Steel melter for forty bucks? Needs a KW dc supply. Also $1 100nS 30KV! Also ALSO!

One seller of that inverter says water cooling is needed. I'm going to get one- looks like fun. I have a ferroresonant telecom power supply that needs a workout.

Might want to check, the original designer of that was retailing them west of 80$. I was holding off at 80, but was watching it. Never know these days when a product is a clone of a clone.

Steve

.com:

t of 80$.

a product is a clone of a clone.

the schematic is simple, roughly something like this:

-Lasse

On a sunny day (Sat, 21 Nov 2015 13:31:50 -0800 (PST)) it happened Bill Beaty wrote in :

Oh that is way cool, now I can finally melt my Plutanium.

Mm, I got 3 x 7V @ 20A meanwell switch mode supplies in series (for cryocooler) set to 8 V = 24V @ 20A = 480 W, nice for a solder pot?

What if I melt uranium marbles? ;-)

Oh man, got to get these

WHAT?? Can't hear ye

Ultrasonic drilling:

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this guy did it:

-Lasse

On a sunny day (Sun, 22 Nov 2015 06:50:50 -0800 (PST)) it happened Lasse Langwadt Christensen wrote in :

Very nice, watched all those videos, Lipo powered!

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Cr

-Lasse

On a sunny day (Sun, 22 Nov 2015 08:40:37 -0800 (PST)) it happened Lasse Langwadt Christensen wrote in :

I think he makes that error with the alligator leads (from China too possibly), at that current those drop several volts, on the ebay sellers page it says 'beware of slow rizing switchmodes, goes bang, and: too low voltage kills it (no oscillation).

He was heavely loaded because he already had the load (piece of metal tubing) in it when he switched on.

I may perhaps order one... Just to bake fish on the ocean and recharge via solar panel.

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yeh, if it doesn't start it is a dead short

the schematic is very simple, you can probably find most of the parts in your pile of parts

-Lasse

Nice, thanks.

Cheers, James Arthur

On a sunny day (Sun, 22 Nov 2015 11:34:45 -0800 (PST)) it happened Lasse Langwadt Christensen wrote in :

Ordered one... Did not have the MOSFETs and caps...

What I do not quite understand is that the solder pot guy uses a carbon container, and heats that up. is that not wasting energy? I would use a glass or some other non-reacting container and the 150 kHz RF will melt the solder by itself?

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ontainer, and heats that up.

RF will melt the solder by itself?

it isn't carbon, it is fiberglass insulation normally used to wrap exhausts

The container is a piece of iron pipe, induction heating works best with iron, I'm not even sure it will melt solder directly

-Lasse

In the video I saw, he switched the crucible to graphite, not an uncommon material for crucibles. Small pieces of anything are not easy to induce large currents in. The crucible is the right shape to get the maximum currents in while the raw stock is not.

Trivia: I designed and built a custom induction heater, which was sold to LANL, "definitely for not melting things". Nevermind that their "susceptor" was made of tantalum, with a hole in the bottom and a lever arm to plug it. :-)

Not really sure what they'd be building, this day and age. Guessing they have to keep things fresh and rebuilt, from time to time, so that includes the practical side of handling such elements.

Supposedly, plutonium is one of the most fascinating, rich, and challenging metals to handle, metallurgically speaking. Pure, it has something like five solid phases (between absolute zero and melting), huge expansion rates (several %) between transformations, and forms useful alloys with lots of elements. Gallium being the most common, which stabilizes one of the phases well enough so it can be cast and worked without fracturing into a million toxic pieces, or cracking the mold.

Tim

it isn't carbon, it is fiberglass insulation normally used to wrap exhausts

The container is a piece of iron pipe, induction heating works best with iron, I'm not even sure it will melt solder directly

-Lasse =======================================================================================

He used an iron pipe cap in the solder pot, but switched to carbon for melting aluminum. I'm sure he wouldn't waste a more expensive graphite crucible on a solder pot. Reading some of the ebay listings for zvs drivers, they mention that the crucible or work piece diameter should be less than 1/3 of the coil diameter to keep from overloading the driver, but in the ebay videos it looks to me like his solder pot and graphite crucible are over that, approaching 1/2 of the diameter. Is it just a matter of current limiting the dc supply, or is he risking the output transistors (or is my calibrated eye crooked :-))?

----- Regards, Carl Ijames

On a sunny day (Sun, 22 Nov 2015 12:55:52 -0800 (PST)) it happened Lasse Langwadt Christensen wrote in :

I dunno, it melts silly-con:

So currents are induced, and that heats it. My only Xperience with RF heating till now is this: In my 250 W 40 meter linear in the sixties (tube, 1kV) I tried a screwdriver in the tank coil, and it sure heated up. I also put (oops) a neon bulb in the tank coil, and then it lit up, after a few seconds it lit up REALLY bright. Too bright, I switched off, dreamt of lasers that night... My precious RF (rare at hat time) transistors in a metal cigar box next to it proved dead later, induced current?

There it is, and that was so long ago. Cannot wait to try some other stuff, enrichment (uche) of Xperience so to speak.

On a sunny day (Sun, 22 Nov 2015 15:26:56 -0600) it happened "Tim Williams" wrote in :

Yea, these days every kid has his own nuculear reactor I think. Mr Kim's hobby too.

I think the Uranium in my Uranium marbles is not depleted, so in theory most isotopes should be there, I do not think there is enough conduction in those marbles (or any other Uranium glass) to get it to melt in that thing. But it would be different with Uranium ore. There is a slight weight difference between those isotopes, but separation seems difficult, ultra centrifuge hexafluoride in steps. OTOH I remember a story from somebody who started with radium from old clocks, and the stuff got so hot in the end it got out of hand, they had to decontaminate the neighborhood.

Make your own RTG?

I see many sites that gave details of this have been 'falsified' to give the wrong setups / info.

That would not help against a gov determined to make a b*mb, but maybe against 10 year olds trying one.

When I grew up US boasted so much about the bomb that the blueprints (the correct ones) were in every comic I tell you.

So ;-) As a kid I went to an exhibition I think it was in Schiphol airport where they had everything from bubble chamber to those robotic arms manipulating the stuff. Radium in that time was used to light up light switches, watches...

I am still alive, was not so dangerous after all? later I worked so and THOSE guys were careless, lots of contamination happened in that place. Scientists are _not_ careful, trust me (tm).

On a sunny day (Sun, 22 Nov 2015 17:15:27 -0500) it happened "Carl Ijames" wrote in :

If you current limit then the voltage may drop below 12V and oscillation stops (the seller says).

You can however do cycle by cycle current limit, and that is absolutely something i will add, small current transformer in supply line , trigger flipflop, cut power (series MOSFET). I do that in the ultrasonic driver the same way. In fact I will after some initial test probably drive it with the same PIC circuit. And probably report here (an other Xperiment).

this one will run off the mains.

pity about the chinglish.