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 ...

Consumer Reports has no financial relationship with advertisers on this site. It’s easy to understand the appeal of video doorbells: You can see when a package is delivered and be alerted when someone ...

A wired doorbell system has three components: a low-voltage (15- to 20-volt) transformer, a chime and a doorbell button. They are connected by 18- or 20-gauge low-voltage wires. Although it’s at low ...

HUNTSVILLE, AL -- Madison County Circuit Judge Billy Bell has been a reluctant part of thousands of divorces over his 30-year career as an attorney and seven years on the bench. And he's ready for a ...

HUNTSVILLE, Alabama -- Madison County Circuit Judge Billy Bell is retiring today after 12 years on the bench and 30 years practicing law before that. Bell was a very successful divorce attorney and ...

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 ...

FLINT, MI -- Celeste Bell will follow in her father's footsteps and continue to serve Genesee County as the newest circuit court judge. Gov. Rick Snyder announced her appointment on Monday, Feb. 5.