My tesla coil

This has several flaws I'd like to point out. The power consumption is extremely high. Something in the order of 25kW or so. This will immediately trip any household circuit breakers relentlessly. Also I'm a bit concerned that the output transformer's secondary will have some parasitic capacitance that'll throw your coil off resonance. You can correct this in two ways. Increase the frequency, so that the transformer's reactance will minimize the power consumption, but at 7nH primary, you'd need several MHz, which is hard to implement. Second option is work on your output transformer. In this form it won't work in reality.

It is a pll drsstc look the photo! It works in reality and creates 35cm sparks when interrupted. Here's a video! https://youtu.be/F1-OpP2YcU0

I hope your dad keeps an eye on what you doing ;-)

He probably thinks it's black magic

I'm not saying you haven't build it. You just haven't replicated it in EC correctly

Buggzy (😂) can you draw me one of your linear regulators where i can use sgs80da020 bjts please?

I need some specs. Voltage current e.g.

I want to make a 30V with at least 5A linear regulator with low ripple and a 350VA 35vdc transformer in input

I want to use the sgs80da020 bjts

Why not use a LM723/ua723 regulator IC with an external transistor to step up the current to 5A. It's very good, I had one running for years without any problems. There are multiple circuits online, some of which have variable current limiting as well as voltage control. I even think I have one drawn somewhere. I'll try to find it.

Wow niki you keep us all busy

Lets start with something like this http://everycircuit.com/circuit/6631754056335360

@thebugger i have some opamps like lm358 lm324 lm339 lm393 tl072 tl074 and others

And lm317 as regulator but no lm723

Yeah you can use an LM317, there are many circuits online how to boost the current to 5A. Typically it's just adding one external transistor on the output, and you're ready to go. Simple, yet effective.

And what about the current regulation?

LM317 can be set as a current regulator as well. You'd need one to handle the voltage regulation and the other the current

I want to use only one transistor for regulator

One transistor regulators work for a specific load. The output will vary with the load, unless a negative feedback is employed.