3v OU Flashlight

[TinselKoala]

I think this guy found something  useful too.
https://www.youtube.com/watch?v=Ql2zfs5vevM

Yes, that's interesting. I like Grumage's experimental attitude.

Also interesting is what happens when I increase and decrease the gap in the ferrite core above.... the amplitude of the signals does NOT vary, but the _frequency_  of the sinusoid and the bursts does. Larger gap, higher frequency. I interpret this to mean that the inductance I am using (number of turns) is really too large. I am seeing my effects in the scopeshot above at 1/5 the frequency of the Akula scopeshot effects, and if I didn't have the wooden spacer in the coil, it would be at 1/10 the frequency of Akula's.

[lost_bro]

my English is bad but I'll try to explain that you have no chance to tune Akula's  device if you don't know how it works. I hope Wesley  will  translate latest Akula's conversation on skype. but in short, Akula's devices is working on core resonance. It's different cores - different resonances. for example one Akula's core have 3,5 Ghz resonance. transistors switching time need to be shorter than this frequency. the high and low frequency generators need to be harmonics oscillators on  cores resonance frequency.
from start you need to find  core resonance that you have.
the transistors switches need to be switch on-off in one time
and there is more what to be explained but I hope somebody do better than me

Hello All:
I believe this to be relevant concerning ferroresonance and dimensional resonance:
and in relation to AC power systems:

"Ferro-resonance can generate overvoltages of upto 12 times line to ground source voltage upon opening a single phase device or poorly synchronised 3 phase device. Voilent failure can occur exposing personnel to the high voltage failure and accompanying conditions. Ferro-resonance conditions can result in damage to lightning arresters, switching devices, buried cable, transformers and associated equipment.
Ferro-resonance can be initiated when all of the following elements are present and the switching means at the dip point or takes off when a single phase device or an unsynchronised 3 phase device that does not operate all phases within 1/2 cycle.
1.System grounded at the source, but with no ground at the transformer bank
2. Shielded cable length or overhead conductor length sufficient to create the capacitance necessary
3. Transformer size that permits saturation of the iron core at the operating voltage
4. Transformer unloaded or lightly loaded.
Prevention or control of ferro-resonance can be by:
1. Using wye-wye transformer withboth neutrals grounded and tied to systems neutral
2. Using only phase-to-neutral (not phase-to-phase) transformers connections for single pahse transformers.
3. Limiting length of underground cable
4. For poorly synchronised switching devices, extra resistive load of 2% of the transformer capacity on underground cable. "
Ref:www.tpub.com/doeelecsafety/electri... safety

Food for thought, and it does correlate with the Russian stories of the cores self-destructing after a short runtime:

take care, peace
lost_bro

[hartiberlin]

Well done TK, so what about the Secondary coil ?
What voltage and current can you get from it ?
Do you feed this spikey signal to the primary of the flyback transformer
and is the pure sine wave then at the secondary ?
Can you bridge rectify the secondary and feed it back to the input then ?

Many thanks.

Regards, Stefan.

[TinselKoala]

Well done TK, so what about the Secondary coil ?
What voltage and current can you get from it ?
Do you feed this spikey signal to the primary of the flyback transformer
and is the pure sine wave then at the secondary ?
Can you bridge rectify the secondary and feed it back to the input then ?

Many thanks.

Regards, Stefan.

The circuit is wired exactly as Akula's schematic below, except that I added a 2.2 pF ceramic capacitor across the 3.3K resistor.  (And my big input reservoir cap is 3300 uF not 2200 uF.) I have the smaller of my inductances (about 6 milliH) connected to the 34063 side and the larger (about 20 milliH) connected to the 4069 side. I am using BUZ11A mosfet, CD4069CN from National Semiconductor, MC34063API from ON Semi. One blue and one white LED.

The system is very sensitive to input voltage, potentiometer setting and coil ferrite gap (thanks for suggesting I look at varying this gap). Also coil phasing, we are all used to swapping connections of one coil if it doesn't "work" the first time, right?

The spike voltage on the top trace is set by the pot and the DC_DC chip's other components, but the range of "tuning" to see this waveform is so narrow that the spike voltage does not vary in that range. It maxes out at about 2.5 times input voltage. Akula's "80 v p-p" here must be from setting his probe/scope attenuation incorrectly, as I am seeing exactly 1/10 that value at maximum.

The sinus waveform can be gotten to make a little more voltage than is shown on the scope but then the top trace changes as well, by reducing the length of the bursts of oscillation, and if the pot is turned too far in either direction the sinus flattens out and no bursts happen.
I don't think it can be connected differently or looped back in the way you are thinking.

I think that the inductances I'm using are too large, which accounts for the slower main frequency I'm getting. I think this, because when I separate the core halves, the frequency of the sinusoid goes up and up, until the cores are too far apart and the thing stops working.

The ferrite I am using is from a TV flyback transformer. It is conductive, measuring almost exactly 50 ohms per centimeter on the surface, contacted with point probes. The coil bobbin inner tube is a brass tube and it is in contact with the ferrite and connected to the inner winding as well.

But it still goes straight to DC and fades out in a couple seconds when I pull the input power  plug.

[d3x0r]

Your copper foils are wrong...


watch the video again, they're both connected on the secondary. (secondary being the lower uH coil)

the first cut he makes; the outside foil; leaves a short wire; 


This is the start of the unwind of the secondary.  The primary has two long leads on it that he start to unwind and finishes with; without connection tot he copper foil