Hi Everyone, and thanks once again for all the advises.
So this is redesigned circuitry. I’ve included a photo so that you can assess it.
The 12v side is assembled on the veroboard and the 5v is still on the breadboard. I ran all the earths back to the battery terminal. I use IRGS14C40L IGBT with internal voltage clamping. Improved the heat-sink and changed the battery to a car battery. I put 18v Zenner and 6.2v Zenner on 12v and 5v respectively. After 5v regulator the 5v power line goes through 100mH inductor and schottky diode. I’ve got 0.1uF capacitor from MCLR pin to ground.
Ran the circuit first time with IGBT disconnected no problems. Connected the IGBT but left the secondary winding open circuited (in this case coil fires inside of itself) no problems. Connected the secondary winding circuit(earth). I think secondary winding earth (black/red wire on top of the coil) acts as an aerial. Got the Reset problem back. After several firings the driver TC1427 got hot and locked the output to 12v irrespectively of it’s input.
So I replaced it with the old op-amp LMC6482IN. Several firings and it got hot and stopped functioning.
These are all the results up to now but I shall keep on working
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