Rosemary Ainslie circuit demonstration on Saturday March 12th 2011

[Rosemary Ainslie]

I got them for nothing from a store that was closing down, and they're all brand-new!  They're also all rechargeable, (NiMH) so no problem there either.  Yes, I've got 300+ volts but I'm sure their combined resistance would prove a problem, especially where high current draw is involved - like here I expect!  But you're right, it needs to be tested...

WOW.  Then I'll be really interested here Sprocket.  Just one thing.  Try and get that 'immersion' heater type coil.  We know that it works.  I think - frankly - that the higher the resistance - the more applied voltage required.  But with all those batteries - you'd have no need to hold back. 

Really good news.  I'd be very interested to see how well those batteries last.  And if they're rechargeable then it's relatively easy to set up your controls.  Can't wait Sprocket.  This is going to be interesting.  Just think of it.  An immersion heater element with, perhaps, it's own in built battery supply rig. That's got to be good for campers and even for those who are off grid.  We've got such - in the millions.  Adds exponential meaning to the concept of 'instant coffee'.

Kindest regards,
jRosie 

[neptune]

Morning all .Struggling a bit today because I fell off my bicycle yesterday! @ Sprocket .All those batteries sound like a good find .What I would do is find a heater first and then select your battery voltage to give a current within their capabilities .You do not have to use all the batteries . It would be interesting to see your results . I am in the process of reading everything that has been written on this circuit .It is a bit like reading Tolstoy's "War and Peace". I keep thinking that this circuit could be run without a square wave generator of any kind , either by using a steady neg bias on the gate , or using a "tickler coil" magnetically linked to the load resistor , and thus creating an Armstrong Oscillator [google it]

[WilbyInebriated]

I got them for nothing from a store that was closing down, and they're all brand-new!  They're also all rechargeable, (NiMH) so no problem there either.  Yes, I've got 300+ volts but I'm sure their combined resistance would prove a problem, especially where high current draw is involved - like here I expect!  But you're right, it needs to be tested...

get a bunch of thorium (camping lantern mantles, etc.), radium from clocks and some tritium (as a neutron moderator)... use the lithium from the batteries to purify the the thorium ash...

[nul-points]

Morning all .Struggling a bit today because I fell off my bicycle yesterday!
...
I keep thinking that this circuit could be run without a square wave generator of any kind , either by using a steady neg bias on the gate , or using a "tickler coil" magnetically linked to the load resistor , and thus creating an Armstrong Oscillator [google it]

hi Neptune

sorry to hear about the tumble

hope you and the bike get mended soon!


your suggestion about driving the MOSFET direct from its output just reminded me about a circuit i'd seen a while back...

that wiley old Marcus Wagner seems to have beaten us to it, 6 years ago!!!

the thread is at:
 
   http://www.overunity.com/index.php?topic=413.0


of course, he used a double MOSFET series arrangement with the inductor, but the main switched current path is essentially the sort of thing we're looking at on this thread (the MOSFET body diodes still provide the same behaviour)

notice also that he rectifies the output pulses into a 1F cap which is across the battery, so again the same feedback to source (ie. looped) operation

(looks a bit like a MOSFET Joule Thief!)


i guess i should just add that i'm not suggesting this is a direct replacement for Rosemary's circuit with SigGen i/p - merely taking your idea to self-drive the circuit using feedback from the output

it could possibly be adapted to get it more into the mould of the RA circuit (eg, remove D1, change series MOSFETs to parallel, arrange drive signal to include some negative level, etc) 


hope this distracts you from the cuts & bruises! 
np


http://docsfreelunch.blogspot.com

[Sprocket]

I'm disappointed, I have just done a head-count, it seems I only have a little over 50 - off by a factor of 2!

@Rosemary - Forgive me if you have answered this like 100 times already, did you try this with high-wattage wire-wound resistors? As far as I can make out these are all bifilar wound so their inductance would be negligible - is inductance an absolute requirement here?  What I envision doing is piezo-fogging the water, then piping it over the likes of a wire-wound resistor, which is contained in a close-fitting tube of some kind to vapourise the stuff.  Not an option if inductance is a prerequisite though. 

@neptune - what I've been trying to determine is what would be the minimum voltage feasible for this.  As you suggest, the maximum current they are capable of is the limiting factor - and the more of them I tie in series, the greater their combined series resistance, the more power that will be dropped across them in the form of heat.  And this does not seem to be a low-current operation!  Which had me thinking supercaps - these could supply 100's of amps, but at low voltages.  I actually have quite a lot of these as well (5 ->360F) which I planned on reselling but haven't got around to yet - too many other balls in the air!

@WilbyInebriated - ...followed by "Abracadabra" no doubt!!!   Sorry, I have no idea where you are going with this...