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On 8/18/21 10:41 AM, daniel_kline7657@xxxxxxxxx wrote:
Hello All,I have a question about an unexpected effect I got from a Tesla coil.
The other day, I set up a couple of "identical" coils in a twin configuration, where the spark gap and cap bank were between the two coils and their secondaries were grounded to each other.
I'm trying to visualize this - you have a capacitor, spark gap, and two
primaries all in series? Or just one primary?
I didn't use any other ground except the house ground on the neon
transformer. The secondaries were only grounded to each other. I did
that to see if I could set up two coils and not have to use an rf
ground. That configuration worked well, no problems.
Are the secondaries arranged "parallel" or "end-to-end" with each other
Then, I wondered if I could set up one of the coils normally in a single-coil configuration, but still use the other coil's secondary as ground for the coil I wanted to run. If that worked, that would allow me to run a single coil without a dedicated rf ground.
OK, so you had cap-gap-primary on ONE coil, and the other is open primary?
When I tried to run the single coil that way, I got nothing from that coil, but I got normal arcing out of the coil I was using as ground! I don't understand this. The primary of that coil was completely disconnected and wasn't in the circuit all. How could I get arcs out of the coil I was using as ground? Because it wasn't really ground and that's where all the energy was going? Why didn't I get anything out of the single-coil?
There's always a ground, sometimes where you least expect it. If nothing
else the "other coil" with the disconnected primary is serving as a
ground, as is the wire between the two.
If you had a suitable tool to measure it, you'd probably see a voltage
on the disconnected primary. The two secondaries have approximately the
same resonant frequency, they're in proximity, so energy from one will
couple to the other.
Any insights will be appreciated.Thanks,Dan K.
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