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Re: [TCML] DC Resonant Coil Questions

Hi Jeremy,

Sorry that you couldn't make it to Roger's Teslathon, as I was in the same boat as you as far as being able to make it there today. Since I happened to be in the Cincinnati area last weekend, I did get a change to visit Roger and get the abbreviated grand tour of his HV "pole barn" laboratory this past Saturday, August 6, though.

Roger's big coil is a DC resonant driven one and is powered by a pole pig. I also have some 16 years of empirical experience with pole pig driven ARSG Tesla coils, so maybe I can at least take an educated guess addressing some of your questions regarding such subject matter.

David Rieben

----- Original Message ----- From: "Jeremy Gassmann" <jeremyee78@xxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Friday, August 12, 2016 7:40 PM
Subject: Re: [TCML] DC Resonant Coil Questions

Hey guys,
I am definitely bummed that I couldn't make it to Roger's thon this year
and meet some new people. Hope you all had a great time and if there are
pictures compiled I would love to see them!

The reason for this message is because I am interested in building a
larger, pig driven coil and wanted to know if there is a good pole pig
tutorial out there. I currently have a 2 kW NST driven coil using an RSG. I
had a special 220 V, 50 A service outlet put in for just this purpose. Any
good resources that you can point me to would be most appreciated! Thanks a

Jeremy Gassmann
On Fri, Aug 12, 2016 at 3:43 PM David Rieben <drieben@xxxxxxx> wrote:

Hi Don,

Yes, I am aware that the utility primary line power factor capacitors do
indeed have internal bleeder resistors to bleed off the potentially lethal
charge that they would retain when removed from the live primary line.
However, this would have little to any effect upon my system when she's

Thanks for the heads-up, though,

----- Original Message -----
From: "Donald Murray" <don@xxxxxxxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Thursday, August 11, 2016 5:33 PM
Subject: Re: [TCML] DC Resonant Coil Questions

> David,
> I haven't posted in a long time, but I still read the list. I wanted to
> let you know that your power line capacitor is going to have an > internal
> bleed down resistor .
> Don Murray
> On 8/10/2016 5:45 AM, David Rieben wrote:
>> Hi all,
>> I (along with my daughter and her husband) had a chance to visit Roger
>> Smith (in Ohio) and get the personalized grand tour of his nice sized
>> pole barn high voltage lab this past Saturday, August 6. Of course, >> the >> highlight of the visit was his huge, pole pig powered DC resonant >> Tesla
>> coil! Of course looking at Roger's DC res setup got the wheels to
>> in my head about how I could possibly convert my Green Monster to run >> DC
>> res instead of asynch with raw and unfiltered AC strait from my pole
>> My "junkbox" collection of parts has rendered enough for me to throw
>> together a DC resonant setup without spending a fortune on new stuff,
>> with numerous HV rectifier, a storage cap and a 5 H choke. I had a
>> of HV diodes pulled from x-ray transformers, including (8) of those 6"
>> long x 5/8" dia. cylindrical, fuse styled ones, as opposed to the more
>> common diode "sticks". I am using all 8 of these fused styled diodes >> for >> the FWB for the raw AC output from my 14.4 kV pole transformer, as >> this
>> type of x-ray tranny diode seems more rob8ust than their stick style
>> counterparts. With their 100 kVp+ rating, there should be plenty of
>> overhead as far as potential goes, and I have paralleled 2 at each of
>> (4) diode positions of the FWB rectifier to beef up the current >> rating.
>> I am currently using (8) paralleled of the more typical diode "sticks"
>> from an x-ray transformer for the D-Q-ing diodes between the choke and
>> the Tesla coil circuit's input and they still tend to warm up pretty
>> quickly in inital power up of the circuit, where the DC output is >> simply
>> shorted through the 5 H inductive choke to look for the visible spark.
>> course, with their 150 kVp rating, operational circuit voltage levels
>> not likely to be an issue, but current certainly can be! I figure that
>> the .1 uFd tank capacitor of my Tesla coil circuit, firing at ~350 BPS
>> will also load the output of my DC res in a similar fashion, but
>> hopefully to a somewhat less extent that dead shorting the output of >> the
>> DC res circuit through the 5 H choke.
>> I have a 5 Henry, 1.25 amp DC rated choke that was originally used for
>> the output of a 2200 volt plate transformer that I was going to use >> for
>> the choke. I do have some concerns as to its insulational standoff
>> integrity for the  ~15 kV voltage levels that my circuit will employ,
>> it seems to hold up ok in inital full potential testing of the circuit
>> running my pole pig all the way up to 16.8 kV by imputting 280 volts
>> its primary.
>> I am using a utility primary line power factor capacitor for the >> storage
>> cap that is rated for 7960 line voltage, 150 KVAR, at 60 hz. Its
>> capacitance is about 6.5 uFd. These caps seems nearly bullet proof, >> even
>> at DC voltages of several times their AC line voltage rating and this
>> is also rated at 95 kV biL (basic impulse level), so I feel as though
>> this capacitor will serve my purpose.
>> Anywho, I have slapped all of the above mentioned components on a 15 x
>> polyethylene cutting board - ($9 @ Sam's Club - and besides picking up
>> some extra 1/4" bolts and nut hardware, that's all that I have spent >> out >> of pocket upon this endeavor so far), - tested them at the full >> voltage
>> from one of my spare 14.4 kV pole pigs and I have reviewed Richie
>> Burnett's website on DC resonant circuits for driving Tesla coils and >> my
>> setup seems to be at least a start in the right direction. Of course,
>> real test will be when I actually try firing my coil through the newly
>> assmbled DC res. circuit.
>> Any input (as to any possible fatal flaws in my design) from you more
>> experienced DC res coilers would be most appreciated. ;^)
>> Thanks,
>> David
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