I want to make a PCB vibrate at ultrasonic frequencies like in the TI's lens cleaning demo video.
Is it possible to make a PCB vibrate by pulsing the PCB traces at high frequencies?
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NEC 300.3 and NEC 300.20. These are rules to minimize vibration from electrical wiring in buildings. Normally I don't advise violating the electrical codes, but... brak all those rules :)
Yeah, it's just a matter of coming up with a coil on the PCB. The biggest trick would be routing the current so it all flows in the same direction. Then have something for it to react against, e.g. another PCB.