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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...

Remote-Controlled Firecracker Igniter for Safe Celebrations

Firecrackers are normally ignited by using a matchstick or a candle. You have to run away quickly after igniting the fuse of the firecracker....

Build a Flashing UFO Toy with Lights and Sound Effects

This unidentified flying object (UFO) is nothing but an electronic toy depicting the fantacy. It comprises three separate sections, viz, rim flasher, dome flasher...

Automatic Darkness-Controlled Lighting System

Make tubelights automatically switch on at night and switch off in daytime using this automatic control system. Automatic darkness-controlled lighting system means that whenever...

Contactless Telephone Ringer

This fully transistorised, simple circuit designed as a contactless telephone ringer provides an indication of incoming telephone call at a remote site like kitchen...

DIY Flashing Safety Light Circuit Using LEDs for Vehicles

During poor visibility, i.e., when there is fog, or at dawn or dusk, or when your vehicle gets stalled on a lonely stretch of...

Auto Muting Circuit During Phone Calls

Telephone conversation can be made disturbance-free using this simple circuit. As soon as you lift the telephone handset to converse, the TV, music system...

DIY Doorbell That Sounds Like a Parrot—No IC Required!

Here is a mains-operated door-bell that produces parrot-like sweet voice without requiring any musical IC. The circuit is cheap and easy to construct. The...

DIY: Replace Fridge Bulb with Energy-Efficient LED Lighting

The incandescent lamp provided inside the refrigerators glows whenever we open the door. It suffers from several disadvantages like: 1. Being a single light source,...

DIY Automatic Emergency Light Circuit with Auto Charging Feature

This emergency light has the following two advantages: 1. It turns on automatically when the mains power fails, so you need not search it in...

Simple Automatic Water-Level Controller

Water level controllers are common nowadays. The automatic water level controller described here is built around a timer NE555 and inverter buffer CMOS IC...

Simple High-Sensitivity Temperature Switch

This temperature switch has high sensitivity and is quite reliable. Here, in place of a single transistor, a Darlington pair has been used for...

Connect Two Telephones in Parallel with Intercom Functionality

The circuit presented here can be used for connecting two tele phones in parallel and also as a 2-line intercom. Usually a single telephone is...

DIY Extra Telephone Ringer with Visual and Audio Alerts

Many a times one needs an extra telephone ringer in an adjoining room to know if there is an incoming call. For example, if...

Build a 1-Second Tone Generator Using UJT for Darkroom or Metronome Use

The timer circuit described here provides a pleasant musical tone in your darkroom at 1-second intervals.The circuit takes up very little space and can...

DIY Electronic Horn Circuit

Here’s a simple circuit of an electronic horn that is built around quadruple op-amp IC LM3900 (IC1). IC LM3900 has four independent op-amps (A1...
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