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Electronic Glow-Worm

Here is a circuit that simulates the chirping and glow of a glow-worm bug. The circuit is built around timer IC 7555 (IC1), which...

Air Ioniser

This air ioniser is built around an NE555 timer IC which is configured in astable mode. The circuit is powered by a 12V battery, which...

Single Control Switch For Fan And AC

Here is an electronic switch that can be used to switch on both the air-conditioner as well as fan of your room, one by...

LED-Based Running Display

Here is a circuit that creates an eye-catching running display effect using LEDs. It can be used to light up borders of animations, pictures,...

PORTABLE SIGNAL WAND

Flashing lights have varied applications. For example, travelers can use these as warning beacons on highways to catch the attention of the public in...

Remote Phone-Bell Ringer

Did you ever miss an important telephone call simply because you were away where you couldn't hear the phone ringing? This should not happen...

9V Converter Using Two AA Cells

Normally, 9V PP3 batteries last less than a couple of hours if used continuously. These cannot be used if the voltage is below 7.8V....

Electronic Water Alarm

Aburst water-supply hose of the washing machine, a bathroom tap that you forgot to close, or a broken aquarium wall may turn your house...

Door-Opening Alarm

Children are at a high risk of drowning in a swimming pool. Majority of accidents occur when children get into a pool unsupervised. Such...

USB-Powered PC Lamp

This white LED lamp lets you use your PC or laptop at night without disturbing others’ sleep. It produces a soft white light just...

Car Reverse Horn

This car reverse horn can be used with any vehicle having a 12V battery. Transistors T2 and T3 form an astable multivibrator (AMV) that...

Automatic Bathroom Lamp

This simple circuit can be used as an automatic bathroom lamp controller. It disables the bathroom lamp at daytime and enables it at night....

Door Alert

This circuit can be operated by any kind of switch. For example, it can be used in a shop to warn that a customer...

Over-Temperature Alarm

This circuit can be used as a warning device which triggers an alarm whenever the temperature exceeds a preset level. It can also be...

Simple Alert Timer

This timer is a useful device for people who often forget to turn off devices in time. Suppose you want to boil water in...

Sound Sensor Alarm

This 6V battery-operated circuit triggers an acoustic piezobuzzer when a sound is detected. It can also be used as a cheap acoustic-type glass break...

Door Ajar Alert

Have you ever accidentally left your front door ajar and had a pet or your little kid escape? Here is a smart solution to...

TELEPHONE LINE IN-USE INDICATOR

This circuit gives a visual indication of whether a telephone line is in use or not, helping two or more people sharing the line...
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