Powerful MP3 player in a mint box There are quite many MP3 player projects done by enthusiasts. So here is another one which works with compact flash cards, handles FAT16 and fits in Altoids mint box. Player runs on PIC18LF452 microcontroller which handles flash card interface and sends data to STA013 MP3 decoder chip. Decoded digital audio is converted to analog by CS4340 DAC. The project is running from 3.3V LiIon battery. MP3 player also has a MAX756 DC boost regulator that allows using different batteries like couple AA Alkaline. In order to get rid of cables there is an optional FM transmitter MAX2606 to play music via car radio receiver. And last shot is USB connectivity, so it is possible to upload/download files and even charge LiIon battery via MAX1811. Latest project files can be downloaded form here. [via] Audio VU meter 9 leds 5 LED VU Meter kit is based on LB1409 IC from SANYO, which will indicates the volume level of the audio signal it senses * SUPPLY 12V DC @ 50mA * PR1 REF SET * PR2 AUDIO LEVEL SET Amp6 T-Amp: DIY Class-T Kit The AMP6 is a small amplifier that uses the Tripath TA2020 chip and includes an onboard regulated power supply . The manufacturer, Tripath Technology, Inc. describes Class-T amplifiers as offering both the audio fidelity of Class-AB and the power efficiency of Class-D amplifiers. DIY LED Heart We live in the information age. Your phone knows where you like to eat, computer programs know what movies you like better than you do, and going to a party can mean going in this life, or a Second Life. So why is your message of love still stuck in the 16th century? These days it takes more than a sonnet to melt a girl’s heart. This video tutorial shows step-by-step how to make a Valentine’s Day card for the digital age. The NerdKits team shows how to make an LED Heart Valentine’s card powered by a microcontroller. The heart features an LCD screen for a personalized message, and 20 LEDs around the perimeter that can be programmed to show any pattern. The code provided contains a “twinkle” function that randomizes the process to provide a true star-like twinkle. LED Desktop Clock This project uses RGB LEDs to create a clock face. Each hand is assigned a colour and as the hands overlap on the face of the clock it mixes the colours. The clock uses a single AA battery to power the display which is boosted to 5 volts with a switching mode power supply. The power supply should be able to use any AA battery that is at 0.7 volts or higher, which means that it should still work fine with AA batteries that may be “dead” when used in other devices. The heart of the clock is a DS1307 realtime clock with a CR2032 coin cell battery backup. The battery should be sufficient to keep the time for at least a couple of years. RS232 to SPI Interface This project is a Microchip PIC microcontroller with an RS232 serial interface on one side and an SPI interface on the other. The SPI interface uses the SSP port on a 16F819 device. By sending commands on the RS232 interface it is possible to send any sequence of bytes on the SPI interface from the PIC. These can enable or disable the chip select and read, write or exchange a sequence of bytes. 200W Audio Amplifier This complete high quality, low noise mono audio power amplifier is based around the Hybrid Integrated Circuit STK4050 manufactured by Sanyo. The circuit incorporates volume and has a maximum music output power of 200W.The circuit incorporates an on board power supply; therefore, only centre tapped transformer is required to power the circuit. I t has very good quality sound. U can use it with your Home Theatre your PC & etc… You can also use it as Subwoofer Amplifier. It is a compact package for THIN-TYPE Audio sets. Easy Heatsink design to disperse heat generated in THIN-TYPE audio sets. Constant-Current circuit to Reduce supply switch-ON and switch-OFF shock noise. External supply switch-On and switch-OFF shock noise muting, Load short-circuit protection, thermal shutdown and other circuits can be tailored-designed. Squaremin - Theremin Style Instrument Theremin Style Instrument: This battery powered electronic musical instrument is a descendant of the theremin and can be played without contact from the musician. This easily - assembled, small instrument contains two infared (IR) sensors, one controlling the note, with the other controlling the octave that is played through the speaker in the front. There are seven possible notes (c-b) and 7 possible octaves of each note. The tone is reflected by one of seven colors that illuminates the center area and highlights a small indicator located on the top panel. The brain of this piece is a boot-loaded atmega chip. The source code is available, as well as, pictures and a video. Check it out here: GPS-based universal clock generator Almost all commercially available GPS OEM modules provide a 1pps output, synchronized with GPS time. This pulse could be used as a reference to generate accurate high-frequency clocks, but special design has to address the short-term jitter affecting the 1pps signal. As a general guideline, an oven-stabilized crystal oscillator who guarantees the short-term stability is synchronized with the GPS 1pps for the long-term accuracy. [Youtube] Speech recognition using FPGA![[Youtube] Speech recognition using FPGA](img/73.jpg) This is a video demonstration of simple speech recognition using FPGA. The video features a simple speech recognition algorithm implemented on an Altera DE2 board. This was part of a design project course in electrical engineering at McGill University. |
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