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Faraday’s Guitar

EFY Bureau
Experimenting with the fundamentals of electrical and electronics is always interesting. Presented here is an electronic circuit that demonstrates Faraday’s law of electromagnetic induction...

Microcontroller-Based Tachometer

K.Padmanabhan
A tachometer is nothing but a simple electronic digital transducer. Normally, it is used for measuring the speed of a rotating shaft. The number...

Auto Reset Proximity Detector

Kaushik Hazarika
Electrochemical processes taking place in our body generate complex signals (hum) that are continuously being passed along the nerve fibres throughout the body. Any...

Experimental Study of Switched Capacitor Circuit

EFY Bureau
In recent years switched capacitor circuit has gained popularity due to their suitability in integrated circuits. The two major problems faced by IC designers are: 1....

PIN Diode Based Fire Sensor

EFY Bureau
Here is a PIN diode based fire sensor that activates an alarm when it detects fire. Thermistor based fire alarms have a drawback; the...

Ding-Dong Bell

EFY Bureau
A doorbell is a signalling device typically placed near a door to a building's entrance. When a visitor presses a button the bell rings...

Multiband Transmitter

EFY Bureau
A radio frequency oscillator is at the heart of all radio transmitters and receivers. It generates high frequency oscillations, which are known as carrier...

Soldering Iron Temperature Controller

EFY Bureau
When soldering, sometimes the need arises to control the temperature of the soldering iron. It is not possible to change the solder iron every...

Harvesting Radio Frequency Energy

EFY Bureau
Most people do not realise that there is an abundance of energy all around us, at all times. We are being bombarded with energy...

Noise Meter

EFY Bureau
Normally, sound intensity up to 30 dB is pleasant. Above 80 dB, it becomes annoying. And if it goes beyond 100 dB, it may...
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