Dr Ronald Stiffler SEC technology

[gyulasun]

Hi Nick,

The choke coil labeled as 221 is certainly a 220 uH coil, see explanation why here:
https://electronics.stackexchange.com/questions/23837/values-of-inductance-what-is-the-base-value

No problem that it is not a 1000 uH. A 220 uH coil has an inductive reactance of XL=10 kOhm (already more than enough) at 7.25 MHz frequency and you can learn about other values for other crystal frequencies you happen to have here:
http://www.66pacific.com/calculators/inductive-reactance-calculator.aspx

For a trimmer pot, try to use at least a 470 kOhm or even higher (1 MOHm) for the 8 or 12V tests. You can connect a series 100 k or even a 220 kOhm resistor with the trimmer pot. It would be good to check the input current to learn about its actual value as I already wrote. 

Thanks for the pictures. In the last picture it is surely the stray mains AC field that makes that very faint LED seen.

Gyula

[gyulasun]

Hi Itsu,

Okay on the input current measurements.  It is sure that the 50 mA is the reality when the crystal is in the circuit. Analog Ampermeters are a good choice for averaging and "smoothing" AC currents in most cases (not always though).

Regarding the measured 50 pF for the variable cap I believe you diconnected its 2 pins from the tank circuit to measure it with a C meter, right? 
Thinking further on this, if the 50 pF tuning cap was needed to get resonance for the tank, then a certain saturation should have happened because as I wrote a 2.76 uH coil is needed to give resonance at 13.56 MHz with 50 pF. It is ok that the 22 pF and the probe's 8 pF was across the collector and emitter but these latter values were 'seeing' the 4 turn cap and not the full 18 turns so their effect must have been minimal. If the probe's 8 pF was across the tank and not across the collector-emitter, than we deduce 8 pF from the 50 pF, we still have 40-42 pF tuning cap for the tank and this is still 10 pF higher than what would be needed for a 4.4 uH coil. So saturaion is in suspect and perhaps a tap at 3 or 2 turns may help on this.  Any time next week if you feel like checking this would be appreciated.
Thanks,  Gyula

[NickZ]

   Ok, thanks again.   I looked at the inductor chart, and saw the 221 choke as a 220uH inductor. So, that part should be ok.
   It seams strange that the red led (last pic) lights with no stray AC. As the oscillator is isolated, and there is no earth ground connection, nor any AC current lines or anything from the AC being used. Yet it lights a bit. But, I'll turn off my breakers, just to be sure that that is what is causing it to light. You never know...

    My set up seams to like the 3.5Mhz, and 7,2MHz better than the 13.5Mhz crystal. I have already shortened the L3. I have seen how the Doc has several different sizes of L3, also.
   Perhaps the "effect" can happen as well, with other value crystals, not just with the 13.5Mhz.
   After viewing Lidmotor's video, where he is using his crystal oscillator running off of a 9v battery, I can see that I need to work on the wireless aspect of this project. As yet, I'm not seeing any wireless effects, or maybe just a tiny bit, and I'm not sure why.

   So according to the data provided by Itsu, would you think that he may be getting closer to OU? Or still has a ways to go.

[itsu]

Thanks Gyula,

i measured again the variable cap after it was in resonance by desoldering the 2 leads and using my LCR meter, it reads 47pF.
The toroid coil measured the same way measures 4.33uH.

I will play with the taps later today / tomorrow.




Nick,

not sure why you think there would be any OU in play here, i personally do not expect any.

Itsu

[erfandl]

erfandl---The inductor is 1000uh and a 3300uh.  I got the 3300uh (3.3 milihenry?) off the circuit board that came out of a 50w OptoLight led bulb.  The little transformer looking thing on the board (that is really just an inductor) also worked.  I can't remember what the value was. 
  I hope you try that 3 choke Exciter circuit that Slayer came up and put your spin on it to light up these 110v led lightbulb arrays.  What is happening in that circuit carries over to what we have been doing here---make light with as little power as possible.

Cheers---Lidmotor

Hi lidmotor. thanks for reply. I build the 3 choke exciter but the performance of circuit output is poor. the cap is 22 pf. I tested with 30pf trimmer but not any change. inductors is 1mh. power source is 3.7 volt battery. the circuit starting oscillate only with my hand.