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Simple Morse Code Trainer

Morse code contests are still held in some parts of the world. Practising the Morse code with a simple Morse key kit is interesting. The...

Smart Bicycle Light

JULY 2012: With this circuit built, boxed up and installed in your bicycle, you can look forward to safely riding your cool bicycle at...

Night Lamp From Scrap CFL

Compact fluorescent lamps (CFLs) are available in different shapes and power ratings. These consist of an electronic ballast circuit and a programmable-logic-controlled tubelight. Most...

Simple Stereo Power Amplifier With 7905

79xx is a widely known series of low-cost, fixed-negative-voltage regulators. These integrated circuits are available with output current of 100-150 mA (L series), 0.4-0.5A...

Smart Exhaust Fan Switch

Exhaust fans in washrooms can be connected to the lighting circuit so that these switch on and switch off with the electric light. But...

Multicolour Curtain Backlights

This circuit comprises two parts: a string of 5mm high-intensity white LEDs connected in series and the circuit wired around. IC CD4060 with an...

Clap-Based Digital Volume Control

This clap-based digital volume control offers four levels of volume control. With each clap, the volume of the audio system increases. After the fourth...

Simple Water Temperature Indicator

When bathing a baby, it’s important that the water is neither too cold nor too hot. You test the water by dipping your fingers...

Driveway Alarm

You can install this system in the driveway itself to detect intrusion by a vehicle, person or large animal. It sounds an alarm when...

Versatile DC-DC Converter

Here is a versatile power coupler that connects a device to 5V-19V DC generated from AC mains by a power adaptor. Power adaptors come...

Active Reflector for Pedestrian Safety

Pedestrians crossing roads in badly-lit areas, particularly at night or in the early morning, run a risk of accident. There are readymade arm bands...

Automatic Fan Controller For Air-conditioners

Many central air-conditioning systems (ACs) have the option for cooling and heating both. These have a fan for blowing hot or cold air drawn...

Security Alarm

Thwart any attempt of burglary in your house using this alarm circuit. When someone opens the door of your room, it sounds an alarm...

Dual-Tone Horn

This circuit generates two different frequencies and mixes these to produce a balanced ringing tone, which can be used in burglar alarms or call...

LAPTOP AUDIO AMPLIFIER

Usually, the audio output from a laptop’s built-in speakers is low. A power amplifier is required to get a high volume. Here is a...

DC Motor Control Using PWM

Small DC motors are efficiently controlled using pulse-width modulation (PWM) method. The circuit described here is built around an LM324 low-power quad-operational amplifier. Of...

SAFE CIGARETTE LIGHTER POWER SOCKET

Cigarette lighter sockets available on the dashboards of some vehicles act as a heat source to light cigarettes. Besides, these can power electronic gadgets...

Versatile Battery Charger

This transformer-based versatile battery charger circuit can be used to charge any battery, provided the transformer rating is higher than the battery rating. Normally,...
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