Dr Ronald Stiffler SEC technology

[gyulasun]

Hi Lidmotor,

In your video you showed yesterday on water electrolysis you said the MPSA06 transistor
(or a 2N2222) in the 13.56 MHz crystal  oscillator circuit is stone cold and that is not normal.
And normally these transistors in the Doc's SEC circuits get warm and need the use of a heat sink,
while in a Slayer exciter the transistor would be even blown without a heat sink.
The reason I write is that there is explanation why the transistors in the crystal oscillator circuit
you use cannot get warm and there is no any extraordinary (or magic) in that.
Data sheet https://www.onsemi.com/pub/Collateral/MPSA05-D.PDF for the MPSA06 says the
DC current gain (h_FE) is a minimum of 100, typically 150 to 200. The 100 kOhm base resistor from the 12V battery
biases the base-emitter diode with roughly I=12V/100kOhm= 0.12 mA (a simplified calculation).
This base current would establish a maximum of 200 times 0.12 mA = 24 mA DC collector current if your transistor
had indeed a h_FE of 200.
For any h_FE lower than 200 the collector current would be proportionally less, for a h_FE=100 the collector
current would be only 12 mADC. From the AC collector current point of view, there is the 1 mH choke coil in
the collector which limits the 13.56 MHz current. The inductive reactance of 1 mH at 13.56 MHz is around
85 kOhm so the AC components of the collector current does not influence the DC collector current too much,
the heat dissipation is governed mainly by the value of DC bias resistor (100 kOhm) and the individual transistors
h_FE values.
These all mean the transistor is not driven hard at all, total DC input power is roughly 12V*24mA = 288 mW
in the worst case if h_FE is around 200 for your transistor.

For a SEC circuit the coil in the collector has but a few uH inductance which cannot limit AC collector current
significantly and there is the series LC circuit between the base-emitter which mainly control the base hence
the collector current AC wise, and there are many harmonics besides the main oscillating frequency.
These mean the collector current may swing up to the 100-200 mA range and with a 18V supply voltage
this can already cause much higher dissipation for the transistor, calling for heat sink.

In the Slayer oscillator the few turn primary also represents a relatively low value collector impedance, this cannot
reduce AC collector current significantly so high peak currents may flow during the oscillations. Confront this with
SkyWatcher's recent Slayer exciter circuit where he used 80 turns for the primary coil instead of the few turns,
so the collector impedance must have been much higher than for the few turns case, not letting peak currents go skyhigh.

Gyula

[NickZ]

   Gyula:   I tried to make an L3 coil, similar to what the Doc is using. But, it won't oscillate. It may have a few less turns than his, so I'll add as some more turns today, to see if it will kick on. I'm still using my previously shown Tesla coil, and Kacher circuit.
   
   Here is an interesting video about the filament led bulbs. Some can produce 1000 lumins, at a very low input. 
https://youtu.be/UD0-K2ZS0yY?t=76
       We still need to work out, if these tests can provide for OU, or can be looped, or not. Because, if not, we are all just pissing into the wind. And if it's just saving us few mAs, that by itself is not very exciting.   I have been asking myself, does the Stiffler loop actually do anything. And is any gain therefrom worth the effort.
   On his last video, he needs to show what happens when the diode loop is replaced with just a simple clip lead.
I'll bet it works the same, as with the diode loop. As it's just providing a ground return path, to help close the circuit.   Or not?   
    Dr. Stifler's latest video.
   https://youtu.be/r2d9-44TIlg   He mentions more to come. Well, I would hope so.
   

[Lidmotor]

Gyula --- Thanks for the engineering analysis of what is going on in this crystal circuit exciter that I am working with.  There is one mistake in your calculations though and it is probably my fault for not being clear about things.  I replaced the 1K resistor with a 1000uH choke that has only 4 ohms resistance.  That is why I thought the transistor should get hot.  I have worked with these exciter circuits for years in a 'tinkerer' way rather than an engineering way.  I just thought that things were a bit odd based on what I have observed in past experiments.  This is all probably totally normal and that is good news.  Learning how things work is a good thing.  Thanks for the help.

----Lidmotor

[mikrovolt]

I found an easy circuit uses a heavy bare copper wire. the coil has 16 turns on an 1.5 inch diameter
and 1.5 inch long. Those interested it is 6.9 uH tapped at 1/5 it is adjusted by stretching or
compressing slightly. a parallel tank is made with 6.9 uH and 82 pF.

As you would expect tapping at 1/5 simple oscillator is the hartley.

[Lidmotor]

All-- I found this site that shows a simple class E amplifier circuit including a calculator for determining component values.  The circuit reminds me of what I am working with now.  If you open end the load and use the capacitive link back ----it might run like an 'exciter'.  The driver would be a signal generator or maybe one of these crystal circuits we are using.

http://people.physics.anu.edu.au/~dxt103/calculators/class-e.php

--Lidmotor