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Registered Member #1739
Joined: Fri Oct 03 2008, 10:05AM
Location: Moscow, Russia
Posts: 261
errr, if your current waveform looks like that guy then either your coil has a realy weird bug or you've mixed the links :D [edited, sry for my dumb "humor"] Seriously, I found the actual pic anyway and it looks pretty expectable and not wrong at all.
As for 8 amps - most likely an interruptor issue. What bps and dc are you running your coil at? Also, are you using any remote controller? With some tough luck, a cable can induce ringing that your coil may accept as a control pulse. The cable has to be checked well, but even with that I still like to use a noise rejecting internal interruptor to work with the control strobes the coil receives just to make it bullet-proof.
Registered Member #1107
Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
LithiumLord wrote ...
errr, if your current waveform looks like that guy then either your coil has a realy weird bug or you've mixed the links :D [edited, sry for my dumb "humor"] Seriously, I found the actual pic anyway and it looks pretty expectable and not wrong at all.
As for 8 amps - most likely an interruptor issue. What bps and dc are you running your coil at? Also, are you using any remote controller? With some tough luck, a cable can induce ringing that your coil may accept as a control pulse. The cable has to be checked well, but even with that I still like to use a noise rejecting internal interruptor to work with the control strobes the coil receives just to make it bullet-proof.
Eh... HAHA i know i felt so embarassed when i saw what the link directed me to i started to laugh. Anyway, yea i dont think that there is anything wrong with the actual coil but in the interrupter itself. The interrupter is linked to the coil through a rg59 shielded bnc cable. When i scope the output through the interrupter through the cable i get very very small amounts of ringing. Nothing at all to be concerned about. The actual interrupter is a clone of Steve Wards interrupter "lemme check the link to make sure it doesent point to any dumb youtube vids " and i didn't modify anything. I have about 30vdc across the buss at the time and i will not power it any higher until i have this problem fixed to avoid any scilicon pyrotechnics
Registered Member #154
Joined: Sun Feb 12 2006, 04:28PM
Location: Westmidlands, UK
Posts: 260
teslacoolguy wrote ...
IT WORKS!!!! But there is a catch. It is running very unhappy and no matter how much tuning i do it draws 8 amps at just 30vdc input! I can only get 2.5" to a grounded object and the arcs are HOT.
That sounds ok to me.....30volts bus for 2.5 inch spark. since you mentioned that they were HOT and drawing 8 amps, what intterupter frequency and pulse width are you using? For test purposes i would start out at around 50hz and 50uS pulse width
Registered Member #1107
Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
I never really payed attention to the frequency output of the interrupter but today i put it on the frequency counter and the lowest setting is around 900hz that is sure not correct. I followed Steve Wards schematic carefully and i didn't substitute anything so now this has me really puzzled. Also the sparks don't sound like most drsstc's and they are rather muffled and dont have that really hi pitch sound like they should. This has got me completely puzzled.
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
Check the output on the scope. Remember before your problem with reversed feedback? You told me on IM that the frequency of oscillation was like 150khz, but your scope shots showed 500khz, which implied you had negative feedback (instead of positive). All signs point towards the interrupter commanding the wrong duty cycle, so simply look at the time interval between pulses on the scope and report back.
Registered Member #1381
Joined: Fri Mar 07 2008, 05:24PM
Location: Hungary
Posts: 74
Are you using DC coupling on the channel? The signal level keeps shifting as if it were in AC , that other wave form thing kinda looks like some triggering problem. (if it's random , or you should get another scope)
You should check with some other scope to be sure. (Or atleast try using the other channel , if its the same problem)
Registered Member #1739
Joined: Fri Oct 03 2008, 10:05AM
Location: Moscow, Russia
Posts: 261
Hehe, now I see! Could you post a single pic of the interruptor signal trace (preferably two pulses onscreen) along with the scope setup data? According to the spark appearence and your traces it feels like you are running your DRSSTC in a mode somewhat closer to an ISSTC one. Retime the interruptor - just google up a prog called "555 Timer PRO", it's shareware, but the free limited version has all the features you need (and misses all the features you don't lol) and use it to calculate proper timings.
Registered Member #1107
Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
Now the coil draws a a ton of current even when the secondary is not connected even with just 20v across the bus. The primary waveform is really crazy and i cannot get a scopeshot of it. I am starting to get really annoyed about why it is not working !!sad i tried using my frequency generator in place of a interrupter but it is still acting wierd.
Registered Member #639
Joined: Wed Apr 11 2007, 09:09PM
Location: The Netherlands, Herkenbosch
Posts: 512
Try checking the circuit with a scope when you feed a wave from your freq gen to the CT input. Btw never run a TC without a secondary coil or load in place.
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DRSSTC help.
" and i didn't modify anything. I have about 30vdc across the buss at the time and i will not power it any higher until i have this problem fixed to avoid any scilicon pyrotechnics 
that is sure not correct. I followed Steve Wards schematic carefully and i didn't substitute anything so now this has me really puzzled. Also the sparks don't sound like most drsstc's and they are rather muffled and dont have that really hi pitch sound like they should. This has got me completely puzzled.
