Hello all,

Recently I have began work on a large tesla coil and as it is finally working I though I would make a post.

Specs:
2x CM400
8x .5uf 2000v GTO snubber MMC
8x 8600uf 450v DC bus capacitors (4 parallel 2 in series)
6" by 34" secondary wound with 28awg wire
ring topload made with PEK plumbing line
3/8" primary coil
ud2.7 (I have a UD3 that will go in eventually but for testing the ud2.7 is easier)
all water cooled
Laminated bus bars (laser cut acrylic)

Will make another post when I do a full power test in the coming days.

Hello all,

I have some questions about a curious listing I found on ebay that appear to be perfect for my voltage multiplier. 

The only info is this photo

The seller lists them as 40w but gives no indication to their resistance or other specs, and messaging resulted in no response.

If anybody has ideas on the ratings of these resistors (if they even are resistors) let me know!

Thanks so much,
Davis

Hello all,

I am interested in buying some capacitors fit for a CW Cockcroft Walton multiplier stack. Input voltage will be around 50kv from a pretty big ferrite transformer. Looking to use about 6 stages (24 total capacitors). Frequency will be 80-150Khz. Screw terminals or axial leads work fine, although I would like to stay away from tab/hockey puck style caps.

Would like to trade, I have a wide variety of high power silicon (300-400a 600-1200v bricks). I also have lots of Scintillating crystals and also some decent sized electrolytic capacitors (5000uf if I remember correctly).

Also happy to pay via paypal or a similar service.

Thanks so much,
Davis

Large change to stuff that I am selling,

Variac has sold, as well as all the induction heater capacitors and electrolytics.

I no longer am selling my cm400 bricks although I still have many other types of IGBT’s available. I also have a large number of MPK snubber caps that I am now selling.

Some have brought up shipping, and while I maintain the belief that USPS flat rate is the best option within the USA, I’m happy to comply with the buyer on shipping requests.

Kindest regards,
Davis.

Induction heater is for general hobby use, melting an forging and whatnot.

Frequency range will be around 50-100khz, output power goal is around 15-20kw (will send photos of the inverter and other things shortly).

re did the design with SMD components and better component choice in general, attached are photos of the circuit and (poorly) routed PCB. This was my first time routing traces so I hope I didn't botch it too badly.

Thanks so much, Davis.

New England

Hello all,

I am cleaning out my lab and have about 10 large (9600uf 450v) electrolytic caps all in fairly good condition. I would prefer to sell them for about 20$ a piece although this is extremely negotiable. SOLD

I also have a large selection of IGBT bricks from cm400 to some relatively high speed bricks that are good for induction heating and even some one that work nicely in a QCW coil. If you are interested message me about part numbers and quantities. (Expect around 20$ per brick as well unless a better price can be found on eBay in which case I will lower the price to a couple below that)

I have some other more specialized things as well like cemet 700v 1000arms induction heater capacitors. (50$ a piece, think I have 2 up for grabs, again price is negotiable) SOLD

If you are looking for power electronic components please message me, happy to ship worldwide given that the buyer pays for shipping, although expect shipping to be a good amount for non USA forum users as all the components are quite heavy. Discounts if you buy more then one thing!

Kindest regards, Davis.

Finally finished my qcw! Here are some specs and some photos,

-UD3 driver (Psoc5 version)
Full bridge of FP7G75US60igbt’s with 1.5uf 2kv snubber capacitors
-single 6500uf dc bus capacitor (originally used a single 2200uf 450v capacitor but the voltage drop       
 was so much that it hindered performance)
-4-10nf mmc (taking Steve wards advice I am tuning via the mmc instead of the primary, I find this to be much cleaner)
-200mm tall 105mm wide secondary wound with 36awg wire (resonant frequency of 144khz)
-8 turn 10awg primary coil (was toroidal orginally but had to remove turns in the end)
-gdt’s and feedback transformer are run of the mill blue cores, Whatever was cheapest on arrow when I ordered

Hello,

I made 3 secondary coils for my QCW project but as it would turn out they are a bit under my needed resonant frequency. I would love to sell them to someone preferably in the US For material cost as I don’t have a use for them and don’t want to throw them out (about 7$ each plus shipping). They are 9” tall 4” wide and have about 2000t (36awg wire) and they all have varying amounts of varnish. Fair warning they all have some overlaps as the wire is very thin.

Thanks so much, Davis.

Awesome I’m glad to see this project is still active! I was messing around with a smaller coil today and was having some trouble playing songs, it seems that higher frequency notes got decreased in volume to the point where they were nearly 1/10th of the lower notes? Is this something silly that I’m missing in software? Thanks so much and I’m excited to see how this stick will develop even more in the future!

Thanks so much, Davis.