Well.. Nothing was broken. I think the board just crashed from the interference generated by the coil. I will try to shield it better.

I have a question: Should I implement an soft start for charging the main caps? I m thinking at something simple like this.

My secondary resistance is about 315 ohm

I don't have real probes, i have the probes that last owner of the scope used. Just an alligator clip connected through a wire to an BNC connector, soo no components inside the probe and stuff.

I fallowed this video to make the current transformers: />
The current limit is set to 160A for now.

I think my phase lead its not tuned good yet, because I don't have a good inductor.

(Sorry for late response)

Hello,
I m 16 years old and I made my first DRSSTC. The problem is that it doesn't produce big arcs and its pulling kinda lot of current It uses ud2.7 that drives an full bridge made out of 8 40n60 igbts (2 in parallel for each part of the bridge). the MCC has 150nf. The secondary is wind on a 110mm pvc pipe with a wire of 0.2 - about 1800 turns. Primary is made out of 10mm coaxial cable - 7 turns. The scoped signal is the current through feedback transformer with a can as the primary load . the phase lead its not enabled yet. the second photo with scoped signal its the current through feedback transformer with secondary installed.

Yea. i searched on ebay to, but everything is toooo expensive for me.

I want something a bit cheaper.

Hello!
I stated working on an TL494 SMPS inspired by an video i found on youtube.
I design and made the pcb for it in easy eda and each the pcb. today i soldered everything on the pcb.
i powered up the control circuit, but nothing. no output signal. i checked the voltages and they are ok.
can anybody tell me what is wrong?
Video: />Original schematic: https://i.ibb.co/my9NCzf/50v40a-power-supply-and-arc-inverter-welder-By-devreci.png
My versions: https://oshwlab.com/No_op-amp/smps

Hi
I want to buy an cheap oscilloscope and i have 2 options.
An DS212 from Miniware or an HM412 from Hameg  in working conditions that i found on an online marketplace.
The DS212 is 80$ on Aliexpress and i need to want 30 days for it to arrive
The HM412 is 50$ and i need to wait 2 days for it to arrive.
What should i choose. i cant decide .
Thanks everyone in advance!