Wireless dc power and oscilloscope piezo disk tests

I think there'd be ways to enhance the distance, otherwise this probably just works well for short range. I guess they use AC small frequencies for wireless transfer like bluetooth, internet and phone, etc. That goes longer cause I think you tune the receiver to the same frequency as the sender.

Timestamps
Introduction - 00:00
Full bridge rectifier - 00:58
Explaining the circuit - 6:15
Trying it - 7:08
Multimeter tests - 8:18
RF meter on rf coil - 9:29
AC multimeter tests - 9:52
Piezo crystal disk and oscilloscope amplitude tests - 10:11
Using a speaker as a sensor - 14:07

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