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Author Topic: Rosemary Ainslie circuit demonstration on Saturday March 12th 2011  (Read 741249 times)

Rosemary Ainslie

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Re: Rosemary Ainslie circuit demonstration on Saturday March 12th 2011
« Reply #210 on: March 22, 2011, 01:19:17 PM »
Guys, finally the video.  Apologies for the delays.

Kindest as ever,
Rosie

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

Pirate88179

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Re: Rosemary Ainslie circuit demonstration on Saturday March 12th 2011
« Reply #211 on: March 22, 2011, 01:58:20 PM »
Rose:

Great video.  Very well done.

Bill

Rosemary Ainslie

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Re: Rosemary Ainslie circuit demonstration on Saturday March 12th 2011
« Reply #212 on: March 22, 2011, 01:59:43 PM »
Rose:

Great video.  Very well done.

Bill

Thanks Bill.  I'll pass your comments on.  It had nothing to do with me.  The team rallied with this.  I agree.  It looks good. 

Kindest as ever,
Rosie

Sprocket

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Re: Rosemary Ainslie circuit demonstration on Saturday March 12th 2011
« Reply #213 on: March 22, 2011, 03:02:28 PM »
Nice video.  Apologies if this has been answered already but why was it necessary to use such 'beefy' batteries, those things are huge!

Rosemary Ainslie

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Re: Rosemary Ainslie circuit demonstration on Saturday March 12th 2011
« Reply #214 on: March 22, 2011, 03:32:11 PM »
Nice video.  Apologies if this has been answered already but why was it necessary to use such 'beefy' batteries, those things are huge!

Indeed.  They were donated Sprocket.  We were very glad of the donation.  But they are huge.  Surprisingly there's no wattage rating detailed.  Rather remiss.  We've still have to get that established.

Rosemary

Sprocket

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Re: Rosemary Ainslie circuit demonstration on Saturday March 12th 2011
« Reply #215 on: March 22, 2011, 05:25:57 PM »
Indeed.  They were donated Sprocket.  We were very glad of the donation.  But they are huge.  Surprisingly there's no wattage rating detailed.  Rather remiss.  We've still have to get that established.

Rosemary

It would have been nice to see the same charging-effect with much smaller batteries.  I had a stab at this when you were posting on EF but couldn't find anything out of the ordinary.  I managed to blow a few mosfets but still have a few unused ones still, might have another go.  I also have loads of Nokia 3.6v NiMH cell-phone batteries, 20-30 of these in series would match your setup, volts-wise anyway.  The 5-in-parallel thing is interesting - does this enhance the effect a lot, 5-fold perhaps?

Rosemary Ainslie

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Re: Rosemary Ainslie circuit demonstration on Saturday March 12th 2011
« Reply #216 on: March 22, 2011, 06:10:00 PM »
It would have been nice to see the same charging-effect with much smaller batteries.  I had a stab at this when you were posting on EF but couldn't find anything out of the ordinary.  I managed to blow a few mosfets but still have a few unused ones still, might have another go.  I also have loads of Nokia 3.6v NiMH cell-phone batteries, 20-30 of these in series would match your setup, volts-wise anyway.  The 5-in-parallel thing is interesting - does this enhance the effect a lot, 5-fold perhaps?

Hi again Sprocket.  It would be good to see your results here.  Everyone's interested in exploring which batteries and what exactly they contribute.  The difference with this and previous tests is only in that negative triggered oscillation.  That's the parasitic oscillation that's normally thrown away.  What we see is that this allows for a hefty current flow and my own take is that - in parallel - they can manage the current potential that one MOSFET by itself - just doesn't.  But there are other things that are strange.  I'll try and get around to this later on tonight. 

Not sure why your previous didn't work.  That early test is actually very easily replicated.  But it probably needs the help of a high level scope - just to tease out the right tuning.  Not the easiest.  And one needs to know what to look for.  Again.  For me this side of the exercise is relatively easy.  I have never been hampered by conventional expectations.  LOL.  I think there may be some advantages to not having a classical training.  Perhaps.  Anyway.  Good luck with your efforts.  I'm sure we'd all like to hear what happens - good or bad.  It's all likely to add to the general pool of knowledge.  Never a bad thing.

Kindest regards,
Rosemary   

neptune

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Re: Rosemary Ainslie circuit demonstration on Saturday March 12th 2011
« Reply #217 on: March 22, 2011, 08:07:38 PM »
I found this video to be clear and informative . Vital info is here for the taking .As I long suspected , the input signal on the mosfet gate toggles between about 5 volts positive and 4 volts negative . This is not a wave form you are going to get with the published 555 timer circuit as it stands . There are people reading here who could overcome this problem of voltage offset . Of course on the video it is overcome using a function generator to do the job . Rosemary , a sudden thought . If it is the Zener diodes that form the path for oscillation , why not just add additional zeners across the drain and source terminals of the fets , in parallel with the internal diodes , and see if the effect is enhanced ? Choose the diodes to have a breakdown voltage just higher than the highest battery voltage .

Rosemary Ainslie

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Re: Rosemary Ainslie circuit demonstration on Saturday March 12th 2011
« Reply #218 on: March 22, 2011, 08:11:08 PM »
I found this video to be clear and informative . Vital info is here for the taking .As I long suspected , the input signal on the mosfet gate toggles between about 5 volts positive and 4 volts negative . This is not a wave form you are going to get with the published 555 timer circuit as it stands . There are people reading here who could overcome this problem of voltage offset . Of course on the video it is overcome using a function generator to do the job . Rosemary , a sudden thought . If it is the Zener diodes that form the path for oscillation , why not just add additional zeners across the drain and source terminals of the fets , in parallel with the internal diodes , and see if the effect is enhanced ? Choose the diodes to have a breakdown voltage just higher than the highest battery voltage .

Hello Neptune.  We've used diodes across the switch - often.  It works.  But I've never seen anything work like this does.  If we need more current drawn then it's possibly for that 'booster' mode.  Then - I'm quite simply more anxious to hold back the potential than otherwise.  It's already spiking at values that are almost too big for our DSO's. 

Kindest regards
Rosemary

neptune

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Re: Rosemary Ainslie circuit demonstration on Saturday March 12th 2011
« Reply #219 on: March 22, 2011, 09:02:05 PM »
Hi Rosemary . Could you please clarify two points from the video . Is the heating element in the canister immersed in water , or just air . Also , the 5 mosfets are mounted on separate heatsinks . Are these heatsinks electrically isolated /insulated from each other? From the experimenters point of view , does the higher efficiency of the present element justify its additional complexity and expense when compared to a simple wire wound element on a ceramic core?

cHeeseburger

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Re: Rosemary Ainslie circuit demonstration on Saturday March 12th 2011
« Reply #220 on: March 22, 2011, 09:49:20 PM »
Rosemary,

At 8:40 into the video, while your colleague is demonstrating 190C on the load with a 50VDC battery voltage, there is a good closeup of the LeCroy which shows that there is +243mV (about 1 Ampere on a 0.25 Ohm shunt) flowing out of the battery.

Could you please explain to everyone why the scope math that is showing us the product of the +243 mV trace and the +50.3 VDC battery voltage is telling us that the product is -5.43 VV?  How does the scope get a negative small number by multiplying two positive numbers?  By my figuring (even without using a calculator) 1A x 50VDC = 50 Watts.  All positive numbers flowing out of the battery.

Please clear this up.  It's rather confusing.  Thank you.

cHeeseburger
« Last Edit: March 22, 2011, 11:05:18 PM by cHeeseburger »

woopy

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Re: Rosemary Ainslie circuit demonstration on Saturday March 12th 2011
« Reply #221 on: March 23, 2011, 12:20:19 AM »
Hi Magluvin

thank's very much for your reply 208 and included schematic
 
i did a small test of your idea and hope this is not too much off topic here ;)

perhaps you should open a specific thread for this specific idea  ?

http://www.youtube.com/watch?v=XrwgEb5ac_w

And of course my BRAVO to Rosemary and her team for sharing  :)

good luck at all

laurent

hartiberlin

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Re: Rosemary Ainslie circuit demonstration on Saturday March 12th 2011
« Reply #222 on: March 23, 2011, 12:46:18 AM »
Good question Cheesiebugger,

it probably comes from the Minus 70 Volts offset in the channel 2
which is not substracted.
So channel 2 had about -20 Volts x 245 mV= about - 5 VV...

So the multiplication settings of the scope was not set right at this time.

But much more interesting is this attached scopeshot,
where you can see that the mean current at the shunt is really negative.
Not only from the numbers that show Minus 25 MilliVolts
but also from the display of the yellow burst showing more amplitude
below the ground line.

The ground line is the left yellow line at the number 1.

So in this condition is  really seems to charge the batteries.

Depends probably all on the working points it is running on.

So the first shown test seems to recharge the batteries but the
second one seems to discharge them at the higher temperature...

Regards, Stefan.
P.S. Well done video Rosemary !
Thanks a lot.
Clears up many questions.

cHeeseburger

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Re: Rosemary Ainslie circuit demonstration on Saturday March 12th 2011
« Reply #223 on: March 23, 2011, 01:53:10 AM »
So you agree that he second test shows 44W of heat costing 50W of battery drain, right?  And thank you for clearing my post.  It is an honor to be allowed to post here once in a while.  I'll not abuse the privilege,

Regarding the first test, then, we all agree that it would have been nice if Rosemary had given us a shot or two showing the actual waveform of the oscillation, rather than exclusively showing low-sweep-speed shots of the 100Hz duty cycle where no one can see the cycle by cycle shape of the actual oscillations.

SInce we know that the actual power into or out of the battery depends on the areas under the curves above and below zero and not on the peak voltage excursions there, and we acknowledge never having been showed those areas at any time, how can we conclude anything realistic about the first test based on only those peak excursions and the math trace which we agree was faulty and in error on the second test?

What if the cyclic oscillation waveform looks like this picture?

Sincerely,

Cheesebreath

hartiberlin

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Re: Rosemary Ainslie circuit demonstration on Saturday March 12th 2011
« Reply #224 on: March 23, 2011, 02:23:18 AM »
Then the yellow burst would probably have looked different,
but I agree, that we need better zoomed in waveforms,
showing only 3 or 4 cycles and not this burst only.