Coils for ION ... still a bust somewhat

[garfield at pilgrimhouse.com]

On Sun, 31 May 1998 09:35:56 -0400, "Bruce Plecan" <nacelp at bright.net>
wrote:

>, when in fact that end of the secondary was tied
>>internally to the same terminal that the primary connects to for +BAT.
>>
>Now other than just being different was there a point for this??.  I 
>thought the common post for the primary, and sec. was the negative
>terminal of the coil.  Or did I misunderstand that...

Yeah, that's in fact by far the most common "common" heh, to tie both
primary and secondary up together to +BAT. Then the module/points just
connects the other side of the primary to GND to saturate the coil, and
then opens (disconnects B) that connection from GND. So-called "low side
driver".

The idea of tying one side of the secondary to +12 always surprises
people at first, but with 10s of kilovolts on the other end of the
secondary, it hardly matters whether it's standing off of gnd or a mere
12v. Really mox nix.

Gar