Akula eternal lantern 4

[Void]

Hi Void,  please tell us how you did it,
Regards Itsu

Hi Itsu. All I did was adjust the pulse width, like Akula showed in his video.
However, as I described in my previous comment above, my scope is also doing
some strange things when switching between 2V/div and 5V/div, so I am not sure
if I can rely on the waveforms I am currently seeing on my scope. Maybe someone has an explanation
for the weirdness I am seeing with my scope when switching between 2V/div and 5V/div?
I need to do more investigation into this to try to understand better what is going on, but Akula's
scope also apparently showed the same quirk.

As far as how things have to be adjusted, I suspect it may well depend a lot on the exact core you are testing with.
A lot more experimenting is likely needed.

I discovered that my regulated power supply seems to run OK when using higher pulse frequencies,
but at lower pulse frequencies the regulator on my power supply can't handle it and starts acting
very erratically.  I need to find a different power supply for testing with so I can test at
lower pulse frequencies.

All the best...

[itsu]

Hi Itsu. All I did was adjust the pulse width, like Akula showed in his video.
However, as I described in my previous comment above, my scope is also doing
some strange things when switching between 2V/div and 5V/div, so I am not sure
if I can rely on the waveforms I am currently seeing on my scope. Maybe someone has an explanation
for the weirdness I am seeing with my scope when switching between 2V/div and 5V/div?
I need to do more investigation into this to try to understand better what is going on, but Akula's
scope also apparently showed the same quirk.

As far as how things have to be adjusted, I suspect it may well depend a lot on the exact core you are testing with.
A lot more experimenting is likely needed.

I discovered that my regulated power supply seems to run OK when using higher pulse frequencies,
but at lower pulse frequencies the regulator on my power supply can't handle it and starts acting
very erratically.  I need to find a different power supply for testing with so I can test at
lower pulse frequencies.

All the best...

Thanks void,

but what kind of adjustments did you make,  like from 4% duty cycle to 2%?   Or do you vary the pulse width by some other means?

I have no idea why your scope would display strange things when switching between 2 and 5V/div.
I have not seen that here, and it does not make sense, unless there is the same influence as with your bench PS on your
scopes vertical amplifier

I have seen acting my bench PS weird also on other experiments, not here though.
Perhaps you can use a battery (12V) with some voltage regulators (5V or even 3V).

Are you able to replicate the pulse i see with the settings i use?


Thanks,  regards itsu

[itsu]

I did some additional tests as mentioned by others above, like changing the coil/core for an air coil.
It also has this peak allthough its on another position (45us), so it has nothing to do with the ferrite.

The smaller core also shows this too also again on another position.

So void, please try to find out what is happening with your setup that makes your PS / scope go strange.
Do you have any details on what you are using like coils/core/transistor etc.?

Thanks,  regards itsu

[Void]

Hello Itsu. The adjustments I made to the pulse width were just to increase it slowly
until I saw the exponentially rising waveforms on the Drain. However as you will see in the
two attached scope shots, this really does appear to be some quirk with my scope such that
I only see the curved waveforms on the Drain when I have the scope set to 2V/div or less, and the
Drain waveform looks normal with a flat top when set to 5V/div or higher. As D3xOr suggested, it may
be due to some difference in capacitance or input impedance in the scope when I switch between
2V/div and 5V/div, and this particular setup seems to be very sensitive to this. I really don't know
for certain why this is happening however. See the attached waveforms to see how the waveform
appearance changes when set on 2V/div or 5V/div.
Blue is the Drain.
Yellow is the Gate.

[hartiberlin]

I had the same problems years ago with my analog Hameg scope HM 312 when I researched the Newman machine pulses and back current spikes from the back EMF...
In the lower volts/div settings I always had bigger spikes and flanks than in the higher volts/div scale...
But it also happened on another scope , so I am not sure , what it exactly is... Maybe a different bandwidth of the input amplifier or changing the input impedance or something like that ?

Would be good to find out the cause of it. I used a 100x scopehead...