I drilled four mounting holes in each corner with a diameter of 3mm. I fabricated the board using the Iron Method. When the SPDT slide switch is turned ON, the UM66T is triggered and produces a melody signal that begins from the first note due to the power on reset feature.Īn external transistor amplifies the signal and its output is connected to a speaker.Īn LED turns on whenever the circuit is triggered Since the UM66T has a maximum supply voltage of 4.5V, a 100Ω resistor is used to reduce the supply voltage to a suitable 3.3V. Its accuracy affects the quality of the music.Ī 5VDC power adapter is used as the power supply. The oscillator frequency is used as a time for tone and beat generators. The tone generator unit consists of the Oscillator, Rhythm generator, Tempo generator and ROM. Hence a compact melody module can be constructed with only a few additional components.Īn input trigger enables the tone generator unit which in turn drives an external speaker unit. The IC includes an inbuilt oscillation circuit. The device has very low power consumption (around 180mW) since it is fabricated using the CMOS process. The UM66T otherwise known as the BT66T a CMOS LSI designed for musical applications and has an on-chip ROM containing a musical tune. There are different versions of this IC, each configured to play a different tune.ĭon't forget to Subscribe for more projects: YouTube The Melody Generator will play Beethoven's Für Elise when triggered since it uses the UM66T-19L. Learn how to make a simple musical bell using the UM66T melody generator IC.
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