Claimed OU circuit of Rosemary Ainslie

[MileHigh]

Aaron:

Sorry, but your posting about the spikes is misdirected.  When you remove the fly-back diode, then you get spikes, we always said that.  Your MOSFET switching is really good since you are getting such high voltages.

Your individual spikes are about 140 nSec wide and they appear to be happening every 4 uSec.  That's an equivalent duty cycle of 140/4000 = 3.5%.

Your oscillation frequency is about 250 KHz.  That's mighty fast!

On a 23uH coil, the oscillation spikes are about -440v and the normal pulse that precedes every oscillation burst has it's own spike at OVER -800v

That's what .99's PSpice simulation showed also.  Isn't that cool?  <Edit: Actually I should correct myself, he showed a ring-down which is not what you are showing.>

Watch out for aliasing effects between your 250 KHz pulse train and your 100 uSec time base.

MileHigh

[TinselKoala]

My goodness, high voltage spikes from an inductive discharge. What a discovery!

You know, I'll bet that if you optimized a circuit for spikes, and directed those spikes somewhere useful, like into the primary of a step-up transformer...and if the spikes actually had some useful energy (ie lasted a bit longer)...you might be able to get some interesting effects, and if voltage is what floats your boat, I'll bet you could easily get to 20 kV, if you knew what you were doing.

No, wait, it looks like someone's already done something like that....

http://www.youtube.com/watch?v=VNL8QTS0sM0

(Hmm...nearly a hundred views even before I get around to posting a link...looks like someone's keeping tabs...that's pretty scary when you think about it...)

[Harvey]

You mean like I did last night? The average current indicated on the Simpson in series was about 600 mA just before onset and about 1 or 1.2 amps during, and could go as high as 2 amps. During the "oscillations" my current-viewing shunt, which is made from 4 ea. 1.0 ohm 1/2 Watt precision resistors in parallel, gets noticeably warm and the mosfet and load get quite hot quite quickly. The voltage drop across the shunt looks like a continuous 500 to 600 milliAmps (EDIT: should read milliVOLTS of course, for a current of I = 0.6 / 0.25 or about 2.4 Amps ) with a bit of ripple on top, so the current is nearly continuous, even though the mosfet is spiking.

So I guess you'll have to save that beer for someone Else. I'm sure Aaron will be claiming it soon.

Why is your mosfet now on a heatsink, Aaron? Did you discover that it gets hot, after all?

I have to say, those waveforms you posted up yesterday have to be among the ugliest I've seen in my whole career, and I've seen some ugly ones. I'm the guy that got Unitrol Sirens MOSFET's to work as linear PA amplifiers without melting into the ground, and there were a few of those that made waveforms like yours - bleagh. Clean that up, will 'ya? 

[MileHigh]

Aaron:

On a "Rant" scale, that was a 9.5.

I have identified almost a dozen unique modes of oscillation from this one mosfet and have only showed a couple. The only oscillation he showed was the scope flatlining - and Milehigh proclaimed that is evidence the whole oscillation thing is a fraud. It is obvious they are intentionally deceiving people in a very willful and wanton manner.

Look, this circuit on paper was not purposefully designed to oscillate.  You get switching transients and ring-downs like you would for any other circuit.  You can apparently induce an oscillation with a flaky 555 timer circuit and/or possibly having the main spike induce a very robust 250 KHz spike-rate oscillation.

Nobody is arguing this point.  Any oscillations and excessive ringdowns are arguably undesirable in the sense that the circuit was not originally designed to do this.  However, you feel that this is the key to excess heat production or battery recharging, then go for it, nobody is stopping you.

What's just as interesting is trying to stop the oscillations with your trusty wet fingertip.  This would include touching the pins of the 555.  Just to explore and perhaps learn something.

There is no way in hell that any of us are intentionally deceiving anyone.  Come out of the reality distortion field, I don't know what else to say about that.

Suppose that you have an oscillator that outputs a fixed 10% duty cycle with a widely variable frequency range.  You connect it to the gate input and you start to sweep the frequency up.  As the frequency gets higher, you still are "on" 10% of the time but the average current through the coil will drop and continue to drop and hit zero when the frequency hits "infinity" with a 10% duty cycle.  That's a thought experiment.  Can you see that for yourself?

Yes indeed, in an older TK clip, he demonstrated/stumbled across that and you seem to think that was a conspiracy or something.

MileHigh

[MileHigh]

Aaron:

And by the way, the battery voltage didn't even drop 1/100th of a volt producing almost 150C at the load for the whole video. Let's see him replicate that as well - again, he doesn't have the necessary technical experience to do it

This is "garbage data" and you can't infer anything from it.

So what, you take the ampere-hours of the battery and compare it to the power drain and time period, and do what exactly with the fact that the battery voltage droped by 0.01 +/-0.005 volts?  (Assuming your meter has two digits of precision.)

MH