MH:

But what happens when she heats that water to 104 degrees C?  I mean, she claims to have done that before.  This tells me that her temperature measurement skills are no better than her electronics skills.  Therefore, I would doubt any results she obtained from the experiments you, and others, have suggested.

I also do not see the need for such large batteries, and so many of them.  It would take a very long time to run down the control set.  A charged supercap should be used instead making it a matter of hours for the control to be performed, not days, weeks or months.

Of course, then she will claim that part of the "magic" in her circuit is in the batteries themselves and removing them would change the results.  I think we should not expect her to perform any tests or experiments of a scientific nature, or we will be waiting a loooong time.

Bill

Bill:

QuoteBut what happens when she heats that water to 104 degrees C?  I mean, she claims to have done that before.

It's due to the high pressure atmosphere around Rosie.  Enough to make your ears pop.

MileHigh

Quote from: MileHigh on January 19, 2014, 11:46:22 AM
There is a lot of drama in flux, it's just like the good old days.  The issue of battery discharge rates and how much energy you can extract from a battery was covered by PicoWatt but I don't think it was ever acknowledged.  Rosemary is proposing swapping the batteries, so she should get symmetrical results.  THEN? lol

As long as she gets a pair of brand new batteries then let her rip Rosie!  Let's hope she can find someone to run the tests for her.  There is the technical challenge of setting up the right load resistor for the control experiment.  It would be a fun challenge to do a really good thermal setup and plan the execution of the test.  You could take a trip to a big-box hardware store and whip up something quite easily.  Get some styrofoam and some plastic pails and some insulation.  How many pails of water should my battery energy heat up?  How will I agitate it?  What should I use for a delta-t?  Should I measure the the thermal time constant of my insulated water vessel to make sure it is not likely to affect my results?  How do you check the batteries?

There is enough drama right there to fill a full season of episodes.

The test procedures that Ms. Ainslie has proposed are woefully inadequate.  They are also out of left field.  Until she improves her efficiency by about 5X she is outperformed by wires.  In order to show unambiguous gain she needs to improve by about 10X and get ~30W instead of ~3W when drawing ~15W from her batteries.  If she should ever get to the point that it looks like she is getting much more out of the heater than she draws from the batteries then she can try run down test following some reliable protocol.  If she jumps the gun then there are more or less two possibilities:  She and her collaborators will make gross mistakes and generate worthless data, or they will find that they don't get improved battery performance delivering the same heat as an appropriately selected resistor and wires while drawing the same amount of power from the batteries as does her current circuit.

QuoteCan someone here please help me with a simple self-oscillation circuit using my Inductive Resistor Heater Element as one of the circuit components and a minimum of other components like the MOSFET. It must also operate in a pulse width mode ... IOW with a well defined 'ON' period and a well defined 'OFF' period. I envision a tank circuit of some sort that 'clips' itself somehow. If it's not possible to use the element in the circuit that controls the MOSFET, that's OK. I just need a generic sort of design that can be adjusted. I'm trying to eliminate any parasitic loads that waste energy so my next slate of tests stand a chance of success.  I just haven't been able to get a 555 to properly control my driver chip ... it always fall short on the "crispness" end. If I could eliminate the driver chip, that would be great, but properly controlling a Power MOSFET at 500K+ Hz and 5% to 20% duty cycle usually requires one.

Thanks in advance,

Greg

That is not hard to arrange.  Do you want the non-oscillating period to saturate the switch conducting or not conducting, or do you need all three states:  oscillating, conducting, and off?  Since many MOSFET drivers accept logic inputs you can sharpen your 555 by using a logic gate such as a 74alvc1g14 with a resistor and diode to clip the input or by running the 555 from the same supply as the logic gate.  An inverting gate such as the xxx14 will make things easier on you anyway because 555's configured as astable multivibrators like to make long on duty-cycles.

http://www.youtube.com/watch?v=sIANNRpl6FA

(posted on July 13, 2012)

The same technique can be applied to the much higher-frequency circuit that is currently in Ainslie's "box". Inverter gates can be daisy-chained with little propagation delay, so one can have both inverted and noninverted outputs simultaneously depending on how many inverter gates you use. For higher speed and low power use one might choose a different inverter than the 4049.


Driving a power mosfet (IRFP460) at about 4 MHz using a self-triggering Class E amplifier circuit:
(no chips, mosfet gate is driven directly from a biased pickup loop under the main coil)

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