T.K. Hareendran (4)

1-12-2003 | This circuit can be built from readily available low-cost components, some of which may even be hiding in your junkbox! The indicated value...

1-07-2003 | The circuit described here counts the number of times that an infrared beam is interrupted. It could be used to count the number of people e...

1-12-2002 | This proximity switch employs a reed switch as the sensor device and the good old CD4017 decade counter for pulse processing. When the circu...

1-07-2002 | This simple circuit will tell you, by sounding a buzzer and flashing a LED, that a telephone line is in use. If the telephone line is free,...