KA4EP Torch (kacher torch)

[d3x0r]

And so I am trying ; have come a long way from 100mA to 15mA with more output (earlier things not really documented because it was obviously poor in efficiency)
mc34063; was a lower power version...


cannot find video/backtrace of фонарь 30W(Lantern 30W) above.


https://www.youtube.com/watch?v=YleTYEVZaxs (fail)
https://www.youtube.com/watch?v=4C4vzlW0Oxw (fail)
https://www.youtube.com/watch?v=1_iutxqAz_M(success?)


https://www.youtube.com/watch?v=EwCS15pRtH0 (analysis)


Schematic has a reversed diode...
The other 30W videos that would be from akula are the dual tl494 version...  Hmm maybe he's only using one side of it...
https://www.youtube.com/watch?v=sK_23dpv-Zg


But anyway I see no akula vids that resemble the large heatsink with fan.
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My issue would be, that scheme has no return-to-ground path.... Except the single foil winding... which is OK since a open resonsant system can transfer power, it must be that the magnetic field is the electron allowed to reform on the secondary.  (although I guess by this time I ended up using a ground for better output https://www.youtube.com/watch?v=J7ymt5HrgVU  for some output it wasn't required; guess I should redo those experiments)

[d3x0r]

Modified original schematic, can capture power on the positive side also; reduces current draw.  (shortens original spike) reduces secondary kickback.
reduces power generated on negative side; ends up balancing it.

[MarkE]

I would be inclined to return the LEDs on the left to the low side of the battery instead of the high side.  It shouldn't make a difference power wise, but would likely make the circuit a bit quieter.

[d3x0r]

I would be inclined to return the LEDs on the left to the low side of the battery instead of the high side.  It shouldn't make a difference power wise, but would likely make the circuit a bit quieter.

That's the second one that's commented about noisy circuit.  There's no noise; well, no more noise than is present in a peice of wire attached to a scope probe set to high sensitivity.  Most likely the cause of noise is that I have a clip-lead extension from the scope probe to the circuit; just because it's more flexible and easier to reattach to various points.
The return to power increase positive potential and allows recirculation of power; which slighly decreases power draw from the source.

[d3x0r]

I grabbed a couple 555 timer chips, and configured them for a short duty cycle variable frequency...
a very short duty cycle draws a lot of power (ends up using a low resistance on the charge side); will probably add a hex-inverter in after the drive, and use a large duty cycle instead... and I expect the issue to remain after this change.
When the duty cycle is long enough to (close) the transistor and get a good current through the coil, at the shutoff side, there is a HUGE amount of noise introduced.  I added the resistor & capacitor in series with another capacitor to ground (supposedly adjustable, but I'm just breadboarding so it's all adjustable)  like in akula lantern 4... (attached)
is it the transistor I've used that makes this unavoidable?  Is there a way to make it less noisy?
I added a diode between the inductor (to collector of transistor) because apparently the transistor used by akula must have such a character, because the feedback is progressively lower, and with every transistor I have if the collector is lower than the base, then it conducts... that's how I meter them to see they are still good... so there must be a internal blocking diode for the signal to remain.... or an omitted part...


but anyway; about the noise?