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Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
TheBoozer wrote ...
Holy cow dude!!! It looks like the secondary was hit by a flame thrower...
Is that all carbon I see???
Rich
Mostly carbon - yeah, large amounts of soot were emitted from the arc fault and spread all over the secondary. The fire melted about 10mm longth of windings and carbonized the form underneath... it wasn't worth fixing till this day.
Avalanche: Did it oscillate at all even with no breakout? What is that chip you were using? (UCC's generally don't make too good TC drivers, IXDD414's do much better)
Registered Member #103
Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
Marko wrote ...
Avalanche: Did it oscillate at all even with no breakout? What is that chip you were using? (UCC's generally don't make too good TC drivers, IXDD414's do much better)
It didn't oscillate... it didn't blow up... it didn't even get warm... in fact it did absolutely sod-all
The driver chip was an ICL7667, but I think the resonant frequency of that coil was several Mhz and probably completely swamped out by it's own capacitance.
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
One of my recent fails (december 2009) was a quickly smacked together DRSSTC using a couple of TO-247 40N60s IGBT...
It was running in high bps going towards CW at 300~KHz, badly out of tune and without any feedback or OCD it was fed the drive signal from a signal generator...
No need to say it died quickly and never gave more than 3-4 cm sparks :D
Registered Member #2989
Joined: Sun Jul 11 2010, 12:01AM
Location: UK
Posts: 94
my first DC powered tesla coil Rotary spark gap making the jump to light speed cause of fault stainless steel being to soft fix use tungsten welding rods
Registered Member #1589
Joined: Sun Jul 13 2008, 06:40PM
Location:
Posts: 70
That's a pretty set of pictures you have Blackcurrant. I've always wondered about how stainless would look in a high energy rotary spark gap... What kind of stainless did you use?
Edit: Forgot my spark gap failure. I eventually had a piece of tungsten fly out of this thing. I'm happy I had a 1/4" Plexiglas box around this thing just in case this happened. The center pieces are 3/16" in dia and the rotor has an overall width of 14" from tip to tip and was rotating at 3600RPM. Unfortunately I do not have any pics of the damage to the box.
Registered Member #2989
Joined: Sun Jul 11 2010, 12:01AM
Location: UK
Posts: 94
Hi Anon think it was M3x20 316 A4 bolt that was melting fast the tungsten rod (pic with safety screwdriver) worked far better and it would auto balance as it wore down rotary gap could spin up to about 400Hz and it did have some hard plastic as a shield.
Registered Member #2422
Joined: Tue Oct 06 2009, 02:41AM
Location:
Posts: 85
Grounding fail!
I got so excited that I finally got the class-e amp tuned right that I forgot to add proper rf ground. I had the bottom lead from the coil sticking up inside it to give a stable Fres during tuning. When I turned up the power, I got breakout... from the wrong end! It went FFFFFttt and set the PVC on fire until I pulled the plug. There we little flecks of carbon floating around the lab after that.
Incidentally, what IS the right way to ground in the MHz range?
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