Project Profile Post - Project Description Suite

Project Profile Post (3P) is an open source XML base project description suite. It it helps authors to provide project descriptions and specifications to online sources in a standard way. 3P project description system is not limited for software projects, it can also applicable for any online project work which include electronic projects, arts, multimedia content, etc.

3PEd - Cross platform tool to edit 3P files

3P files can created through 3PEd. It is a GUI application and available for both Windows and Linux operating systems. 3P files can be open (view) through "3P Viewer". 3P Viewer is a GUI application and it is also available for both Windows and Linux operating systems.

Initially we create this file format and tools to manage our in-house digital contents and later we plan to release it to general public as a free and open source software product(s). 3P tools are available to download at 3P project page at sourceforge.net and it is distribute under the terms of MIT licenses.

In this general public release we add additional component to 3P tool chain and it is known as 3P API. 3P API is a software library to access 3P files. This library is available for both Windows (as DLL) and Linux (as SO) operating systems and it can be access through any programming/scripting language which support dynamically loadable libraries (e.g: C++, Delphi, C#, VB.net, etc.).

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CD2003 - yet another simple FM radio receiver

In the last few days, we are looking for some simple FM radio receiver to integrate into one of our ongoing projects. For that, we try several FM radio receiver ICs including TDA7000, CD2003/TA2003/TA8164, CXA1019, and KA22429. Out of all those chips we select CD2003 (or TA2003/TA8164) based receiver for our project because of its simplicity and outstanding performance. Except to CD2003, Sony CXA1019 also perform well but we drop it because of its higher component count. We design our receiver based on Toshiba TA2003 datasheet and later we try TA8164 and CD2003 with the same circuit. Either CD2003 or TA8164 can directly replace TA2003 IC, and as per our observations, TA8164 gives excellent results out of those 3 chips. A prototype version of CD2003 FM radio receiver The PCB design and schematic which we used in our prototype project are available to download at google drive (including pin-outs of crystal filters and inductors ). Except for CD2003 IC, this receiver consist...

Arduino superheterodyne receiver

In this project, we extend the shortwave superheterodyne receiver we developed a few years ago . Like the previous design, this receiver operates on the traditional superheterodyne principle. In this upgrade, we enhanced the local oscillator with Si5351 clock generator module and Arduino control circuit. Compared to the old design, this new receiver uses an improved version of an intermediate frequency amplifier with 3 I.F transformers. In this new design, we divide this receiver into several blocks, which include, mixer with a detector, a local oscillator, and an I.F amplifier. The I.F amplifier builds into one PCB. The filter stage, mixer, and detector stages place in another PCB. Prototype version of 455kHz I.F amplifier. In this prototype build, the Si5351 clock generator drives using an Arduino Uno board. With the given sketch, the user can tune and switch the shortwave meter bands using a rotary encoder. The supplied sketch support clock generation from 5205kHz (tuner f...

Calculator for audio output transformers

Audio output transformers are heavily used in a vacuum tube and some (older) transistor base audio power amplifiers, but these days output transformer are quite hard to find and expensive item. For homebrew projects, the best option is to construct those transformers by ourselves and this script helps to calculate winding parameters for those transformers. This " AF output transformer calculator " script is written using Python and it works with most of the commonly available Python interpreters . The script is available to download at google drive under the terms of GNU General Public License version 3.0 . Homebrewed 25k: 4 output transformer Once supplied the input parameters this script provides a winding ratio, the number of turns required for primary and secondary winding and required copper wire gauges for both primary and secondary windings, etc. We construct several AF output transformers based on results of this script, which including transformers for M...