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I really don't know why people have a hard time grasping this and keep going back to the little microphone not being able to supply enough power to do anything.
I believe what it would do would be to take a signal that is in the environment, any signal, let's take one that's pumping out 100 thousand watts from an AM or FM station near you. You have a coil that is tuned to that precise frequency inside a box that collects any power that is passed through that coil or antenna. Now it's not the only one coil, there are probably twenty or thirty of them. They take that power that is coming off the wire antenna and pass it to a capacitor or something equivalent.
Just like the crystal radio, there is enough power to know you have power. Now multiply that power times how many antenna's you have wound up at the precise frequency of that station. And to boot you have transistors or a more modern day version that amplifies this signal. This is not rocket science and you don't have to be highly intelligent to see that there is a power source and that it can be harnessed. Although some may say that it won't work because of the theory, have gone to the old school where you are taught to listen and not question the teacher.
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Piezo materials produce electrical energy as a result of pressure (sound pressure for example) and are not susceptible to loading. Their output is very small, however.
Originally posted by majestictwo
Haven’t read the whole thread but the best wave to harness is in the ocean it has a tad more energy than a microphone and solves the load problems.
MJ2