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Topics - dbach

Pages: [1]
1
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.

2
Voltage Multipliers / Cockroft-walton resistors
« on: March 13, 2023, 05:59:40 PM »
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

3
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

4
Hello all,

I have just gotten my large induction heater functioning. I am slightly confused after inspecting the inverter output and tank circuit voltage on my oscilloscope. It appears that the tank voltage is double the frequency as my inverter output, and about 45* out of phase? any help interpreting this would be appreciated, I cannot make sense of it.

kindest regards,
Davis 

5
Electronic Circuits / Help with PLL induction heater driver
« on: September 12, 2022, 02:28:17 AM »
Hello all,

I have been working on my induction heater and have been recently working on the driver. I have modified The Backyard Scientists design (with permission) and have added a full bridge and ucc type driver for ease of use (nearly a copy of the UD type tesla coil driver power sections as it is a tried and true circuit) If anyone could look over the (awful) schematic and let me know if I made and stupid mistakes before I have them fabricated that would be much appreciated! 

thanks so much, Davis.

6
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.






7
Dual Resonant Solid State Tesla coils (DRSSTC) / Tophat QCW 1
« on: January 07, 2022, 02:27:35 AM »
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


8
Hello all!

I recently got my QCWDRSSTC working and since the secondary has a relatively low resonant frequency the sparks are very branchy. I was recently testing and something happened that I haven’t seen before, the coil sparked, the spark looped back around, hit the secondary about midway down, and then arced over to the primary. I was wondering if there was any way to prevent this? I’m wary of doing a strike rails because the topload is pretty close to the top of the primary. Photos attached.

9
Sell / Buy / Trade / WTS: small secondary coils
« on: January 03, 2022, 05:38:08 PM »
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.

10
Hello all,

A person on a HV discord server recently modified his VTTC for induction heating and it worked quite well. I would like to do a tube based project as I have siliconed myself out with a drsstc and this seems like a perfect project. does anyone here know of any tube based induction heaters that might be more efficient then a modified vttc one? There is barely any info online so help would be appreciated!

Thanks, Davis.

11
Hello, I have been working on my drsstc and have run into a problem with the driver. It seems that it just passes thru my interrupter signal and only amplifies it. I have been looking at the ud2.7 page and it seems that it should be closer to a 50% duty cycle wave (even if it is a 1.3b driver) any help on why it does this or how to fix it would be appropriate, cheers!

12
Sell / Buy / Trade / [WTB] Looking for bus capacitors
« on: May 15, 2021, 01:58:59 AM »
Looking for large dc bus caps for my DRSSTC project, looking for a single capacitor in the range of 4000-10000uf and 400-500v. Any help looking for listings or if anybody has capacitors that they would like to sell I would be more then interested!

13
Dual Resonant Solid State Tesla coils (DRSSTC) / Igbt question
« on: May 14, 2021, 09:05:19 PM »
Hi! I am building a drsstc and found a good deal for 4 MG300J2YS40 igbt’s, looking at the data sheet (which is very limited) I noticed that it has pretty slow switching speeds. I was wondering how well these work work in either a half or full bridge setup, and what kinda performance I could expect outa them? Any help with this directly or how to figure it out in my own would be loads of help, thanks in advance!

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