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Solidstate Signal Lamp

This solidstate signal lamp is a good alternative to revolving mechanical signaling lamps used in ambulances. It uses ultra-bright blue LEDs for signaling. However,...

Parallel Telephone with Secrecy and Call Prevention

This parallel telephone circuit provides secrecy when two or more telephones are connected in parallel to a telephone line. The circuit also prevents incoming...

IR Remote Switch

Imagine the convenience of selecting TV channels using your remote and then pointing the same remote to your switchboard to switch on/off the fan...

PWM Based Speed Control for DC Motors

There are several methods for controlling the speed of DC motors. One simple method is to add series resistance using a rheostat. As considerable...

Number Guessing Game

This number guessing game is quite simple. In this game the player thinks of any number between 1 and 99. Then he scans the...

8 Digit Code Lock for Appliance Switching

This 8 digit code lock is useful for appliances requiring exclusive or authorised use by those who know the preset code. If desired, the...

Cellphone Controlled Audio/Video Mute Switch

The circuit automatically disconnects power supply to the audio/video system whenever the mobile handset is lifted off the holder for making or receiving a call.

Dome Lamp Dimmer

A reading light inside the car greatly assists passengers during night, but often the interior dome lamp is too bright and distracting to the...

Low Resistance Continuity Tester

Continuity testing is the act of testing the resistance between two points. If there is very low resistance (less than a few Ωs), the...

Sensitive Optical Burglar Alarm

Burglar alarms have become standard equipment in stores and other businesses, and they're becoming increasingly common in private homes as well. If you've ever...

Clap Operated Electronic Switch

Here’s a simple clap operated electronic switch. Using this switch, you can turn on any appliance by clapping five times and turn it off...

Touch Dimmer

By simply touching this touch dimmer you can increase the light intensity of incandescent lamps in three steps. The touch dimmer is built around...

Fuse cum Power Failure Indicator

Fuse blowing is a common problem, but is so tedious to go and check because every time it may not be blown. Here is...

Flashing Beacon

A flashing beacon has many uses. It can be employed as a distress signal on highways or as a direction pointer for parking lots,...

Automatic Headlight Switcher

Automatic headlamps are the latest convenience in today's cars. These eliminate the need for the driver to manually switch on or switch off the...

Automatic Parking Light For Cars

At night, parking lights make your parked car visible to motorists so they don’t smash into your car. However, these lights drain considerable power...

Anti-Theft Alarm

You can use this anti theft alarm circuit to thwart burglary. It sounds an alarm when someone tries to intrude into your home or...

Simple Intercom Circuit

This simple intercom circuit functions quite satisfactorily. The circuit does not involve any complicated switching. The switches S1/S2 must be fixed in such a...

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