Even More Mini Coils
From: Malcolm Watts[SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: Monday, June 23, 1997 11:52 PM
Subject: Even More Mini Coils
I decided to push the system (primary caps) a bit.
Firstly, I stuck a 3" sphere on each resonator to get the tuning
roughly equal and reduce the random corona and air streamers. The
spheres were attaching single-channel with a few peripheral streamers
at 5.5" on a regular basis. Then I removed the ground connection
altogether and just let them work one against the other. What? It
improved! Then I separated the spheres to a distance of 6" p -> p.
Whoops! Now spark breakout was intermittent but always in the desired
direction. I then opened the gap up until it was firing at 7kV (caps
are rated at 6000 PWV). I then turned the supply up to full power.
Now I am getting attachments consistently at 6" p -> p at a lower
break rate dictated by supply delivery capability.
I can possibly do better even at a lower break rate but higher
primary voltage still. Going to have to series-parallel a cap bank
because robust as they are, I want these micas to last. They are
The setup: 7.8nF (2x 3n9 caps in parallel)
| | ooo ooo
o------+---| |------ o o spheres o o
| | | | ooo ooo
DC Input | | | |
from o O O O
Flyback o Gap Lp O Ls1 O Ls2 O
Supply | O O O
| | O O
Robert, I think I just joined you in coiling heaven :)