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Doorbell-controlled Security Switch

One way to check whether anybody is at home is to ring the doorbell. Burglars too use this very technique. The circuit described here...

TELEPHONE CALL RECORDER

Today telephone has become an integral part of our lives. It is the most widely used communication device in the world. Owing to its...

Smart Loop Burglar Alarm

Simple loop burglar alarms sound whenever the loop breaks. What if a clever thief comes to know of the working of this alarm? He...

CAR-REVERSING HORN WITH FLASHER

Here is a simple circuit that starts playing the car horn whenever your car is in reverse gear. The circuit (refer Fig. 1) employs...

Stereo Headphone Amplifier

Here is an inexpensive circuit for a stereo amplifier to drive a low-impedance headphone set. The circuit uses a few cheap transistors (BC547 and...

Whisker for Robots

Whiskers for robots are simple switch-type sensors that work like an animal’s whiskers detecting nearby objects in the environment. When disturbed, the sensor sends...

KNOCK ALARM

This circuit (Fig. 1), used in conjunction with a thin piezoelectric plate,senses the vibration generated on knocking a surface (such as a door or...

Night Lamps

Here are two night lamp circuits using LEDs. One could be used as a night-vision clock and the other as a TV lamp. Both...

Musical Water Shower

Won’t it be nice to have music playing in the background all the while when you take a shower? This simple circuit does the...

Traffic Baton

In small towns, there are no traffic lights and the police regulate the traffic with hand signals. Since their hand signals may not be...

Traffic Controller

This simple traffic controller can be used to teach children rudiments of traffic rules. The circuit (shown in Fig. 1) uses readily available components. It...

Hot-Water-Ready Alarm

Electric kettles turn off automatically when water has boiled. What if the boiler beeps to alert you when your water has boiled? The tripping...

DIY Touch Alarm

This is a new type of touch alarm that uses an RF oscillator at its input. One special feature of this touch alarm is...

DIY Electronic Heart

With this electronic heart glowing on and off, you are sure to steal the heart of that special someone. The circuit uses an NE555...

CAR ANTI-THEFT GUARD

Here is an easy-to-build car anti-theft guard. The circuit, shown in Fig. 1, is simple and easy to understand. When key-operated switch S2 of...

MOBILE BUG

This handy, pocket-size mobile transmission detector (Mobile Bug) can sense the presence of an activated mobile phone from a distance of one and a-half...

Line-Powered Two-Tone Ringer

Need often arises for having an extra telephone ringer in another room to alert you of an incoming call. A low-cost, 2-tone ringer IC...

DIY Laptop Theft Alarm

Protect your valuable laptop against theft using this miniature alarm generator. Fixed inside the laptop case, it will sound a loud alarm when someone...
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