Dilshan R Jayakody’s Web Log

This is a "quick design" to make surround sound dock for Apple iPod, iPhone and iPad devices. This audio docking module contains analog surround sound processor, bass booster and electronic mode switch. Main components of this surround sound dock are LA2610 - analog surround sound processor and ATTiny13 - 8bit MCU. This unit is design to work with 9V external DC power supply and it can deliver maximum of 2 × 1W audio output power. Printed Circuit Board Design of Surround Sound Dock In prototyping stage we test this system with couple of Apple iPod and iPad devices with 4inch full range 8Ω speakers. This system can also drive professional headphone through its " Ext. Output " connector. This system need 160mm × 100mm double side PCB and it is specifically design for vertical docking chassis. This project is an open source hardware project and its design and other related materials are distributed under the terms of Creative Commons - Attribution...

In this project we design miniature stereo computer speaker driver using TDA2822 power amplifier IC. Main goal of this project is to design small stereo power amplifier which may be able to fix inside the small speaker boxes. Supplied PCB of this project has dimensions of 4.5cm × 4.5cm, which include both power amplifier and PSU. Some of important technical specifications of this project are listed in below, Recommended Supplied Voltage : 5V – 9V AC Output Power : (with 8Ω load and 7.5V AC Power Source) : 2 × 1W Voltage Gain (with feedback) at 1kHz input signal : 38.5dB Total Harmonic Distortion : (with 8Ω load and P 0 = 150mW) 0.2% Channel Separation : 50dB When wiring the project it is recommended to place screen-wires to the input terminals of amplifier and keep them separate (away) from AC power lines and transformer unit(s). It is not necessary to install heatsinks to TDA2822M IC (with given input and output parameters). Complete schematic, PCB design and documen...