I have a neighbor who's dog barks at all hours of the day. I'm looking to build a device that'll produce ultrasonic audio signals so as to deter the dog from his continuous yapping. Most of what I've seen these devices appear to be driven by a 555 timer circuit. I also noticed that they are powered by VDC. In a perfect world I'd like to be able to power the device with VAC. This is so I can activate the device from inside the house, either through a SPDT (on/off switch) or perhaps a manual trigger. Is it possible to use an ac-to-dc converter in this operation to step down the voltage from 120 VAC to ??? VDC? What else do I know? I know I need a transducer that can transmit (vibrate) at the desired frequency, which I'm assuming a range of somewhere between ~20 kHz and ~40 kHz will suffice. I know I'll need a speaker--or transducer--capable of transmitting such high frequencies. Will I need a signal generator? My intention is to mount the transducer inside a cannon-shaped device like a section of PVC pipe.

So, if my newbie brain is correct the block diagram would flow as such:

power source---->signal generator--->amplifier (driver?)--->speaker

Key Questions:
1). How do I determine my power requirements? And if I can, is it possible to use an ac-to-dc converter so I can activate the device from inside the home?
2). What type of signal generator do I need to construct? I suspect one that will produce the desired frequency, correct? Also, once voltage applied will the tone be constant or is there a way to construct the generator so it pulses at certain intervals? Or perhaps, to have both of these options would be valuable.
3). What type of amplifier do I need to build? I know very little about the fundamentals of how an amp works, but I suspect it needs to modulate the input signal, right?

Other fundamental concerns:
1). How do I determine my electrical values on my passive components?
2). Since I plan on mounting this device on the underside of the patio covering any suggestions for housing the electronics would be great. I think it might be a good idea to incorporate some sort of weather proofing material to avoid any shortages.

Thank you to everyone on this forum who might be able to assist me with this design.

 

Why not buy one like this which includes a remote and also responds to the sound of the bark.
I have one and it works fairly well. Usually the dog only barks a few times before stopping after hearing the signal.
You likely couldn't build one for much less cost.

 

queen trap opening his box again.
i guess youd have to make sure you supported the hz out of the oscillator through the amplifier.
I always thought dc tape bias (what you put on an 80's tape player to adgitate the magnetic tape when its 0 volts) would do the same trick, but i guess because its dc its not an audible waveform. (dumbass me)

 

All dog owners are deaf.
If the ultrasonics project fails, just make a recording of the barking.

Put your stereo loudspeakers by a window facing the neighbor and play the barking on endless loop at full blast. Then go away for the weekend.

 

All dog owners are deaf.
If the ultrasonics project fails, just make a recording of the barking.

Put your stereo loudspeakers by a window facing the neighbor and play the barking on endless loop at full blast. Then go away for the weekend.

So then you can annoy your other neighbors as well as the dog owner.