Here is a collection of various alarm circuits which are very useful for engineering students and as well as in our real life also. Nowadays many engineering students are searching for various alarm ...

In this step-by-step tutorial, you'll learn how to make a very loud, simple, and powerful alarm using everyday materials. Perfect for enhancing security at home, this video guides you through the ...

It beeps if the fridge door is left open for too long or hasn’t closed properly, to stop food from spoiling. There are lots of other uses as well. A refrigerator or freezer door that is left open or ...