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SGTC mathematics help

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LAN_403

coldcity

Mon Mar 31 2008, 01:35AM

Registered Member #1406 Joined: Thu Mar 20 2008, 12:12PM
Location: Deepest darkest Wales, UK
Posts: 27

(EDIT: this wasn't helpful, I misread OP's requirements.)

watchingthenight

Mon Mar 31 2008, 01:49AM

Registered Member #904 Joined: Mon Jul 16 2007, 03:15AM
Location:
Posts: 7

@Ultra7 Alright I understand what you mean

for the primary does it matter if you use a flat spiral layout or helical layout? I recognize that you would use thicker wire for the primary for current flow but I'm unsure as the ratio

bob golding

Mon Mar 31 2008, 09:44PM

Registered Member #1084 Joined: Mon Oct 29 2007, 08:58PM
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Posts: 28

flat spiral about 10 turns of 1/4 inch copper brake pipe. you could use something thicker but it will be hard to wind. when you buy it don't unwind it but tease it into shape around your primary supports.

watchingthenight

Tue Apr 01 2008, 12:13AM

Registered Member #904 Joined: Mon Jul 16 2007, 03:15AM
Location:
Posts: 7

are there any good pcb programs for the pcb design

Ultra7

Tue Apr 01 2008, 01:18AM

Registered Member #1157 Joined: Thu Dec 06 2007, 12:11PM
Location: Houston, TX
Posts: 307

I didn't really use any PCB with my SGTC.
I used a perfboard for the MMC, but that was it.

But Eagle is quite good.

Then there is ExpressPCB where you can get a schematic editor, PCB layout software, and they even manufacture the boards for you.
the software is free, and they are reasonable on the boards.

watchingthenight

Tue Apr 01 2008, 02:39AM

Registered Member #904 Joined: Mon Jul 16 2007, 03:15AM
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Posts: 7

These are the results I have found, if anyone has any opinions or can explain what 1/4 wave data for secondary is, what aspect ration for primary coil is I would like that.
Finalized Math:

AC Main line freq: 60 hz
Primary Transformer
Power: 450 watts
Current: 30mA
Voltage: 15kv
Impedance: .5 Mohms
2ndry Coil
Diameter: 3.7in
Height: 16.567in
Aspect Ratio: 4.14
AWG: 26
TPI: 57.91
Number of Turns: 959.4
Wire Length: 1004.7 ft
Inductance: 20101.684 uH
Self Resonance: 406.83 Khz
Distributor Cap: 7.46 pF
Capacity for 1/4 wave: 21.04 pF
1/4 wave resonance: 244.7414 Khz
Top Terminal Capacity: 13.59 pF
Primary Coil
Inductance: 81.2 uH
Turns: 13.8
Diameter: 12 in
Width between turns: 3.13
Ratio: .2761

Austin

Tue Apr 01 2008, 03:35AM

Registered Member #1169 Joined: Wed Dec 12 2007, 09:16AM
Location: Portland OR
Posts: 251

Goldsphere wrote ...

30mA....oh
I was gonna say, i've never heard of a 200mA NST before.

You are probably better off with a 3-4 inch diameter secondary
with a 5 or 6 : 1 winding ratio.
That ebay secondary looks nice but the person obviously doesn't know much about
Tesla coils, I'd suggest wind your own.

do not buy from swordandtreasure unless you plan on shooting yourself in the foot!

Ultra7

Tue Apr 01 2008, 02:38PM

Registered Member #1157 Joined: Thu Dec 06 2007, 12:11PM
Location: Houston, TX
Posts: 307

Check out Dan's "How to design a TC" Paper here.

Here is what I come up with for your NST.
For the MMC I assumed the CDE942C20P15K's were the cap.
15 of those in series will give you 10nF of capacitance for an ARSG.
With this setup, you will be in tune somewhere between turn 9 and 11
20 of them will give you 7.5 for a static spark gap.
With this setup, you will be in tune somewhere between turn 10 and 12
I also assumed a 3X12 toroid.

---------- Power Supply ----------
NST V Out 15 kV
NST I Out 30 mA
NST Input V 120 V
NST Input F 60 Hz
NST VA 450.0
NST Watts 462.7 W
NST Impedance 500 Kohms
Max Arc Length 36.6 in
NST PFC Cap 82.9 uF

---------- Primary Capacitor ----------
Your Cap 10 nF
Resonate Cap 5.3 nF
LTR Static Cap 7.4 nF
LTR Sync Cap 10.1 nF

---------- Secondary Coil ----------
Single build magnet wire
26 AWG
Wire Length 967.2 ft
Wire Weight 0.74 lbs
Wire Resistance 39.7 ohms
Coil Height 17 in
Coil Diameter 3.7 in
Coil H/W Ratio 4.6 : 1
Coil Turns 999.0
Inductance 15.55 mH
Capacitance 6.87 pF

---------- Top Load ----------
Overall Diameter (1) 12 in
Ring Diameter (1) 3 in
Overall Diameter (2) unknown
Ring Diameter (2) unknown
Sphere Diameter unknown
Top Load Adjustment 80 %
Top Load Capacitance 12.01 pF

---------- Top Load + Secondary ----------
Resonate F 293.68 kHz

---------- Primary ----------
Wire Diameter .25 in
Wire Spacing .25 in
Hole Diameter 5 in
Coil Angle 0 degrees
Coil Adjust 85 %

Needed primary inductance with:
Your Cap 18.45 uH
Resonate Cap 34.78 uH
LTR Static Cap 24.85 uH
LTR Sync Cap 18.31 uH

All these calculations were done using Tesla Map.

H~Tank~V

Tue Apr 01 2008, 03:04PM

Registered Member #1253 Joined: Tue Jan 22 2008, 02:06PM
Location:
Posts: 39

Are there any websites that have the actual formulas listed? As in not a Java app or anything?

Thanks

Ultra7

Tue Apr 01 2008, 10:05PM

Registered Member #1157 Joined: Thu Dec 06 2007, 12:11PM
Location: Houston, TX
Posts: 307

Google is your friend.

But here, the equations and the java calculators all in one.

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