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1
Dual Resonant Solid State Tesla coils (DRSSTC) / Strange gdt waveforms
« on: February 24, 2019, 04:08:35 PM »
Hi everyone,

My GDT is behaving very strangely, maybe I'm doing something wrong or maybe i have bad core material.
The core material is 3E25, AI=6900nH, dimensions are: 57.8 x 40.5 x 17.9 mm, cross section Ae=152.4 mm2, 14 turns of CAT5 wire)
When I plug my signal generator into GDT, this is the output on the secondary side (i think its not bad, maybe i should add some turns):


When I connect GDT into my driver (UD2.7C THT, which is working correctly), it behaves strangely. Gdt output with no load looks like this:


With 4,7 Ohms resistor across secondary, it looks like this:


What could be wrong ? Or should I try to connect it to my CM300s ?
I would be thankful for every information or help, thank you :)

2
Dual Resonant Solid State Tesla coils (DRSSTC) / DRSSTC impedance
« on: July 12, 2018, 08:14:38 PM »
Hi everyone!

After a lot of reading, learning, doing calculations etc. I chose these specs for my medium DRSSTC:

Secondary coil: 20x80cm (8x32"), 0.5mm (24AWG), about 1454 turns, with toroid 81kHz and 48.5kOhm impedance (I want "smaller", but with low frequency about 70-80kHz)
I will be using CM300DY-24H, so I need low frequency to lower switching losses.
I wanted to use 16cm dia secondary, but the frequency will be a bit to high and if I use for example 0.35mm wire dia (27AWG) the frequency will be about the same, but impedance will be far away from "magic 50k".

But I saw other coilers (loneocans etc.) using 16x70cm secondary with 0.35mm wire (1850turns,f=80kHz, Z=61kOhm), so
I´m asking what is better, lower impedance (about 50k) or higher with more turns and more suitable h/d raito ?

Thank you for answers

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