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DIY Musical Doorbell

STDDIY Musical Doorbell

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License

GPL 3.0

Creation time:2019-05-11 06:56:44Update time:2019-05-11 07:14:45

Description

UM66T Melody Generator

An UM66T generates various Melody Tunes when triggered which can be used in car/scooter reverse signals, doorbells and toys.

Full Video:
Musical Bell

Order PCB: PCBWay

Electronic Components

QtyComponentBuy
1IC UM66TAliExpress
1100Ω 220Ω 4.7KΩ ResistorAliExpress
1BC547 TransistorAliExpress
1SPDT Slide SwitchAliExpress
15mm LEDAliExpress
1100uF CapacitorAliExpress
10.1uF CapacitorAliExpress
1SpeakerAliExpress
15VDC AdapterAliExpress
1PCBAliExpress
ToolsBuy
Soldering IronAliExpress
Soldering WireAliExpress
Mini PCB Hand Drill + BitsAliExpress
Wire CutterAliExpress
Wire StripperAliExpress
Soldering Helping HandsAliExpress

Working

UM66T:

The UM66T is an CMOS LSI designed for musical applications and has an on-chip ROM
containing a musical tune. The deice has very low power consumption (around 180mW)
since it is fabricated using the CMOS process. The IC includes an inbuilt oscillation
circuit. Hence a compact melody module can be constructed with only a few additional
components.

Pinout
Pin Description

Block Diagram

An input trigger enables the tone generator unit which in turn drives an external speaker unit.
The tone generator unit consists of the Oscillator, Rhythm generator, Tempo generator and ROM.
The oscillator frequency is used as a time for tone and beat generators. Its accuracy affects the quality of the
music.

Schematic

A 5VDC power adapter is used as the power supply. 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.
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. An external transistor amplifies the signal and it's output is
connected to a speaker. An LED turns on whenever the circuit is triggered.

Contributing🛠

Are you an engineer or hobbyist who has a great idea for a new feature in this project? Maybe you have a good idea for a bug fix? Feel free to grab our code & schematics from GitHub and tinker with it. Don't forget to smash ⭐️ & the Pull Request button.

Design Drawing

schematic diagram
PCB

BOM

Bom empty

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