Car Reverse Horn
This car reverse horn can be used with any vehicle having a 12V battery. Transistors T2 and T3 form an astable multivibrator (AMV) that...
Battery Deep Discharge Saver
This circuit can be used to ensure that a 12V sealed lead-acid battery does not go into the condition of deep discharge. The circuit...
“We think that LED market in India has potential, especially in...
Jeremy Ng, managing director-R&D, Panasonic Semiconductor Development Asia, tells EFY bureau, the potential of LED drivers market in India
AUGUST 2011: Q. How do you...
5 Things to Ask While Choosing a Measurement Bus
AUGUST 2011: The PC industry continues to grow in India. By the end of this year, it is forecast that laptop sales will exceed...
Pulse Rate Meter
Here is a meter to measure the human heart rate. The pulses are picked up around the wrist (just as it is examined by...
Automatic Bathroom Lamp
This simple circuit can be used as an automatic bathroom lamp controller. It disables the bathroom lamp at daytime and enables it at night....
Door Alert
This circuit can be operated by any kind of switch. For example, it can be used in a shop to warn that a customer...
Over-Temperature Alarm
This circuit can be used as a warning device which triggers an alarm whenever the temperature exceeds a preset level. It can also be...
Simple Alert Timer
This timer is a useful device for people who often forget to turn off devices in time. Suppose you want to boil water in...
Sound Sensor Alarm
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...
