Simple Musical Calling bell

This is a simple musical calling bell. You can make it with a little budge, about 50 tk only.
Lets see the circuit

Required parts :
1. 3 pin IC UM66T                                       10-15 tk
2. Pencil Battery Casing                               25 tk
     You can use any other case or broken toy's battery holder which will reduce your cost.
3. 4-5 fit wire                                                  10 tk
4. A small 8(ohm) speaker                            20 tk
        You can use any other speaker taken form Walkman or toys.
 5. 1 bed switch                                              10-15 tk

Working Procedure:
1. Connect the circuit element according to the diagram.
2. If you want to use a long wire then use the switch between speaker and pin no 1.

How to sense temperature!!!

It is really easy to sense the temperature of any environment.
We can use a analog device name LM35.

The V+ and GND pin is connected to a 5 volt source. Like mobile charger.
The equivalent voltage of the current temperature will drooped through the Vout pin.

Welcome to all !!!

This is my first blogging sites where all electronics Hobie st, Students, Engineers are welcome to share there new innovation and discussion.