Assymmetry or "offset" in your AC really only matters if you have toroidial input transformer
and thus my question.
Unfortunately I dont have a scope yet
percy said:Is there an easy way to find out if there is any (and how much) DC offset is present on my household ac line or not ?
I have built an AC Mains servo circuit, to correct for DC-offset.
A simple uA741 OP-Amp will sense any offset via 2 resistors 2 caps network feedback
and activate High Current Relay Switches to correct Mains AC back to zero offset.
If you plan to use a toroid transformer just go ahead. If it turns out that it on and off hums rather irritating then you have a solution.percy said:Is there an easy way to find out if there is any (and how much) DC offset is present on my household ac line or not ?
To measure the DC is rather hard to do so forget for now.
Here is thread about the topic.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=2080&highlight=
DC offset should be rare now. The main cause used to be those live chassis TVs from the 1970s that had a horrible half wave SCR regulator. Hopefully these are long gone.
The power companies were not happy about these asymmetric power supplies as the dc load caused problems fot the substation transformers.
The power companies were not happy about these asymmetric power supplies as the dc load caused problems fot the substation transformers.
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