Dilshan R Jayakody’s Web Log

In one of my project I need to access PC hardware ports using PHP. Standard distribution of PHP (PHP for Windows) may not have facilities to access PC/Server hardware ports, and finally I developed lightweight PHP extension to access server hardware ports. Current version of PHPhD (version 1.0.0.20) support for PHP 5.2.x (tested with PHP 5.2.1) and distributed under the terms and conditions of Mozilla Public License version 1.1. This PHP extension is available to download at http://elect.wikispaces.com/Downloads Using PHPhD users can access server hardware ports with minimum amount of coding and complexity. Example PHP source code which was based on PHPhD is listed in below, //Initialize and open hardware device driver if(!phphd_open_driver()) { die("Unable to open PHP hardware port access device driver"); } //read printer (LPT) port and get the curent port value $lpt_port_val = phphd_read_port(0x378+1); echo("LPT port value [0x378+1] : ". $lpt_po...

In this project we build CXA1619BS base high performance FM stereo radio receiver using low cost and readily available electronic components. In this design we use CXA1619 as FM radio receiver and BA1320 as FM stereo decoder and LA4108 as power amplifier. When building the circuit it is highly recommended to build it using the print circuit board (PCB) and take some necessary steps to reduce the effects of external interferences. In this design we use BA1320 as stereo decode and user can also use BA1330 with this circuit with some less amount of input voltage. (For example: +5V) We use BA1320 for this design because of its low cost, low complexity, higher channel separation and higher availability. In current design we use LA4108 as power amplifier and it delivers 6W x 2 output power at 8ohm load. While assembling the circuit make sure to apply suitable heat-sinks to both 7805 voltage regulator and LA4108 power amplifier. At the testing stages this circuit produces excellen...