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Schumann Resonator Coil
Schumann Resonator Coil
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Old 8th December 2013, 09:25 PM   #1
cncdragon is offline cncdragon  Ireland
diyAudio Member
Join Date: Nov 2013
Default Schumann Resonator Coil

Hi all, I've been looking at the various threads on here about building a Schumann Resonator http://www.diyaudio.com/forums/every...resonator.html and Schumann Resonator I would like to build one of these and was just wondering if someone could advise me in regard to the PCB etched coil. On looking here and on the net there appear to be many different designs, all using a bifilar coil, some square and others angled eg. octagon shape. My question is basically, what is likely to be the best size and shape coil to be most effective, or is there really much difference between them ? Also how would one calculate the correct trace width, distance and turns to have an effective coil ? Finally, could someone advise as to the best method to create a bifilar coil in EagleCad. I'm familiar with the print-spiral ULP but perhaps there is a ULP that can handle a bifiliar coil ? Many thanks to any who can advise here.
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Old 8th December 2013, 10:12 PM   #2
DUG is offline DUG  Canada
diyAudio Member
Join Date: Jan 2003
Location: mississauga ontario canada
Make one coil on the top layer and the electrostatic shield on the bottom.

Then make another one the same.

Insulate the coil area except for the connector pins.

Join at the 7 pin connector top face to top face.

Center tap is pin 1 and the two feeds are pins 2 and 3.

The shield is 6 and 7.

Works very well.

I could tell you where I've used this, but...

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Old 9th December 2013, 04:02 PM   #3
cncdragon is offline cncdragon  Ireland
diyAudio Member
Join Date: Nov 2013
Thanks Dug ! Much appreciated. So is this the best shape for radiating in the 7.8hz region or are they all fairly similar ? Also what would be the best dimensions in terms of trace width and distance ? Thanks again.
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