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unidirectional audio speaker. Design discussion Answered

I was thinking of designing a unidirectional speaker driver circuit.
As far as I know ,I need to drive the speakers with audio signal with ultrasound carrier wave...
I thought of making a circuit that generates 20/16 Mhz (1.25mhz) square wave? using 4060 ic and 20 mhz crystal and using optocouplers to torn on and off the speakers at same frequency.

do you think it is going to work?


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