I’m (trying to) building a ultrasonic cleaner for cleaning PCBs.

I have 2 ultrasonic 100W 28khz PZT transducers connected in a parallel fashion.

link: http://postimg.org/image/aksjbdtuv/

C7,C8,C9,C10,R5,R6,L4,L5 form the equal vent of the transducers.

The resonance frequency of the transducers seems to be f = 28659.9hz.

Therefor the circuit should operate at this frequency.

To compensate for the capacitive of the transducer I have added a inductor L3.

According to the math the impendence of the transducers with the compensation coil would be Z=3.445 ohm.

So the secondary of the transformer (L1,L2) should be 3,445 ohms?

Then the inductance should be 19.13085395µh.

Please ignore the primary halve of the circuit it is not calculated, the values do not make sense.

Can anyone confirm I’m on the right track here?

I’m in a learning phase so please be patient.

I have 2 ultrasonic 100W 28khz PZT transducers connected in a parallel fashion.

An externally hosted image should be here but it was not working when we last tested it.

link: http://postimg.org/image/aksjbdtuv/

C7,C8,C9,C10,R5,R6,L4,L5 form the equal vent of the transducers.

The resonance frequency of the transducers seems to be f = 28659.9hz.

Therefor the circuit should operate at this frequency.

To compensate for the capacitive of the transducer I have added a inductor L3.

According to the math the impendence of the transducers with the compensation coil would be Z=3.445 ohm.

So the secondary of the transformer (L1,L2) should be 3,445 ohms?

Then the inductance should be 19.13085395µh.

Please ignore the primary halve of the circuit it is not calculated, the values do not make sense.

Can anyone confirm I’m on the right track here?

I’m in a learning phase so please be patient.

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