build your own ultrasonic bird repeller

also I need to be able to have its frequency adjustable, your help would be much appreciated, Regard Rick. a PIR will detect all types of living beings including human beings, so that will not work…. Last Updated on January 17, 2020 by Swagatam 82 Comments. I´ve just done a proyect in Kicad and Freecad, where can i upload the files for it?

Also can I use a Compression driver instead of a speaker as it appears that Compression drivers are much more efficient. The speaker vibrates at the specified amplified level throwing the ultrasonic sound in the direction where the dogs need to be driven away. in our country daily one or two people are get dead due to wild elephant. Ashok, the response that you are getting from the speaker looks OK, but it should not happen continuously…rather only when a sound hits the MIC. However this circuit being extremely sensitive could get triggered by other forms of sounds in the vicinity. Compare. additionally you can use a Darlington transistor for Q1 for enhancing the sensitivity of the unit, that's great, now you can confirm the final results with an actual dog barking, you are welcome, actually any opamp will work here, you can easily replace it with an ordinary IC 741. Ultrasonic Pest Repellent - Link : Accurate LC Meter Build your own Accurate LC Meter (Capacitance Inductance Meter) and start making your own coils and inductors. any part number?Thanks. 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