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Exciting Electronics, Computer and Science Projects

Free Projects for Professionals and Enthusiasts. New additions every week.
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Hi fidelity Homemade Loudspeaker

Hi fidelity Homemade Loudspeaker

The author made the speaker out of foam plate as the best quality of sound is produced by the materials that are lightweight but are strong enough to aviod excessive vibration. Paper plates are too soft and plastic disposable plates produce excessive vibration. So foam plates are best.

Published: April 9th, 2010

In-Circuit debugger

In-Circuit debugger

This project was sent by Electrical Engineer Atanasios Melimopoulos.In Circuit-Debuggers, as you may already know, have become the PIC’s debugging standard tool for many programmers because it’s easy use and handy interface to the target picplaced- board. They come with MPLAB plug-ins that provides a full rich set of commands and functions in order to debug your code in real time.

Published: April 9th, 2010

Simple Lie Detector

Simple Lie Detector

Here is a simple lie detector that can be built in a few minutes, but can be incredibly useful when you want to know if someone is really telling you the truth. It is not as sophisticated as the ones the professionals use, but it works. It works by measuring skin resistance, which goes down when you lie.

Published: April 8th, 2010

LASER Transmitter and Receiver

LASER Transmitter and Receiver

This set of two circuits from the basis for a very simple light wave transmitter. A LASER beam is modulated and then aimed at a receiver that demodulates the signal and then presents the information voice, data, etc.. The whole thing is very easy to build and requires no specialized parts execpt for the LASER itself.

Published: April 8th, 2010

A Really Tiny tiny Cylon

A Really Tiny tiny Cylon

Tiny Cylon is a small kit that creates 10 different LED flashing patterns with 5 red LEDs, an Atmel ATtiny13 microcontroller, and a 4.5VDC battery pack. In other words it’s an LED blinky PCB easy to assemble and easy to operate.

Published: April 8th, 2010

Cellular Phone calling Detector

Cellular Phone calling Detector

This circuit was designed to detect when a call is incoming in a cellular phone even when the calling tone of the device is switched off by means of a flashing LED.The device must be placed a few centimeters from the cellular phone, so its sensor coil L1 can detect the field emitted by the phone receiver during an incoming call.

Published: April 8th, 2010





Add a Rapid-Fire Button to Your Mouse Using a 555 Timer

Add a Rapid-Fire Button to Your Mouse Using a 555 Timer

Does your finger get tired easily while playing video games? Ever wish you could pwn n00bs faster than the speed of light without ever breaking a sweat? This will show you how.

Published: May 3rd, 2009

Silent Mouse The Second Encounter

Silent Mouse The Second Encounter

Neat HOW TO for keeping the mouse quieter if you have roommates . You can check recorded sound of clicking before and after. FYI, the sounds are of the Genius mouse, but the other one is dead silent too, Also the mouse buttons are now more sensitive, so you will get a few false clicks in the first couple of days, before you learn how to handle it.

Published: May 3rd, 2009

Interface MIDI Instruments to a PC Through a USB Port

Interface MIDI Instruments to a PC Through a USB Port

This Design Idea uses the FT232BM from Future Technology Devices International, a USB-to-UART interface IC that you need not program, to interface a USB port to the MIDI (musical- instrument-digital-interface) bus.

Published: May 3rd, 2009

Connecting your Computer to a Television

Connecting your Computer to a Television

It is a nasty surprise when you switch your monitor on and nothing appears on screen after a patient wait. Even though the resolution is much low, a television may help you to conduct basic procedures copying your files for example in such an emergency.

Published: May 3rd, 2009

Build Yourself a Fan Temperature Control

Build Yourself a Fan Temperature Control

Build yourself a temperature control with the following features -Temperature can be adjusted by the user. The desired temperature can be adjusted over a wide range, so the control is suitable both for regulating case temperature and CPU temperature. Fans are switched off if the temperature is low enough and several fans can be controlled with just one sensor and temperature control.

Published: April 9th, 2009

PC Output Interface

PC Output Interface

A versaile output interface that can control external devices direct from your computer. Uses freely available software and works with both windows and Linux.

Published: April 8th, 2009





Water Electrolysis

Water Electrolysis

Electricity is created when certain chemicals react together. We use chemically- made electricity to power many machines from flashlights to a watch or sometimes a car. Yes, there are cars that run on electricity! The devices that store electricity are called batteries. Electricity can also be used to produce chemical changes.

Published: November 25th, 2008

Electrolysis of Water

Electrolysis of Water

Adding some Sulfuric Acid as electrolyte will increase conductivity of water and creation of Hydrogen and Oxigen gases.

Published: November 25th, 2008

THERMO SIPHONING AND SIMPLE BATCH HEATER

THERMO SIPHONING AND SIMPLE BATCH HEATER

This simple batch heater is popular in many southern states where freezing is not a problem. It is used to preheat well water for a domestic hot water system, however it is not very efficient because of night heat loss.

Published: November 25th, 2008

Splitting Water - Electrolysis Experiment

Splitting Water - Electrolysis Experiment

Is it possible to break water? In a sense, that is what electrolysis does. Electrolysis uses electricity to split water into its two ingredients - hydrogen and oxygen. Try it out with a battery and a couple pencils.

Published: November 25th, 2008

Solar Greenhouse

Solar Greenhouse

Visible light from the sun turns into heat when it strikes the dark interior wall of the greenhouse. This heated air tends to rise and concentrate near the top of the greenhouse.

Published: November 25th, 2008

Hidden Messages - Goldenrod Pape

Hidden Messages - Goldenrod Pape

The term goldenrod is typically used to describe a color of paper - golden yellow. Certain brands of goldenrod paper contain a special dye that turns bright red in solutions that are basic like ammonia water or washing soda. The paper turns back yellow with an acid like vinegar or lemon juice.

Published: October 5th, 2008


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