This device plugs in and produces high pitched noises that mice and rats dislike.
The noises are too loud for humans and animals to hear.
This is a great option if one is unable or unwilling to use poison.
It simply shouts with sound waves causing rats to run away.
What is an Electronic Rat Repellent Circuit:
An electronic rat repellent circuit is a device that generates ultrasonic sound waves to keep rats and mice away from a particular area.
Rats can sense ultrasonic frequencies ranging from 30kHz to 50kHz which are beyond the range of human hearing.
The idea is that the generated high frequency sound waves make the rats uncomfortable or annoying which makes them to leave the protected area.
Circuit Diagram:
Parts List:
| Component | Quantity |
|---|---|
| Resistors (All resistors are 1/4 watt unless specified) | |
| 100k | 3 |
| 4.7k | 2 |
| 1k | 2 |
| 18k | 1 |
| Preset VR1 470k | 1 |
| Presets VR2 to VR6 100k | 5 |
| 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 |
| Transistors T3 and T4 BD140 | 2 |
| Diodes D1 to D5 1N4148 | 5 |
| Piezo Buzzer | 1 |
How to Build:
Following are the steps to build a Precision Electronic Rat Repellent Circuit:
Put the oscillator circuit together:
- A 555 IC is used to construct an oscillator circuit.
- The required high frequency pulses are generated by this circuit.
- Connect capacitors and resistors to set the frequency between 30 and 50 kHz.
The location of the ultrasonic transducer should be:
- One should remember the output of the oscillator circuit should be connected to the input of the ultrasonic transducer.
- Check the ultrasonic transducers capacity to produce frequencies within the range that is required.
Source of Power:
- Connect a battery or power source to the circuit.
- To hear the sound while testing connect a buzzer or speaker to the circuit.
- Though its optional this step can help verify if the circuit is functioning.
- Confirm that the sound that is released falls inside the ultrasonic range.
The enclosure:
- To protect the circuit from outside elements place the circuit parts in a suitable container
Positioning:
- Keep the device on the right spot to keep rodents away.
- Make sure there is enough room for the ultrasonic waves to travel.
Observe and Modify:
- Keep a watch on how well the device keeps rodents away.
- Based on the result one may have to change the power level or frequency.
Take note:
- Keep in mind that the efficiency of these devices might differ and it is important to keep in mind the various factors like the areas size, the kind of rodents present and the particular ultrasonic frequency released.
- Also always take care and follow to all safety standards while handling electronic components.
Formulas:
Depending on the frequency needed a common oscillator configuration could consist of capacitors, resistors and sometimes a ceramic or crystal resonator.
The following is a common oscillator frequency formula based on a simple resistor capacitor (RC) network:
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.
Since humans might not be able to hear certain frequencies which rats find irritating a practical oscillator circuits designed to keep off rats use these frequencies.
These frequencies are often above the ultrasonic range of 20 kHz.
Conclusion:
It is important to remember that the size of the area, the kind of rats present and the particular ultrasonic frequency released this all affect how successful electronic rat repellent devices is.
According to some research rats are likely to become more used to the ultrasonic sound which would lessen the devices long term effect.
As a result regular checks and possible circuit modifications are possibly required.
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