To begin with, this Sound Operated Music Bell Circuit is small project that play music when it hear sound like clap or knock, it use microphone to catch sound and then start music using some small electronic parts.
Also, this circuit is fun, easy to make and good for hobby or decoration use.
What is a Sound Operated Music Bell Circuit:
In addition, this project is small electric circuit that make music bell sound when it hear some outside sound or noise, it uses microphone to catch sound and then make nice music using small sound maker part.
Also, people use this for fun, decoration or small hobby project.
Exploring the Potential of Sound Operated Music Bells:
Firstly, there is many ways to use sound operated music bell:
For example, we can put it near window so it play soft music when wind is blowing or make it play sound when someone knocks the door.
Overall, final design is very nice and we can change things to make it how we like, now it is the time to start fun and exciting making of this sound music bell circuit.
However, first we need to understand how it work inside and what parts it have and what each parts do.
Circuit Working:
Parts List:
| Components | Values | Quantity |
|---|---|---|
| Resistors (All resistors are 1/4 watt unless specified) | ||
| R1 10k | 1 | |
| R2 470k | 1 | |
| R3 2.2k | 1 | |
| R4 150k | 1 | |
| R5 100Ω | 1 | |
| Preset VR1 1M | 1 | |
| Capacitors | ||
| C1 Electrolytic 22µF 16V | 1 | |
| C2 Ceramic 0.1µF | 1 | |
| C3 Ceramic 0.22µF | 1 | |
| C4 Electrolytic 220µF 10V | 1 | |
| C5 Ceramic 0.01µF | 1 | |
| Semiconductors | ||
| Diode 1N4007 | 1 | |
| Transistor BC547 | 1 | |
| Transistor 2N2222 | 1 | |
| IC1 555 | 1 | |
| IC2 UM66 | 1 | |
| Electret Mic | 1 | |
| Speaker 8Ω | 1 | |
| Push button switch | 1 |
Firstly, IC1 555 timer is very important part in this circuit, as it work in Class C mode and it react to sound around it.
After that, when VR1 preset is turn to highest value then IC1 can keep working for around 30 seconds, but we can change this time by adjusting VR1.
Also, we can find the time T using the formula below:
Thus, in this circuit VR1 is the resistance that control the time.
Next, the music part (such as the IC2 UM66) contains 64 notes, playing them sequentially until it detects a clap sound, it activates when we turn the timer ON.
Also, pin 3 of IC 555 connects to 1N4001 diode and then connect to pin 2 of IC2 UM66 and when UM66 get power it send small music signal to base of T2 transistor 2N2222.
Furthermore, this transistor act like a platform to make music sound.
Formulas:
Here, we use a formula to find the time for the Sound Operated Music Bell Circuit.
T = 1.1 × VR1 × C1
where:
- T is time in seconds how long the circuit stay ON after hearing a sound.
- VR1 is a preset like small knob resistor we can change to set time or how sensitive the circuit is.
- C1 is a capacitor it help control how long the action happens.
Note:
Hence, the above formula uses the values of VR1 and C1 to make it easy to find the time T and we can turn VR1 to make the circuit work longer or at shorter time.
How to Build:
To build a Sound Operated Music Bell Circuit follow the below mentioned steps for connection:
- First, collect all parts shown in the circuit diagram.
- Start, with the circuit layout of sound operated music bell.
- Next, step one connect the 555 timer IC and follow the diagram and connect all pins properly.
- Also, be sure to put the variable resistor VR1 and wire it correctly using the formula we saw before.
- Now, add the melody IC UM66 into the circuit.
- After that, connect pin 3 of the 555 IC to a 1N4001 diode then connect that to pin 2 of UM66.
- Next, connect the transistor 2N2222.
- Thus, follow the diagram and connect the base of transistor to UM66 output and also connect collector and emitter properly.
- Now, connect the 4 ohm speaker to transistors collector and emitter and through this speaker will play the sound.
- After that, putting all parts together time to test the music bell!
- Lastly, switch ON the circuit and see how it reacts to nearby sounds.
Advantages of Sound Operated Music Bell Circuit:
Sound-operated music bell circuit have many advantages.
First, it very simple and low cost project, so it can build easy using basic electronic parts.
Also, it work automatic means it can respond to sound like clap or knock without using any manual switch.
More than that, it is fun and creative learning project, specially for students who want to learn about electronics, microphone and IC circuits.
Another good thing is it can use like smart doorbell system, so it make home or office more easy and comfortable.
Finally, it is also customizable, so we can change sound sensitivity or even change music as per our choice.
Conclusion
To conclude, installing a Sound Operated Music Bell Circuit at home or work place is fun and creative way to bring music around us.
Moreover, it hear the sound the circuit uses microphone to start and play music.
Finally, if anyone is having any question or want to know more about this circuit feel free to ask in the comments below and enjoy learning and have fun exploring more about sound operated music bells!