The circuit operates using a pair of ultrasonic transmitter and receiver modules which are used to detect the person. When the person is detected (the person is in the front door), the doorbell is ...

This simple and cost-effective ding dong electronic doorbell circuit is based on IC 8021-2. The IC has an in-built circuitry to produce ding dong sound each time its pin 3 is pulled low. The sound is ...

AUSTIN, Texas — Christopher Bell is making the most of his late-race chances to seize victories. Bell passed Kyle Busch with five laps to go, then held off Daytona 500 winner William Byron to win ...

Christopher Bell took home his second NASCAR victory in as many weeks, winning the checkered flag at Circuit of the Americas on Sunday. Bell also won the Ambetter Health 400 in Atlanta last week ...

Here’s a new killer-looks limited edition Bell helmet proudly bearing the signature of Airtrix founder Chris Wood: the 2014 Circuit of the Americas Star Carbon lid, available for purchase until April ...

The next thing to check is the doorbell itself. Dust, smoke, and grease can collect on chimes and obstruct the hammer mechanism. Try replacing your present doorbell with an inexpensive bell. If your ...