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Topics - Bradselph

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1
Spark Gap Tesla Coils (SGTC) / 6" Coil Update now 72" and better lighting
« on: September 23, 2020, 09:03:56 AM »
6.6 Secondary Coil 24AWG Wire 28" with a 7"x23" Topload
58nf beer bottle capacitors with a 11 turn 1/4" copper tubing primary coil. the spark gap is a harbor freight special grinder with a 8" disc cutout with 8 1/4" brass bolts speed varied by variac 110v input seems to be the sweet spot

Power supply is made of 4 1kw 120v Microwave Transformers in banks of 2 for 240v input with 4800v out and mid point grounded then parrelled each to double the current to about 1.8amps at 4800v
then half wave multiplied to 9,600v. and a 5th 1kw microwave core with primary removed only secondary remains to be used as a charging choke to save the diode bank from kickback and also give the capacitor a flyback charging effect to 19kv there is no smoothing capacitor so its 120hz pulsed DC

so far longest measured strike has been 72" 

Hopefully this is a better amount of lighting for you guys.

I updated my grinder spark gap and have yet to enclose it for safety but I took that risk as I have with running this thing period.



2
Spark Gap Tesla Coils (SGTC) / my 4" coil turned to a 6" at 68"+ arcs
« on: July 27, 2020, 08:23:52 PM »
6.6" OD PVC form Winding 28" of #24AWG Magnet Wire Primary is 0.25 Copper tubing 11 turns
3 Microwave transformers to 68nf bottle caps 7" x 24" topload overall height 60"  targets on the side are about 65" away from center of topload

have 3 12kv 60ma franceformer transformers for this coil but performance was disappointing compared to the brute power of the microwaves

not much changed from the 4" coil besides the increase in bottle caps and how i setup the coil on top of the bottles 70 total in a 7x10 layout.

anything i didn't mention just ask


3
Transformer (Iron Core) / wire wound power resistors
« on: May 04, 2020, 01:23:32 AM »
after ordering my neon transformers i started shopping around for a proper protection circuit for them and have had one question arise and it comes to the power resistors used in the terry filter

seems the aluminum cased ones are everywhere yet the the long tube type ones are not.

would there be any reason to choose one over the other?

i thought about a series connection of say 4 25watt 250ohm aluminum housed resistor to equal 1kohm and it extend the length to help with possibility of a flash over.

does that sound plausible?

4
Spark Gap Tesla Coils (SGTC) / My 4.25" coil so far
« on: May 01, 2020, 08:38:38 PM »
figured id share what i been wrecking havoc with for the last 6+ months  ;D :o 8)

47" strike to grounded target without breakout point



its a 4.25" secondary wound with #22 awg wire 24" winding had enough wire for a 6" form but i wasn't sure about what material to use and until this week this project has only cost the wire and a harbor freight grinder on sale for $9.99  ;D its been hit by a streamer and still kicking

but the money spending as just got serious as Ive purchased 3 x 12kv 60ma NSTs looking for a 4th one still and working on trying to move away from the bottle caps but these things are just ridiculously bullet proof so far Ive only cracked 1 and it was caused by a rogue wire creating a hot spot

Ive had a lot of trial and error with just about every part possible

so far Ive tried too many different type of spark gaps and only 1 has impressed me and actually survived my abuse and that has been the angle grinder its even exploded from a brass electrode deciding it wanted to leave at over 200mph luckily i had enclosed the rotor with 1/2" MDF board so when things went south the wood did its job and stopped deadly projectiles at the cost of itself

Ive also been working on a synchronous motor with a 11" disc and i finally got it to impress me enough to start improving it and get it to actually be "synchronous" since i rushed assembly on it it surges too much but i can get it to lock on by pulsing the power switch for it a couple times so its a lot quieter than the angle grinder and until i tweaked it a little bit i wasn't impressed with it at all almost tossed it until it randomly got in time i guess and started almost matching the spark length of the grinder and it peaked my interest enough that I'm gonna rebuild it the right way and not rush it

my biggest gain in spark length was when i decided to add add 4 more flying electrodes to the grinder for a total of 8 and a large 3/8" aluminum diamond plate under the coil to act as a counterpoise to see if it would help with grounding since the sandy soil is most likely not the best even though i soak the area near the ground rod about 30 minutes before a run

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