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Registered Member #1643
Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039
Please note, only 12V 400MA MILIAMPS (sucks) power supply!
Materials Used: Transformer 1 - Lionel Train Transformer (HO-Scale) Transformer 2 - Car Ignition Coil Switching------ - MOSFET IRSP1280 (until I install the new 2N3055) Power 555----- - 9V battery Ladder Material - 2 Vault soda cans, Cardboard (tilt), CD case (no reason.. desk is glass anyways) Filter Capacitor - Photoflash 330V 140uf
Video! I'm sorry for the start. When you first start it, it's out of tune. Once dimmed, and re-loaded to the same tune, it works fine. (no middle helper wire)
Please note this is a mini test. I'm hoping to get a BETTER power supply so i can do a Large ladder :) Beginner here xD
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Why change the mosfet out with a crappy transistor? That mosfet you have is pretty powerful, MUCH more so than a 2n3055. Also, mosfets heat less than that transistor i am sure, and the 2n3055 probably blows more often.
Registered Member #1643
Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039
Is true but with my supply, nothing gets warm. not even the 2N3055. My can ladder now is like 3mm to 6mm gap comparing to what it use to be. For no reason i added a home-made inductor (many layers on a 4X1 inch PVC pipe) and it just smooths the arcs.
Registered Member #1806
Joined: Sun Nov 09 2008, 04:58AM
Location: USA
Posts: 136
Where did you put the inductor?.. In the HV output? I know that sometimes inductors are used with arc welders to produce some desirable results related to the arc.
Registered Member #1936
Joined: Sun Jan 25 2009, 11:34AM
Location: USA
Posts: 17
Your home-made inductor is probably just doing what an inductor does, let the DC pass but the AC is held back. From your other posts you seem to have realized that a rectifier is better. What kind of frequencies are you driving your coil at, and its it square-wave or snubbed?
Registered Member #1643
Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039
I'm just doing your average 555 driven circuit. I cant guarantee you on the frequency, but I know my pots are set near minimum, so with a calculator it might be around maybe 1.6 Kilohertz. guessing that the resistors are around 3 Kohms and a 0.1 uf cap on pin 2 to ground.
As for the pre-made coil, I just took 1 inch diameter PVC, 4 inches long, and coiled the whole thing with 24 gauge magnet wire. I noticed when I arch it from the coil to a piece of metal, after 20 seconds it was HOT to the touch. The coil is being run from the HV---Coil--Ark--Ground
(The hot metal occurred when I put a magnet in the middle of the homebrew induction coil.
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Jacobs Ladder start..
