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Re: Question regarding PCB board in close proximity with Primary Coil (DRSSTC)

Original poster: "Jimmy Hynes" <jphynes@xxxxxxxxx>


Option 1 is clearly a shorted turn as well, it just has a conductive
center which shouldn't make much of a difference, since the current
flows along the outside (skin effect)

Option 3 doesn't look bad to me. Yes, it's a partial turn, but all the
voltage induced is common mode, so it doesn't 'know'. If anything, it
seems better than 4, since it's coupled to the ground plane better.

If you're really worried about noise, put a big filter on it. Leds are
DC, and low power, so filter design should be very noncritical.

On 5/7/06, Tesla list <tesla@xxxxxxxxxx> wrote:
Original poster: "Daniel McCauley" <dhmccauley@xxxxxxxxxxxxxxxxxxxxxxxxxx>

Here is an interesting problem I am currently facing with one of my
projects. Basically, i have a tesla coil with 6 primary polycarbonate
supports which will be illuminated via LEDs (from underneath the base
as shown in the attached image)

Now, i would ideally like to use a PCB board to mount the LEDs and
this PCB board would then screw directly underneath the base where
the LEDs would protrude through the base and up into the bottom of
the primary supports. This keeps everything nice, neat, and compaq
with out having six million wires all over the place.

However, the problem is that i am not quite sure how the board would
act in close proximity with the primary coil which is only about 2-3
inches above this PCB board.

Option 2 and 3 both seem to be the worse of the group since they will
couple with the primary like a shorted or partial turn, respectively.

Option 1 seems like a possible alternative, but i'm not sure how that
would work. And Option 4 with the flying leads may be the only feasible option.

Anyways, what are your thoughts on Option 1?

Any other thoughts or ideas you may have???

Again, my concern isn't how the PCB board would affect performance of
the coil but rather it is the concern of induced noise onto the PCB
board which would screw up the control voltage powering the LEDs.

Attached image shows application and possible options for PCB board