Imagine you are above the clouds, getting all excited about your first solo trip, and additionally you have an entire row of seats on the plane, and luckily it's the emergency exit bay. And while you ...

This is a simple and very useful article on building a circuit that produces “ding dong” sound using 555 timer. We observe different types of door bells in different houses. They produce different ...

In almost every airplane flight you'll take, a dinging sound will be heard at points throughout the trip. Given that there are millions of flights a year -- 35.3 million scheduled flights worldwide in ...