SOLVED - Flyback transformer driver from main power

problematic is, you actually simulate two different issues. first a 60Hz bridge rectifier power supply and second a 555 oscillating circuit. To put both into one simulation is not the best idea. I recommend you should replace the power supply with a simple DC source to be not limited by sampleing cause by the 60Hz AC source.

This app is little sensitive for grounds, try to put ground on negative side of 450uF capacitor and it should work different. And you should always put flyback diode on inductors when they have voltage jumps (they create voltage spikes), because in reality one single spike is enough to destroy 555 timer and in this circuit transformer (inductor) is on square wave voltage which have lot of voltage jumps.

Okay, I’ve made some changes, I connected the negative of the capacitor to ground, which I felt helped a little bit. I added a flyback diode, I am using a MOSFET that can withstand the voltage spikes from the transformer, so I never added one, because I’ve found that it lowers the voltage output to around 300-400 volts. I also connected a DC power supply, which quickly fixed the issue, but I think that it undermines the issue I’m really having. I should have mentioned that I’ve built a similar circuit already with the exact same issues. I know for a fact that connecting my lab bench power supply is a quick fix, but I would like to use mains power to help free up my power supply.

undermines? it shows your circuit issues !

You can try to remove 10mH inductor. You are trying to use it for smoothing voltage? Then you should put it between graetz bridge and 450uF capacitor, but it is not needed here and is just making problems.

Ok, I moved the inductor, it seemed to help a little bit, the problem appears to be that the voltage at the vc of the 555 timer reaches a negative potential, any ideas on how to prevent that?

I fixed it I, had to move the ground reference

and as you both can see, because of the 60Hz AC source you have placed you cant go closer then 139us/s in simulation timing to see whats really going on at the 555 side. but this is your decission to put two systems into one simulation with all its negative sides.

that 555 is toast haha

;-)

I know, irl there should be a voltage regulator for the 555 timer, but since there aren’t any regulators available in EveryCircuit, I just go without one

Also, I was more worried about the rectifier circuit than the 555 circuit. I’ve built the 555 circuit many times and I know it works well, so I don’t need to simulate it to perfection. I just needed to be sure that the rectifier was delivering power properly under load

when you play with it, you'll make an arc across the output, and that's fun. but when that arc opens, the magnetic field collapses, and that energy flys back across the primary side and throws over a thousand volts in both directions. the fet will cope with it if its an avalanche capable hexfet, as its body diode will zener. but the rest will be damaged.