Exceed 30 Khz

[Adrian_Arg.]

I need a speaker or other element that can reproduce in 30 Khz and 40 Khz, since the speakers I have do not exceed 21Khz ..





Necesito un parlante o otro elemento que pueda reproducir en 30 Khz y 40 Khz, ya que los parlantes que tengo no superan los 21Khz..

[oPossum]

Search for "ultrasonic transducer" and "ultrasonic distance sensor"

[Gyro]

Piezoelectric and ribbon tweeters are often capable of significantly exceeding 20kHz - I don't think your ears can though!

As oPossum says, ultrasonic transducers are available that run at 40kHz and, I think, some maybe 32kHz but these are very narrow band tuned and not suitable for any other purpose (apart from bat detectors).

[cliffyk]

[cliffyk]

Piezoelectric and ribbon tweeters are often capable of significantly exceeding 20kHz - I don't think your ears can though!

As oPossum says, ultrasonic transducers are available that run at 40kHz and, I think, some maybe 32kHz but these are very narrow band tuned and not suitable for any other purpose (apart from bat detectors).

The typical Arduino ultrasonic rangefinder module operates at 40 kHz.

They can be had for < $5.00 on Amazon.

[Brumby]

The KEY question is whether you want a device to operate at one, specific frequency in that band - or whether you want to operate over a range of frequencies within that band.


Secondary question is one of curiosity (especially if wanting to operate over a range of frequencies) ... what is the application?

[CatalinaWOW]

Depending on what you are doing, your existing speakers may work.  The rating on speakers tells where their output drops below the in band value by some amount.  Usually 3 or 6 dB.  If you drive them hard there will still be output for quite a few kHz above that value.  Electret microphones usually work somewhat to very high frequencies, though their response may vary by 10 dB or more over the ultrasonic range.  You could try your speakers out and see if they are suitable for your application.

[magic]

The rating on speakers tells where their output drops below the in band value by some amount.  Usually 3 or 6 dB.

Maybe if you buy them at Mouser
AFAIK, the ratings on speakers, and certainly on headphones, are completely devoid of any meaning whatsoever other than more usually means more within the same product line of the same manufacturer.

[CatalinaWOW]

The rating on speakers tells where their output drops below the in band value by some amount.  Usually 3 or 6 dB.

Maybe if you buy them at Mouser
AFAIK, the ratings on speakers, and certainly on headphones, are completely devoid of any meaning whatsoever other than more usually means more within the same product line of the same manufacturer.

What you say is true but it doesn't negate the point.  Even the worst dreck will have some output at 30k.  Whether it is enough to be useful will depend on the specific speaker and the OPs needs.