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DRSSTC BEAST

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LAN_403

raff

Sun Nov 01 2009, 01:32PM

Registered Member #2315 Joined: Tue Aug 25 2009, 02:35AM
Location: Leyte, PH
Posts: 161

EDIT:

nevermind.. that was a silly Q.. I wasnt reading the FIRST POST...

sorry..

MRacerxdl

Sun Nov 01 2009, 02:34PM

Registered Member #989 Joined: Sat Sept 08 2007, 02:15AM
Location: SÃ£o Paulo, Brazil
Posts: 476

Looking at the driver, he doesnt look to use PLL with VCO . Its only an 74HC14 with antenna feedback

raff

Sun Nov 01 2009, 10:19PM

Registered Member #2315 Joined: Tue Aug 25 2009, 02:35AM
Location: Leyte, PH
Posts: 161

I was wondering HOW the calculation for primary L and C is calculated...

for example my secondary (including topload) is 200Khz(or something close to that).. so my primary would HAVE be 13Turns/5" Diameter with 10nF cap.. or 9Turns with 20nF... according to teslamap ...

same principle?

Mates

Sun Nov 01 2009, 11:55PM

Registered Member #1025 Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566

Hi Martin,
62nF sounds as too high value for a resonant cap in the setup you present on the pictures. I think you should explain how you came to that value...

Also there is the common misunderstanding we run into once upon a time. The double resonant mode as is understood by some of the members of the forum involves also the primary feedback. For you apparently, the double resonant mode means only an extra resonant cap in a classical SSTC setup. Hard to say who is right

BTW: Your coil is breathtaking!

Cheers Mates

Arcstarter

Mon Nov 02 2009, 02:00AM

Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253

Also there is the common misunderstanding we run into once upon a time. The double resonant mode as is understood by some of the members of the forum involves also the primary feedback. For you apparently, the double resonant mode means only an extra resonant cap in a classical SSTC setup. Hard to say who is right

Heh, well, it is a solid state tesla coil with a capacitor to cancel the inductive reactance... Like a cross between the two. You will always be in tune with the secondary, but that can change around, making the 'resonant cap' be less than resonant...

Also, 62nf sounds about right. In fact, Steve Ward used 75nf for one of his small drsstc's.

Z28Fistergod

Mon Nov 02 2009, 03:10AM

Registered Member #2040 Joined: Fri Mar 20 2009, 10:13PM
Location: Fairfax VA
Posts: 180

raff

Mon Nov 02 2009, 07:09AM

Registered Member #2315 Joined: Tue Aug 25 2009, 02:35AM
Location: Leyte, PH
Posts: 161

so.. how do we come up with a value for L and C? do you just select (sample) 10turns and an equiv capacitor value?

mmt

Mon Nov 02 2009, 04:17PM

Registered Member #2333 Joined: Thu Sept 03 2009, 03:04PM
Location: Slovakia
Posts: 80

wau i was never wonder about those complicated things you all are talking about, I just add a resonant cap to steve's design thats all, and it works great!

I have just measured my cap it has 63,8nF.
raff: everything for u want to know is here

all calculations for my cap are here:
TC - Tesla Coil

primary

coil dia: 12,5 cm
wire dia: 2 mm
#turns: 8
height: 3 cm
L: 11,4116170261326 ÂµH

sec

coil dia: 11 cm
coil height: 23 cm
wire dia: 0,2 mm
Toroid: 8,25 pF
#turns: 1092,5
L: 50,8572346041159 mH
F: 188,762356239045 kHz
C: 5,72837677165354 pF

Toroid

outer dia: 19,5 cm
vercical dia of ring: 4 cm
C: 8,25378982923742 pF

LC circuit

C: 62,3 nF
L: 11,411 ÂµH
F: 188,761863274766 kHz

matching cap to freqenci

L primary: 11,411 ÂµH
F sec: 188,76 kHz
C: 62,3012299490451 nF

Z28Fistergod

Tue Nov 03 2009, 02:51AM

Registered Member #2040 Joined: Fri Mar 20 2009, 10:13PM
Location: Fairfax VA
Posts: 180

mmt wrote ...

wau i was never wonder about those complicated things you all are talking about, I just add a resonant cap to steve's design thats all, and it works great!

I have just measured my cap it has 63,8nF.

Hah, that's funny. So does it have an oscillator or is it solely driven by feedback?

teravolt

Tue Nov 03 2009, 04:21AM

Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111

MMT very nice coil. it seems that antena feed back works well for your tesla. this scematic is one of the moast primitive circuits that Steve Ward made and can eat fets with out proper tuning. Did you have any problems building it? have you seen the other shematics that have feedback and interuptor sycronization. I think the reson that your circuit works so well is the fact that you have strong cupling maby .3. have you actualy mesured primary and secondary frequency seperatly.

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