User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:31.0) Gecko/20100101 Thunderbird/31.7.0
On 8/22/15 2:10 PM, Matthew Sweeney wrote:
Now I have three perfect 15,000v 250ma NST's just sitting waiting for a
purpose - so I think it's time to start planning a new build. I have never
built a proper solid state coil and am considering this option. But a
traditional rotary spark-cap coil with high-voltage capacitors would be
much less effort. The secondary will be 5 Feet and using enameled magnet
wire.
I'm looking for good sources of (cheap) high voltage capacitors and much
info on recent developments in the field.
The spark gap coil state of the art for smaller coils (<10s of kVA)
would probably be the MMC (multi mini capacitor): paralleled strings of
polypropylene dielectric capacitors designed for high di/dt. A string
of 10 2kV, 0.15 uF caps gives you a nice 15nF, 20kV capacitor which is
tough and will set you back about $60.
CHeck out the Cornell Dubilier CDE 942C20P15K, for instance..
You can do other voltages and capacitances to customize.
The price drops pretty quick in larger quantities.
I especially am interested in
inductor usage to prevent spikes back to the NST. Also I need some advice
on secondary wiring cable is there a preferred variety for recent coils?
Ill use copper tubing for primary. I may also build my own rolled
capacitors but I'm thinking obtaining newer HV caps in a bank may actually
be cheaper.
Rolled caps have pretty much gone away since the availability of the
snubber PP caps like the 942.
The other alternative for bigger coils is surplus caps from Maxwell Labs
which turn up occasionally, or similar caps from lasers and radars from
other countries.