DRSSTC Secondary form factor
colin heath, Mon Nov 12 2007, 07:50PMHi all,
I have taken delivery of a 1m length of plexi tube 150mm diameter. I usually go for a 5:1 ratio making 750mm.
I am wondering going for longer will really hurt performance? I am thinking the benefits of the topload being further from primary will outway the small coupling loss (coupling being so high anyway)
Aside from aesthetics can anyone think of another reason not to go for this?
I have attached a pic that gives an idea.
Cheers
Colin
Re: DRSSTC Secondary form factor
Marko, Mon Nov 12 2007, 08:58PM
Hey, your topload is an unshorted coil, so it's going to be just a part of secondary coil - really nothing to worry about
Regarding form factor, I don't see why not go for it - it will give you larger manageable spark.
Steve's big DRSSTC seemed to be just about that...
You may actually want to reduce the coupling much more later because of flashower, and it may actually be wise to leave some more initial free space between winding and the bottom of the form...
Nice to see big coils again in around
Marko, Mon Nov 12 2007, 08:58PM
am wondering going for longer will really hurt performance? I am thinking the benefits of the topload being further from primary will outway the small coupling loss (coupling being so high anyway)
Hey, your topload is an unshorted coil, so it's going to be just a part of secondary coil - really nothing to worry about
Regarding form factor, I don't see why not go for it - it will give you larger manageable spark.
Steve's big DRSSTC seemed to be just about that...
You may actually want to reduce the coupling much more later because of flashower, and it may actually be wise to leave some more initial free space between winding and the bottom of the form...
Nice to see big coils again in around
Re: DRSSTC Secondary form factor
colin heath, Mon Nov 12 2007, 09:36PM
Hi Marko,
The toroid is shorted at both ends together and inter turn also so will be a true finite element toroid.
Coupling is going to be fully adjustable on a pneumatic ram controlled platform so reducing or increasing on the fly will be no problem
Cheers
Colin
colin heath, Mon Nov 12 2007, 09:36PM
Hi Marko,
The toroid is shorted at both ends together and inter turn also so will be a true finite element toroid.
Coupling is going to be fully adjustable on a pneumatic ram controlled platform so reducing or increasing on the fly will be no problem
Cheers
Colin
Re: DRSSTC Secondary form factor
Steve Ward, Mon Nov 12 2007, 10:41PM
My big coil is ~1:5.5, so of course i dont see any problem with this
.
I still occasionally get the nasty spark that jumps across the entire surface of the coil... a bit too much voltage me thinks. I really dont think i would go past a 1:6 ratio though, since wider coils are really better.
Steve Ward, Mon Nov 12 2007, 10:41PM
My big coil is ~1:5.5, so of course i dont see any problem with this
.I still occasionally get the nasty spark that jumps across the entire surface of the coil... a bit too much voltage me thinks. I really dont think i would go past a 1:6 ratio though, since wider coils are really better.
Re: DRSSTC Secondary form factor
colin heath, Tue Nov 13 2007, 08:06PM
Hi Steve,
I will trim it down a bit then. I do like the look of 1:5 and seems i have been trying to build an attractive coil i think i will go for that.
I will be happy if i can drive it hard enough to get that flashover
Looking forward to throwing some power on this thing.
Cheers
Colin
colin heath, Tue Nov 13 2007, 08:06PM
Hi Steve,
I will trim it down a bit then. I do like the look of 1:5 and seems i have been trying to build an attractive coil i think i will go for that.
I will be happy if i can drive it hard enough to get that flashover
Looking forward to throwing some power on this thing.
Cheers
Colin
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