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Decade Counter Based Flash Light
This decade counter based flash light circuit generates flashing lights in running pattern. In conventional running lights, the LEDs glow one by one. In this circuit, the LEDs flash a number of times...
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Phone Broadcaster
Here is a simple yet very useful phone broadcaster circuit which can be used to eavesdrop on a telephone conversation. The circuit can also be used as a wireless telephone amplifier. One important...
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Anti-Sleep Alarm
Most of the accidents on highways during night occur due to drivers’ poor vision caused by the continuous exposure of their eyes to the bright light from the headlamps of approaching vehicles. The poor...
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Fuel Reserve Indicator For Vehicles
Here is a simple fuel reserve indicator circuit for monitoring the fuel level in vehicles. It gives an audio-visual indication when the fuel level drops alarmingly below the reserve level, helping you...
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Battery Level Indicator
Normally, in mobile phones, the battery level is shown in dot or bar form. This lets you easily recognise the battery level. Here we present a battery level indicator circuit that lets you know the...
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5V from Portable Wind Turbine
This project deals with the design and development of a portable wind turbine unit, capable of generating electricity from the kinetic energy in the wind. The circuit requires a DC motor, fan blades or...
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Rechargeable Torch Based on White LED
Rechargeable torches don’t come without problems. You need to replace the bulbs and charge the batteries frequently. The average incandescent light-emitting diode (LED) based torch, for instance,...
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Audio Mixer with Multiple Controls
When recording sound from several orchestral instruments being played by different musicians using a single microphone, the only way to adjust the sound balance is to change the position of the...
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Automatic Water Pump Motor Controller
Municipal corporations in many cities supply water during early morning hours. So, you have to wake up early, just to switch on your motor pump and wait till your water tank is filled up. Further,...
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How to Assemble Your Own 3D Printer
3D printing, getting popular for making usable objects, is the reverse of traditional machining where material is removed from a block by drilling, cutting, chiseling, etc for making objects. In 3D...
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RF Signal Detector
This simple RF signal detector circuit can be used to trace the presence of RF signals and electromagnetic noise in your residential area, office or shop. It can be a useful tool while testing or...
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Accurate Electronic Stopwatch Project
A stopwatch is invaluable for events and time based competitions. And keeping in with today’s demand, these are available in very fancy designs and options. Presented here is a simple circuit which can...
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Colour Sensing Robot with MATLAB
A camera is one of the most powerful and accurate sensors if you know how to process the images taken by it for the information you want. You can process subsequent images and extract a variety of...
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Periodically On-Off Mosquito Repellent
Some of the mosquito repellent available in the market use a toxic liquid to generate poisonous vapours in order to repel mosquitoes out of the room. Due to the continuous release of poisonous vapours...
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Ethernet Interface for Automation Systems
Communication with remotely located automation systems is possible via the Internet. A physical communication port with a network is required for this communication. An Ethernet interface can be used...
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Water-level Controller
In most houses, water is first stored in an underground tank (UGT) and from there it is pumped up to the overhead tank (OHT) located on the roof. People generally switch on the pump when their taps go...
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Speed Control of DC Motor Using Pulse-Width Modulation
Pulse-width modulation (PWM) or duty-cycle variation methods are commonly used in speed control of DC motors. The duty cycle is defined as the percentage of digital ‘high’ to digital ‘low’ plus digital...
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Sunset Lamp
LDR-based automatic lights flicker due to the change in light intensity at dawn and dusk. So compact fluorescent lamps (CFLs) are unsuitable in such circuits as flickering may damage the electronic...
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Automatic School Bell
Consider that a school has a total of eight periods with a lunch break after the fourth period. Each period is 45 minutes long, while the duration of the lunch break is 30 minutes. To ring this...
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Smart Emergency Light
An emergency light can come in handy at all sorts of time, especially when there’s a power outage. Now you need not fear dark nights when power breaks down. Here’s a white LED-based smart emergency...
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