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1
Could be high frequency oscillations, from a bad potentiometer, that makes the circuit RC circuit for timing, suddenly have a very low R value or even also the C being defective, giving you a frequency in hundreds, maybe into MHz.
3
Especially for DRSSTCs where we can be switching 4x the rated max current or more, it's important to maintain zero current switching. The interrupter doesn't have any constraints for when it turns on/off, so almost definitely it will turn off when the primary current isn't zero. The interrupter signal feeds into the flip flop so that when the interrupter turns off, the flip flop waits until the next rising edge of the feedback to turn off the coil. This means the coil itself is guaranteed to turn off only when the primary current is zero.

Thank you very much for the clear explanation.
4
Especially for DRSSTCs where we can be switching 4x the rated max current or more, it's important to maintain zero current switching. The interrupter doesn't have any constraints for when it turns on/off, so almost definitely it will turn off when the primary current isn't zero. The interrupter signal feeds into the flip flop so that when the interrupter turns off, the flip flop waits until the next rising edge of the feedback to turn off the coil. This means the coil itself is guaranteed to turn off only when the primary current is zero.
5
Dual Resonant Solid State Tesla coils (DRSSTC) / Turning SSTC into DRSSTC
« Last post by Simranjit on June 12, 2024, 10:23:08 PM »
Hi, I finally built my ramped SSTC (using esp32 as interrupter) which uses mains ac for ramp. Using half bridge configuration I was able to get around 7.5inch sparks at 30% duty cycle. My question is that if I add capacitor to primary this will indeed turn into DRSSTC. But now according to LabCoatz:
This is where the flip-flop comes into play: essentially, it prevents the interrupter from shutting off your transistors while current is flowing, which could kill them if you’re running in dual resonance.
I also looked at truth table of flip-flop 74HC74N. So according to my understanding we have to turn off interrupter at the next rising edge of clock/feedback. Is that correct, please help me clear it up a bit more. Also wouldn't it be better to turn off interrupter when signal is low instead of waiting for next rising edge?
6
I currently do not have the UVLO jumper connected, I also read the normal voltages on every IC and regulator and 24v on the input so I don't really suspect a short anywhere
7
The OCD light doesn't only shine for overcurrent, iirc it also shines for undervoltage lockout and sometimes when it's powered on before it gets an interrupter signal. Given that your 9v regulator is burning up, maybe something on the 9v or 5v rails is shorted and is pulling the 24v rail down enough to trip uvlo.
8
A very simple voltage control is to use a corona gap. Position a small sphere near the top dome and ground this small sphere thru a large resistance. If the voltage of the dome rises the corona current increases and loading down the VDG voltage and if the voltage lowers the decrease in corona current lets the VDG voltage go higher. The distance between the small sphere and dome determines the voltage.
9


Hey, so I need some help my UD2.7C constantly being in OCP, I’m feeding a sine wave signal of about 52kHz with an amplitude of about 3 volts into the feedback jack, for the signal I’m just momentarily shining my phone flashlight into the optical receiver, I know I’m getting a signal since the signal LED lights up every time, one thing I’ve also noticed since the beginning is the 9v regulator heating up immensely after about ~10 secs, no other IC is heating up

How I know the UD semi-works? The first time I hooked the thing up and tested it, I got a signal on the gate drive that magically vanished after I turned the UD on again.

Some help would be gladly appreciated.
10
I think you can find some ideas on how to do it, from this thread on Tesla coils measuring topload voltage: https://highvoltageforum.net/index.php?topic=2625.0
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