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RE: Annoying Ultrasonics

I once built an adjustable frequency utrasonic pest repeller using a piezo horn tweeter driven by a NE555 oscillator. I'm not sure if it worked on pests but I was surprised to learn that even if I could not hear ultrasonic sound, I felt it's presence. It created an annoying pressure around my head when the device was turned ON. ;-)

I used a speaker similar to this one and an NE555:


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