DIY Flapjack Coil Jig

[BEP]

@Z.Monkey

It looks like your secondary will counter itself - the top and bottom halves will have counter polarity.
Other than that your coil reminds me of what a 'Tesla Coil' should look like - secondaries above and below the primary.

Nice looking work!

BEP

[broli]

@broli

It looks like your secondary will counter itself - the top and bottom halves will have counter polarity.
Other than that your coil reminds me of what a 'Tesla Coil' should look like - secondaries above and below the primary.

Nice looking work!

BEP

I think you have the wrong guy  .

[BEP]

I think you have the wrong guy  .

I certainly did! Sorry.

[z.monkey]

The vertical center (red) coil is the primary...

It establishes the major axis of the magnetic field...

The planar coil (yellow) is the secondary...

It sits on the equatorial orbital plane of the magnetic field...

It would be difficult to apply paper to this transformer to look at the magnetic field.  I am thinking that I can dump some iron filings directly on to the coil, apply some direct current and some vibration and maybe get a idea of what the magnetic field really looks like.  It would be nice to have a magnetic flux camera, or something that would fluoresce the flux. This is the trouble with magnetism, we can't see it.  Transformer design would be a LOT easier if we could see magnetic flux....

[BEP]

Ah!
The yellow is the secondary.

Pancake coils are a bit unique in that polarity is radial. i.e. North in the center and South at the outer diameter.

If you pulse or alternate the current in the primary you should see this. I don't know how well it will perform.
If the primary current is unchanging then nothing should come out of the secondary unless you add a static electric source at a right angle to your magnetic (something for Lorentz to work on).