Dilshan R Jayakody’s Web Log

This is high quality stereo digital audio amplifier with PLL synthesized FM radio receiver. Some of the high level specifications of this receiver are listed in below: Audio output power: 4W + 4W (with 8ohm speakers) Input sources: FM and 3 external stereo line inputs FM frequency range: 88.00MHz – 108.9MHz Supply voltage: 12V – 15V (2A current source is recommended) Tone control options: Bass, Treble and Loudness control Bass / Treble boost: 14dB Bass / Treble cut: 14dB Station memory: Preset 10 FM radio stations FM tune options: Auto and Manual with 25 kHz steps Key components of this audio system are ATmega32A - 8bit microcontroller, TT502 ( TEA5767 ) stereo FM radio module, PT2314 audio processor and μPC2002 audio power amplifier. This system is design to work with 12V - 15V (2A) DC power source and KA7632 multi-output regulator is used to manage power requirements to the above mentioned components. Prototype version of digital audio amplifier User interfa...

This is an Android application to send Morse code messages using tones or flash (light) signals. This application supports for basic Latin alphabet, Arabic numerals and it can transmit messages with specified speed which can vary from 100ms to 500ms. Main application view  This application is developed using Delphi XE5 and it supports for Android version 2.3.3 ( Gingerbread ) to 4.2 ( Jelly Beans ) except Android version 3.2 ( Honeycomb ). This application is specifically design for 3.4 inch - 5.0 inch Android smartphones and we tested this application with few Huawei , Samsung and HTC devices. Audio / Visual Morse code Generator is an open source software project and its source code is available at http://github.com/dilshan/signalman . Compiled package is available to download at http://github.com/dilshan/signalman/releases . This project is distributed under the terms of MIT license . Delphi Android compiler platform is still evolving and some bug can be expecte...

microTone Module is analog interface to connect microcontrollers or digital logic systems with PCs. This interface use PC sound card’s audio output terminal to send commands to external hardware systems. microTone Module is an open source project and all its software source codes and hardware designs are available to download at sourceforge.net/p/microtone . All the compiled software and source codes of this project are distributed under the terms of GNU Lesser General Public License . Hardware design and other documents are distributed under the terms of Creative Commons Attribution-ShareAlike 3.0 Unported License . Software library of microTone Module is a Win32 DLL and it can use with any programming language which allows interface with dynamic link libraries (e.g: C++ , C# , Python , Java , Delphi , Visual Basic , etc.) Some wrappers for this DLL are already implemented and available to download at microTone Module sourceforge.net code repository. And also if you implement or...