sonic ear or the like?? - Electronic Circuits Projects Diagrams Free

phishinalong · 30th January 2003, 07:22 PM

Hey everyone! I want to build my own sonic ear or some sort of listening device but I am having trouble finding a plan for one. Does anyone have one or know what I need to do to build this thing? ANy help would be greatly appreciated! Thanks a lot.

john1 · 31st January 2003, 12:40 AM

Hi phishinalong,

Is this the sort of thing you mean?

http://www.pimall.com/nais/e.sonic.html

It seems like a directional microphone.

John

phishinalong · 31st January 2003, 12:57 AM

yeah thats what i'm looking for. Do you know how to construct one of these or a link that says how to make one?

john1 · 31st January 2003, 01:20 AM

Hi phishinalong,

The principles are pretty standard for directional mikes.
If its for higher frequencies such as birdsong
then the cardboard centre of a toilet roll might do ok,
If its more for conversation filtering,
like picking out people from a crowd,
you would need a longer, and maybe wider tube,
to pick out from the surroundings.

You can follow speech with just the higher frequencies,
but it takes practice, and it sounds awful.

This kind of unit depends more on physical construction
than electronics, unless there have been some curious
advances made in this field that i dont know about.

I did hear about an evesdropping device that used a laser
which was modulated, and could be beamed through a
window into a room then shone on a surface such as a
picture, or thin item that would be expected to respond
to sounds in the room,

Then also a laser sensitive unit would be focussed on
that place, and the variations of its pick-up from
the modulated laser would be reproduced as sounds from
within the room.

This unit was alleged to give legible conversations
from up to a half a mile through the window of a room.

I have never seen such a device, but i was told they
are commonly known in circles that use them.

As to directional microphones,
thats more a constructional project
than electronic.

Best of luck with it,
John

john1 · 31st January 2003, 01:39 AM

Hi phishinalong,

Maybe the centre of a kitchen roll of foil
would do, its a bit longer than a toilet roll

See what others say, there might be more
ways to do this than i know about.

John

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30th January 2003, 07:22 PM	(permalink)
phishinalong	sonic ear or the like?? Hey everyone! I want to build my own sonic ear or some sort of listening device but I am having trouble finding a plan for one. Does anyone have one or know what I need to do to build this thing? ANy help would be greatly appreciated! Thanks a lot.

31st January 2003, 12:40 AM	(permalink)
john1	Hi phishinalong, Is this the sort of thing you mean? http://www.pimall.com/nais/e.sonic.html It seems like a directional microphone. John

31st January 2003, 12:57 AM	(permalink)
phishinalong	yeah thats what i'm looking for. Do you know how to construct one of these or a link that says how to make one?

31st January 2003, 01:20 AM	(permalink)
john1	Hi phishinalong, The principles are pretty standard for directional mikes. If its for higher frequencies such as birdsong then the cardboard centre of a toilet roll might do ok, If its more for conversation filtering, like picking out people from a crowd, you would need a longer, and maybe wider tube, to pick out from the surroundings. You can follow speech with just the higher frequencies, but it takes practice, and it sounds awful. This kind of unit depends more on physical construction than electronics, unless there have been some curious advances made in this field that i dont know about. I did hear about an evesdropping device that used a laser which was modulated, and could be beamed through a window into a room then shone on a surface such as a picture, or thin item that would be expected to respond to sounds in the room, Then also a laser sensitive unit would be focussed on that place, and the variations of its pick-up from the modulated laser would be reproduced as sounds from within the room. This unit was alleged to give legible conversations from up to a half a mile through the window of a room. I have never seen such a device, but i was told they are commonly known in circles that use them. As to directional microphones, thats more a constructional project than electronic. Best of luck with it, John