DESIGN AND CONSTRUCTION OF MELODY TONE GENERATOR

Abstract

The scope of this project covers an elaborate approach to the design and implementation of Melody Tone Generator using a piezo sounder otherwise known as the Melody Generator Chip. The design and construction of a Melody Tone Generator is described in this project write-up. The project is intended to produce an output of audible sound melody signal in flashing light display using an LED (Light Emitting Diode) at an appropriate time interval. The output of the project depends solely upon the MeloQY Generator chip . . The UM66 Melody Generator Chip is compact model containing a logic-controlled tone generator. The oscillator runs at 64 kHz and its accurately affects the quality of the music. Its output is used as a time base for the tone and beat gen~rators . Its output then passes to the tempo generator before entering the timing and controlted circuits. This produces two main signals one is fed into the program counter and the other to the output control circuit. A power on reset signal is also generated for the oscillator and program counter. This ensures that the melody begins from the first note each time power is applied to the chip. After connecting the power, the tone will play once or twice and stops. The voltage supply to the chip must be moved then reapplied to re-trigger in. The output control stage acts as a sound gate turning on and off under the command of the timing circuit. The output buffer can supply 1.5 mA of drive current, enough for a piezo sounder to be driven directly by the chip. All this hi-tech circuitry is contained in a three pin plastic package looking more like a transistor than a complex chip.