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

These days many verities of alarm systems are available in the market. Some of them get triggered through touch and some type where a wire needs to broken to get triggered.  Both of these types of alarms have some limitations and problems. Wire based alarms are easily avoidable, noticeable and need some regular maintenance. Touch type alarms often pickup RF waves and get activated (because of that it need some controlled environment to function properly). In this project we design and develop LASER based burglar alarm system. Instead of wire(s) this system use LASER light wave and it can effective for more than 50m. Core features of this alarm system are: High audio output power (Max. 3W PMPO) Master light override switch Inbuilt alarm test functionality Memorized power state Quick response time (aprox. 10ms ~ 30ms) Support for wide input voltage range (15V – 25V DC) Easy to build and calibrate Compact size (aprox. 130 × 200 × 60mm) This alarm system is specifically desi