Melody Generator, Output Type : AC Single Phase, AC Three Phase

Melody Generator plays melodies with double sound sources. This Melody Generator uses the built-in digital envelope circuit. The BT8031 series are CMOS LSI chip is designed for use in doorbell, telephone and toy applications. They are on chip ROM programmed for musical performance produced by CMOS technology. These devices result in very low power consumption, since the BT8031 includes oscillating and mode selection circuit, a compact melody module can be constructed with only a few additional components.
About the circuit :
The circuit uses BT8031 having 127 words ROM memory, which is capable to store three different tunes. The supply is given to IC through a switch S1. When the switch S1 is pressed it will on the IC. The output of IC is in terms of sound. But, this signal is not enough to drive the speaker, so transistor T1 is used for amplifying the signal and to drive the speaker. The power consumption of circuit is very low. It will work on supply of 3 volt.