I’m trying to figure out a suitable oscillator circuit to produce longitudinal electric field waves (like in a Tesla Coil) to experiment and produce any mechanical or EM effects on various materials. A conductive sphere will be driven with AC. So the sphere will be pulsing with –q , +q , -q , ... with an isometric pure electrodynamic field with all magnetic field cancelled out.
A 50 Mhz fixed frequency oscillator circuit with weak or no harmonic distortion to oscillate relatively high amount of charges back and forth to a high capacitance sphere antenna (sphere, because i know the self-capacitance equation of a sphere only). I think a crystal/Pierce oscillator would fit best for a fixed high frequency without harmonic distortions. The problem is, I would need to oscillate high amount of charges (about 10^-5 – 10^-4 Coulombs) to produce a decent, mechanical or EM effect.
To drive such high amplitude of oscillations with peak voltages low enough to be safely measured even with a 10x oscilloscope probe, I would need a high capacitance oscillator circuit and I think that even if I connected many crystals in parallel, I would need thousands of them.
Could I use a thick crystal with low fundamental frequency and produce only a higher harmonic (50MHz) by a band-pass circuit? But then again, why would I need a crystal when I used a resonant LC circuit with high capacitance?
Also I would need to be able adjust the amplitude of the oscillations (amount of oscillating charges) which makes things even more complicated. Should I vary the collector voltage of the transistor or the resistance?
Any suggestions are welcome.