3v OU Flashlight

[verpies]

I think one of Akula's traces might be inverted.
(My shot: Both channels at 2v/div, 5 ms/div horizontal. Bottom channel is inverted in scope.)

So I surmise that Itsu's scopeshots are different because none of his channels are inverted

[verpies]

As always, the core halves firmly forced together by electrical tape with a piece of paper in between the 2 outer legs of the e-core.

How does the LF sinus signal frequency respond to various tensions squeezing the core ?

[d3x0r]

How does the LF sinus signal frequency respond to various tensions squeezing the core ?

I think with the screw through a pot core, that it is very tightly compressed... maybe 20-50 inch-pounds




don't go chasing waterfalls?
Kinda wish there was just a thumbs up button (for magpwr's post)
might be fun to strip the black backgrounds to alpha and overlay things
(not for me just sayin)

[TinselKoala]

hi Tinselkoala and itsu,

There is one small noticable difference between Akula's version and Tinselkoala along with itsu.
I have attached the edited scope shot to show where i spotted something like "resonance within resonance" at these area.Upon observing carefully i can't help noticing for Akula there is much more of resonance within resonance base on scope shot provided from him.
I only spotted the difference only after itsu provided his latest scope shot which i compared against Tinselkoala's base on my memory then compared against Akula version.
Got to rush off bye for now.....

I think that happens when the supply voltage isn't adequate for the 34063. Instead of dropping all the way to the baseline, the bottom of the chip's pulse oscillations only follows that sinus shape. If you increase the supply voltage a tiny bit, or even change the setpoint pot, the chip will switch fully and the embedded sinus within the pulse "boxes" or bursts goes away. The parts between the pulses will still be there.

[TinselKoala]

How does the LF sinus signal frequency respond to various tensions squeezing the core ?

The tighter you have the core squeezed, the lower the frequency of the sinus. If you separate the core the frequency goes up and up until it drops out.
This of course is because this changing gap changes the inductance of the coils. It also must change the dimensional resonant characteristics of the core.
I think I illustrated this in one of the videos.
https://www.youtube.com/watch?v=kHAc7kDY4-w
around 4 minute mark. I think I got the directions right.