Summary of LM3886 TDA7318 DIGITAL AMPLIFIER AT90S8535
This article describes a fully digital audio amplifier system centered around the AT90S8535 microcontroller. The project integrates a high-quality power stage using the LM3886, a preamplifier based on the TDA7318 with I2C control, and a Philips OM5610 tuner. The system features an LCD display, RC-5 remote control support, and keyboard input, all managed by the AVR processor using BASCOM-AVR software. Components include metal resistors and WIMA capacitors for superior audio performance, delivering approximately 50W per channel into an 8 Ohm load.
Parts used in the Digital Amplifier:
- AT90S8535 Microcontroller
- LM3886 Integrated Amplifier
- TDA7318 Preamplifier IC
- Philips OM5610 Digital Tuner
- Metal Resistors
- WIMA Film Capacitors
- Toroidal Transformer (150W)
- Capacitors (40,000uF total capacity)
- LCD Alphanumeric Display (16 * 1)
- RC-5 Remote Control (MAK 2002 Maxi)
- BASCOM-AVR Compiler Software
AT90S8535, TDA7318 and LM3886 have been realized with digital amp system LED Indicator-signal input selection can be made, unfortunately explanations could not solve in a language 🙂 but ATMEL microcontroller dealing with people a… Electronics Projects, LM3886 TDA7318 Digital Amplifier AT90S8535 “audio amplifier circuits, avr project, ic amplifier, lm3886 amplifier circuit, microcontroller projects, “
AT90S8535, TDA7318 and LM3886 have been realized with digital amp system LED Indicator-signal input selection can be made, unfortunately explanations could not solve in a language 🙂 but ATMEL microcontroller dealing with people a good source AT90S8535 source for. Bas code all schematic documents have a project 4 found out occurs cpu preanf border amp and power are no longer the classic LM3886 integrated Amplifier Used in the appropriate price of an integrated high-quality, easy to install 🙂
DIGITAL AMPLIFIER
The amplifier is controlled completely digitally . Used items are of high quality such as metal resistors in the audio , WIMA film capacitors … The power stage is the LM3886 systems . These are some of the best integrated amplifiers . The structure is typical of the system . The amplifier should reach about 50W per channel 🙂 8 Ohm load .
The amplifier is powered from a power supply built toroidal transformer ( 150W ) and capacitors with a total capacity of 40 000uF . Next to it is a smaller power supply from the power of the digital preamp and tuner. The preamplifier circuit is based on the TDA7318 . This system also has a very good audio quality ( low distortion , noise , high dynamic ) . It has an internal control and input selector is through the I2C bus ! Control includes strengthening and sound.
The tuner is built in this module PHILIPS OM5610 . It is a complete digitally tuned tuner . It does not require any adjustment and is about the size of a matchbox ! The only drawback is its relatively high price , but thanks to him, tuner design has become very simple.
All these management ATMEL microcontroller . AT90S8535 processor belongs to the family of AVR . It has 8kB Flash memory , 512 bytes of EEPROM , 512 bytes SRAM , hardware PWM Real Time Clock and many more … And most importantly can be programmed in the system through ISP connector . Control is via keyboard and recycling .
All important information is displayed on the LCD alphanumeric display (16 * 1) . The amplifier is of course as a remote control RC- 5 (MAK 2002 Maxi ) .
The driver is written in BASCOM – AVR . This is an excellent compiler , which allows even less experienced developers to quickly write a very impressive program!
This language has a number of commands for the use of the many features AVR . It is ready handler : I2C , RC -5 , 1WIRE , LCD, RTC , SPI, WDT , PWM and more … Unfortunately, the use of this compiler associated with a substantial increase in the volume of the generated code. For this reason, the program has only basic functions such as the tuner has not been added RDS -u . But there is nothing in the way to add it to the system such as SAA 6588 ( controlled by I2C ) .
The amplifier has 3 inputs + tuner inside 😉 input for CD is initially slightly suppressed. The other zones do not have silencers . The signal from the tuner is amplified by 12.5 dB in the internal TDA7318 amplifier . Each input has a separate adjustable gain, bass and treble .
The receiver is a 9 channel memory cells . Step synthesis tuning station is 12kHz , and adjustment range is between 87.5 – 108MHz .
Source: DIGITAL AMPLIFIER AT90S8535 LM3886 TDA7318 Digital Amplifier AT90S8535 files lm3886-tda7318-digital-amplifier-at90s8535.RAR
- How is the amplifier controlled?
The amplifier is controlled completely digitally by an ATMEL AT90S8535 microprocessor via a keyboard and remote control. - What is the power output of the amplifier?
The amplifier reaches about 50W per channel when connected to an 8 Ohm load. - Can signal input selection be made manually?
Yes, signal input selection can be made, and the system includes an internal tuner plus three external inputs. - Does the preamplifier use I2C bus for control?
Yes, the preamplifier circuit uses the TDA7318 which has an internal control and input selector through the I2C bus. - What programming language was used for the driver?
The driver was written in BASCOM-AVR, an excellent compiler that allows developers to quickly write programs for AVR features. - Is the tuner adjustable or automatic?
The tuner is built-in and does not require any adjustment; it is a complete digitally tuned unit. - What type of capacitors are used in the audio path?
High-quality WIMA film capacitors are used in the audio section along with metal resistors. - How many memory cells does the receiver have?
The receiver consists of 9 channel memory cells for storing stations. - What is the tuning range of the tuner?
The adjustment range is between 87.5 and 108MHz with a step synthesis tuning station of 12kHz. - Can RDS functionality be added to the system?
RDS functionality was not added due to code volume limits, but nothing prevents adding it via an SAA 6588 chip.
