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5V from Portable Wind Turbine

This project deals with the design and development of a portable wind turbine unit, capable of generating electricity from the kinetic energy in the...

Fire Alarm Using Thermistor

In this fire alarm circuit, a thermistor works as the heat sensor. When temperature increases, its resistance decreases, and vice versa. At normal temperature,...

RF Signal Detector

This simple RF signal detector circuit can be used to trace the presence of RF signals and electromagnetic noise in your residential area, office...

Rechargeable Torch Based on White LED

Rechargeable torches don’t come without problems. You need to replace the bulbs and charge the batteries frequently. The average incandescent light-emitting diode (LED) based...

Bench Power Supply Using a Computer’s Power Supply

A good bench power supply is the most vital equipment for electronics engineers and hobbyists. However, bench power supplies used in R&D labs are...

Water Pump Dry Run Guard

Presented here is a water pump dry run guard that works as an effective solution for protection of household submersible water pumps against dry...

3W Audio Amplifier Using TDA7056

Audio amplifier circuits commonly use single-chip audio ICs like LM384 and LM386. These circuits look very easy to assemble but require additional components like...

Protection for Your Electrical Appliances

Here is a very low cost circuit for protecting electrical appliances, such as TV, tape recorder, refrigerator, and other instruments during sudden tripping and...

Toy Car: Infra-red Motor controller

This add-on circuit enables remote switching on/off of a battery operated toy car with the help of a TV/ video remote control handset operating...

Stereo Amplifier Using TDA7052 ICs For Portable Devices

Portable devices like personal computers, MP3 players, sound recorders, telephones and audible sensors are frequently in need of additional stereo amplifier to produce sufficient...

Smart Cellphone Guard

Smart cellphone guard presented here is in fact a simple infrared (IR) sensor alarm secures your cellphone with an invisible beam of light that...

Periodically On-Off Mosquito Repellent

Some of the mosquito repellent available in the market use a toxic liquid to generate poisonous vapours in order to repel mosquitoes out of...

Water-level Controller

In most houses, water is first stored in an underground tank (UGT) and from there it is pumped up to the overhead tank (OHT)...

3W/6W audio amplifier using TDA2003

This is a simple audio-frequency (AF) amplifier using the popular audio amplifier IC TDA2003. The IC comes in a 5-pin TO-220B package. Audio amplifier circuit...

Sunset Lamp

LDR-based automatic lights flicker due to the change in light intensity at dawn and dusk. So compact fluorescent lamps (CFLs) are unsuitable in such...

Smart Emergency Light

An emergency light can come in handy at all sorts of time, especially when there's a power outage. Now you need not fear dark...

Numeric Water Level Indicator

Most water level indicators for water tanks are based on the number of LEDs that glow to indicate the corresponding level of water in...

Door Guard

This door guard uses operational amplifier µA741 and a light-dependent resistor (LDR). Operational amplifier µA741 is used as a sensitive voltage comparator. Preset VR1...

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