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Registered Member #87
Joined: Thu Feb 09 2006, 01:36PM
Location: San Jose
Posts: 191
Most have deemed spark gaps under 5kv unreliable and dificult to make/tune. How might I go about making a spark gap for 1kv? I'm figuring tungsten for the faces, so it dosen't clog, but what improvements could be made?
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
Terry Fritz was using a distance of 4mils (.004") for a 600V gap. between 2 copper 3/4" pipe pieces. Now if his figures are right for breakdown, I found that if you space the two out to 6mils you could get 1KV breakdown. Now I don't know how accurate this is because I haven't looked at the charge density and breakdown of this just yet, but if you have a HiPot tester or the like, you could find this out to be true/false rather quickly.
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
You might look into getting some of the little devices that are sometimes seen across a power input or whatever. Not the mov ones, but the pieces of ceramic (these... Even if you don't use them, their construction might give you some clues on good low voltage spark gap design.
Could you use a string of neon bulbs or something work? What is the power level of the coil you are running at?
Registered Member #87
Joined: Thu Feb 09 2006, 01:36PM
Location: San Jose
Posts: 191
Hmm, rotary sounds interesting. I don't want to go solid state, and those gas arester tubes look like they would heat up pretty quick. It's 1kv 30ma. How would I go about finding the proper speed/bps?
Registered Member #79
Joined: Thu Feb 09 2006, 11:35AM
Location: Arkansas
Posts: 673
You make the roto-gap speed variable
Naw, IIRC, you use I=C(V/t)
I is in amps,C in farads,t in seconds.
C is the capacitor bank I assume you're filling. Solve for "t" to find the period, and invert (divide 1 by the number you get) to find the frequency in Hz.
Then, to find the rpm of the motor, you take the frequency and multiply by 60. This will give you beats per minute which will be the RPM of the rotor with one electrode. Divide this number by the number of electodes on the rotor and you will get the needed RPM.
Or, if you need the whatever to run at a certain frequency, work backwards to find the needed capacitance.
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1kv Spark Gap/Tesla Coil
