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RADIO/AUDIO FREQUENCY GENERATOR CUM BFO

This radio-cum-audio frequency signal generator can also be used as a beat frequency oscillator (BFO) for continuous-wave and single-sideband signals. Fig. 1 shows the circuit...

Pull-Pin Security Alarm

Here is a simple and low-cost circuit of pull-pin security alarm. While travelling, rig the alarm unit to your luggage using a home-made security...

Electronic Electroscope

An electroscope is the instrument used to detect charged bodies. Here is an electronic version of the scope that is sensitive and, unlike conventional...

LASER-BASED INTRUDER ALARM

You can use this laser-based intruder alarm conveniently at the entrance of a hall or any other similar location to protect the same from...

AC MAINS BISTABLE SWITCH

This AC mains-operated bistable switch turns on or turns off a device using a miniature neon lamp and a few discrete components. This switch...

MOTOR CONTROL THROUGH PWM

Motion control plays a vital role in industrial automation. It is required in manufacturing plants of industries like chemical, pharmaceutical, plastic and textile. And...

Call Bell With Welcome Indication

Here is a simple call bell circuit that displays a welcome message when somebody presses the call bell switch momentarily. The alphanumeric display can...

CASH BOX GUARD

Most thefts happen after midnight when people enter the second phase of sleep called 'paradoxical sleep.' Here is a smart security circuit for your...

GUITAR EFFECT PEDAL POWER

A friend of mine plays guitar with several guitar effect pedals. He had a problem with battery eliminators and cables of the pedals cluttering...

FLASHER FOR DEEPAWALI

Here is the circuit for a portable electric lamp-cum-LED flasher. It uses a 25W, 230V AC bulb and nine LEDs. When the bulb glows...

Keep Away NI-CD From Memory Effect

Ni-Cd batteries suffer from an undesirable memory effect due to partial discharge. The remedy is to completely discharge the battery before recharging. A simple resistor...

IR-Controlled Water Supply

This circuit can be used in homes or small restaurants for any type of water supply unit, such as toilet flush or washbasin tap. The...

ELECTRIC GUITAR PREAMPLIFIER

Here is the circuit of a guitar preamplifier that would accept any standard guitar pickup. It is also versatile in that it has two...

Simple Key-Hole Lighting Device

When opening the door of your room in the dark, you may have to spend a few minutes searching for the key-hole. Here is...

Halogen lamp Saver For Bikes

Halogen lamps are prone to burn-out owing to their low cold current. The rapid heating inside the lamp melts the thin filament and cuts...

Twi-light using white LEDs

This sunlight-controlled lamp uses a light-dependent resistor (LDR) as the sunlight sensor and a total of 25 high-brightness white LEDs. Separate resistors are connected...

Timer for Mosquito Destroyer

In electric-heating mosquito repellents, an electric vaporiser heats up a mat or liquid to release non-degrading chemicals into the air and keep the mosquitoes...

Pushbutton Control For Single-Phase Appliances

This circuit lets you switch off and switch on a single-phase appliance using two separate push switches. Such an arrangement is common for industrial...
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