1.Lead Acid Battery Charger
2.Simple 78xx Current Booster
3.Simple Touch Switch
4.Two way Simple Small Telephone Exchange
5.Open GPS Tracker
6.USB Sound Card with PCM2702
7.PCB Exposure Box with countdown system
8.MCU controlled Bluetooth automation with IR Automatic Fan Controller
9.Low cost / Automatic Emergency Light
10.Simple FM Transmitter
11.230V Blinking LED
12.2500W Phase Control
13.MAX6953 Development board
14.IR Digital Thermostat for FAN
15.Simple Crystal Tester
16.12V Relay on 6V power supply
17.Transistor tester
....etc

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HEADPHONE AMPLIFIERS
INTRODUCTION
A headphone amplifier is a kind of audio amplifier designed particularly to drive headphones instead of loudspeakers. Most commonly they are found embedded in electronic devices such as integrated amplifiers, portable music players and televisions, but standalone units are not uncommon
Advantages
Its advantages are ...
• low output impedance to drive several pairs of phones
• the active gain stage is, almost, perfectly logarithmic and ...
– is independent of the a ....etc

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Using this low-cost project one can reproduce audio from TV without disturbing others. It does not use any wire connection between TV and headphones. In place of a pair of wires, it uses invisible infrared light to transmit audio signals from TV to headphones. Without using any lens, a range of up to 6 metres is possible. Range can be extended by using lenses and reflectors with IR sensors comprising transmitters and receivers. IR transmitter uses two-stage transistor amplifier to drive two series-connected IR LEDs. An audio output transformer ....etc

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The C6713™ DSK builds on TI's industry-leading line of low cost, easy-to-use DSP Starter Kit (DSK) development boards. The high-performance board features the TMS320C6713 floating-point DSP. Capable of performing 1350 million floating-point operations per second (MFLOPS), the C6713 DSP makes the C6713 DSK the most powerful DSK development board.
The DSK is USB port interfaced platform that allows to efficiently develop and test applications for the C6713. The DSK consists of a C6713-based printed circuit board that will serve as ....etc

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HEADPHONE AMPLIFIERS
INTRODUCTION
A headphone amplifier is a kind of audio amplifier designed particularly to drive headphones instead of loudspeakers. Most commonly they are found embedded in electronic devices such as integrated amplifiers, portable music players and televisions, but standalone units are not uncommon
Advantages
Its advantages are ...
• low output impedance to drive several pairs of phones
• the active gain stage is, almost, perfectly logarithmic and ...
– is independent of the a ....etc

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Introduction To Ham Radio Circuit Audio Filter

One of the earliest mode of radio communications is the use of Morse Code on a continuous wave carrier(CW) which is interrupted to generate a DIT and DAH in forming an alphabet. Though it looks simple, this method is often make less reliable as the surrounding man-made noise and atmospheric noise caused interference to the receiver station. This project will help to filter out the interference signal and ensure that the signal received from the Morse code station stand out.




Circuit Des ....etc

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hi...
i want the full details abt infrared cordless headphone including abstract........ urgent ....etc

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#include xyzcfg.h

#include dsk6713.h
#include dsk6713_aic23.h
#define beta 1E-12 //rate of convergence
#define N 30
short int adaptive_filter(short int ,short int );
float delay;
float w;


//union{unsigned int uint; short channel;} AIC23_data;

DSK6713_AIC23_Config config = {\
0x0017, /* 0 DSK6713_AIC23_LEFTINVOL Left line input channel volume */ \
0x0017, /* 1 DSK6713_AIC23_RIGHTINVOL Right line input channel volume */\
0x00d8, /* 2 DSK6713_AIC23_LEFTHPVOL Left channel hea ....etc

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1. GSM Controlled Door Latch Opener With Security Autodial-Up
2. Heat-Sensitive Switch
3. Solar Bug
4. Phone BroadCaster
5. Verification of Thevnin Theoren Trainar Kit
6. Liquid Level Alarm
7. Bidirectional Visitor Counter cum Power Management
8. Bus Bar Protection from Over Load
9. Stabilised Power Supply With Short-Circuit Indication
10. Electronic Candles
11. Implementation of image restoration.
12. Stepper Motor Conrol Using PC
13. Development Of Advanced Automated Railway Gate Control System
14. Automatic Temperature Contro ....etc

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SPYEAR


INTRODUCTION

1.1 SPYEAR:

With this sound amplifier, you can now hear things crystal clear that you could never hear before. Spy ear is very easy to use, just put the ear buds in your ears - aim the Spy Ear towards what you want to hear and things are heard crystal clear. Spy Ear has adjustable volume control, which amplifies sound up to 50 decibels. S ....etc

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Thinking of buying either A-110 or eGreat EG-M31B...
eGreat's SATA ports are a plus...
Most of my files are xvid and mkv.

Setup as of right now, is going to be:
NMT with 1TB HardDrive > HDMI > 1080pLCD monitor with headphone jack
LCD: Asus 22 VH226H

I'm just downloaded MediaInfo application, going through my media, what should i be looking for to see if i need DTS add-on board or not...

Thanks in advance!!
P.S.: my first post, hopefully right sub-forum... =)









--------------------------------------------------- ....etc

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#include xyzcfg.h

#include dsk6713.h
#include dsk6713_aic23.h

float filter_Coeff ={0.000000,-0.001591,-0.002423,0.000000,0.005728,
0.011139,0.010502,-0.000000,-0.018003,-0.033416,-0.031505,0.000000,
0.063010,0.144802,0.220534,0.262448,0.220534,0.144802,0.063010,0.000000,
-0.031505,-0.033416,-0.018003,-0.000000,0.010502,0.011139,0.005728,
0.000000,-0.002423,-0.001591,0.000000 };

static short in_buffer;

DSK6713_AIC23_Config config = {\
0x0017, /* 0 DSK6713_AIC23_LEFTINVOL Leftline input channel volume */\ ....etc

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INFRARED HEADPHONE

ABSTRACT

The circuit for INFRARED HEADPHONE is designed to demonstrate the transmission and reception of audio signal through ! infrared radiations. The infrared rays generated by the transmitter circuit are received by the receiver circuit after transmission through air. This communication is much more effective than ordinary communication. It helps to receive audio signals from any audio device like T.V,radio etc.
i
without disturbing others. It provides minimum transmission loss. It is a low ....etc

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#include
#include
short x;
void dft(short *x, short k, int *out); //function prototype
#define N 8 //number of data values
float pi = 3.1416;
int sumRe,sumIm;
short x = {1,2,3,4,5,6,7,8}; //1-cycle cosine
int out = {0,0};
int real,imag,k=0; //init Re and Im results
void dft(short *x, short k, int *out) //DFT function
{
int sumRe = 0, sumIm = 0; //init real/imag components
float cs = 0, sn = 0; //init cosine/sine components
int i = 0;
for (i = 0; i < N; i++) //for N-point DFT
{
cs = cos(2* ....etc

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INFRARED HEADPHONE

ABSTRACT

The circuit for INFRARED HEADPHONE is designed to demonstrate the transmission and reception of audio signal through ! infrared radiations. The infrared rays generated by the transmitter circuit are received by the receiver circuit after transmission through air. This communication is much more effective than ordinary communication. It helps to receive audio signals from any audio device like T.V,radio etc.
i
without disturbing others. It provides minimum transmission loss. It is a low ....etc

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