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Reduce transducer power for ultrasonic bath?

Discussion in 'General Electronics Discussion' started by smilem, Nov 12, 2013.

  1. smilem

    smilem

    61
    0
    Jan 5, 2013
    Hello, I would like to reduce transducer power for ultrasonic bath.

    1. I could use analog simple wirewound pot I think.
    I would have to measure amps, volts, then see what power pot I need. This would allow to pass the 25Khz signal to transducer unaltered right?

    2. I could use some sort of fancy electronic control with nice display for volts, but what?

    If they would hold the power needed would the controls like this work:

    http://www.ebay.com/itm/Adjustable-...al_Components_Supplies_ET&hash=item1e82527f23
    http://www.ebay.com/itm/NEW-5V-30V-...923?pt=LH_DefaultDomain_0&hash=item19e08df07b

    Would I still get the 25Khz output to the transducer?
     
  2. Laplace

    Laplace

    1,252
    184
    Apr 4, 2010
    Whether a wirewound pot would work depends on the type of oscillator and transducer used. If it is a ceramic crystal transducer and resonant oscillator circuit that depends on the phase shift of the crystal at resonance, then introducing a wirewound resistance in series with the crystal may change the characteristic impedance at resonance so that the oscillator will then fail to perform. However, if the oscillator is operating independently from the transducer and driving an amplifier that powers the crystal, then your idea is likely to work.
     
  3. smilem

    smilem

    61
    0
    Jan 5, 2013
    The model is Proclean 507, how do I know if it is

    1. ceramic crystal transducer and resonant oscillator
    2. oscillator is operating independently from the transducer
     
  4. smilem

    smilem

    61
    0
    Jan 5, 2013
    Here are the photos, what a shocker they (ulsonix) assembled it very dangerously.

    Should I clean the flux even more?

    Photo01, very dirty PCB.
    http://i.imgur.com/nme7BXL.jpg

    Photo02, dangerous assembly
    http://i.imgur.com/9MnLxCo.jpg

    Photo03, Back of PCB
    http://i.imgur.com/l4d3kL5.jpg

    Photo04-09 PCB (should I clean it even better?)
    http://i.imgur.com/QTwWi7z.jpg
    http://i.imgur.com/5oeXFLL.jpg
    http://i.imgur.com/63sY48P.jpg
    http://i.imgur.com/NiQuyXE.jpg
    http://i.imgur.com/hPgr3YS.jpg
    http://i.imgur.com/Fb5gyLE.jpg

    I added insulation to the bottom
    http://i.imgur.com/wik2cqm.jpg
     
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