By means of a Relay, employed to drive a water pump, this circuit provides automatic level control of a water reservoir or well.
Published: May 25th, 2009
This circuit will emit an intermittent beep or will flash a LED when the water contained into a recipient has reached the desired level. If a deeper sensing level is needed, the clips can be extended by means of two pieces of stiff wire.
Published: May 25th, 2009
This DC to DC converter is built by the author for his 48V electric bike because he wanted to plug-in some common 12V accessories, that is, his cellphone charger, or a GPS unit.
Published: May 25th, 2009
Learn how to build an efficient boost converter to provide high voltage from a lower voltage greater than 5V for several applications, most prominently to charge capacitors. The boost converter described here utilizes the Astable operation of the NE555 a timer Integrated Circuit, an IGBT, a Diode, and an Inductor coil of wire.
Published: May 25th, 2009
An antenna is an electromagnetic device that collects or emits radio waves. It consists of material that conducts electricity arranged in such a way that it is in tune with the frequency of a radio signal. Like a tuning fork in the presence of a sound of the same pitch, an antenna tuned to a particular frequency will resonate to a radio signal of the same frequency.
Published: May 25th, 2009
The dipole antenna dates back to the early RF experiments of Heinrich Hertz in the late 19th century. It consists of a conductor that is broken in the center so that RF power can be applied to it. One can think of the half wave dipole as an open circuited transmission line that has been spread out, so that the transmission line can radiate a signal into space.
Published: May 25th, 2009
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
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
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
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 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
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
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
Adding some Sulfuric Acid as electrolyte will increase conductivity of water and creation of Hydrogen and Oxigen gases.
Published: November 25th, 2008
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
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
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
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
