AUGUST 2011: The PC industry continues to grow in India. By the end of this year, it is forecast that laptop sales will exceed...

Here is a meter to measure the human heart rate. The pulses are picked up around the wrist (just as it is examined by...

This simple circuit can be used as an automatic bathroom lamp controller. It disables the bathroom lamp at daytime and enables it at night....

This circuit can be operated by any kind of switch. For example, it can be used in a shop to warn that a customer...

This circuit can be used as a warning device which triggers an alarm whenever the temperature exceeds a preset level. It can also be...

This timer is a useful device for people who often forget to turn off devices in time. Suppose you want to boil water in...

This 6V battery-operated circuit triggers an acoustic piezobuzzer when a sound is detected. It can also be used as a cheap acoustic-type glass break...

This system can be used in offices or hotels to call an attendant from seven different locations. The circuit provides audio indication of the...

Milliohm meter is used to check low resistance of connecting wires. It can deduce the resistance of thick wires, condition of contacts and the...

With booming solar industry there is a need for measurement instruments to test the various components of solar-powered systems COL (RETD) N.C. PANDE JULY 2011: Solar...