Understanding electricity in the TPU.

[wattsup]

@gyulasun

Phew......... you are very right I got the companies mixed up. I will contact SemiSouth to purchase some of the following;

SJDP120R085 - Normally ON (That's the one I need in the center)
SJEP120R063 - Normally OFF (Never saw this one, will try to use it as a bidirectional NPN and PNP replacement.)
Pdf's are included below.

Also thank you for explaining how to negative pulse. It is much more clearer now but I will still have some learning curve and probably blow a few more JFETs.

Could you also please read what I will mention to @GK because I think there could be another way to pulse the coils.

@GK

What if SMs pulsing is done with a thermistor. SM kept on saying even insistingly that the devices get somewhat hot. Always hot, hot, hot. Maybe he was trying to tell us something. Remember he checks the OTPU heat with his fingers before he lifts it up. So what if he is using that heat to his advantage by finding the perfect thermistor that can cool off very very quickly in series with a properly designed coil that brings the heat up inside the thermistor. It would cut off, cool off, then connect again and re-start the cycling. No mosfet, no transistor, no pulser, nothing but a thermistor. That would equate with his statement that there was no mass circuitry in his devices. He also insisted that TPU builders use an overload cut-off in case the device went to overdrive. Could a thermistor offer such protection at the same time as offering a pulsing medium.

[giantkiller]

@wattsup,
He was driving them wrong. It is not amperage at all.
http://www.overunity.com/index.php?topic=8227.msg242361#msg242361

[gyulasun]

Hi wattsup,

Regarding thermistors I do not think they are even moderately fast devices, I cannot really imagine them for switching purposes in connection with LC circuits, rather they are mostly used for sensing heat. They have a so called thermic time constant measured in seconds and you would need a switching speed at least in the some hundred nanosecond range or even quicker I think. Thermistors reduce their resistance if the temperature they sense starts increasing, so when in series with a coil if they cool down their resistance would increase.

There are other passive devices like varistors that behave as an open circuit below a certain voltage amplitude and in case the voltage goes up suddenly beyond that amplitude then the device immediatly goes into a short circuit. (Almost like a Zener but the Zener tries to keep the voltage at the Zener voltage level, while the varistor loads down the voltage with a dead short when fires.) They are used mainly for transient voltage suppression to protect against overvoltage spikes and are made for wide voltage ranges, see this link chosen at random:
http://www.ventronicsinc.com/metal_oxide_varistors.htm  They are much much quicker than thermistors but they are not as quick as the above JFETs or 'normal' MOSFETs. If you wish to use varistors you have to think how it would serve best with its shorting property over a beyond voltage level. When the chosen voltage level does not exist any more between the two points the varistor is in parallel with, the varistor will become an open circuit again, ready to fire when voltage level gets increased again.
If you think this behavior is good for the TPU or for your purposes than consider using it, they are not expensive.

rgds,  Gyula

[wattsup]

@gyulasun

Thanks again for your information.

I looked up varistor and am putting an image below. It is rather incredible to see that these resemble a standard capacitor which can be plainly seen in the FTPU video, and, which I had pointed out on many occasions in the past as being located behind the center toroid. But now I realize they could easily have been one (or more) varistors. So this then becomes another avenue that must be tested.

[sparks]

  Tesla worked out a pyrloric generator.  The fire heated an iron core with tubes running through it.  At the ends of this core he wrapped some coils around it.  The core completed it's magnetic circuit through a horseshoe magnet.  The fire after passing over the core continued on to heat water in a boiler.  The steam from the boiler was intermittently caused to flow through the core of the generator.  This steam cooled the core and in so doing allowed the permanent magnet to cause the magnetic flux to establish in the interior of the output coils.  The changing magnetic field within the coils would cause the generator to put out upon dropping below the curie temperature of the core steel.  The steam was shut off and the thermal agitation of the core from the heat scource would destroy the magnetic flux of the core and the output coils would put out again.  Then the steam cooling more juice.  The fire heating more juice. Now say he takes the output of the generator and replaces the fire with resistive heating.  Remember only 1/2of the output is from the heating the other 1/2 is from the cooling.  So if 1/2 of the power is put into heating the core then whatever can be done to cool the core supplies the rest of the story.