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Topic: Arduino to Amplifier to Ultrasonic Transducer (Read 1 time) previous topic - next topic



I am trying to build an ultrasonic levitator using an Arduino and an ultrasonic transducer.  I want to power a 40 kHz 50W transducer that requires 110 VAC (with an internal impedance less than 20 ohms).  My knowledge of EE is limited and I'm having trouble finding the right kind of amplifier and/or if there's a better way to power the transducer. At this point my plan is to use the Arduino to create the sine wave of the appropriate frequency (40kHz) or a square wave pulsed at 40 kHz and then amplify the signal with an amplifier of some sort to reach the 110 RMS needed to power the transducer. Is this something that seems reasonable, and does anyone have any ideas for which amplifier might be appropriate?

My concern is that to create the 110VAC output, I think I'll have to supply the amplifier with 170VDC at Vcc to create the amplified sine wave. For testing I would use a tabletop DC supply, but later I'd like to plug into the wall, which will require rectifying wall power to the 170VDC. While that seems doable, it also seems like it would be a bit dangerous. I'm familiar with working with high voltages, but if there is a better option that anyone can think of, that would be great. Thanks very much!


Google 'NE555 oscillator' or 'NE555 astable' (LM555 is same thing), 'optoisolator' and 'Triac'.
Hazardous project.  Beware of LETHAL currents and voltages (i.e. don't try this at home,,, unless you KNOW what you are doing).

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