This gadget plugs in and makes high pitched sounds that mice and rats do not like.
The sounds are too high for people and pets to hear.
This is a good option if you can not or do not want to use poison.
It basically shouts with sound waves that rodents hate making them leave.
What is an Electronic Rat Repellent Circuit:
An electronic rat repellent circuit is a device designed to emit ultrasonic sound waves with the intention of deterring rats or rodents from a specific area.
Rats can perceive ultrasonic frequencies typically between 30kHz and 50kHz, which are outside the range of human hearing.
The idea is that the emitted high frequency sound waves create an uncomfortable or irritating environment for the rodents encouraging them to leave the protected area.
Circuit Working:
Parts List:
| Component | Value | Quantity | Notes |
|---|---|---|---|
| Resistors (1/4 watt) | All resistors are 1/4 watt unless specified | ||
| 100k | 3 | ||
| 4.7k | 2 | ||
| 1k | 2 | ||
| 18k | 1 | ||
| Potentiometers | |||
| VR1 | 470k | 1 | Preset |
| VR2 to VR6 | 100k | 5 | Presets |
| Capacitors | |||
| Ceramic | 330pF | 2 | |
| Ceramic | 0.01μF | 2 | |
| Electrolytic | |||
| 1μF 25V | 1 | ||
| Semiconductors | |||
| IC | 3130 | 1 | |
| IC | 4017 | 1 | |
| IC | 555 | 1 | |
| IC | 4013 | 1 | |
| Transistors | |||
| T1 and T2 | BD139 | 2 | |
| T3 and T4 | BD140 | 2 | |
| Diodes | |||
| D1 to D5 | 1N4148 | 5 | |
| Other | |||
| Piezo Buzzer | 1 |
How to Build:
Building an electronic rodent repellent using ultrasonic sound waves involves a few steps.
Assemble the Oscillator Circuit:
- Use a 555 IC to create an oscillator circuit.
- This circuit will generate the required high frequency pulses.
- Connect resistors and capacitors to set the frequency within the 30kHz to 50kHz range.
Connect the Ultrasonic Transducer:
- Connect the output of the oscillator circuit to the input of the ultrasonic transducer.
- Ensure that the ultrasonic transducer is rated to emit frequencies within the desired range.
- Connect a speaker or buzzer to the circuit during testing to hear the sound.
- This step is optional but can help confirm that the circuit is functioning.
- Ensure that the emitted sound is within the ultrasonic range.
Enclosure:
- Place the components in a suitable enclosure to protect the circuit from environmental factors.
Placement:
- Install the device in the area where you want to repel rodents.
- Ensure that the ultrasonic waves can propagate through the space effectively.
Monitor and Adjust:
- Monitor the effectiveness of the device in repelling rodents.
- You may need to adjust the frequency or power level based on the results.
Note:
- Remember, the success of such devices can vary and it is essential to consider factors like the size of the area, the type of rodents, and the specific ultrasonic frequency emitted.
- Additionally, always be cautious when working with electronic components and follow safety guidelines.
Formulas:
Depending on the required frequency, a typical oscillator arrangement may include resistors, capacitors and, on occasion a crystal or ceramic resonator.
A general oscillator frequency formula based on a basic resistor capacitor RC network is as follows:
f = 1 / 2πRC
Where:
- f: is the frequency of oscillation,
- R: is the resistance in ohms,
- C: is the capacitance in farads (or microfarads, depending on the units).
Rats find certain frequencies annoying, but humans may not be able to hear them, therefore certain frequencies are used for practical oscillator circuits intended to repel rats.
These frequencies are frequently exceeding 20 kHz, or the ultrasonic range.
Conclusion:
It is important to note that the effectiveness of electronic rat repellent devices can vary based on factors such as the size of the area, the type of rodents and the specific ultrasonic frequency emitted.
Some studies suggest that rodents may eventually become accustomed to the ultrasonic sound reducing the long term effectiveness of such devices.
Therefore, regular monitoring and potential adjustments to the circuit may be necessary.
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