diy ultrasonic cleaner, not using bought unit

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We all know about purchasing an utrasonic cleaner and putting a slow motor on it. Has anyone bought the transducers and fitted them to a metal bath and pumped the high frequency in to it. Or am I over simplifying things.
I have a few pcb's left from my AC sync motor control which my brother designed for me. Instead of putting out 50 hz it could be dialed up to 40k or what ever is required.
For the bath a commercial kitchen bain marie container is all the commercial ones use.
 
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