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Registered Member #1772
Joined: Tue Oct 21 2008, 05:23AM
Location: Athens, OH
Posts: 71
Recently, I've been working on making my coil more compact and mobile, and here's what I've come up with so far:
The orange caps are part of the RC filter, the brass balls are the safety gap, and the copper pipe fittings by the fan are the static gap. For right now, I'm just connecting my 1500V/25ma NST to the lugs on the resistor on the side close to the orange caps.
First of all, does anybody have any suggestions? I hope it doesn't look like just a mess of wires. Maybe I should re-size the pics.
Secondly: I've been testing out the spark gap (the copper pipe fittings) and have burnt the wood beneath it twice to the point where it was smoking and my smoke detectors were going off. The pipe fittings fit around some pieces of dowel rod (about .5 in long) that I screwed to the piece of wood they sit on. They're pretty snug so I can raise them up about a quarter inch and don't seem to have a problem but I still don't feel very confident with it. Can anybody suggest a simple alternative method for setting those up straight without the fire risk? Unfortunately, I only have some basic tools and material to work with: hammer, hack saw, drill, etc.
One more question: My MMC is just one string of 10x cde 940C30P15K-F (3000V/.15uF ea). I didn't buy the 942's because I only run my TC about once a month or so for only a few minutes at a time so I figured they wouldn't see much wear. However, I should be getting two 12000V/30ma NST's in the mail this week that I want to wire in parallel. If I use the same set of caps (minus two of them to get 24kV/0.019uF total), is there much risk of destroying them with the higher current and higher power? I'm going to set my coil up for this "Young Engineers and Scientists Day" at my university where there are going to be young kids checking it out (from a distance). Should I build a shield over the caps in case one blows up?
Sorry, this is such a long post. Thanks again for all your help!
Registered Member #1157
Joined: Thu Dec 06 2007, 12:11PM
Location: Houston, TX
Posts: 307
oucivileng wrote ...
Secondly: I've been testing out the spark gap (the copper pipe fittings) and have burnt the wood beneath it twice to the point where it was smoking and my smoke detectors were going off. The pipe fittings fit around some pieces of dowel rod (about .5 in long) that I screwed to the piece of wood they sit on. They're pretty snug so I can raise them up about a quarter inch and don't seem to have a problem but I still don't feel very confident with it. Can anybody suggest a simple alternative method for setting those up straight without the fire risk? Unfortunately, I only have some basic tools and material to work with: hammer, hack saw, drill, etc.
Id say mount them on a plastic (HDPE) cutting board with some nylon bolts to hold them up. That should eliminate the possibility of the wood underneath catching fire. If you have a spare piece of 6" PVC pipe, I'd say go with the RQ style and mount them so that the fan quenches through the pipe and focuses all the airflow at the gaps.
Wiring looks cool to me, we don't all have the OCD about the coil looking like a museum piece.
As for the caps, 10 should be enough, just so long as you don't hear them snapping while you are running the coil. It will sound like loud snaps or pops like blackcats going off.
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