Think like small motorboat comes inside our room very easy and this Motor Boat Sound Generator Circuit is an electric thing enough for this design.
Also there is no need of water, no need of big wooden frame or big motor join.
What is a Motor Boat Sound Generator Circuit:
Motor boat sound generator circuit is electric circuit that make sound like motor boat engine;
Here, the circuit is having many small electric parts that work together to make ‘phut phut’ sound which is same like real motor boat moving.
Also, people use this circuit in toy boats, fun projects and for time pass because it produces sound very close to real engine sound.
Circuit Working:
Parts List:
| Components | Quantity |
|---|---|
| Resistors | |
| 1k 1/4 watt | 2 |
| 10k 1/4 watt | 2 |
| 68k 1/4 watt | 1 |
| Potentiometer 100k | 1 |
| Capacitors | |
| Ceramic 0.22μF | 1 |
| Electrolytic 2.2μF 25V | 2 |
| Semiconductors | |
| Transistors BC547 | 2 |
| ON/OFF Switch | 1 |
| Push Button | 1 |
This small device make motorboat sound when moving; also one knob is there to change the sound like engine start and throttle up-down.
As a result, a good thing is whole system fits inside small box and on top it is having easy buttons to use.
Also, buttons name are: idling, throttle, start and ON/OFF.
After setting speaker volume as we like, connect output wire to amplifier or radio input.
But when we press start button for short time it start making “phut phut” sound like real engine starting.
Do this one or two times to feel like engine warming up, but when we turn ON/OFF switch ON, slow “phut phut” sound start like engine idling.
Then turn the knob slowly to make “phut phut” go faster like giving throttle, also a main working part inside is a free running multivibrator.
Also, that knob which is the potentiometer control speed of “phut phut” by changing multivibrators frequency.
Hence, when the press start, one capacitor charges up with power and this gives short power to device for few seconds which makes “phut phut” sound slowly and fade out like engine starting.
When ON/OFF is ON full power goes inside and device keep making slow “phut phut” sound like engine running.
Then to turn knob more, sound will go faster and like engine going faster and hence, sound will become louder when resistance goes down.
Furthermore, to stop boat engine, sound turn OFF using ON/OFF button in which “phut phut” slowly stops.
Moreover, one capacitor is in output block DC, but allow sound pulses to pass and rest all switch connections we can see in the circuit diagram above.
Formula:
If we want to learn and make adjustable BJT astable circuits we can start with this formula:
f = 1 / (1.4 × ln(1 + R2 / R1) × C1)
here,
- f is the frequency of output signal in Hertz H.
- R1 and R2 are resistors connected to the base of both BJTs and they control the output signal speed.
- C1 is the capacitor which connects between base and collector of both BJTs.
- ln is natural log
Some important things:
This formula works when BJT is working in active mode, capacitor must charge and discharge fully in every cycle.
But in real circuit parts may not be perfect like BJT gain and value tolerance, so output frequency may not be 100% same as calculated.
We can change R1 and R2 to get different frequencies which gives flexibility.
hence, this formula will shows if R2/R1 ratio is higher then frequency will change.
How to Build:
To build a Motor Boat Sound Generator Circuit follow the below mentioned steps for connections and assembling:
Study the Circuit Diagram:
- First, look at the circuit diagram carefully and see where each part goes and how wires connect.
Note the Parts:
- Next, write down value of resistors, capacitors and other parts.
Collect the Parts:
- After that, take all parts we need same like in the circuit diagram.
Prepare the Board:
- We should use PCB put parts in right place as shown in circuit and also should use diagram to guide, when soldering the parts on PCB.
Connect the Parts:
- Now, use small wires to join all parts together but be careful with parts like capacitors and diodes as they have + and − sides which is the polarity.
Soldering:
- After that, solder all pins and wires properly and also be sure there is no short circuit and all joints are solid.
Controls and Potentiometer:
- Then follow the circuit and connect ON/OFF switch, start button and potentiometer, as these will help change the engine sound like start or speed up.
- Next, connect power in the correct place as shown in circuit and check the voltage is right not too high or low.
- Also, turn power ON and use multimeter to check voltage at different points and press start button and turn knob like potentiometer to hear different boat engine sounds.
Tuning:
- After that, adjust the potentiometer slowly to get best engine sound and also try different settings until it sounds like real motorboat.
Important Tips:
- Lastly, check all connections and part values again to avoid mistakes and if anyone is new to electronics then better ask someone or check more information online.
Conclusion:
In this Motor Boat Sound Generator Circuit the ON/OFF switch, start button and potentiometer give user full control of engine sound; also we can make sound stop, idle or start up like real boat.
Also, the final result is a fun and useful for engine sound circuit, which toy boat hobbyists and sound effect projects often use to make sounds more realistic.