How to turn Smoke alarm into Ultrasonic Dog Repellant

I am pretty new to all that stuff. 

So far I have experimented with 555 at 10-25 kHz, but the dB is too low. Even at 10 kHz the output power is pretty low (measured by my Samsung app, Oscope at  2-4 cm distance  it's just a few dB). I am using a piezo transducer from an old sound system, no spec, just a piezo disk 2.5cm diam with two leads black and red).

My question : Is it possible to turn an old smoke alarm into an Ultrasonic Dog Replant?

Apologizes for the typo  - it's  Dog  REPELLANT, Dog Silencer

Any way of changing the title?

  Joined September 26, 2018      1
Wednesday at 03:18 PM