Simple Music Bell Circuit Diagram

Here is a circuit which can be assembled easily with very few components. This DIY music bell can be used as door bell, cycle bell , car reverse horn and it only requires 3V battery. The core of this circuit is a 3 terminal IC chip which can produce music when properly biased. This IC may looks like a transistor but cant drive a loudspeaker by itself.

Calling Bell Circuit

Apart from the normal musical calling bell circuits, this special electronic calling bell has been created to identify the sound even if there is noisy atmosphere. This bell circuit is not a typical Ding-Dong bell but has the capability of producing different sound that is very useful in noisy surroundings. By pressing a far away switch can trigger this circuit to work as a bell.

Send Data Through Your Body

It's interesting to hear that we can use our body to send Emails if your internet connection is unavailable, right? I read this in a magazine first that  this has already been tested in Korea University, Seoul. They transmitted data through human arm at a speed of 10 Mbps while testing. This has been done by placing two electrodes 1 feet apart on his skin.While searching more about this, i understood that the electrodes that used to research is a thin silicon material that has a capability of bending 90 degree angle 700,000 times. yes, they can send electromagnetic waves by means of wireless transmission through our body.

Simple Telephone Timer Circuit

Telephones are reaching its death point all over the world. however there is more than 350 million mobile phone users in india, but there are tremendous number of telephone users are there also. Well, this telephone timer is designed to help saving by controlling unnecessary time taken during pone calls. This simple timer circuit is better in its accuracy because it is manually put on by the user when the call connects at the other end.