What do you call that!!!? - Electronic Circuits Projects Diagrams Free

electronic mind · 11th March 2005, 04:08 PM

I heared once that there are some kind of Mic. that can catch the sound waves from someone who is talking in a distance of 10m or even more and by connecting the mic to a headphone you hear what that someone is saying .... is it applicable and if it is what is it called?? (Sonic Mic,, Directional Mic,....)

and does anyone knows a site that cntains a schematic or some info

David Bridgen · 11th March 2005, 04:19 PM

The microphones to which your refer use a reflector behind them, like the reflector behind a microwave antenna.

Google for "parabolic microphone" or "spy mic" or "eavesdropping mic".

zachtheterrible · 11th March 2005, 07:08 PM

as far as i know, there are two mics like this. the parabolic mic, like David said, and there is also the shotgun mic, which is a long mic with a bunch of different lengths of tubing in it that are (and i don't know if this is the right term) resonant for a certain frequency. so you have different tubes, each one that amplifies a certain frequency, so you can have a range of like 100HZ-5KHZ (that is totally guessed, just an example)

search for more info on google.

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11th March 2005, 04:08 PM	#1
electronic mind	What do you call that!!!? I heared once that there are some kind of Mic. that can catch the sound waves from someone who is talking in a distance of 10m or even more and by connecting the mic to a headphone you hear what that someone is saying .... is it applicable and if it is what is it called?? (Sonic Mic,, Directional Mic,....) and does anyone knows a site that cntains a schematic or some info

11th March 2005, 04:19 PM	#2
David Bridgen	The microphones to which your refer use a reflector behind them, like the reflector behind a microwave antenna. Google for "parabolic microphone" or "spy mic" or "eavesdropping mic".

11th March 2005, 07:08 PM	#3
zachtheterrible	as far as i know, there are two mics like this. the parabolic mic, like David said, and there is also the shotgun mic, which is a long mic with a bunch of different lengths of tubing in it that are (and i don't know if this is the right term) resonant for a certain frequency. so you have different tubes, each one that amplifies a certain frequency, so you can have a range of like 100HZ-5KHZ (that is totally guessed, just an example) search for more info on google. __________________ I'm no electronics god, i just talk too much.