This would be to affect dogs & it would be directed through the neighbors window. The goal is to make them bark not stop it. I was reading the ultrasound transmitter should be at 25-30 KHz. The point of all this would be to make the dogs bark while they are indoors so hopefully, the neighbors will train them. They leave the dogs outside all day & force the neighbors to listen to the dogs bark so they need to be forced to listen to the barking inside their home at night. Maybe then they will train the damn dogs.
Comments
It's doable but will need some experimentation to get it right.
I will take the time to experiment. What materials do I use for this & how do I put it all together? I got this idea off another forum & I registered to ask the poster what materials need to be bought & how to put it all together but I got an unsatisfactory answer. All they said was they put the device together using random household items they had. So helpful. :rolleyes:
It uses a 9 volt battery for a power supply. To alter the frequency range you can change the 10 nF capacitor to a different value. For example if you were to increase the freq you would decrease the value of the capacitor to say 8 nF or to decrease freq, increase the capacitor value to 12 nF.
The circuit is small enough to put in front of a reflector, which can be aimed at your intended target. If you have any trouble just ask and I will try and help.
I'm going to be honest here & say I don't understand any of that. XD
Two things happened.
If I were to do it over, I'd go with a simpler approach.
http://physics.stackexchange.com/questions/1263/how-can-you-focus-sound
This is a good site for the calculations: http://www.kpsec.freeuk.com/555timer.htm#astable
A tweeter from a speaker system might be better for your application because you are in the 25khz to 30khz range instead of 40khz. As for range, more power. I would have to agree that high frequencies don't travel through walls well. Trying to bounce the signal off of a satellite dish is probably not going to do any good either.
Sound pressure goes down by 6db every time you double the distance. At 3 feet you might have 100db, at 6ft, 84db, 12ft 78db, 24ft 72db, 48ft 66db, 96ft 60db. And that is without obstructions. You lose about 40db in 96 feet so to have 100db you would need to start out around 140db.
From http://willapse.hubpages.com/hub/Speaker-Watt
Overall I would recommend placing it closer to their house if at all possible.
Actually I'm not trying to piss off my neighbor's dogs. I'm working in a team to build a position system for a bunch of robots. Our idea was to use four ultrasonic beacons which emits sound waves from four corners of a basketball court. The coverage is the entire court. The beacons have distinct frequencies. The robots on the field have receivers so that they can measure the distance between them and the beacons. Using multiple distances they can figure out their positions relative to a fixed reference point.
I guess we could modify the circuit in http://ecelab.com/circuit-ultrasonic-t.htm to achieve different frequencies. We only need to have more power to achieve the range, correct?
You would have to figure out how to measure the amplitude of the signal. Could be fairly difficult...I've never researched this as a possibility. If you have 2 receivers you can compute the direction because one will receive the signal before the other. Not sure how distance would work.
In theory yes.
http://www.bestofferbuy.com/60ft-Ultrasonic-Tape-Measure-With-Laser-Pointer-p-7797.html?currency=GBP&utm_source=gbase&utm_medium=cse&utm_campaign=gbase_uk
Or if you want to build one try this :
http://www.micromint.com/app_notes/ti01_data.htm
The difficulty in my project is that there are multiple moving objects I need to detect on a field. I believe the ultrasonic tape and range finder can only measure distance between itself an object in front of it. I will only build one sonar to broadcast ultrasound to the receivers, but haven't figured out a way to do that yet.
Do you know if there is a way to send ultrasound in 360 degrees around it? Due to beam patterns of transducers, I guess I can't achieve that by using one transducer.
That might be an easy way to produce ultrasound. Which speaker did you use? Was it able to broadcast ultrasound in a wide range?
I built the transmitter and receiver based on the circuit diagrams on ECELab.com. When the two were close to each other, they work properly. When I separated them two meters apart, the receiver could hardly pick up any signal. I checked the receiver's circuit, the connections were fine. But for some reason the second amplifier did not increase the amplitude of the signal. Instead, the amplitude decreased. I checked the output from Pin 6 of the second amplifier. The decoder was not used in the tests because I haven't found an NE567 yet. Do you have any idea why the second amplifier wasn't working? I replaced the 741 with a new one, but the problem persisted. Thanks!