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1
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: First DRSSTC SKM100
« Last post by davekni on Today at 05:58:27 AM »
Quote
So I wanted to ask what is usually better? Running at the upper pole or the lower pole?
QCW coils usually run at upper pole frequency.  Normal DRSSTCs are a bit more complex to describe.  Upper and lower pole frequencies describe steady state.  For short enable pulses, DRSSTCs don't reach steady state.  Currents are amplitude-modulated as energy sloshes back and forth between primary and secondary, a mix of upper and lower pole frequencies.   For long on times (typically for higher impedance coils), operation will settle to one pole.  Though that pole can change as arc loading changes secondary frequency.  Once secondary frequency drops below primary, operation changes to upper pole for remainder of enable pulse duration.

Typical DRSSTC tuning is with primary frequency below secondary (below unloaded secondary frequency).  Improves performance as arc capacitance reduces secondary frequency to match primary.  Matching frequencies with simulated arc loading (wire) is one way to get there.  More common is to just try a specific amount of detuning such as primary 10% below secondary.
2
General Chat / Tesla coil UV eye protection?
« Last post by Michelle_ on Today at 05:17:22 AM »
Any suggestions? Is just clear polycarbonate enough?
3
Solid State Tesla Coils (SSTC) / Re: Tenebrescent Potassium Iodide
« Last post by alan sailer on Today at 12:39:59 AM »
Yes.

I did some photo tests and I'm afraid showing the effect in video would be challenging. The color change
is not as dramatic as some hackmanite I've seem that goes from dark purple to almost white. The best purple
I can get from the powdered sample (under vacuum) is more of a light lavender. It's clearly visible in person
but in photos not so much.

I could cheat and over-saturate the pictures but will not.

I'm also wondering if the process of activating the powder coil is also destroying the tenebrescence as fast
as it is creating it. The darn tube gets really hot really fast.

Cheers.
4
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: First DRSSTC SKM100
« Last post by flyingperson23 on April 23, 2024, 11:07:41 PM »
When measuring secondary resonant frequency, make sure you add a wire to simulate arc loading
5
Dual Resonant Solid State Tesla coils (DRSSTC) / Re: First DRSSTC SKM100
« Last post by Saattvik24 on April 23, 2024, 10:57:39 PM »
While tuning my primary tap, I didn't quite know about the upper/lower pole operation (still don't understand it perfectly :P) so I went ahead and tried to match the primary frequency to match the secondary frequency exactly (both measured with only one coil in place at a time). But the results were not that good so I tuned it experimentally. I ended up decreasing the number of turns (4.833 turns currently) until I achieved good performance. Now I know this must mean I'm running at the upper pole.

So I wanted to ask what is usually better? Running at the upper pole or the lower pole?

Or is it so that for musical operation upper pole is better and for normal operation lower pole is better for longer arcs?
6
I finally ordered parts this week.
I have been working with Tate, (BackMacSci) and finally got everything ironed out.

Here is the circuit that I will be attempting to build:
https://www.circuit-diagram.org/circuits/24ddc75d2c05422cb0dfbe5f598448c6

Parts List:
https://www.digikey.com/en/mylists/list/6DCYSXEZJK
Total cost per unit is ~20$
I ordered some magnet wire, and I will have to wind the secondary to tune the circuit, but everything else is on that list if anyone wants to replicate this build.



I also pulled out a few of my EE Theory books, and have been reading them.

Sorry about being so quiet lately, Real life has been pretty busy.
But hopefully, I will be able to add some actual updates and contribute a bit more to this build with some real measurements.

I hope everyone has a most excellent week.
-Max
7
Solid State Tesla Coils (SSTC) / Re: Tenebrescent Potassium Iodide
« Last post by haversin on April 23, 2024, 06:00:42 PM »
If you took a video of the KI in the low energy state "bleached" with room lights on and then turned on the tesla coil leaving the room lights on maybe you could see the color change. Then turning off the tesla coil the color decay could maybe be seen. I've seen this done with mineral demos of tenebrescence but they usually turn off the room lights during the short wave UV activation to show the fluorescence.
8
I found out some interesting stuff in case anyone is curious, it turns out the static spark gap is EXTREMELY sensitive to adjustment. Fractions of a mm can change the voltage across the gap by thousands.

It seems that it needs more voltage to start than it will use for steady state. Also, interestingly, at a certain point increasing the input voltage will decrease the steady state voltage and increase the frequency of the sparking.

I think unless you're measuring the voltage across the gap it's difficult to have any idea what the real voltage is (at least for me lol). I think some people putting 24V through the flyback are not getting anywhere near 24000v across the gap, especially if it's a basic two part gap. Maybe it's different with a multi-contact gap but I'm not sure because I haven't tried one.

I calculated my MMC's maximum dv/dt at 5500v steady state (12000v/uS) and have it now set to run steadily at 5000v (with a no-load voltage of 7300). Now it's breaking out of the toroid on its own.

Does anyone know the implications of voltage vs repetition rate? It seems like it's possible to adjust it so it's repeating slower or faster but has the same voltage.

Again I don't really know what I'm doing here but I'm trying to learn.

Edit: math
9
Solid State Tesla Coils (SSTC) / Re: Tenebrescent Potassium Iodide
« Last post by alan sailer on April 23, 2024, 03:13:31 AM »
No I didn't. If you want I can take a before and after picture and show it. The color change can't been seen as it is happening
because the "lightening" is too bright.

Cheers.
10
Solid State Tesla Coils (SSTC) / Re: Tenebrescent Potassium Iodide
« Last post by haversin on April 23, 2024, 12:50:40 AM »
I didn't see the color change did you show it?
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