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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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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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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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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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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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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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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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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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