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Topics - jpb133

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1
Spark Gap Tesla Coils (SGTC) / Selecting Bleeder Resistors
« on: May 25, 2019, 06:13:18 PM »
I'm building a dual mot tesla coil with a capacitor bank made up of 7x7 2000v .15uf caps. There will be a total of less than 5000v across the bank, or about 715v per cap. If I were to add a 10m ohm bleeder resistor across each one, there would be .0715mA of current and would make about .05 watts of heat across each resistor, so I should be able to use 1/2 watt or 1 watt resistors. When looking for resistors, I found some with these voltage ratings:
  Maximum working voltage:350V; Maximum overload voltage:600V; Maximum pulse voltage:750V
My only question is, will 715v be too much for each resistor to handle? Or will it be fine since I'm well within the wattage rating?
I've seen people using 10m ohm 1/2 watt resistors in similar tesla coils, are they just plain old resistors or do they need to have an insanely high voltage rating? Thanks in advance for any help.

2
I'm working on a mmc bank for my dual mot tesla coil, is it absolutely necessary to add bleeder resistors if I can easily discharge the capacitor? The terminals are close enough together that I can easily put a metal rod across them with the help of a well insulated pole. And wouldn't they discharge across the secondary coil of the transformer anyway? Can I simply short out the ends of the capacitor bank or must I discharge each capacitor individually? Thanks in advance for any information.

3
Spark Gap Tesla Coils (SGTC) / Where to buy Tesla coil capacitors?
« on: May 07, 2019, 05:31:12 PM »
There used to be loads of cornell dubilier 942c capacitors and others ideal for tesla coils all over ebay, but sadly I see few to none now.

Where are people supposed to find good tesla coil capacitors?

I'm building a dual MOT coil with no doubler or ballast and need about 100nf. The only one on ebay that looked like it might work was this one:

https://www.ebay.com/itm/LARGE-0-1-uF-25-KVDC-Energy-Pulse-High-Voltage-Oil-Poly-Capacitor-Tesla-Coil/222390242989?hash=item33c77dcead:g:zSkAAOSw241YisCL

Does this seem like it would work? Any other suggestions?

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