I just finished designing one at work (none of the COTS met specs..) and the
frequency was 60KHz, at 50W. I had a PLL and  FETs doing the switching. It
will be used to clean up DNA from specially coated stainless tips on a
machine. I have seen cleaners go as low as 40KHz. From what I understand,
the finer the particles you need to break up the higher the frequency. The
wattage of course depends on the amount of cleaning fluid in the tank. This
web site (among others) has some good technical links:
http://www.bluewaveinc.com/
Madhu

>-----Original Message-----
>At 01:53 AM 4/7/04, you wrote:
>>Hi list,
>>
>>Has anyone of you dismantled a cleaner (desktop type) ? Which frequency is
>>used ?
>>
>>I have never seen one from the inside (yet) , but I guess it works more or
>>less just like a loudspeaker, with a stainless steel tray instead
>of the cone ?
>>
>>Is the frequency critical, or would any ultrasonic frequency do ? How much
>>power is needed ? More for a big tray, less for a small, I guess...
>>
>>Regards
>>
>>Attila - SM4RAN
>>

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