Secondary ground terminations
Subject: Secondary ground terminations
Date: Tue, 10 Jun 97 09:12:44 EDT
From: Gary Lau 10-Jun-1997 0908 <lau-at-hdecad.ENET.dec-dot-com>
Thanks to all who replied to my Pri/Sec spacing question.
I've just completed the winding of my secondary and have to deal
with terminating the ends before I can coat the coil. I have
read the R. Quick documents suggesting terminating the bottom of
the secondary with a flush-mounted copper plate just below the
bottom winding on the sec. tube, and attaching the earth ground
connection to this plate using a rubber band. While I can
appreciate the durability and low corona discharge qualities of
this approach, the integrity of the connection seems marginal
when compared with the efforts one should make in providing a low
impedance ground path.
I was planning on plugging the base of my sec tube with a 3/8-
1/2" disk of Plexiglass with a 1/4-20 threaded insert in the
center, and gluing a second 3/8" disk above this insert to
insulate and plug the insert hole. The insert would be used to
mount the secondary assy.
Would it be reasonable to use this insert as a ground connection,
running a thin copper strip radially outward on the base of the
lower disk from the insert to the bottom tail of the secondary?