RESONANCE EFFECTS FOR EVERYONE TO SHARE

[najman100]

What is this the smoking finger gang?
I hope this isn't some kind of initiation!!
GEESH the flaming digits
Chet

yes  you might be asked for that 

[gotoluc]

Hi everyone,

I remembered that I still can continue testing using the 10 volts RMS output of my Signal Generator. It's nothing like having 50 volts but good enough to see the effects of resonance and test new coil designs.

I'm trying to better understand what is going on in the Secondary pickup coil. It looks like it works more like an antenna since I was able to have it 3/4" or 20mm away (see picture) and it still can charge the capacitor to 1.12vdc with a 5 ohm load attached to it and I was using only 7.19 volts RMS from the SG output. Also prior to doing this test I tuned the primary coil without a secondary on it to resonate at a frequency where it would use the less amp draw by using the small micro 12v (12 ohm) car dash bulb in series and tuned it to the point that the bulbs filament would not even glow. I was down to a 120pf capacitor in series and at 625Khz square wave. I attached my Scope probes, green to the SG at the primary input and the yellow to the loaded capacitor from the secondary (see Scope shot) My USB Scope also has an FFT so  attached the FFT of the secondary probe.

Interesting to see the secondary is resonating at its own frequency? Looks like for every punch from the primary the secondary keeps resonating. Maybe this is where the extra energy is coming from???

Anyone care to comment.

Luc

[najman100]

Hello Luc
i suggest that you do not use your signal generator like that you might burn it ,looking at the scope shot i see the square is distorted maybe because of the BEMF  comming back to the signal generator so the same thing gonna happen to the  SG  as it hapened to the 2103.

Najman100

[CRANKYpants]

Hi everyone,

Interesting to see the secondary is resonating at its own frequency? Looks like for every punch from the primary the secondary keeps resonating. Maybe this is where the extra energy is coming from???

Anyone care to comment.

Luc

Sai Ram Luc,

My secret Christmas wish to the Universe was that I could be able to fully finance your important work...

Because for anyone to comment correctly you really need to give everyone a full "3D" picture of what is going on or we end up like the "4 blind men trying to describing the elephant"

If you are using AC - you really ought to be monitoring the current, voltage and most importantly POWER FACTOR at ALL times.
(perhaps you should come and borrow a scope that can do that for you?)

This will tell you and all of us what is really going on in all the coils at all times.

Cheers
Thane

[gotoluc]

Hello Luc
i suggest that you do not use your signal generator like that you might burn it ,looking at the scope shot i see the square is distorted maybe because of the BEMF  comming back to the signal generator so the same thing gonna happen to the  SG  as it hapened to the 2103.

Najman100

Thanks Najman for your concern and comment ... you do have a good point and I could blow my eBay $22. SG but I'm prepared to make that sacrifice just to continue studying the effect... I'm hooked ... I need to resonate things man

If anyone has any suggestion on a way I can protect my SG please share.

I'll try and see if a ferrite Isolation transformer works

Thanks for sharing

Luc