Dr Ronald Stiffler SEC technology

[itsu]

Just guessing,
From what is shown on the scope the diodes remain in conduction. I am not certain but I don't see the presence of any 4-6 nS delay from junction turn off.
Interestingly in the case of  L3 placement concentric to the loop there does appear to be lead lag as shown. The dynamics of the loop might be a circular wave guide
and the frequency drop might be the total reverse diode junction capacitance. Simlar to tuning miniature magnetic transmitting loop. Which makes me think that
a varicap or varactor insertion might show more effect on the frequency and some advantage possibly more interaction with the outer lattice having the original frequency.

Tnx, Joe

Thanks uV,

indeed, no sign of the 4-6ns delay from each diode junction turn off.

I got an interesting comment on my YT video about the 25ns delay being the half time of the freqeuncy
used (@ 20MHz, 1 full periode or wave = 50ns).

At the input of the L3 coil at resonance, i have shown that we have voltage and current in phase,
so it seems that behind (output?) this L3 coil the current is 25ns delayed or 180° out of phase compared to the input.

This could mean that the L3 coil causes this 180° current shift as it is a ½ wavelength long (i would have
expected it to be ¼ wavelength).

So again, this could mean that the L3 coil is introducing (injecting) the current into the diode ring
at both sides of the L3 coil (with this 180° phase difference).

Need to find a way to show the wavelength across the L3 coil.......


Itsu

[gyulasun]

Hi Itsu,

Would it make sense to check the voltage waveform across some of the diodes, I wonder.  Using the two scope probes in differential mode they may not disturb the operation of the loop too much.

As a variation, perhaps it would not disturb the loop too much either if you monitor the current waveform with the current probe at say near the LED + input, let's consider it as a reference,  and see the voltage waveform across a diode at a time with the two probes in differential mode, moving the two probes from diode to diode.

IF these measurements would "detune" the diode loop the moment the two voltage probes tip are touching the two legs of a diode, then try to readjust the frequency, perhaps this does not fool us much...  Of course if such detuning happens at say 7 diodes later as you move the tips, then do not retune the frequency because it would be a different situation phase wise.

One more observation: You guided through the diode loop wire inside the coil L3. You did this because this was the best arrangement for probing the delay I suppose? If you do not lead the diode loop wire inside L3 but guide it outside of it, question is how the delay measurement would change alongside the loop?  Would this be worth checking?

Gyula

[itsu]

Gyula,

ok,  i tried to follow your suggestion, but have difficulty in that the differential signals are very noisy.
I trigger on the current probe signal at the plus led entry which is reasonable stable, but then the both
differential signals are showing multiple signals (thick / wavy) see screenshot.
Green is current probe at 1st diode, blue and purple are wavy differential signals across diode 1, red is math
trace blue - purple.

Going up from the first diode at the leds plus side from a minus value (-440mV) up to the diode just before
the L3 coil (7th diode) to a positive value (1.5V).
Remember i have 15 diodes in the ring, 7 before the L3 coil, 1 at the L3 coil (#8) and 7 behind the L3 coil.


Skipping the L3 coil so going over to the 9th diode kills almost the signal and is not retuneable, so
going on the the next (10th) diode shows a similar patern, but now reversed, so from positive 1.5V to
negative 400mV at the last diode (all 180° phase shifted).

Leading the diode ring through the L3 coil or above or below it does not make any difference concerning the
delay times measured.

I had both my video camera batteries drained somehow, so no video now.

Itsu

[Lidmotor]

New video from Dr. Stiffler:
https://www.youtube.com/watch?v=8VRqf8E8VIM&t=0s

Two Loops now, circuit diagrams,  and a discussion about current in the Loop.

----Lidmotor

PS---Notice that he built up the whole thing on a breadboard.  This is something that he normally never does.

[itsu]

video's of the measurements across the diodes from my above post untill the battery was drained:

https://www.youtube.com/watch?v=qwL60dg5_bc&feature=youtu.be


I have no idea where Dr. Stiffler is leading us to, so i will stop following along with replications for now.


Itsu