On Sat, 16 Aug 2008 05:20:21 +0300, "Yianni" put
finger to keyboard and composed:
Is there is a patent reference on the label? If so, then you can
sometimes find a how-it-works explanation at ...
I don't know, I suspect not because is an inexpensive chinese model.
This URL claims that the design is patented, hence my question:
http://www.codyson.net/cd-2800.html
There is sometimes a patent number on the rating sticker.
If you read the text of the various inventions, it appears that they
all use a 40kHz piezoelectric transducer driven by a two-transistor
oscillator. One patent states that "the oscillation frequency is
dependent mainly upon the characteristics of the piezo element". I
think what you are trying to do is akin to changing the natural
oscillation frequency of a quartz crystal by playing around with
external components, ie it makes no sense.
The transducer is not as these you referred to the other post. These
transducers are the "professional" transducers. This in the specific
ultrasonic cleaner is more like a buzzer than a conventional transducer.
It's diametre is twice than a conventional buzzer. Of course there is a
small possibility to resonate to a specific frequency, but I think not. The
reason for that, is that another model has just a NORMAL buzzer same as this
for beeps. Of course both ultrasonic cleaners -I mentioned- are inexpensive
chinese models with low power. A "normal" ultrasonic cleaner I have had, in
15 seconds it cleaned the same as these cheap cleaners in 5 minutes.
The power spec for your cleaner is 35W @ 110V and 50W @ 220V. That
seems on a par with the "professional" transducers above. shrug
This is the "big" buzzer http://www.inkline.gr/temp/Photo%20021.jpg .
How about these "buzzer" shaped transducers:
http://www.annon-piezo.com/product/P...ic-cleaner.htm
They all have a well defined resonant frequency.
Epoxy
glue (black) is used to fit on the metal tank. The glue and the metal tank
should decrease much the resonate frequency. (Another fact for possible not
resonance).
I also wondered about that. I don't have an answer, though.
The green area is not the oscillator
http://www.inkline.gr/temp/Photo%20019.jpg .
Yes I am aware of that.
- Franc Zabkar
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