In this Instructable We are going to see the making of simple Door Bell for our rooms,this project is simplest one even made by beginners very well and very cheap .this project costs $1-$2.
Most of them want privacy on their room, this Door Bell may use to avoid the interruption of others. Simply make this project and fix it on your room, this may help to ask the permission to entering by others.
This Door Bell may also used by main Door Bell of the house.
This Door Bell circuit contains two normal NPN transistors (BC 547) and a musical transistor BT 66 T19L.This circuit consumes 3-4.5V.The amount of volume of the Door Bell is increased by increasing the Voltage level.
Step 1: Gathering Tools & Materials
NAME RANGE NO
Resistor - 100R - 1
Capacitor - 220uf/25v - 1
Transistor - BC 547 - 2
Speaker - 4 ohm - 1
Wire ----- required
Battery - AA size - 2
Common PCB ------- required
Push Button Switch - 1
Small Tic Tac box
-Hot Glue Gun
Step 2: ASSEMBLING THE CIRCUIT
Mark the required size on PCB board and cut it out.
Assemble the circuit by give plan.
Solder the wire on the terminals of speaker and connect the speaker to the circuit board.
Step 3: MAKE THE COVER FOR DOORBELL
Because of choosing the Soap Box for this project, normally it contains holes on bottom this will help to spread the speaker sound.
Take the Soap Box; this contains two parts top and bottom parts.
We are going to fix the speaker on Soap Box bottom side ( hole side) by using the Glue Gun.
Mount the plastic bushes on bottom of the circuit board by the help of Super Glue.
Take the top part of the Soap Box; place the circuit board on it by the help of Super Glue.