Build your own ultrasonic audio laser, otherwise known as an ultrasonic parametric speaker that lets you beam sound to distant places like a laser beam. Total cost is under $20! Parts List: ----------------- (17) TCT-16T 40Khz Ultrasonic Transducers TCT40-16T - https://www.aliexpress.com/item/32258563531.html (1) STM32F103C8T6https://www.aliexpress.com/item/32862385518.html (1) LM358 (DIP-8) - https://www.aliexpress.com/item/32972282817.html (1) TC4427A - https://www.aliexpress.com/item/32967076106.html (1) PJ-307 Line-in Audio Jack - https://www.aliexpress.com/item/1000006982803.html (1) MT3608 DC Step-Up Module (optional) - -https://www.aliexpress.com/item/4000155588081.html Code and schematics: ------------------------------------ https://github.com/gururise/directional_speaker 0:00 - 0:56 Intro 0:57 - 2:51 History 2:52 - 5:05 Implementation 5:06 - 10:26 Part Details 10:27 - 10:57 Circuit 10:58 - 12:57 Usage 12:59 - 13:53 Conclusion #parametricspeaker #ultrasound #audiolaser