Rene/Meissner EMF Higher Voltage Charger Variant

[SkyWatcher123]

Hi all, tested that coil and i was noticing some heat in the NPN transistor and could not tune the circuit to remove the heat.
So i went back to the larger 12 strand coil/core, which now has a little less copper turns and it stays cool and all components stay cool.
Since the coil is integral with the function of this oscillator ciruit, maybe too few turns or too low of resitance does not operate the circuit properly or the transistor being used cannot handle the pulse amps and causes heat.
I still may try the 10 or 12 gauge house wire coil, because I'm curious to see how it may perform.
peace love light

[SkyWatcher123]

Hi all, I've been testing some different coils.
Found some plastic insulated wire, looks similar to speaker wire, though i think its hook up wire, looks like maybe 20-22awg. stranded copper wire.
Wrapped 3 layers directly onto the ferrite tube core.
Since the wire is built with wire side by side, I wired it series, Nikola Tesla style, from patent #US512340A.
This N. Tesla coil method, apparently raises the capacity of the coil and voltage between turns, cancelling self induction.
I'm using the no heat sink method to check if too much heat is generated in transistors and this coil has no heat issues anywhere and charging performance is good.
The coil is .5 ohms total resistance wired in series.
I will make a charge/load test with this coil, using the lithium ion battery as the charge battery again.
peace love light    

[SkyWatcher123]

Hi all, here's a pic of the latest setup being tested.
Going to do the charge/load test today, with the lithium ion battery.
peace love light

Edit: Ok, made a charge/load test and this coil is a little less efficient, though that may be because the coil resistance is more than double the other coil at .5 ohms.
It worked out to around 104% with this hook up wire coil.
Edit 2: tuned the circuit a little and making another charge/load test.

[SkyWatcher123]

Hi all, the second charge/load test with the hook up wire coil came out the same, 104% or 1.04 COP.

Going to test the 12 strand coil/core again, since it now has a little less resistance from removing some turns.
peace love light

[gyulasun]

...
This N. Tesla coil method, apparently raises the capacity of the coil and voltage between turns, cancelling self induction.
...
The coil is .5 ohms total resistance wired in series.
...

Hi SkyWatcher,
Would like to return to this mail of yours, namely your "cancelling self induction" statement.   

Ii is okay that the winding method Tesla described increases winding capacitance.  However, this in itself
is not yet enough to cancel self inductance because the frequency of the input current has to be considered.

If you start to sweep the frequency of the input current from a few Hz and go higher and higher, then the X_L
reactance of the self inductance of the two series windings will gradually be reduced by the increasing shunting
effect of the X_C capacitive reactance of the winding capacitance.  Then there comes a single frequency where
X_L=X_C and this is what Tesla described as the condition that  I quote "permits a current of given frequency and
potential to pass through it with no other opposition than that of ohmic resistance, or, in other words, as though
it possessed no self-induction." 

That is, if a bifilar coil that is made of say two insulated and relatively long copper or Alu foil stripes sticked to each other
and the stripes are connected in series to form the coil, will have a resonant frequency say at 92 kHz then this same coil
will behave as any other coil would at the lower than 92 kHz frequency range and will have the usual inductive reactance. 

In case of using two normal enamelled copper wire for the bifilar windings, then the resonant frequency will be much higher than my randomly chosen foil example of 82 kHz of course.
So it is possible that in your latest test with the plastic insulated dual wire connected in series as per Tesla, the resonant
frequency of that coil may be in the some hundred kHz range while the oscillator circuit frequency may be at a lower than
that frequency.  So we do not know whether there is any advantage by this kind of coil or not... sorry for noticing these. 
It is good your efficiency  numbers comes pretty close to that of the 12 strand coil.
Thanks for your efforts.
Gyula