A lot of toys have some kind of melody tones in them. But how do these tones generate? Here we have designed a simple tone generator circuit using only a single melody generator IC.
- 1K Resistor
- 3 Volt lithium Battery
- Push Button
Circuit Diagram and Explanation
Working and connections for this project is very easy. BT66T Melody generator IC’s BD or output pin is connected to buzzer through a 1K resistor and Vss to ground. A push button is connected with Vdd pin of melody IC with battery. When we press this attached button, melody IC plays a “For Elise” melody using a buzzer. If we keep pressing the button, melody repeat again and again.
In this circuit we have used only single chip namely BT66T-19L for generation of Elise melody or sound. A push button is used to start melody and a buzzer for sound and a single 3 Volt Lithium battery for powering the circuit.
Main component of this circuit is melody generator chip which generate a melody tone when we press push button. There are some features mentioned for melody generator family’s IC with some specifications.
BT66T has some melody ICs namely:
BT66T-19L for “For Elise” melody Generation
BT66T-02L for “Jingle bell” melody Generation
BT66T-08L for “Happy Birthday” melody Generation
BT66T-19L for “Love story” melody Generation
BT66T-19L for “It’s a Small World” melody Generation
Plays a melody consisting of 64 note
Inbuilt RC oscillator
64-note ROM memory
Start from the head of melody
Power on Reset
Direct piezo drive
Dynamic speaker cab be driven using transistor externally.
Sound range 2 octaves
Operating Voltage 1.3 Volt to 3.3 Volts