Dr Ronald Stiffler SEC technology

[Slider2732]

Gyula - have just had a look at those schems again and will study them more.
There is a possibly simplified method for the sinewave and, as luck would have it, the thinking was verified this morning in a roundabout way.
Julian Illett uploaded a video of building a 1kHz sinewave circuit kit. Onboard, was a filament bulb !
The Bedini SSG used to make use of an 'ear of wheat' bulb and yesterday I found a 1970's era front panel for some kind of CB gear, with half a dozen of those bulbs on it. Looks like they were pre-LED used for the same illuminations.
The idea now being, to get the oscillator signal amplified by any means and then have the bulb in series with a likely MOSFET at the output.
That raises questions about interference, but it's worthwhile to experiment with due to the method.

It looks like i'll continue on with the 2 pin oscillator circuit until the AD9850 arrives....other signal sources are either spendy to replace or not locked in as well as the crystals. I can blow this up and it would take about 20 minutes to make another.

Oh, and, with a 4.5MHz crystal and an L3 on the output, if I move a hand over the coil the signal jumps to 13.3MHz !
It suddenly just flips upward to 3x what it should be. A very handy flip to a possibly more usable frequency.

[NickZ]

   There are plenty of 13MHz simple oscillator circuits on the internet. You might find some that would suit your needs. I pull one out of a TV motherboard, might be the right frequency.  Not sure about that yet,  but it looks the same as the ones pictured on the internet.

[gyulasun]

...
Oh, and, with a 4.5MHz crystal and an L3 on the output, if I move a hand over the coil the signal jumps to 13.3MHz !
It suddenly just flips upward to 3x what it should be. A very handy flip to a possibly more usable frequency.

Hi Slider,

Crystals in general are willing to oscillate at their odd harmonic numbers so your 4.5 MHz crystal will do so at 3 x 4.5 = 13.5 MHz.

[There are so called overtone crystals manufactured specifically for oscillating at an overtone mode (at an odd harmonic) of a base frequency and one need to insure a tuned circuit (in most cases) to force this oscillation mode to happen. ]

See this circuit from the same link you already gave:
http://jaunty-electronics.com/blog/2012/08/overtone-crystal-oscillator/  just remove the collector resistor and put an LC circuit there instead. Use not higher than 1 uH coil, it needs roughly a 140 pF tuning capacitor.

If you attempt to drive the gate of a MOSFET from the collector via a coupling cap, then the input C_GS (being in the order of some nF) of the MOSFET will detune the tank significantly unless you compensate for this input cap properly by a matching network, or simply use a buffer amplifier to separate the collector from the gate.

Gyula

[gyulasun]

Hi Nick,
Is the frequency of the crystal you pulled out from the TV  written on the metal case? 
For NTSC colour tv types usually 3.58 MHz, for PAL systems 4.43 MHz is used but you may find crystals for different frequencies of course if you pull out the ones used for clocking the microprocessor.

Gyula

[Lidmotor]

I was able to reproduce the signal that Dr. Stiffler used but not at the needed higher voltage  I just used that 13MHz crystal oscillator that I have.  I got it to light up a few leds but it will not light up a large array.  The voltage was not enough.  Perhaps there is a way to amplify this signal using a secondary circuit.  It seems to me all you would have to do is run this signal through a cap into the base of a transistor (like a 2N3055), apply the other needed components, and Bob's your uncle.  We only need 24volts and less than 200mA.
  Here is the video of the messy setup:  https://www.youtube.com/watch?v=3pMk19OzF6A

--Lidmotor