Steve
Rather than using a parabolic reflector, why not use a pair (or triple) of tweeters fed as a phased array to get a directional beam?
Steve
Species | Approximate Range (Hz) |
human | 64-23,000 |
dog | 67-45,000 |
cat | 45-64,000 |
cow | 23-35,000 |
horse | 55-33,500 |
sheep | 100-30,000 |
rabbit | 360-42,000 |
rat | 200-76,000 |
mouse | 1,000-91,000 |
gerbil | 100-60,000 |
guinea pig | 54-50,000 |
hedgehog | 250-45,000 |
raccoon | 100-40,000 |
ferret | 16-44,000 |
opossum | 500-64,000 |
chinchilla | 90-22,800 |
bat | 2,000-110,000 |
beluga whale | 1,000-123,000 |
elephant | 16-12,000 |
porpoise | 75-150,000 |
goldfish | 20-3,000 |
catfish | 50-4,000 |
tuna | 50-1,100 |
bullfrog | 100-3,000 |
tree frog | 50-4,000 |
canary | 250-8,000 |
parakeet | 200-8,500 |
cockatiel | 250-8,000 |
owl | 200-12,000 |
chicken | 125-2,000 |
Hello everyone
I have to add my opinion on this one
The device , I think absolutely has to be unnoticed by humans,
in my case I'm thinking about the many many times the neihbor's dog is actively barking through the night, by blasting that sound I would'nt want to wake the others on the street who are NOT awaken by that vocal dog....
What would also be mandatory for me is that the device could be adjusted so that it would "alter bird's flight pattern " as the pdk did 40 years ago ,
and , also adjustable for thoses times where the neihborgs left their 16 years old boy at home for a weekend and the brilliant "de-b oned" young man decided to play with fireworks at eleven and a half with his friends on a Friday night, + the police would not care to come and have a look for such an insignificant disturbance ....
For thoses times to be human disturbing it would be very nice.
I would alsto like it to be portable, with one hand if possible, and highly directionnal, ...
But that's my needs...
On an off hand note if the volume were kept down .... and modulated correctly that would make a heck of a halloween prank. You could beam voices and sounds at your visitors that nobody else could hear!
What is the best ultrasonic device available for a neighbor’s barking dogs – big time nuisance ?
Thanks for any suggestions--Rick
This is intended to be this group's primary general discussion area.
A high-end portable device is necessarily a sophisticated system incorporating a high-voltage/high-current rechargeable battery system, a microprocessor control and management system with audio input and output, user-interface input and output, and battery management subsystems, a high-power audio amplifier, and an enclosure designed to focus and aim the system's generated sound.
Since each of these are subsystems in their own right, we have broken these out into their own discussions.
But this topic is for general discussion.
My name is Robert, I'm from Romania and I would like to build this Portable Sound Blaster/Hush Puppy. I will be honest from the beginning and admit that I'm a noob in the world of electronics. This means that a schematic on itself is not enough for me to understand how an electronic device works and it's certainly not enough to build. So I need your help. Luckily I'm a quick learner and I would like to realize this build to give myself a push or in other words to reach the next level.
There are quite a few threads here and I just started to follow your project so if you allow me a few questions to make things clear and catch up that would be great. First off, I'd like to know if the intention is to build more versions of the device?
The reason I'm asking this is that HERE I saw an already built, complicated Portable Sound Blaster with four speakers, ARM processor, parabolic reflectors, a large battery, etc. It looks very professional, but as I said it's complicated for a beginner to replicate the build. On the other hand in one of the threads here I saw a schematic about a very simple looking device using simple parts and only a 9 V battery as power source. So what's the situation?
Secondly, I'd like to know if one can already start experimenting even today? If I look at the "simple" version of the device, I think that I could start gathering the components and start experimenting on a breadboard.
Do you think it is reasonable to do this and make adjustments along the way as new ideas emerge?
Or is there a point you already have in mind to have the final schematic ready and it's worth waiting for that?
My third question is related to my situation. I live in an apartment house that has four floors and 20 apartments. I own a three bedroom flat on the second floor and there are many dog owners in this apartment house. On the ground floor there one particularly mean and loud dog that barks a lot when the owners are not at home and I'd like to do something about it. Would this device be "strong" enough to blast the sound through two or three concrete walls and make the dog stop barking? Or do I need to point it directly onto the dog and not have any walls or obstacles in between to have a result?
Thank you in advance for your help! Cheers, Robert
Steve, I built a couple of the v2.0.4 designs into hand-held units, and got one of them in front of a SPL meter yesterday. I have a couple other versions (v1 designs) on breadboard and I'll meter them later.
If the attached picture is missing, 124+ dB measured a few inches away from the tweeter. I saw as high as 126, but it settled down around 124.
Braden,
The photo made it. Very cool.
Do you have any means for measuring the voltage across the tweeter?
What brand of tweeter?
What frequency?... do you know?
Do you know whether the sound level meter has good response all the way up there?
Do you know whether it is 'A' or 'C' weighted?
Thanks!/Steve.
Braden,I think that to get useful SPL ratings from a point source, that could be compared with other data, you need to measure the SPL at the more typical distance of 1 meter. However, most SPL data are referencing a 0db pressure level measured at 1KHz.
--Kyle Smith (AG2F)
73
-Braden
Hello Robert...
That "- Axial Power inductor, 1mH, LINK." will not do. That one is all I could source in Australia and will not produce ANY volume at all.Frequency output is correct but you need a better inductor than that one. I am awaiting one from digikey.com in the US and also one from Element14.com who have a local distributorship but that part they have to source from their USA supplier/branch. 1/2 Watt will not drive a 200W to 400W tweeter that well.
Try TDK-1mH-1000uH-1-1A-Power-Radial-inductors-5pcs-SL1215S-102KR51 but you'll have to buy 5. Better than the lots of 450 and 500 I last saw.
There is a separate thread for the Tweeter choices.
Wayne
So you're saying that all the other components I linked are OK? Even the 4.7 uF/25 V capacitors which are tantalum?
How about this puppy for a pre-amplifier for the microphone? I like the shutdown feature for power saving! I love the sound of 5nA!
Or better yet … this one is pretty cool …