Dr Ronald Stiffler SEC technology

[Slider2732]

Lidmotor - classic line of the day, in a good way:

The magic comes out of the woodwork

That's a very neat change to the circuit, having the 1000uH instead of a resistor.
I have a 13.5225 2 pin and it's as dead as an Icelandic rhinoceros for wireless output.
So, without an inductance meter I need to wind an exact Dr. Stiffler L3. Then presumably take a turn off, add a turn, until all the magic springs forth.


TK -  Your drive though should still be fine for switching an amplifier stage ?
It's good to know which ones are indeed speedy enough. Most of my chips are 1980's, so am missing more modern variants.

[TinselKoala]

Lidmotor - classic line of the day, in a good way:That's a very neat change to the circuit, having the 1000uH instead of a resistor.
I have a 13.5225 2 pin and it's as dead as an Icelandic rhinoceros for wireless output.
So, without an inductance meter I need to wind an exact Dr. Stiffler L3. Then presumably take a turn off, add a turn, until all the magic springs forth.


TK -  Your drive though should still be fine for switching an amplifier stage ?
It's good to know which ones are indeed speedy enough. Most of my chips are 1980's, so am missing more modern variants.

Yes, I think I'll try to drive a highspeed mosfet driver with it. If that works out, then I'll arrange a higher voltage supply for a mosfet as the final output stage.

[TinselKoala]

All--- I tried that simple crystal oscillator circuit out with a 13.56 MHz crystal and it was pretty spectacular.  I ran it on a 9v battery and changed the 1K feed resistor to a 1000uH choke.  Here is the video of it:

https://www.youtube.com/watch?v=PqsVQPLXi3E

--Lidmotor

That's pretty spectacular all right.

I can't run mine at 9v because of the 74ac04 output buffer. But at 3 volts and 6.5 mA I can at least light up one little LED with the single wire from a random spool-end "coil" of wire.

And when I short out the AV plug diodes the LED goes out of course and the current drain goes down to 5.1 mA. Does this mean lighting the LED only takes 1.4 mA?

[Slider2732]

Well there must be some power used by the circuit and one might think the crystal would use some...so try taking the crystal out.

That's what I did, along with changing the 1K resistor to a 1000uH axial inductor, following Lidmotor's lead.

Ladies and gents, we have a new Exciter circuit.
https://www.youtube.com/watch?v=QE4uvw1JBb0

[mikrovolt]

The crystal frequency is divided by 2. This gives is the resonance for L1.
The SEC 18 board comes with a chart for about a hundred of these series.
When the board is working correctly it is in the negative resistance oscillator mode.
there are three diodes that protects the transistor from being destroyed.
Now that the board is running switch off the crystal and use the spectrum analyzer
for final adjustment if any then the whole series is shown. They will agree with
Doctor Stiffler's video showing SA with all the harmonics. It is classed
as an ultra wide band capable of 500 Mhz. One demonstration shows large battery
being charged, the unit was drawing 200 micro amps.

The crystal oscillators can output to a remote location using an old TV coax.
Remember the 7490 can do different divisions. Most of these transformer applications apply to
center tap transformers sometime we use 2 l3 coils but also useful on slayers.
https://wiki.analog.com/university/courses/electronics/text/chapter-6
The crystal generator allows the frequency generator to be free to use as the need arises.