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    There are many ultrasonic pest repellent devices available on the market but a major drawback is that their power output is low and their effectiveness suffers. This electronic pest repellent generates powerful ultrasonic signals to repel pests.

    In addition to the ultrasonic frequency oscillator built with the CD4047 IC, separate push-pull power amplifier (with 2N3055 or TIP31C) and transformer are used to boost ultrasonic signals. The output of the power amplifier is coupled to a tweeter through output transformer X1, which is wound over ferrite core (UU or CC core).

    Primary winding consists of 150 turns of 20 SWG while the secondary winding is 40 turns of 24 SWG wire. Adjust potentiometer VR1 for maximum effectiveness.
    This pest repellent circuit has not been tested!

    Caution! This is a powerful ultrasonic pest repellent circuit so use it only in outdoor places. Do not use this ultrasonic pest repeller near babies or animal pets.

    Electronic Pest Repellent Circuit Diagram

    electronic pest repellent circuit schematic

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    26 Responses to "Electronic Pest Repellent Circuit"

    1. Great circuit thanks!, these are my comments:

      1.- Circuit requires a power supply of 10Watts or better for permanent use(hours).

      2.-If you use an audio transformer power like me =( ,output power will be transformed to heat inside transformer after of 25KHz.

      3.- Transistors T1,T2 works gets very hot after one minute, use heat disippers to avoid destroy transistors. In my case i used BD137 not BD139.
      If VR1 is near of 5K frecuency is about 30KHz.
      I will make the transformer using ferrite, i hope a better output power.

    2. i need to know – with this transformer who use in circuit how many Voltage you have in output coil ? i think use driver Transistor = BD239C , and power transistor BD249C . give me more info for winding step-up transformer .

    3. can i know how to alter the frequency and get various ranges of frequencies using this circuit

    4. ultrasonic pest control says: on January 10, 2010 at 10:55 am

      very thank to this circuit and please tell me how about used milli amp.?

    5. Hey Guys
      What brings me to your forum is a problem I’m half Mohegan Indian here in Ct . We are having problems with 2 stray dogs constantly on our propery and a stray wolf and bad neighbor with dog that are always on our property my daughter is in danger. I do not wish to put up a fence also no effective police nor health dept.. I wish to aquire or have build a powerful outdoor ultrisonic system , Ive built and fabricated mickey mouse internet sonic systems with no effect. IF this is something someone could build for us. I’am willing to pay upfront for parts and labor and after testing success another dozen units. I can also offer a free stay@ Mohegan sun resort and any free concerts for anyone who is knowledgable to build such a unit.. My family thanks you for anyhelp that you might provide..


    6. can u tell me the construction steps and its working principle..

    7. Please could you let me know if this is using an ultrasonic transducer to produce the noise. Is the tweeter just a standard one or have you built it yourself? What is the frequency of the output? Many thanks CL

    8. Nice circuit!.. can you give me the how watts of audio transformers to be used?

    9. what is the rated in watts of audio transformer to be used and also the speaker?.. thanks

    10. Potrbna mije šema rasterivača ptica. Napajanje po mogućnosti 220/12v ida pokriva prostor min.100m kvadratna imali tako nešto dase uradi. Hvala unapred svima ko mi pošalje šemu sa pratećem uputstvu.

    11. good circuit but what about of curent?

    12. Tambari Akpo B.M says: on August 21, 2012 at 10:43 pm

      From Tambari Akpo, Thanks alot for your problem-solving circuit. But may I ask, is there any relationship between the ultrasonic wavelength and the power output of the Transducer? Please reply.

    13. Hello everybody,
      Have you something similar but against a anoying rooster?
      Thank you very much

    14. hi.
      i am a invertor.
      thank you for this circuit.can we replays or chang the transformer?
      thank you very mach.

    15. That is good!

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    16. I’m a dumbass when it comes to electronics. Can someone build one of these noise makers for me .I will send what u need just tell me when and where.have big problem w/dogs hv been to court no good. Please help

    17. Hi
      Thank you very much for this article.
      I request you put into orbit for an animal that is not،That could be Hrtghyyr frequency device, animal away

    18. Primary winding consists of 150 turns of 20 SWG or 28swg? bd139s and tip31Cs get extremely hot, what can be the reason for that? Should i use a regular tweeter or an ultrasonic transceiver?

    19. there is no 5watts tweeter out there, that can give out anything more than 20khz. and there is no ultrasonic transmitter that gives out more than 117db. what did you guys use for a tweeter?what kind of paradox this schematic is?

    20. Ronald Fonseka says: on July 30, 2014 at 7:03 am

      Dear Sir.
      Your circuit seems great and I am sure it can be used to repell
      Monkeys ( a very common pest in Sri Lanka ).
      I would like to use it with a Piezoelectric Speaker which is the
      only cheap speaker which has a frequency response up to 40 KHz.
      Could you please inform me the primary & secondary turns I should use (including wire size ) and the size & type of Ferrite Core for driving this type of high impedance speaker.
      I would very much appreciate if you could reply by E-Mail.
      Best Regards,
      Ronald Fonseka,
      Sri Lanka.

    21. What is ujt in the circuit and round things with arrow and rectangle blocks

    22. Hi, Could you please specify the details of the Speaker and the Transformer core. Thanks

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