stacked primary

• To: tesla-at-pupman-dot-com
• Subject: stacked primary
• From: bob golding <yubba-at-clara-dot-net> (by way of Terry Fritz <twf-at-verinet-dot-com>)
• Date: Tue, 09 Feb 1999 22:17:21 -0700
• Approved: twf-at-verinet-dot-com

hi all,
	I have been playing around with the  stacked primary idea and have some
figures to throw about for those that are interested. I started with 12
turns on each coil with a total of 45 uh on each one. I then laid one of
the primarys on top of the other with the turns opposing each other ,this
made the total inductance 115 uH. I then turned the top coil over so that
it is like a slice though the centre of the bottom coil, ie they are mirror
images of each other. the minimum spacing between the two coils is 11/8"(32
MM) this results in a inductance of 30 uH. I then added 1 1/2"(38) of
spacing . This brought the inductance up to 45uH. I then checked how many
turns this equated to and found it worked out at 3 turns. If my maths is
correct with a 0.01 cap this should give a tuning range of about 50 kHz. A
useful range of tuning for 1.1/2" of movement. I don't know what to do
about finding the best position for coupling, and of course it might all
change when it is in the tank circuit rather than with 9 volts at 1 kc's
from my bridge. Any feedback most welcome. hope this makes sense. 

regards 
bob golding

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