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[SOLVED] Need help with OPAMP circuit pls.
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Chriss:

--- Quote ---Nearly all AC:DC power supplies contain transformers.
--- End quote ---
You alright about that, I was thinking in iron core transformer where are the two coils separated from each other.
Somehow I more trustful in this type of AC/DC adapters, I also know about the efficiency of those robust old transformers but I saw a lot a time huge damage on the secondary side when that low-cost psu's are failing.
Most of the time such a failure was made because of a shored cap which is connected between the primary and sec side of the switching psu.
I can't know the quality of that almost always made in China switching mode psu's...
But however, I agree with your consideration.


--- Quote ---As far as your UPS is concerned: are you sure you're looking at the gap between the mains and DC traces?
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Yes, I look at the gap between the mains and DC trace, maybe it is 1.5mm but not more.
It is hard to measure and I have also sayit is a low-cost UPS.


--- Quote ---I recommended a distance of 5mm between the mains and DC side...
--- End quote ---

I have a distance around 8-10mm.
So I think that will be ok.

Btw.
I made the correction as you suggested in your post here: 
--- Quote ---November 24, 2018, 12:57:42 am
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and the stuff works like a charm!
I'm very happy.
Thank you.
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