Is there an ideal frequency for resonance of a coil to get the highest voltage out?

Please watch the video first before you comment. This video is made for people that do experiments with electronic circuits, trying to find “overunity” effects.
I see this question everywhere (YT channels, world wide web, etc.) especially when people try to build resonant electronic circuits, searching for “Overunity” (e.g. the Don Smith circuits, etc).

That question is: “what is the most ideal frequency for resonance of a coil, meaning the highest voltage out at resonance”.

On the basis of all kinds of overunity hypotheses it is often thought to be around 33 KHz or so.

My answer is that there is no special (most ideal) frequency where the highest voltage out can be taken out of a coil or other resonant electronic circuit. It all depends on the wave properties/physics. In fact on all radio frequencies there are constructions possible to realise a high voltage out when the circuit is in resonance. These constructions (how they are made) depend on the used frequency and the wave-properties of that frequency. Wave properties are key. Could be a flyback coil for a TV (say 16-18 KHz), a magnetron, a smartphone that sends out radio waves in the Gigahertz range, a radar, a radio transmitter on Shortwave or medium waves.

Engineers develop oscillators for all kinds of purposes, and when it is necessary to optimize a radio transmitter and get much energy out of a resonant circuit they use constructions that are at optimal adapted to the wave properties of a certain frequency or frequency band. So the wave properties are key and they differ very substantially (!) over the whole radio band, say from 20 KHz to xx Gigahertz.

The construction of a radar is completely different to that of a Shortwave transmitter, but they both often (try to) send out maximum energy on their specific frequencies.

I tried to demonstrate one (1) effect to optimize a tank circuit (parallel resonance). That effect is that, in general, an L-C tank circuit has a sharper resonance peak on frequency X when the coil has many windings and the parallel capacitor is small. Call it: “a high L factor”. A coil with less windings and a higher value parallel capacitor shows a less sharp peak resonance and less “energy output” on that frequency. This effect (tuning) can also be realized in other ways: compare a 455 Khz IF filter where the electromagnetic effect of the ferrite core makes it possible to tune that filter coil to a sharp “peak” resonance=high output level. I showed 3 coils with different properties, all working on 1,5 MHz.

Coil A: less windings-high value capacitor (980 pF)
Coil B: many windings, low value capacitor (57 pF)
Coil C: only many windings, thin wire (capacitor=parasitic at the Gate of the FET)

NB: The parasitic parallel capacitance at the input of the FET oscillator (watch video & schematic) plays a role.

Measured results, output voltages: coil A=7,6 Volt, coil B=9 Volt, coil C=9,2 Volt. Better results (=bigger differences) are (perhaps) possible when the circuit is optimized.

There are 2 earlier video’s (with schematics) for the test-oscillator showed here:
Getting more insight in radio coils
FET test oscillator
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Be aware of that, I saw on the internet my circuits reproduced in a poor or not proper way.

I also found that people probably republish my circuits under phantasy names and/or with phantasy properties. E.g. they want to find gold with them. I take distance from all these fake claims; I cannot help that it happens, sorry. Upload 13 november 2019.
Relevant earlier video

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