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Forums
4hv.org :: Forums :: Tesla Coils
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tesla coil powersupply

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loveHV
Tue Mar 31 2009, 07:35PM
loveHV Registered Member #1854 Joined: Wed Dec 10 2008, 06:09PM
Location: West-Flanders Belgium
Posts: 88
 		ok i'm aiming for 1M sparks, don't know if it is possible with the secondary coil i have. (50cm long 10cm diameter)

i've went to the local recycling center and they don't have any oil ignition transformers left

so im gonna try making a 1000W Dual MOT power supply, it should be enough to ballast it with a 1kW halogen bulb and then use 4000VAC

also why do they sometimes switch the MOC in parallel with the secundary of the MOT ? do you get more power then ?

4kVAC should be enough for a synchronous rotary sparkgap.

thanks for your help ;)
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MRacerxdl
Tue Mar 31 2009, 10:47PM
MRacerxdl Registered Member #989 Joined: Sat Sept 08 2007, 02:15AM
Location: São Paulo, Brazil
Posts: 476
 		Its not impossible to get 1M sparks with that secondary, as I know Alexandre made it with a secondary of 60cm (I dont know if its really 60cm)

Look:
Link2

4 MOT Power supply
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Alexandre
Tue Mar 31 2009, 10:55PM
Alexandre Registered Member #1228 Joined: Tue Jan 15 2008, 01:08AM
Location: Curitiba, Brazil
Posts: 162
 		correction:

That I used a secondary assembly of 40cm length tongue
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loveHV
Wed Apr 01 2009, 08:36AM
loveHV Registered Member #1854 Joined: Wed Dec 10 2008, 06:09PM
Location: West-Flanders Belgium
Posts: 88
 		Damn what a nice TC but doesn't your secondary get hot ?

how much power are you inputting in that coil ?

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Alexandre
Wed Apr 01 2009, 05:06PM
Alexandre Registered Member #1228 Joined: Tue Jan 15 2008, 01:08AM
Location: Curitiba, Brazil
Posts: 162
 		My secondary not heats, the input power is my QUAD-MOT power supply, limited input power about 4Kw...
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loveHV
Thu Apr 02 2009, 03:40PM
loveHV Registered Member #1854 Joined: Wed Dec 10 2008, 06:09PM
Location: West-Flanders Belgium
Posts: 88
 		thats nice, so much power without and the secondary doesn't heat.

i've got 2 microwave ovens

so i can make a duo MOT stack but i don't have a third MOT so are there any other ways to ballast it ?

is placing a MOC in parallel with the MOT secondary a ballast ?

placing a 30uF power correcting factor in parallel with the MOT primary is that also a ballast ?
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Alexandre
Thu Apr 02 2009, 05:11PM
Alexandre Registered Member #1228 Joined: Tue Jan 15 2008, 01:08AM
Location: Curitiba, Brazil
Posts: 162
 		I always used a heatsink in water connected in series with the primary Mots, is practical and works well as a high-power resistor ...

MOC's are also Ballast, but never used the ...
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loveHV
Thu Apr 02 2009, 06:18PM
loveHV Registered Member #1854 Joined: Wed Dec 10 2008, 06:09PM
Location: West-Flanders Belgium
Posts: 88
 		heatsink in water with water do you mean pure H2O because in normal tap water i think the resistance would be close to zero.

and how do you balast your MOT with a MOC, youre MOC in series with your secondary ? i saw it on some site don't know if it works.

on another site they say if you put a 30uF capacitor in parallel with your primary youre 16A breaker wil survive

i don't wan't any blown fuses because my parent's don't know hell of elektricity, so they think a blown fuse is disaster and panic etc...

also we don't have selectivity if one breaker trips the main breaker trips and the whole house turns black.
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MRacerxdl
Thu Apr 02 2009, 11:14PM
MRacerxdl Registered Member #989 Joined: Sat Sept 08 2007, 02:15AM
Location: São Paulo, Brazil
Posts: 476
 		In parallel it doesnt limits the current, only delays the waveform. a Series cap will limit the current...

About the resistence, its Alexandre uses a shower coil (that used for get hot water) in series with the primary of mot, and its imersed on common water... The resistance of the coil wont change much, because the resistance of the water is MUCH higher than the coil...
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Dr. Dark Current
Fri Apr 03 2009, 06:09PM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
 		The capacitor in series can correct the factor of an inductive load, which loaded MOTs are.
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