Every day addiction of people towards technology is growing deeper and deeper, even before entering into someone’s house we press doorbell which is a clear example to support our belief. Listening same doorbell always might be boring, this circuit 12 tones doorbell help us to avoid this dull situation.
Music doorbells, music horns, touch-sensitive doorbells, etc are not new projects electronics hobbyists, especially for BEP readers. But, this music producer (twelve popular tones in sequences) gives a new dimension to musical doorbells. Whenever a switch is pressed, a popular tone pops out to refresh our minds. Â Using the circuit we have prepared here 12 different tones can be heard in sequence.
Circuit description of 12 tones doorbell
The heart of the circuit 12 tones doorbell incorporates integrated circuit UM34815A (IC1). This integrated circuit falls in the group of door-bell IC chips. The IC1 is a 10-pin DIL (dual inline) package IC. It contains a ROM with 512 musical notes, 6 tone generators, rhythm generators, modulators, oscillators, frequency dividers, and pre-amplifier. In the circuit of 12 tone doorbells, very few components have to be externally connected to set up the timing of the built-in oscillator and to build an external AF amplifier/driver circuit.
The circuit of 12 tone doorbells starts operating as soon as the switch SW1 is pressed and then the tune is played in an ascending order serially i.e. song tune-1, song tune-2, etc.
Transistor T1 (SL100A) is used as an amplifier-driver connected with the pre-amplified output of the chip from pin 11 to drive any 8-ohm or 4-ohm speaker directly. The speed of the tune being played can be changed by varying the value of resistor R1.
Battery B1 is used to supply the input voltage in the circuit of 12 tone doorbells.
By adjusting the value of capacitor; C1 and resistor; R1, more notes can be played as per the need.
Check out various other doorbell project projects in bestengineeringprojects.com
- Door Bell Circuit
- Light and Touch Operated Music Door Bell
- Alarm Circuit | Door Bell Circuit
- Mains Trigger Musical Door Bell Circuit
PARTS LIST OF 12 TONES DOORBELL
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Resistor (all ¼-watt, ± 5% Carbon) |
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R1=  100 KΩ R2  = 15KΩ |
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Capacitors |
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C1= 47 pF (Ceramic Disc) |
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Semiconductors |
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IC1 Â = UM34815A(operational amplifier) T1 Â = SL100A (NPN transistor) D1= IN4001 (Rectifier Diode) |
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Miscellaneous |
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LS1 = 4Ω OR 8Ω speaker SW1 =push-to-on-switch B1 = 3v Battery |