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Author Topic: Dr Ronald Stiffler SEC technology  (Read 278838 times)

gyulasun

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Re: Dr Ronald Stiffler SEC technology
« Reply #150 on: June 12, 2018, 12:41:53 AM »
Hi Nick,
In my reply  above  I also clearly noticed that Dr Stiffler said a no for the 27 MHz frequency.

I think that he very likely uses the 13.4-13.6 MHz range when he retunes his signal generator because the self resonance frequency of his air coil changes whenever the capacitive load on it also changes by any reason like due to the LEDs or when he uses an additional diode etc. 

I do not think that this narrow frequency range is strictly a must to observe because the CREE LED board needs such specific frequency where it behaves like he shows and it would not give as much brightness at say 11.9 MHz (random example) frequency. 

If someone has a signal generator i.e. a stabil frequency source, with the 20-25 Vpp output level, then a frequency sweep could be done on a similar LED board like the SMD CREE within say the 12-15 MHz range and then gradually widening the test range to see how the LEDs brightness behaves.  I do not rule out that his LED board may not work as good as it is seen in that narrow range when the frequency is changed to other frequencies that are say 1-2 MHz below or above that, of course. 
One could speculate that the CREE board has a specific size, arrangement that give a strange excitation for the LEDs only in that narrow range but I would be surprised if that would be the case. 

Notice that to do such frequency sweeps, one needs to have a variable inductance air core coil, known as a roller inductor so that the self resonant frequency of the coil could be matched to the changing generator frequency. See such roller inductor randomly chosen here for instance: http://www.freewebs.com/antreas555/MIKRO%20ROLLER%201.JPG 

An alternative solution to substitute this relatively expensive roller coil is to make several taps on a single layer solenoid coil of the needed size and place the connections always as the frequency dictates it.
 
I do believe though that his chosen narrow frequency range covers the 13.56 MHz industrial (also very narrow) band where one can use a limited power transmitter without license, quasi all over the world, this can surely be one explanation.   ;) This may even explain the no for the 27 MHz frequency too...  no need for causing unwanted interference.
So crystals can be purchased for 13.56 MHz, that is what I mainly mean here.

Gyula

NickZ

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Re: Dr Ronald Stiffler SEC technology
« Reply #151 on: June 12, 2018, 05:05:59 AM »
   Gyula:
   You are full of great ideas and information. And it may all add up.
   The industrial band, so no guys in white trucks... these little oscillator probably wouldn't reach out the door.

   I've just pulled out a couple of those types of crystal oscillators from old crt monitor, or Tv. The value is not readable.   Can they be tested, or are most of the ones that come on Tvs  13.5MHz, or so? They get rusted easily, and values can't be read.
    I think that we need to pin down the exact type and model of led bulb, at least that it has to have that metal backing.
    Looking on the internet for Cree 13w led bulbs for home use, gives me no results. There are some 13w ones for cars headlight or running light. Doc said they were 60w equivalent, I believe.  I find no such bulbs. There are 40, 60, 100w equivalent, but, no 13w leds that are 60w equivalent. So, I don't know which bulb he uses. But, I think that the main thing is, that it needs to have the metal backing, or it may not have the capacitive gain in output, to make up for all the losses.
And therefore, low efficiency, as far as seeing anything like OU.
   

Slider2732

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Re: Dr Ronald Stiffler SEC technology
« Reply #152 on: June 12, 2018, 06:03:18 AM »
Some fun replies :)
The 27MHz is only because I don't have others.
There is a PC card *somewhere* that has a bunch of the 4 legged on it, I just can't find it. It's circa 1993 and was kept specifically for those crystals. Happens all the time, throw stuff anywhere and it can be found, put something safe and it disappears !!!
There are many laptop and Pentium III/4 boards though and i'll look on those. Just recently I threw out loads of PII's, for no other reason than thinking I had enough crap around here  :-\
   
Will try the tank idea, it makes sense.

A very kind subscriber on Youtube has sent funds to buy an AD9850 that runs at up to 50MHz. Am also going to order a 1602 screen and perhaps other items to complete it. It means that the frequencies above, below and exacting to 13.6Mhz can be tried !
 

NickZ

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Re: Dr Ronald Stiffler SEC technology
« Reply #153 on: June 12, 2018, 06:22:08 AM »
   Sweet!!! I hope that you get it soon.

Slider2732

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Re: Dr Ronald Stiffler SEC technology
« Reply #154 on: June 12, 2018, 06:35:44 AM »
:) me too !

Just had a look at the crystal and it's a COMCLOK CT31AH
Am not finding info on it, but some quick tests with grounding and Vcc'ing have shown that the in series LED on Vcc brightens when an L3 is connected from the output to it. A 0.1uF cap, similarly connected as a tank, seems to make the scope read either 9MHz or 15MHz, flickering between the two. Am sure the loading is the thing because of the noted changes of waveform too.
Will try the 1K etc ideas of Gyula's from the previous page.
 

NickZ

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Re: Dr Ronald Stiffler SEC technology
« Reply #155 on: June 12, 2018, 06:59:33 AM »
:) me too !

Just had a look at the crystal and it's a COMCLOK CT31AH
Am not finding info on it, but some quick tests with grounding and Vcc'ing have shown that the in series LED on Vcc brightens when an L3 is connected from the output to it. A 0.1uF cap, similarly connected as a tank, seems to make the scope read either 9MHz or 15MHz, flickering between the two. Am sure the loading is the thing because of the noted changes of waveform too.
Will try the 1K etc ideas of Gyula's from the previous page.
   
   Slider:
  Your mentioned signal generator has an output of 1v p_p.  That may not be enough juice to capacitively fire the Leds. 
   So, what are you thinking of doing to obtain a 20 plus volt, 13.4MHz signal? 

Slider2732

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Re: Dr Ronald Stiffler SEC technology
« Reply #156 on: June 12, 2018, 07:31:16 AM »
Good question.
This DDS buffer amplifier is one route:
http://www.pongrance.com/dds-buffer.html
Changing some values will allow higher throughput.

Have just tried bunches of coils and bunches of caps on the 'illegal' 27MHz crystal.
The waveshape certainly changes, sometimes more rounded, sometimes better wireless 'range', but it is resolute in it's lack of wish to change from 9MHz.
47pF, 56pF, 30pF, 10pF, 0.1uF. Coils have been from a few aircore turns of 20AWG, to axial inductors. All do change the characteristics and waveshape, but nothing makes it budge in frequency. Even tried connecting from the output to Gnd and to Vcc with all the configurations and still no change. Just once or twice it would seem to flicker at 15MHz and then drop back to 9MHz again. That could easily have been the L3 coil interfering, which is connected to the output.
Does the output need a cap in series to decouple, 0.1uF, when the LC is in place ?

Btw, comical note.
I was just trying to verify if the AD9851 is really an upgrade to the AD9850 and saw this one advertised:
https://www.ebay.com/itm/DDS-Signal-Generator-Module-AD9851-2-Sine-Wave-2-Square-Wave-Replace-AD9850-GT/273146456861
Within the specs, was this gem of a line:
Quote
Clothes Asian size is usually 2 yards smaller than US/EU/UK, please compare carefully before ordering.

TinselKoala

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Re: Dr Ronald Stiffler SEC technology
« Reply #157 on: June 12, 2018, 07:33:18 AM »
The COMCLOK CT31AH is a 5v tri-state oscillator and comes in a variety of different frequencies. It should have the frequency stamped on it.

https://i.ebayimg.com/images/g/g0EAAOxyyjpRurq3/s-l1600.jpg
One pin is Vcc, one pin is ground, one pin is output, one pin is enable/disable.

Slider2732

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Re: Dr Ronald Stiffler SEC technology
« Reply #158 on: June 12, 2018, 07:40:16 AM »
That's it squire, exactly the same one :)

Tri-state, as in
1. Off
2. Thinking about switching on
3. 1/3rd On

TinselKoala

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Re: Dr Ronald Stiffler SEC technology
« Reply #159 on: June 12, 2018, 07:45:56 AM »
Another component that might be useful for this kind of thing is the Hitachi 1SS106 diode.

TinselKoala

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Re: Dr Ronald Stiffler SEC technology
« Reply #160 on: June 12, 2018, 07:50:00 AM »
This info may be useful:
Quote
If Tri-state pin is logic "1", then oscillator is connected to the output pin.  Same happens if Tri-state is left unconnected (there's probably an internal pull-up). 
If Tri-state pin is logic "0", then oscillator is not connected to the output pin, and output is floating.  The fact that it's floating may be useful if you need to switch between several clock sources.  You would enable one of them, and Tri-state the others to prevent contention between multiple outputs.

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NickZ

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Re: Dr Ronald Stiffler SEC technology
« Reply #161 on: June 12, 2018, 07:50:40 AM »
   But, what you really need is the 13.5MHz crystal. Right?
   I tried to post a link to that 13.5MHz crystal oscillator, from ebay, but was unable to do so.

Slider2732

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Re: Dr Ronald Stiffler SEC technology
« Reply #162 on: June 12, 2018, 07:55:13 AM »
Thanks TK, yes the bottom left pin is left disconnected.
I could force it High and see if anything changes, the internal pull-up could perhaps be weak. It's likely 30 years old, I have no new junk stuff.

Yep Nick, all this 27MHz stuff is only cos I personally have no others and I apologise for hogging the thread with it...however, it could be useful learning for correct MHz oscillators.

NickZ

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Re: Dr Ronald Stiffler SEC technology
« Reply #163 on: June 12, 2018, 08:04:39 AM »
   The mentioned buffer amplifier only goes to 5v, max.  If so, that's not enough amplitude to do the trick. And light the leds bulb using capacitance. I think.
    There must be a better solution, to obtain 20v to 25v output at 13.5MHz, or so. As the Doc uses. 

Slider2732

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Re: Dr Ronald Stiffler SEC technology
« Reply #164 on: June 12, 2018, 08:11:25 AM »
Hmm true, I was hoping to drive it at a higher voltage from a cheapo Chinese booster set to 20V. However, it would likely invoke impurities and mess it up.

Have just tried the Enable/Disable and it works as described. It didn't change the frequency at all though. I was hoping that cycling the pin might kick-start something.
Will look for more crystals in the morning.