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how does one make a whistling key finder, i.e, you whistle, it whistles back Answered

Basically, when you've lost your keys, all you do is whistle and it whistles bach at you. What materials would i need for such a project.

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causffect
causffect

11 years ago

how do you make a eectric keyfinder i want to make one myself i know i need a piezobuzzer what else