"kanadanmajava1" (kanadanmajava1)
03/09/2018 at 10:16 • Filed to: None
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"kanadanmajava1" (kanadanmajava1)
03/09/2018 at 10:16 • Filed to: None | 0
| 6 |
I rescued an old ultrasonic washer from our company’s recycling bin. It’s old and broken but the tank is nicely sized and the power rating is nice (375 W). I opened it and took out my multimeter.
The ultrasonic transducers seem to fried and they aren’t conducting anything. Correct me if I’m wrong but I think that there should be some resistance over them. But in case they all look like fried ones.
I tested the driver board with some random “multimedia speaker” and some noise do come out from the speaker. My multimeter couldn’t read anything from the output lines but this should be normal as the frequency is way out my multimeter’s range.
Then the actual question. The device is using 48 kHz frequency. All reasonably priced transducers seem to be running at 40 kHz. There were some transducers in 50 or 48 kHz range but the prices were annoyingly high.
So would cheap 40 kHz transducers work with a system running at 48 kHz?
eBay seems to be offering quite cheap driver boards too but they start to get expensive after 100 W. And I doubt that wiring several sets in parallel would work at all.
diplodicus forgot his password
> kanadanmajava1
03/09/2018 at 10:53 |
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I believe that’s the output frequency, so everything else equal your cleaner would just emit 40khz instead of 48khz. What effect that would have on your cleaning abilities idk. It doesn’t use the transducers for sensing at all does it?
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diplodicus forgot his password
> diplodicus forgot his password
03/09/2018 at 10:56 |
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Also you would need to use an oscilloscope with the trasnducers powered up to know for certain they’re bad.
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kanadanmajava1
> diplodicus forgot his password
03/09/2018 at 11:04 |
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I don’t think that I does have any kind of sensing capabilities. The circuit seems to be made without any logic. According to datasheets the transducers usually have some kind of optimal resonance frequency.
But does the efficiency drop dramatically outside some narrow band? I might be thinking too much about audio speakers but usually the suitable band of these is somewhat wide. 40 kHz isn’t very far away from 48 kHz.
Of course if I would study the cirquit thoroughly it could be possible to alter the frequency of it. the wiring seems to be very easy to “read” from the PCB.
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diplodicus forgot his password
> kanadanmajava1
03/09/2018 at 11:33 |
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Wait which transducers do you think are bad? The generator transducers or the ones in the tank.
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kanadanmajava1
> diplodicus forgot his password
03/09/2018 at 15:49 |
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The ones on the bottom of the tank. They look bad and I cannot get any resistance.
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diplodicus forgot his password
> kanadanmajava1
03/09/2018 at 17:26 |
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Are they powered up?
No idea what that would cost you but that xit-4010 seems like itd work for you.