I am a veteran of suffering from low-frequency foot fall (lived in a basement for many years) and am well versed in these subtleties. Just please help me with the technical aspect of it.Īlso, please no lectures on how low and high frequency sound travels. Let me be an idiot for wasting my money on something that's not going to work. I'm also only doing this through drywall and a brick wall that seperates our townhouse. Imagine I am doing this for other reasons and not for a dog.
I also purchased an inexpensive DIY frequency counter kit so I can dial it in. I picked one that exhibited very clean sinusoidal waves at high frequencies in Youtube reviews. I will be generating the 20-25Khz tone with an Aliexpress generator.
Can someone give me an approximation of the cap value please so that I can avoid the complicated math? I'll probably also solder two capacitors together to make a BP cap to protect the tweeter. I understand I need to wind this myself since it's unusual. What's the low side voltage here and the high side voltage.
#Cts piezo tweeter series#
So far I understand that I need to hook up a transformer in series to the tweeter. I won't be leaving this on all day, just short bursts when the owner is present there as well, so the owner can take note of what's going on by observing either the dog desperate to get out of the room, or what have you.ģ) Transformer, BP capacitor. All I need to do is find the right spot, as in, closest to the dog. The dog is in the room on the other side of the wall. My plan is to move my tweeter around the wall to see where it is best to locate it. I need something simple, preferably something inexpensive with only a volume control and preferably capable of bridging to mono (so I can save money by buying a 100w unit, where it's 2x50w bridged into one output)Ģ) Tweeter. So far I understand I would require the following items:ġ) Amplifier (in my case I would like to attempt it with 50 to 100 watts).
There is an anecdote from someone on Youtube who claims dogs "hid behind objects" when he tried this. Let people experiment for themselves and decide whether it works or not. If you can elaborate on which equipment you discovered in the end worked, it would be helpful. I'll try to give more detail on points 1, 2, 3, and 6 at a later date Note that an air-driven device such as an air-horn does stop them, but not always, and you won't find an air-driven device which is inaudible to humans - if you did succeed in creating an air-driven device at 20 kHz which emitted extremely high SPL (we're talking say 150 dB at 1 metre) it'll likely damage the hearing of the dogs and any humans If you live in a country where the authorities take noise seriously, get the relevant authorities involved instead.ĩ. Conclusion - using HF tones will not deter a barking dogĨ. HF does not travel well through the air, the higher the frequency, the more the molecules absorb the energy instead of simply pushing it onto the next moleculeħ. Getting a high SPL out of an array of tweeters is difficult as tweeters at 20 kHz become exceptionally directional, and an array of them would be a nightmare to set up to keep the beam in phaseĦ. When a dog barks, its bark will suppress any impact of the HF (try directing say 15kHz at yourself and shout loudly, you'll not hear the HF while you're shouting)ĥ. I found a research paper that someone did on dogs' hearing - according to dog breed their hearing is not much better than young humans, indeed some dog breeds are worseĤ. The data sheets for Piezo tweeters need to be carefully interpreted as to the max SPL you'll getģ. Piezo tweeters present a purely capacitive loadĢ.
#Cts piezo tweeter update#
Monacor MPT-177) with nothing else connected, why would the amp produce its max volts ?Īssuming that the amp could at some point produce its max voltage across the piezo (with nothing else connected), and since piezos are mostly a voltage driven device, then is the "gain" above the 2.83V SPL just proportionate to the voltage ?Įither way, this is another reason why it's better to use a transformer, because I know that the amp will see a conventional load - and note that initially I will be putting an oscilloscope across both the primary and secondary to see what's happening.Īdding an update has been on my to-do list since November 2018 !!ġ. So if I were to connect a piezo that is >1k Ohm impedance directly to the amplifier (e.g. I've always though of a Class A, B, or AB solid-state amp as more of a current device, in that if there's nothing there to take the current, then no volts are produced. The 3rd/4th/5th columns use Power = V² / R, where R is in the 2nd column, and V is the max voltage (RMS unclipped) that the amp in each column can give out. I've been thinking about that table that I did in Excel.
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