Cat repeller circuit

With this cool cat repeller circuit you could chase the cats off from any where you want.In fact, I designed this circuit to chase my cat from my computer table.Most of the animals like cats respond violently to ultrasonic sound and in fact it’s the best way to chase them off.This principle is employed in this circuit.
The circuit here is nothing but an astable multi vibrator wired around NE555 (IC1).The produces an ultrasonic sound in the range 15-20Khz.The NE 555 is enough to drive a small piezo buzzer and no amplification stages are needed.The POT R2 can be used to adjust the frequency of sound.

Notes.

* The circuit can be powered from a 9V battery or the power can be tapped from your computer SMPS.
* The circuit can be assembled on a general purpose PCB.