On Sunday, November 22, 2015 at 9:51:01 AM UTC-5, Lasse Langwadt Christensen wrote:> Den s�ndag den 22. november 2015 kl. 08.28.54 UTC+1 skrev Jan Panteltje: > > On a sunny day (Sat, 21 Nov 2015 13:31:50 -0800 (PST)) it happened Bill Beaty > > <billb@eskimo.com> wrote in > > <7d265764-4580-446a-9921-226475c931db@googlegroups.com>: > > > > > > > >The woods are full of these today: > > > > > > 1000W 12-48V 20A ZVS High Frequency Low Voltage Induction Heating Board > > > http://www.ebay.com/sch/i.html?_nkw=1000w+induction+heating&_sop=15 > > > > > > Oh that is way cool, now I can finally melt my Plutanium. > > https://www.google.nl/search?q=molten+plutonium&biw=1670&bih=850&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwjOh9r8vqPJAhVBvxoKHTcBBpEQsAQILw > > > > > > >I wonder if they'll levitate an aluminum chunk before meltin git? Bend > > >the coil into cone shape. Probably needs water. > > > > > >For a 20A supply I'd rectify AC line with an SCR halfbridge dimmer, > > >crank it down to 48V. Or maybe a cheap 220:120 kilowatt xfrmr > > >hooked backwards. Those "international voltage converter" big > > >transformers aren't too expensive, especially if they're free in > > >your garage junkpile. > > > > > > 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? > > > > this guy did it: > > https://www.youtube.com/playlist?list=PLHGVjZ_tV_gy_50UzOqswMe_M-Ou7hPCr > > > -LasseThat's interesting thanks. Can I ask a silly question? He's changing the main coil, but the coil inductance has to set the frequency. Did he just get lucky... or will it work over a range of frequencies? George H.
Steel melter for forty bucks? Needs a KW dc supply. Also $1 100nS 30KV! Also ALSO!
Started by ●November 21, 2015
Reply by ●November 23, 20152015-11-23
Reply by ●November 23, 20152015-11-23
Den mandag den 23. november 2015 kl. 16.43.11 UTC+1 skrev George Herold:> On Sunday, November 22, 2015 at 9:51:01 AM UTC-5, Lasse Langwadt Christensen wrote: > > Den s�ndag den 22. november 2015 kl. 08.28.54 UTC+1 skrev Jan Panteltje: > > > On a sunny day (Sat, 21 Nov 2015 13:31:50 -0800 (PST)) it happened Bill Beaty > > > <billb@eskimo.com> wrote in > > > <7d265764-4580-446a-9921-226475c931db@googlegroups.com>: > > > > > > > > > > >The woods are full of these today: > > > > > > > > 1000W 12-48V 20A ZVS High Frequency Low Voltage Induction Heating Board > > > > http://www.ebay.com/sch/i.html?_nkw=1000w+induction+heating&_sop=15 > > > > > > > > > Oh that is way cool, now I can finally melt my Plutanium. > > > https://www.google.nl/search?q=molten+plutonium&biw=1670&bih=850&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwjOh9r8vqPJAhVBvxoKHTcBBpEQsAQILw > > > > > > > > > >I wonder if they'll levitate an aluminum chunk before meltin git? Bend > > > >the coil into cone shape. Probably needs water. > > > > > > > >For a 20A supply I'd rectify AC line with an SCR halfbridge dimmer, > > > >crank it down to 48V. Or maybe a cheap 220:120 kilowatt xfrmr > > > >hooked backwards. Those "international voltage converter" big > > > >transformers aren't too expensive, especially if they're free in > > > >your garage junkpile. > > > > > > > > > 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? > > > > > > > this guy did it: > > > > https://www.youtube.com/playlist?list=PLHGVjZ_tV_gy_50UzOqswMe_M-Ou7hPCr > > > > > > -Lasse > > That's interesting thanks. > Can I ask a silly question? > He's changing the main coil, but the coil inductance has to set the frequency. > Did he just get lucky... or will it work over a range of frequencies? > > George H.it'll work over a range of frequencies Version 4 SHEET 1 880 680 WIRE -32 -112 -160 -112 WIRE 32 -112 -32 -112 WIRE 208 -112 32 -112 WIRE 288 -112 208 -112 WIRE 208 -80 208 -112 WIRE 288 -80 288 -112 WIRE -32 -16 -32 -112 WIRE 32 -16 32 -112 WIRE -160 48 -160 -112 WIRE 208 48 208 0 WIRE 208 48 144 48 WIRE 272 48 208 48 WIRE 352 48 272 48 WIRE 416 48 352 48 WIRE 32 128 32 64 WIRE 80 128 32 128 WIRE 96 128 80 128 WIRE 80 176 80 128 WIRE 416 208 416 48 WIRE 352 224 352 48 WIRE -160 256 -160 128 WIRE 80 256 -160 256 WIRE 144 256 144 144 WIRE 144 256 80 256 WIRE 80 288 80 256 WIRE -160 384 -160 256 WIRE 144 384 144 256 WIRE -32 400 -32 64 WIRE 80 400 80 368 WIRE 80 400 -32 400 WIRE 96 400 80 400 WIRE -32 448 -32 400 WIRE 32 448 32 128 WIRE 256 480 144 480 WIRE 288 480 288 0 WIRE 288 480 256 480 WIRE 352 480 352 288 WIRE 352 480 288 480 WIRE 416 480 416 288 WIRE 416 480 352 480 WIRE 256 512 256 480 WIRE 256 512 32 512 WIRE -32 544 -32 512 WIRE 272 544 272 48 WIRE 272 544 -32 544 FLAG -160 384 0 SYMBOL ind2 400 192 R0 SYMATTR InstName L1 SYMATTR Value 1� SYMATTR Type ind SYMBOL ind 272 -96 R0 SYMATTR InstName L2 SYMATTR Value 150� SYMBOL ind 192 -96 R0 SYMATTR InstName L3 SYMATTR Value 150� SYMBOL nmos 96 48 R0 SYMATTR InstName M1 SYMATTR Value IPB107N20N3 SYMBOL nmos 96 480 M180 SYMATTR InstName M2 SYMATTR Value IPB107N20N3 SYMBOL cap 336 224 R0 SYMATTR InstName C1 SYMATTR Value 2� SYMBOL voltage -160 32 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 WINDOW 3 -255 54 Left 2 SYMATTR InstName V1 SYMATTR Value PULSE(0 24 0 10m) SYMBOL res -48 -32 R0 SYMATTR InstName R1 SYMATTR Value 470 SYMBOL res 16 -32 R0 SYMATTR InstName R2 SYMATTR Value 470 SYMBOL diode -48 448 R0 WINDOW 3 -1 106 Left 2 SYMATTR InstName D1 SYMATTR Value 1N4148 SYMBOL diode 16 448 R0 WINDOW 3 28 107 Left 2 SYMATTR InstName D2 SYMATTR Value 1N4148 SYMBOL res 64 272 R0 SYMATTR InstName R3 SYMATTR Value 10k SYMBOL res 64 160 R0 SYMATTR InstName R4 SYMATTR Value 10k TEXT -192 552 Left 2 !.tran 15m
Reply by ●November 23, 20152015-11-23
On Sunday, November 22, 2015 at 11:47:48 PM UTC-8, Jan Panteltje wrote:> Too bright, I switched off, dreamt of lasers that night...Tried that in a microwave; trying to map the nodes. After 10sec many of them melted and made little sucky-holes! All the vacuum escaped. So, tried again with NE2s submerged in water. Still melted, this time ended up water-filled. Approved methods: wet thermal fax paper on cardboard, it turns black from 100c water, makes big fuzzy flower patterns. Or, cobalt chloride on paper, pink when damp, blue at the antinodes once the steam has fled.> 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.
Reply by ●November 23, 20152015-11-23
On Monday, November 23, 2015 at 7:43:11 AM UTC-8, George Herold wrote:> That's interesting thanks. > Can I ask a silly question? > He's changing the main coil, but the coil inductance has to set the frequency. > Did he just get lucky... or will it work over a range of frequencies?The ebay boards look to be oscillators, and the heating coil is the "L" of LC. That's a handy trick for all sorts of RF heating and power supplies, if you aren't trying to hit 13.5MHz.
Reply by ●November 23, 20152015-11-23
On a sunny day (Mon, 23 Nov 2015 10:29:39 -0800 (PST)) it happened Bill Beaty <billb@eskimo.com> wrote in <57eb51e4-ec5a-41f4-a491-b425c692383b@googlegroups.com>:>On Sunday, November 22, 2015 at 11:47:48 PM UTC-8, Jan Panteltje wrote: > >> Too bright, I switched off, dreamt of lasers that night... > >Tried that in a microwave; trying to map the nodes. After 10sec many of them melted and made little sucky-holes! All the >vacuum escaped. > >So, tried again with NE2s submerged in water. Still melted, this time ended up water-filled. > >Approved methods: wet thermal fax paper on cardboard, it turns black from 100c water, makes big fuzzy flower patterns. Or, >cobalt chloride on paper, pink when damp, blue at the antinodes once the steam has fled.So what would happen if you put one of these in that coil: http://www.ebay.com/itm/301321475127 ?
Reply by ●November 23, 20152015-11-23
sroberts6328@gmail.com wrote:> 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.Just ordered one for $38.something. While the board does look real simple, I think the exploding your own parts to get it right would exceed the price of the ebay one.
Reply by ●November 24, 20152015-11-24
On a sunny day (Mon, 23 Nov 2015 10:29:39 -0800 (PST)) it happened Bill Beaty <billb@eskimo.com> wrote in <57eb51e4-ec5a-41f4-a491-b425c692383b@googlegroups.com>:>On Sunday, November 22, 2015 at 11:47:48 PM UTC-8, Jan Panteltje wrote: > >> Too bright, I switched off, dreamt of lasers that night... > >Tried that in a microwave; trying to map the nodes. After 10sec many of them melted and made little sucky-holes! All the >vacuum escaped. > >So, tried again with NE2s submerged in water. Still melted, this time ended up water-filled. > >Approved methods: wet thermal fax paper on cardboard, it turns black from 100c water, makes big fuzzy flower patterns. Or, >cobalt chloride on paper, pink when damp, blue at the antinodes once the steam has fled.PS, following the flow, and via ultrasonic washing of clothes: https://www.indiegogo.com/projects/dolfi-next-gen-washing-device#/ and then I remembered sonoluminecense: https://en.wikipedia.org/wiki/Sonoluminescence and the whole fight over is fusion happening or not: https://en.wikipedia.org/wiki/Bubble_fusion I came across this video: https://www.youtube.com/watch?v=LWO93G-zLZ0 Somehow it automatically showed this as the next one: https://www.youtube.com/watch?v=BR4GNFg5sEI I dunno about his long exposure times, but I now have several Sony starlight cameras :-) So I will put this experiment first on the list. If I see it correctly (stopped the video) his signal generator box outputs only 10V??? Also I have some detection equipment... Now, :-) For induction experiments: Did you know these are only 2$54 free shipping: http://www.ebay.com/itm/131658613713 And these 99 cents for two, free shipping too of course, but not sure how to form the coil: http://www.ebay.com/itm/371480616158 The world is full of mysteries...
Reply by ●November 24, 20152015-11-24
On 11/24/2015 6:25 AM, Jan Panteltje wrote:> > I came across this video: > https://www.youtube.com/watch?v=LWO93G-zLZ0RE; sonoluminescence Back about 15 years ago I worked at a company building High power High frequency ultrasonic amps and transducers. Our basic unit had a 2" piezo ceramic transducer and was driven at 660kHz with up to 1000 watts. We could set it in a 20" aquarium filled with water. Dark adjust our eyes and when powered up, we could see a 2" sonoluminescent beam from the transducer hit the glass 20" away the reflect back to the other side of the aquarium. We had the transducer at a slight angle so it would reflect off the wall at an angle. This was multibubble luminescence, This was supposed to be the advantage of our high frequency system, the thousands and thousands of bubble collapses were able to enhance the *reaction. When we used a focused reflector, you could see a white fuzzy area in the foci and hear a hiss from the ball of cavitation. * I guess we never found the proper reaction to enhance, as the company is no longer in business. :-) I miss it. Our claim to fame was selling a 4000 watt unit to CalTech. It had a 1 gallon flow through vessel with four--4 inch x 4 inch transducers. Mikek
Reply by ●November 24, 20152015-11-24
On a sunny day (Tue, 24 Nov 2015 08:37:22 -0600) it happened amdx <nojunk@knology.net> wrote in <n31sj0$g82$1@dont-email.me>:>On 11/24/2015 6:25 AM, Jan Panteltje wrote: > >> >> I came across this video: >> https://www.youtube.com/watch?v=LWO93G-zLZ0 > >RE; sonoluminescence > >Back about 15 years ago I worked at a company building High power High >frequency ultrasonic amps and transducers. > >Our basic unit had a 2" piezo ceramic transducer and was driven at >660kHz with up to 1000 watts. > >We could set it in a 20" aquarium filled with water. Dark adjust our >eyes and when powered up, we could see a 2" sonoluminescent beam from >the transducer hit the glass 20" away the reflect back to the other side >of the aquarium. >We had the transducer at a slight angle so it would reflect off the wall >at an angle. > > This was multibubble luminescence, This was supposed to be the >advantage of our high frequency system, the thousands and thousands of >bubble collapses were able to enhance the *reaction. > When we used a focused reflector, you could see a white fuzzy area in >the foci and hear a hiss from the ball of cavitation. > >* I guess we never found the proper reaction to enhance, as the company >is no longer in business. :-) I miss it. > Our claim to fame was selling a 4000 watt unit to CalTech. >It had a 1 gallon flow through vessel with four--4 inch x 4 inch >transducers. > > MikekThat is good to know. I want to do a simple experiment with the transducer end (40 kHz) itself a bit under water. | [] | glass vessel. |~~~/\~~~ | | | >[ ]- -Sony starlight camera | | --------- (not to scale) And I want to do this remote, from an other room, and wit hear plugs, as I do not want to listen to that high pitch noise for an other few days.... I did a hearing test (frequency response) on both ears after this, still seems to work, but why take the risk. Still waiting for the big transformer cores so I can put the final thing together, nice waterproof housing and connectors did arrive. That guy in the video works through the glass, dunno why... Coupling with hotglue, seems compicatiatiated to me.... Now I have to read up on neutron detectors I guess..
Reply by ●November 24, 20152015-11-24
On 11/24/2015 8:59 AM, Jan Panteltje wrote:> On a sunny day (Tue, 24 Nov 2015 08:37:22 -0600) it happened amdx > <nojunk@knology.net> wrote in <n31sj0$g82$1@dont-email.me>: > >> On 11/24/2015 6:25 AM, Jan Panteltje wrote: >> >>> >>> I came across this video: >>> https://www.youtube.com/watch?v=LWO93G-zLZ0 >> >> RE; sonoluminescence >> >> Back about 15 years ago I worked at a company building High power High >> frequency ultrasonic amps and transducers. >> >> Our basic unit had a 2" piezo ceramic transducer and was driven at >> 660kHz with up to 1000 watts. >> >> We could set it in a 20" aquarium filled with water. Dark adjust our >> eyes and when powered up, we could see a 2" sonoluminescent beam from >> the transducer hit the glass 20" away the reflect back to the other side >> of the aquarium. >> We had the transducer at a slight angle so it would reflect off the wall >> at an angle. >> >> This was multibubble luminescence, This was supposed to be the >> advantage of our high frequency system, the thousands and thousands of >> bubble collapses were able to enhance the *reaction. >> When we used a focused reflector, you could see a white fuzzy area in >> the foci and hear a hiss from the ball of cavitation. >> >> * I guess we never found the proper reaction to enhance, as the company >> is no longer in business. :-) I miss it. >> Our claim to fame was selling a 4000 watt unit to CalTech. >> It had a 1 gallon flow through vessel with four--4 inch x 4 inch >> transducers. >> >> Mikek > > That is good to know. > I want to do a simple experiment with the transducer end (40 kHz) itself a bit under water. > > | [] | glass vessel. > |~~~/\~~~ | > | | >[ ]- -Sony starlight camera > | | > --------- (not to scale) > > > And I want to do this remote, from an other room, and wit hear plugs, > as I do not want to listen to that high pitch noise for an other few days.... > I did a hearing test (frequency response) on both ears after this, still seems to work, but why take the risk. > Still waiting for the big transformer cores so I can put the final thing together, > nice waterproof housing and connectors did arrive. > > That guy in the video works through the glass, dunno why... Coupling with hotglue, seems compicatiatiated to me.... > > Now I have to read up on neutron detectors I guess.. >Do you just want to see the sonoluminescence or do you want to trap a single bubble? Ya, I would think the hot glue would be lossy. On our lab system we isolated the transducer face from the solution under test with a thin 0.003" clear FEP Teflon sheet. The transducer was in ice water while the solution under treatment was at any desired temperature. BTW, we had one customer replace the FEP Teflon to PTFE Teflon, during experiments, and lost his kill rate. He was killing pathogens in milk. Hey, I pulled a picture of the setup from the Wayback Machine.> https://web.archive.org/web/20070222075632/http://www.ultrasonic-energy.com/setup.jpgIn it you will see the transducer, a gap for the cooling water, then the flanges pinching the Teflon window, the RED solution under test and then an air cavity formed with the aluminum cup over the concaved glass end for focusing the ultrasound. (the brick wrapped in black duct tape was just to hold the vessel in position for the picture) Glass/water interface does not reflect ultrasound like a glass/air interface. Mikek
