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Last Twenty Electronics Projects

Contemporary Computer, Electronics and Science Projects choosen by our editors.
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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

Black Light

Black Light

This circuit is a simple ultraviolate light that can be powered by a 6 volt battery or power supply that is capable of supplying 1 or more amps.

Published: April 7th, 2010

Airflow monitor protects components

Airflow monitor protects components

Many electronic components, including fourth-generation UPs, require forced-air cooling. However, the reliability of electromechanical components, such as cooling fans, lags behind that of electronic devices. Even if a fan does not fail, blockage of the air-intake vents can reduce airflow. The circuit in Fig 1 helps you protect against high-temperature-induced system failures by monitoring the performance of the cooling system.

Published: April 7th, 2010

7 Segment LED Counter

7 Segment LED Counter

This simple counter can be used to count pulses, as the basis for a customer counter like you see at the doors of some stores,or for anything else that may be counted. The circuit accepts any TTL compatible logic signal, and can be expanded easily.

Published: April 7th, 2010

Rain Detector

Rain Detector

This circuit uses a sensor made of a small piece of etched PC board and a simple SCR circuit to detect rain and sound a buzzer. The SCR could also be used to activate a relay, turn on a lamp, or send a signal to a security system.

Published: April 7th, 2010

Build your own Arduino demo board

Build your own Arduino demo board

Also known by the name Polyphemus Demonastration and Evalution Kit this project became a compulsion that cost three complete redesigns, five destroyed ATmega168s, and hundreds of hours of point-to-point wiring. The result was Polyphemus,an ATmega168 demo kit that can be built from your own spare parts box.

Published: April 7th, 2010

Water Pump Relay Control

Water Pump Relay Control

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

Water Level Alert

Water Level Alert

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

DC-to-DC Converter

DC-to-DC Converter

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

DC to DC Boost Converter

DC to DC Boost Converter

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

How to Build an Antenna

How to Build an Antenna

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 Half Wave Dipole or Hertz Antenna

The Half Wave Dipole or Hertz Antenna

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

Digital Clock with MM5314N

Digital Clock with MM5314N

The digital clock of circuit, has as base one IC, the MM5314N, in which are contained all the circuits that need. The IC1 collaborates with six display of common anode, that are not critically as materials. You can select what dimension, you want it is enough you adapt pins their in the circuit. The display are drive by a system of polyplexis and are drive by thirteen transistors. For timing the circuit, is used the frequency of network 50HZ.

Published: May 25th, 2009

Tube Power Amplifier with EL34 - 35W

Tube Power Amplifier with EL34 - 35W

It is a classic designing of final amplifier 35 W, with two EL34 in push-pull, from the Siemens and Halske.

Published: May 25th, 2009

3 channel RF remote control

3 channel RF remote control

This is a 3 channel RF remote control project.The transmitter powered by 3V battery range about 10 m.This remote control I use PIC12F509 from Microchip which is a 8-pin single-chip microcontroller designed for low pin count applications with 1 K words flash memory and 41Byte SRAM and some special features such Power-saving Sleep mode,Wake-up from Sleep on pin change.

Published: May 21st, 2009