----- Original Message ----- From: Madhu Annapragada To: Sent: Wednesday, April 07, 2004 4:01 PM Subject: Re: [OT]: Ultrasonic cleaner > 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 Don't you have to be carefull about the frequency and power? Isn't there a problem with pitting at the surface of the object to be cleaned? Regards Sergio Masci http://www.xcprod.com/titan/XCSB - optimising structured PIC BASIC compiler -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics