Dr Ronald Stiffler SEC technology

[itsu]

Thanks Gyula,

i will try a bigger variable cap and use a L3 coil (with leds) that resonates around 13.56MHz.

Question about the 100nF cap, i thought it will be included in the L3 / leds series resonance (pulling it down greatly), but it seems to have little influence.
Does this mean that there is no series resonance in play (L3 via capacitance to the leds)?

Anyway, here the diagram as i now have it running.

Itsu

[gyulasun]

The 100 nF can influence resonance at 13.56 MHz only very very little, it is practically an AC short circuit.
I will think on the mutual influence between the tank and L3, both are a parallel resonant circuit connected in
series via the stray caps or fields.     Gyula

[mikrovolt]

Working with the crystal or low output SG
https://electronicbase.net/band-pass-filter-calculator/#lc-bandpass-filter-calculator

[gyulasun]

Hi mikrovolt,
Please resize your uploaded picture because it is too wide horizontally, and makes the thread hard to read.
Resize it in Windows Paint or in any picture editor and make sure the horizontal pixel number is not higher
than 900, ok?  (Now it has 1079.)You can edit your post and reupload the reduced size picture if you click on the
Modify icon at the top right sideof your above post,  just scroll horizontally to the right hand size to be able to see it. 
Please do this within 12 hours, later you cannot do this.  Forum software sucks us all...

Thanks,   
Gyula

[Lidmotor]

Gyula and Conrad ----Thanks for the feedback on that function generator I am using.  So I guess it gives out only about 1 watt.  Not much to play with but that is the whole point.  The crystal circuits we are building allow for increased power and the question is whether or not there is a gain.  It is an interesting study either way.

Mikrovolt-- I thought about a filter add on all last night.  Dr. Stiffler usually had one in his circuits.  I have always been sloppy in my work and left them off but in this study there might be a real need for one.  If there is a true gain then fine tuning might the difference in seeing it or not.  Just guessing.

--Lidmotor