3v OU Flashlight

[TinselKoala]

hi,

What about adding 100nf capacitor in parallel with 100uf capacitor to smooth the ripples in the sine wave.
1n5819 may not able to handle 80volt...90volt spikes since it's design up to 40volts.
maybe UF4004 would fare better.
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I wonder if the insulating mica sheet would convert radiation into electrical pulses which produce ou."Just theory"

There are no 80-90 volt spikes. Akula's scopeshot is showing you the result of having your scope and probe attenuations misset.
He is using 1x atten on the probe and has the scope thinking it's at 10x. The actual vertical resolution on Akula's screenshot is 5v/div, not 50v/div and his cited 80 v p-p is actually only around 8 v p-p... just like mine.

ETA: I just tried a couple different 100 nF caps, one poly film and one ceramic, across the 100 uF capacitor. No effect that I can detect.

[MenofFather]

If speake about 3v OU Flashlight, then that is capasitor, 510 nanofarads or 510 picofards?

[TinselKoala]

So let me get this straight. I am using Akula's circuit with only two substitutions: A TIP3055 that switches, instead of a mosfet that doesn't switch, and a 100R resistor in series with the two LEDs on the cathode end to ground.
I've corrected the seeming errors in the inductances stated on the original schematic and I've found that the inductances were likely reversed in the original schematic somehow. After much effort tuning and fiddling and substituting, winding several different coils and exploring the problem space nearly full time over the last three or four days... and I have actually reproduced, as far as I can tell, the exact waveforms that Akula is exhibiting. Frequency, amplitude, envelope, harmonics, noise... it is all there. I am less than 5 percent off in any direction.

Yet many of you are telling me I need some other ferrite material.  Even though I have the exact same waveforms.

PLEASE EXPLAIN in actual terms that have meaning, with references to checkable credible sources, how this can possibly be.

It certainly seems to me that if I had different material that resonated at a different frequency I would not have these waveforms using these component values. Anyone care to challenge this, perhaps with _a demonstration of your own_?

[TinselKoala]

If speake about 3v OU Flashlight, then that is capasitor, 510 nanofarads or 510 picofards?

I have 510 picoFarads.

Current schematic:

[lost_bro]

This is one of the standard ways of determining resonance in a coil/core. What part is the "ferro" part and what part is just ordinary electrical LCR resonance?

Good afternoon TK.

Hope this is helpful,,,, lots of info.....

take care, peace
lost_bro