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I'd like to clarify that this isn't really a plastic, at least as you'd normally think of it. This is really a sort of composite material. I've done similar with cyanoacrylates and epoxies using baking soda or glass powder (respectively). Very nice Instructable though! You explained everything well and were very thorough when you were testing your batches.
High Voltage Power Supply For Marx Generator
I suppose that would work too. The audio amp let's you put in any waveform though and from a low current/voltage source. You could use say an Arduino or RPi for smart control or something. Your idea is definitely simpler though if you just want something you don't need/want to tune in the future. I don't know enough electrical engineering though to say if using the transmitter coil as the inductor would totally work. Maybe the load from receiver would mess with the resonance or is that even something that can happen?
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I mean using an LC as the signal source for the audio amp. You wouldn't need a phone or computer then, but I guess that makes it harder to tune the coil too.
Instead of using some sort of computer to generate an audio sine wave, maybe you could use an LC circuit. They're fairly simple and you could have a self contained system. Thoughts on that?
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