ready to accept user input, weather it is from a remote control or keypad. With the remote control interface, user could control the [Volume-], [Volume+], [Bass-], [Bass+], [Treble-], [Treble+], [Stereo/Mono operation], [Stereo Enhance On/Off] and [Mute] functions. However, due to limitation to eight buttons (using only one 74HC165) for keypad, the Mute function is omitted. Every time user changes the settings, the program will save the updated data into its internal EEPROM, so that the data can be retrieved at later times if the system is turned off then on again.

When the user pushes the remote control or keypad, the 7-segment will display the respective settings for the current changing value. Let’s say when user pushes the [Bass+] button, the Bass setting will be incremented, and the 7-segment display will blink once, to indicate acceptance of an input. The 7-segment display will now display the Bass settings. If there are no changes or activity on changing the Bass settings for approximately 2 seconds, the display will display back the default Volume settings. The same operation applies when changing the Treble settings.

Note: With additional LM4832 chip, the Center channel and subwoofer output can be controlled using the IR remote control. The second LM4832 chip (address 0x02) is configured as mono operation, with independent Left and Right channel control. This enables both Center channel (LEFT) and Subwoofer Output (RIGHT) to have 30 steps of volume control.


Stereo Pre-amplifier System with Digital Control
Stereo Pre-amplifier System with Digital Control
Stereo Pre-amplifier System with Digital Control


Schematic Diagram (.GIF)
Schematic Diagram (.PDF)
IRC-80S Datasheet
LM4832 Datasheet
PIC16F628A Datasheet

alıntı : http://eedesign.netfirms.com/index.html


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Stereo Pre-amplifier System with Digital Control


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