This circuit describe here will generate different sounds when your guest presses the door bell . This circuit is based on a melody generator IC M3482 which can generate 12 different kinds of songs. M3482 is a mask ROM and has inbuilt multi instrument melody generator. This IC is implemented using CMOS technology and designed to play songs according to the previously programmed information. M3482 IC can be operated with just 1.5V power supply and also have very low stand by current which lead to longer battery life. And it also have on chip envelop modulator and pre amplifier.This IC can also be used in different application like in toys, music box, timer and telephones circuits for producing different tones. Continue reading to know how the circuit is assembled and how it is made to work.

Different kinds of door bell are available in market which produces different sounds but the important feature of our circuit is it not only produce musical sound but also indicate the number of times door bell is pressed. In our circuit it will display the counting from 0 to 9. You can also increase the number of person it can count with little modification in circuit. You do not require to press the reset button when counting reaches to 9 as it  automatically starts its counting again from 0 when 9 is reached. You can also vary the time for which door bell sound.This circuit is based on 4026 IC which is a Johnson counter IC commonly used in digital display. It can be used in various applications like in 7 segments decimal display circuit, in clocks, timer etc.For producing melodious sound IC UM66 is used. Do not provide voltage more than 3.5 V to UM66 IC because excess voltage may destroy this IC. 

The ding dong sound of the doorbells signifies the presence of someone at the door. Although there are many doorbells available in the markets today with a variety of sounds, the ding dong doorbell still has its share of the market. What makes them interesting is how do they produce this ding dong sound?The ding dong doorbells use the magnetic force produced by an AC solenoid to force an iron rod (called the plunger) to hit against aluminum sheets placed at both sides of the solenoid. This in turn produces the ding dong sound. The DC and AC solenoids are different. The doorbell uses an AC solenoid. When current flows thorough the coil of an AC solenoid, a magnetic field is produced. This magnetic field produces a magnetic force and pulls the plunger in its direction.