AVR based TDA7313 Audio processor control The idea of this TDA7313 based audio processor was to create a circuit capable to control all basic audio settings with the use of buttons and a LCD screen. When this idea realized, this board was born! We talk about this incredible 3 channel audio processor that is capable to control Volume, Bass, Tremble, Channel Select, Input gain for selected channel, LF speaker attenuation, RF speaker attenuation, LR speaker attenuation, RR speaker attenuation. It can be embedded on every audio system, the possibilities are endless. Video demostration comes next. A little talk about what TDA7313 offers: TDA7313 audio processor have been used for more than ten years in the industry because of its simplicity, functionality and good parameters like low distortion, low noise. Chip is based on BIPOLAR/CMOS technology and can be used in various applications including car radios, Hi-FI, simple mixers. TDA7313 chip has 3 external stereo inputs, that allows to multiplex three incoming sound sources, volume control with steps of 1.25dB, Treble and BASS control, Loudness function, Each of four outputs have distinct control that allows to balance outputs. Chip can be controlled via I2C (TWI) interface. USB 8bit Interface Board This is a USB (universal serial bus) interface board which can be used to connect 8 (parallel) data lines to the USB. The interface comes with a small internal FIFO (384 byte Tx, 128 bytes Rx) and 4 handshake lines which make it suitable for interfacing microcontroller designs to the USB. It can, also be used as simple 8bit IO when the so-called “bitbang mode” is enabled. Note. however, that in this mode, the bits will not come out in a constant bitrate but in chunks of 64 bytes with specified baud rate followed by a delay. Fostex FE167E Bass Reflex Speakers he very first pair of speakers I put together some thirty-eight years ago was a pair of single-driver loudspeakers using 8” Kaltro twin cone drivers. As I type this, I find myself once again listening to speakers using a single full-range driver. This time it is the 6.5” Fostex FE167E fullrange driver. I had recently completed a small low wattage 6T9 valve amplifier, and asked Gio for some suggestions on speakers to match the amp. He suggested the Fostex FE167E. When I saw they were 94dB efficient I ordered them instantly. Packaged with the drivers were two enclosure plans - a floor-standing unit as well as a bookshelf enclosure. I opted for the smaller bookshelf speaker box. The Fostex Recommended Standard Bass Reflex Type Enclosure is 15L with a 50 by 50 mm port that can exit from the front or rear. Send GPS data to your computer without a micSend GPS data to your corocontroller This project, complete with parts list, explains how to get GPS data into a Mac using a GPS module and a BlueSmirf Bluetooth chip, without any microcontroller. I agree with the maker who posts that a microcontroller would really just add cost to this project. Check out the details at the link below. Fuzzy logic guitar effects pedal Here’s a unique circuit for guitar effects builders. It uses readily available SIP sockets to allow easy transistor swapping. Experiment with different values for a personalized sound - and change it up on a whim. You can also recreate a bunch of popular pre-existing fuzz distortions with it: Some of the fuzzes you can make after building this layout are the Basic Fuzz Face (with R.G. Keen Mods, Roger Mayer Mods, Fuller Mods), the Vox Tone Bender 5/67, runoffgroove.com’s Sili-Faces, fuzzcentral.com’s Axis Face Germanium and Silicon, Joe Gagan’s Easy Face, Aron Nelson’s Hornet, the Gus Fuzz Face, Tim Escobedo’s Many Faces, the Boutique Fuzz, and the Miss Piggy. Guassmarkov’s site has some great tutorials on using op-amps and other basic electronic parts. There’s a boat-load of schematics, PCB images, and Eagle CAD files on there as well. [via] Music Equalizer Display Music equalizers are traditionally broken up into the different frequency ranges in order to “equalize” the sound that comes out. The equalizer display that we’ll make in this tutorial will just be based off of the straight music signal. An amplitude based equalizer isn’t terribly useful however it still looks cool =D and you’ll learn how to use the A/D converters on the pic. The audio signal we’ll use will be generated from a laptop then converted and understood by the pic. AVR based MP3 project Probably most of more experienced developer of embedded systems has built an mp3 player. It is not really hard as it may look like. It is because specialized mpeg decoder IC’s are used. It is all about using prebuilt libraries and some interfacing. This particular mp3 player is built around ATmega128 microcontroller that reads data from old 2.5″ laptop hard drive. MP3 player uses STA013 Mpeg decoder IC that sends decoded audio through CS4334 Stereo DAC (24-bit). Player software and hardware files are available for download. Check out for newer versions where various control interfaces like keypad; rotary encoder and remote IR are built. [via] PIC16F84A Nixie Clock A very compact nixie clock based on PIC16F84A and 74141 driver IC and MPSA92 high voltage transistors. Reading the data output from cheap digital verniers and scales The circuit make good use of the on-chip comparator in a single 12F675 PIC to detect the low level data and clock signals from the scales. The firmware reads both 24 bit binary and 7 digit BCD output scales types, can switch the scale to fast or slow reading, zero the scale display and outputs the data in an easily readable format at 115,200 Baud. Arduino Sound Part 3. Playing a Melody This is the third in a series of articles about generating sound with an Arduino. In this article we bit-bang our way through Jingle Bells . It’s almost Christmas so why not make a festive microcontroller project? If your not up to speed on making sound with the Arduino read the first two articles in this series. Arduino Sound Part 1 - Sound Generation Methods Arduino Sound Part 2 - Hello World |
CircuitBook.com (C) 2009
Any logo, trademark and project represented here are property of their respective owner