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Old 28th September 2012, 01:46 PM   #1
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Default Generate a 44 KHz sine wave

Hi everybody, I would like to know how can I generate a 44 KHz sine wave with my computer. This is for cleaning purposes (Ultrasonic cleaner)

As far as Im concerned, most of programs like soundforge, audacity or Tone Generator (Tone Generator Software - Audio Test Tone and Sound Frequency Generator) let you generate a sine wave but the maximum value is aproximately 22 KHz.

I own a capable sound card which sample rate reaches the 96 KHz. I think there should be a way to do this.

Could somebody help me please?

Thanks a lot!

Leandro F.
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Old 28th September 2012, 04:19 PM   #2
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A Square wave maybe if create it yourself sample by sample.
It would much easier using an opamp for a sine wave or a 555 timer for a sqaure or sawtooth wave.

You don't have a high enough sample rate to create a decent sine wave with only 2 or 3 samples per cycle.

jer

Last edited by geraldfryjr; 28th September 2012 at 04:23 PM.
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Old 28th September 2012, 04:32 PM   #3
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Thanks for your response!!! Is there a tutorial which explains how to do that? I dont have much experience with waves
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Old 28th September 2012, 04:39 PM   #4
Mooly is offline Mooly  United Kingdom
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To do any of this requires assembling a few components to make an oscillator and I'm guessing (maybe quite wrongly ) that you haven't done much like this before. There are always ways and means though. A small 9 volt battery powered design is probably quite feasable and component cost would be minimal.

As you were thinking of using a soundcard and PC I assume you need a low level (say 1 volt) signal at 44Khz. Is the frequency super critical ? I suspect not for driving ultrasonic transducers.
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Old 30th September 2012, 02:18 AM   #5
Simon B is offline Simon B  United Kingdom
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Not really audio......

You don't say anything about what transducer you intend to use, or give its specs, but I can't imagine using a soundcard is going to do anything much useful for you that couldn't be done much more easily by other means.

Usually transducers for cleaning are piezo with high Q, so frequency is fairly important, self-resonant (and thus self tuning) drive signal generation is often employed. Power levels are high compared to soundcard outputs, and the frequencies usually beyond audio amp capabilities. Waveforms applied are usually square.

Take a look at these:

Ultrasonic Cleaning Transducer--Ultrasonic Cleaning Transducer from Beijing Yongda Ultrasonic

http://jumperone.com/files/2012/02/u...ic_Cleaner.pdf
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