Interesting Oscillator

[porkluvr]

I gave some incorrect information.

The syntax for an initial conditions statement needs parentheses around the circuit element, like so:

.ic i(Ltx)=5e-6 or .ic i(Ltx)=5u


Of course if your inductor is named L1 you would use L1 in parentheses instead of Ltx.

[golfnut]

Porkluvr , you at home - Ur up early .

Steve UK

[MAURICE]

Hi Steve.
Here is how I view harmonic content. Run simulation,click probe ( voltage ) on output as normal when waveform is present, right click on it a caret will open at the bottom select view > fft. This will show you your output spectrum (at the bottom of page you can see freqency by moving cursor to tip of main signal. To measure place cursor at tip hold right mouse down and move downward till next lower peak. At the bottom of screen will be displayed the difference in db. The LT spice Guru's are probably laughing by now. But I hope this has helped.
Regards Maurice.

[turtlebowl]

Can someone post Maurices latest in a usable format please?
Maurice,,,is this still at 14.5kHZ ? Thanks again.

[MAURICE]

Hi Steve
I have just run your simulation with adjusted values. Nice output and harmonic spectrum also. I measure about -28 db down. Porkluvr I am aware that the oscillator has same topology as IGSL , but the subtle changes make a difference inst that what spice is all about. Anyway I think we can put this one to bed now. I would like to use this circuit in my next IGSL. I am presently busy with board layed out by Nakky ,as well as making up coil former and vacuum table so very busy. Thanks to you Steve and Porkulvr for your assistance.
Regards Maurice.

[MAURICE]

Hi Turtlebowl.
With 1.2mH inductor ( COIL) and resonating cap of 100nF oscillator will run at +- 14.7 kHz. But one can play with LC ratios as you desire that's the beauty of spice. These are just guidelines because in practice it may be difficult to get to an exact freqency. I wish you luck with LT SPICE if you try it. I am also just a beginner in LT spice but have competent friend to assist me when I get stuck. LT spice can be very complex but even learning the basics can be very rewarding.
Regards Maurice. PS Steve's simulation looks great.

[turtlebowl]

Thanks Maurice. I , like all of us here, have way to many pies to eat! And never enough time.
Learning The Spice program is just another example, especially when you know going in that if you begin olderprojects will fall by the wayside. Things like learning Spice is exactly why our worktables look the way they do...LOL. Crap everywhere and nothing completed.
Funny.
I would love to learn the program, and will eventually, as it seems like a good investment in time but I currently have no less than 6-7 projects going.
Your post caught my eye becuase the osc in Whites is nearly the same as the Compass osc. I just happen to be studying Compass circuits at this time as well as 15khz GMTs. So this was a perfect fit.
Anyways thanks man for the posts and if someone could post the values (or Jpg drawing) of your latest 150mA TX @ 14.7khz before this thread gets wrapped that would be great!
I also like JPGs becuase I can use MS Paint to add notes as to Auther, Website, versions, etc.
Best New Year ever,,,,
Phil M

[golfnut]

Turtle bowl Lt spice is within reach for everybdy who can read. I dont like learning codes cyphers etc that you will not use.


LT spice is an exception to these rules. If you double click one of our files on here spice will open it.
Click simulate and its all over.

It takes longer to boot the pc than to knock a model up and get th info U mwy need.

Pencil sketch what u want running and we can put results in a reply
Steve

[turtlebowl]

Steve,, thanks for the reply. OK so what your saying is that I do not have to learn the program to simply view a schematic with the spice program. Cool. I didn't know that. I will give it a shot.
I travel alot and operate from a small notebook and just don't like having extra seldom used programs on my limited resource.
Thanks,
PM

[golfnut]

Hi Maurice try this puppy its a real bruiser!

I got the existing IGSL osc to fire into a complmentary mosfet pair feeding a resonant cct.

1A pk to pk.

Madness.

S

[DOOLEY]

golfnut , you crazy , but i like it !!!

next thing , vlf's with a 12v lead gell stapped to your belt and a health warning.

[golfnut]

I use remote battery in pocket,,,, 3 cells cut from a dead laptop battey - 0 pence solution, 1.8AH 12v

The beast oscillator would run for 4 hours on this type of scrap battery. ~350mA RMS say 450 with losses. 1800/450 = 4Hrs Ive normally had enough after two !

Charge is by the 3way and gnd plug (20pence - from Giant Cod)
Mini charger too from Giant Cod £5

Steve

[MAURICE]

Hi Steve,
Thanks for the simulation a really powerful oscillator.
Regarding my original posting I was hoping to find a more universal oscillator which would work with coils over the range of 1mH to 6mH. However we have found this oscillator tends to favor 1mH coils. Just to put others mind at ease I have re-run simulation of TGSLMC oscillator and found it very good with 300mA PEAK-PEAK current through coil, no wonder Ivonic has better performance with 1mH COILS.
Best Regards
Maurice.

[MAURICE]

Hi
Slip of the finger. I meant IGSL-MC.
Regards
Maurice

[6666]

Mr Pork said

Even the Paint program that comes with windows will let you paste the screen shot and save, but unfortunately you can't crop with it.

its called the "select" tool