Self running coil?

[gyulasun]

.....

Do you think if the pickup coils were tuned it would have less of a coupling effect with the primary coil?

Seeing this test 10 video do you think it is worth continuing?
....

Hi Luc,

First Q: No it would not have less coupling effect with the primary, unfortunately.

Second Q: Yes, another MOSFET type that has about 1/10 of the capacitance values than the IRF640 has would be worth trying.  Much useful input energy is comsumed in the rather high gate-source capacitance now.

rgds,  Gyula

[gyulasun]

...
#1 - I notice you have not produced resonance in the pickup coil
by adding a capacitor right across the coil before the diodes.

...
@mscoffman

Could you consider connecting the needed capacitor in series with the coil, not in parallel?
I ask this because a parallel resonant LC circuit has a high impedance at resonance and the most output can come out if you terminate it with a load that has the same value high impedance (condition for matching).
And even the CMOS 555 itself, together with driving the MOSFET, would not present a high impedance load that would be measurable to the LC resonant impedance.
By using a series resonant LC circuit, it has a low impedance 'output' (which is practically the pickup coil's copper resistance), this should be a more favorable generator output impedance for a load like even the CMOS 555.
The diode bridge of course can come after the capacitor too, one AC input goes to the series cap, the other AC input goes to the free coil end.

Can you agree with the series LC instead of the parallel one?

By the way if I saw correctly, Luc used a half wave rectifier, a single diode only for the pick up coil, but a diode bridge should be used, especially in the tuned case.

#4 - I am hoping you have full frequency agility with the NE555
to go where the overunity wants.

The CMOS TLC555 has a 2.1MHz typical frequency in astable mode, this is far better than the bipolar 555.

rgds,  Gyula

[mscoffman]

@gyulason and gotoluc;

I have an even better idea. If gotoluc happens to have a small audio
output transformers available. audio 10Hz->22Khz Should handle
the 35KHz sine wave ok.

Use the signal generator sine wave output at 35Kh to evaluate
the audio transformer to have some step-down ratio. then put
a 3K resistor across the secondary and drive primary from the
pickup coil. You'll want to maximize the voltage across the 3K
resistor. Using various different transformers, center taps and
so on. I'll bet you can get it significantly higher than the 4.2Vpp
it probably is now. We want to examine  6to1 stepdown ->
2to1 stepdown ratio range.

Then substitute the bridge rectifier leads for the 3K resistor.
We probably have an impedance mismatch between that
coil and the NE555 + gate. NE555 + gate ~= 3Kohms. That
is wasting energy. This is based on the 60Vpp? on the
pickup coil unloaded. The coil should be operating closer to
this value but we are just pulling it down.

I we get it to 11Vdc or higher we should use the variable
potentiometer in series with the gate idea to trim it.

:S:MarkSCoffman

[Magluvin]

Are we talking about using an audio transformer to isolate the sig in to the fet gate?

I see the transformer as a pump of sorts and power on the input actually transfers power to the other side. Its a power in power out kinda thing. ;]

The optical is the best way. Imagine, we have optical sending internet, so freq is not an issue, and quality of signal conversion should be good also.
I have to say that all that is needed is a mosfet driver that is triggered by the optical device. And if it is 50% duty and a square wave, it should work perfectly.

I also imagine the use of a zener to keep the voltage on the charge cap leveled out at some point.

Mags

[LightRider]

Finally, with a similar setup, the observed effect seems to be reproduced.

Input signal (Fonction generator model : GFG-8019G) @ 39.6 kHz - 8 vpp (square)
the circuit works on a 9v battery.
Adjustments and measurements made with an old 20Mhz Dual Trace Oscilloscope (ET & T 3132)
9.10v in the cap -> goto a maximum 12.10v (when disconnected) in a few seconds and stays there.

(a video is possible if necessary)

...under testing...

LightRider