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Messages - afedorov

2
Project logs / Re: Really universal soldering controller
3A fuse for 160VA 110V transformer seems adequate. SC current of it will be about 15-20A anyway. For overload protection thermal fuse is a better choice.
In my build I characterized chosen transformer using this article, and also measured inrush current and then calculated I2t value for fusing using this video.
10
Project logs / Re: Really universal soldering controller
thanks a lot. It should be workable, I could scratch away the mask where needed. Although I probably will wait until an updated version is published. Afterall, I do not think this will improve my current solution with the resistor added to the wire.

What does C1 do in this circuit?
Scratching the mask on fabricated boards doesn't sound right. )
C1 is on power rail for energy storage and decoupling, though it's too far from IC's power pin, but this should not be a problem.
13
Project logs / Re: Really universal soldering controller
You mean earth from a main. Afedorov has a own schematic, inspired from eevblog, published somewhere here
It's not perfect, still I'm using it with no problems so far. I don't know why, but my transformer, having separate shield winding directly connected to earth, still gives decent coupling to the secondary, so I'm having around 13VAC between tip and earth with 1M protection resistor. Though, I'm sure it's better than having direct earth connection which was played with me hard couple of times.