Pranab,
While the EVR DIY plans 2.0 do appear feasible to conservatively meet your
8' specification, (as far as I can tell from the "quick view" stating 12-14
foot spark length and full bridge with CM600HA-24A ? IGBTs, which others
have used to achieve such spark lengths), I hope you find the below as
useful as I do:
https://stevehv.4hv.org/ - Steve's site is very informative and well
documented. The two 6kW DRSSTCs I built for the Museum of Science
(operating daily since 2010 & 2013 respectively) largely follow his DRSSTC2
design, using a full-bridge with two CM300DY-24H modules, 588VDC bus, 1200A
current limit, and have achieved 10' spark length. Note his design achieved
10' at first light. Rather than a boost converter, I just used a voltage
doubler. His design guide and particularly the bypass capacitor between the
negative bus and strike rail (DRSSTC4) are really helpful.
https://kaizerpowerelectronics.dk/tesla-coils/sstc-design-guide/ - Mads
Barnkob's site is very comprehensive and immensely helpful
https://onetesla.com/tutorials/drsstc-bridge-design - Bailey Wang's
tutorials are instructive. Note this one on switch selection includes the
CM600HA-24A IGBTs in the EVR DIY 2.0 design, noting of them "The largest of
the readily available bricks, easily good for 3kA. Really needs 800V bus
voltage to shine, and bridge construction is a bitch due to their
single-switch construction." More importantly, it suggests supplemental
scaling guidelines to Freau's formula, instead correlating peak primary
current with spark length.
Best regards,
Daniel Davis
https://www.easternvoltageresearch.com/diy-tesla-coil-plans-2-0/ - EVR
plans you are considering
http://www.farnell.com/datasheets/1917044.pdf - datasheet for CM600HA-24A
IGBTs used in EVR DIY 2.0 plan
https://www.rlocman.ru/i/File/dat/Powerex/IGBTs_Arrays_Modules/CM300DY_24H.pdf
- used for 10' sparks (full-bridge, 2x of these modules, 588VDC bus
(voltage doubler with 208Vac), and 1200A current limit
https://stevehv.4hv.org/DRSSTC2.htm - 10' spark length at first light
https://stevehv.4hv.org/drsstc_design.htm - Steve Ward DRSSTC design guide
https://stevehv.4hv.org/DRSSTC4.htm - includes important info about putting
bypass cap between negative rail and strike rail/AC ground
https://stevehv.4hv.org/DR_plexi/general%20wiring%20scheme.pdf - bypass cap
from negative rail to strike rail/AC ground
https://onetesla.com/tutorials - Bailey Wang's DRSSTC tutorials
On Sun, Jul 18, 2021 at 12:03 AM Steve White <steve.white1@xxxxxxxxx> wrote:
> According to John Freau's empirical equation, 5 KW should be good for 10
> feet IF everything is optimally implemented. His empirical equation is:
>
> Length = 1.7 * sqrt(input power)
>
> where "length" is in inches and "input power" is in watts. This equation
> was designed for spark gap coils but it should be applicable to DRSSTCs
> also. I emphasize that this is for a very well-designed coil. Most people
> do not quite achieve the predicted length. My 6.5 KVA SGTC achieves a
> 9-foot streamer yet the Freau equation predicts 11 feet. I am not familiar
> with the EVR design. Another factor that helps is that DRSSTCs are 10% to
> 20% more efficient than a SGTC.
>
> Steve White
> Cedar Rapids, Iowa
>
> ----- Original Message -----
> From: "Chris Reeland" <chrisreeland@xxxxxxxxx>
> To: "Tesla Coil List" <tcml@xxxxxxxxxxxxxxx>
> Sent: Saturday, July 17, 2021 3:29:40 PM
> Subject: [TCML] Re: Schematic and Plans Needed to Build a Musical Tesla
> Coil
>
> Hi Pranab,
>
> I will admit I am not real familiar with these types of coils.
> And, so not familiar with the plans you are talking about.
>
> The power you have available is more than enough as far as I know.
>
> I would contact Daniel McCauley at EVR, to make sure these plans will work
> for expected 8ft output before a lot of wasted time and money.
>
> He should be able to help you get on the right path to this.
>
> Chris Reeland
> Ladd IL USA
>
> Sent from my Samsung Galaxy Tab® S
>
> On Sat, Jul 17, 2021, 10:23 AM Pranab Lodh <bumba007lodh@xxxxxxxxx> wrote:
>
> > Dear All,
> >
> > Hi, I am Pranab from India. I want to build a musical Tesla Coil for a
> > client, I have searched a lot but haven't found anything appropriate. So
> I
> > have decided to buy DIY Musical Tesla Coil Plans - Reference Design 2.0
> > from Eastern Voltage Research.
> >
> > But I don't know whether this plan will work for me or not.
> >
> > The maximum power I can give to the coil as input is (220V, 50 Hz) 5 KW
> and
> > the client's requirement is to generate 8 ft of arc from this.
> >
> > So I am requesting you all to please help me to make this coil.
> >
> > I will be grateful to you all.
> >
> > Yours Sincerely
> > Pranab Lodh.
> > _______________________________________________
> > Tesla mailing list -- tcml@xxxxxxxxxxxxxxx
> > To unsubscribe send an email to tcml-leave@xxxxxxxxxxxxxxx
> >
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