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We are on Third Year!

We are very glad to inform to all the users of this website that we have successfully completed two years serving the electronics students all over the world. We would like to thank to all the users that we have been a part of it. We expect that in coming future more and more users will be benefited from this website. We promise that we are devoted to update the information timely and provide you all more information of new discoveries in electronics.

Happy New Year 2010

On the behalf of elxproject.com team I would like to express my warm wish of New Year 2010 for you all our visitors and valuable members. Hope this year brings you all the exciting success in your life.

Happy New Year 2010

Dual Band Mobile Jammer for GSM 900 & GSM 1800

Communication jamming devices were first developed and used by military. This interest comes from the fundamental objective of denying the successful transport of information from the sender (tactical commanders) to the receiver (the army personnel), and vice-versa. Nowadays, mobile (or cell) phones are becoming essential tools in our daily life.

FM Transmitter Circuit

This circuit is a simple two transistor (2N2222) FM transmitter. No license is required for this transmitter according to FCC regulations regarding wireless microphones. If powered by a 9 volt battery and used with an antenna no longer than 12 inches, the transmitter will be within the FCC limits.

5x5x5 LED Matrix CUBE Controller

You might have seen many videos around you tube showing off crazy LED cubes, forming 3-D structures etc. But haven't find anything that explains how this is being done. Well searching over internet i found this great project made using a PIC 16F688 microcontroller used to control a 5x5x5 LED matrix cube.

The LED cube is made up from 125 LEDs arranged into 5 layers of 25 LEDs each. The display itself is multiplexed so instead of requiring 125 connections it requires one to each of the five layers and 25 to each LED in a layer making a total of 30. The cube is refreshed by a software interrupt routine with each layer active for 2ms, so the entire cube is refreshed every 10mS (100Hz). This results in a display with no visible flicker.

Only 8 I/O lines are needed to control the LED drivers for the cube which allows a tiny 14 pin PIC 16F688 microcontroller to control the whole cube. This micro has an internal 8Mhz clock and 4Kwords of program memory.

The complete circuit can be download in pdf format here: schematic
Firmware Download: LED Cube Matrix Driver
You can find more interesting videos and ready to burn hex file here: LED CUBE Controller

Artificial Plate Battery

Plate batteries for old tube radios are today only available with difficulty. However, step-up controllers for low DC voltages are everywhere. The circuits of these IC’s are, however, affected by disadvantages and complex wound inductance are needed. A further disadvantage of this solution is the transducer frequency; poor placing can cause audible interference.

Plant Watering Watcher

This circuit is intended to signal when a plant needs water. A LED flashes at a low rate when the ground in the flower-pot is too dry, turning off when the moisture level is increasing. Adjusting R2 will allow the user to adapt the sensitivity of the circuit for different grounds, pots and probe types.

Smart Trailing Socket

This circuit consists of a Trailing Socket (also called Extension or Distribution Socket) or similar device where two, three or more sockets (depending on the box dimensions and on constructor's needs) will be powered only when a current flows in the Control Socket.

Fridge door Alarm

This circuit, enclosed into a small box, is placed in the fridge near the lamp (if any) or the opening. With the door closed the interior of the fridge is in the dark, the photo resistor R2 presents a high resistance (>200K) thus clamping IC1 by holding pin 12 high.

Precision Metronome & Pitch generator

Volume regulation of the pitch generator is obtained trimming resistor R5. In the same way, with SW5 set to metronome, the small speaker reproduces the frequency set by thumbwheel switches but divided by 3840, thus obtaining beats per minute ratio.

Compact DJ Station

This project consists of a small, portable DJ mixer powered by a 9V dc external supply adaptor or from a 9V PP3 battery.
The mixer features two stereo phono inputs and two stereo line-level inputs and has one stereo mixing channel. A microphone input and a stereo main output with adjustable gain are also provided.