• Register
  • Login
  • looking for something?

    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

    Find more projects
    

    22 Responses to "Electronic Pest Repellent Circuit"

    subscribe to newsletter
    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. Hacko1979 says: on August 19, 2009 at 8:43 pm

      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. 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..

      thanks
      johnny
      off2timbuktu@yahoo.com

    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. ebrahim says: on July 1, 2012 at 5:00 pm

      good circuit but what about of curent?

    12. 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. mohammad(m-b) says: on October 17, 2012 at 12:50 am

      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!

      My webste: gofreelife.com

      Being focused on improving your living environmental quality, we manufacture and develop ultrasonic and anion products, such as ultrasonic pest repeller, ultrasonic animal repeller, anion air Purifier and household Ultrasonic Cleaner etc.

      The professional research and design will let the products tell. With over 10 years relevant experiences, our engineers and designers are able to offer you ODM or OEM services. From the concept of the design, we will completely follow your requirements. In order to supply you with qualified and desirable products, we will optimize products structure, use high-quality accessories and strictly control every processing step. So we promise all the products are certified by CE, RoHS etc.

      If any in need, our passionate sales team will help you, so do not hesitate.

      Let us create saFe Free liFe together!

    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. very good says: on March 22, 2014 at 6:00 pm

      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?

    What do you think about this article? Leave a comment!