ENERGY AMPLIFICATION

[Magluvin]

ok   here is some items that can be had for this experiment.  A 2mh coil made of 16awg wire that came from mid 80s passive sub cross-over supplies, and I have 16 560nf 1kv caps that I can arrange up to 8kv at 560nf or a few other values to work in the range of the circuit I posted last.   
The key is to be able to discharge the cap into the coil with an electronic cutoff when the cap reaches 0v, or the cap will start charging the other direction and if released at other than 0v the oscillation voltage will suffer.
I have some ideas i will try electronically. Tesla used motorized rotational switching that was tuned for what he needed and could produce even a rectifying effect from it.

Mags

[forest]

yep,the key is how fast you make magnetic field around and how fast it collapse (in other ways how fast you cut off powering source)

[Magluvin]

I was just investigating some materials on microwave oven circuitry and operation. I saved a transformer, a diode, and a cap from a scrapped unit and just wondered exactly what goes on in there. And also what can I do with these parts and what they can do for me. 
I found a very interesting description of the transformers they use and why there is a gap in the center core.

Here is the description  and I found it here   http://repairfaq.ece.drexel.edu/sam/micfaq.htm#micwdmleak

High voltage transformer
(From: John De Armond.)

The transformer goes by several names, depending on where you are. Variable reluctance, leakage flux, stray flux, etc. It is exactly the same construction and operating principle as a neon transformer, some kinds of HID light ballasts and some series streetlight constant current transformers.

The core is an almost standard "E" core (or "H" core if you prefer) with one exception. The center leg has an air gap. The windings are on the end legs of the "E" instead of the center leg.

There are two magnetic paths around the core for the field set up by the primary to travel. Around the periphery and across the secondary and around the center leg and across the air gap. The field that travels along the center leg does not cross the secondary and induces no voltage.

With no load applied, the bulk of the field travels the peripheral, very much lower reluctance solid iron path, inducing full secondary voltage proportional to the turns ratio. As current flows in the secondary, counter-MMF raises the reluctance of the peripheral path so that some of the flux travels through the center leg. With less flux traveling around the periphery and cutting across the secondary, the secondary voltage drops as the current remains about the same. At the limit, if the secondary is shorted, the peripheral path has so much reluctance that most of the flux travels the center leg and across the air gap. The same current as before flows through the secondary but at zero volts.

When the dimensions of the core and gap are set up correctly, the transformer behaves as an almost perfect constant current device. That is, the secondary voltage varies as necessary to keep the same current flowing through a varying load. Just what the doctor ordered to keep the magnetron happy.

The secondary current can be increased by opening up the air gap. This raises the reluctance of that path and forces more field through the secondary leg. Closing the gap has the opposite effect.

The center leg is often called the magnetic shunt and frequently it is a separate piece of laminated iron stuck between the coils and TIG welded in place. It is a common trick for Tesla Coilers to open up a neon transformer and either knock out the shunt entirely or grind it down to open the air gap. This modification causes the transformer to output much more current than it is designed for - for a little while, at least :-) The same thing works with microwave oven transformers (MOT).

This design in a microwave oven is a vital part of keeping the magnetron anode current within spec. The magnetron is electrically a diode. A diode that isn't emission-limited would draw destructive current if not externally limited. With this design, the filament can be heated good and hot for long life and not have the tube run away. The design also is vital for protecting the magnetron from potentially damaging conditions such as operating the oven empty, arcing, etc.

It's popular to use several MOTs to build an arc welder. This works quite well specifically because these transformers are constant-current devices - exactly the characteristic stick welding needs. If they were conventional transformers, the first time the rod touched the work and shorted the secondary, fault current would flow and the breaker would trip or blue smoke would leak out.

Along similar lines, one can cut off the high voltage secondary and replace it with a suitable number of turns of heavy wire, connect a bridge rectifier and have a nice constant current battery charger. Select the turns carefully and it'll do the bulk/absorption stages of the smart 3 stage charging algorithm.



Mags

[Magluvin]

Correction in the above picture,   the caps are 560pf 1kv     

Mags

[void109]

I was playing with the circuit sim today after reading your posts here.  It seems not-too-difficult to get seeming OU configurations of RLC circuits using it.  Is this maybe just a flaw with the sim?

This one appears to take 1W in for 5W out: (attached txt file for the falstad circuit sim)