I would expect it to depend on the VA rating.
A couple of milliamps while the transformer is passing 10 amps AC shouldn't upset it too much.
using EI traffos, the effect of dc on the line is almost nill as
EI's have air-gaps that served to mitigate the effect of dc on the line...
torroids are most affected otoh...
EI's have air-gaps that served to mitigate the effect of dc on the line...
torroids are most affected otoh...
power of suggestion...😎
also expectations, after all why go thru all the trouble and not hear any improvement?
Of course it depends on the extent of the DC and on the BH-curve of the core material and the number of windings and ...and ... and...
But basically the primary winding of a transformer is an inductance connected to the mains (simplification at max 😉 ) and if the core gets saturated all the inductance is gone and the dc resistance of the copper material is all that is left.
Thats why mains dc is more a problem for toroidal transformers (steep BH curve, no air gaps, low losses) and less problematic for small transformers (200 VA for example might have a dc primary resistance of ~20 Ohms while a 1kVA might have only a couple of Ohms)
It is main AC filter and has no any relation to DC blocker. I already presented my opinion about DC blocker here on forum. Based on my small experience, little DC component in home AC lines induce some mechanical motion for toroid windings and they make noise. I did not see any similar issue with any other types of tranys. Second, DC can't get through transformer to secondary. However, it can make damage in long run when primary might get short due to vibration which creates friction between loops of copper. All who believes that DC blocker can introduce BSQ is talking about voodoo. It is my personal opinion and I'm not trying to convince anyone.
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I have only heard (by listening to music) and seen good things with blockers and the effects are immediate and real. One i sold to a guy whose AC filter hummed stoped the filter humming almost completely. I wouldn't use any gear without one.
Nothing to do with DC passing through trannies, all about saturating primaries.
Nothing to do with DC passing through trannies, all about saturating primaries.
Resistors are intent to remove potential oscillations. It's is advise from Keantoken. I did not tested without resistors, but with them I have very nice sinus. No spikes or oscillations.
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I've tested with and without. They make a very notable difference.
Alex did you mean it's sharper with the filter, and not without?
Yes. It is thin line sin wave on my scope. 3 times thicker I see when I measure on receptacle out.
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I used 121 my analog scope setting with no any changes in between filtered and not filtered. Unfortunately, I did not take pictures, but next time I'll do and show them to forum.
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In case you have oscillations, what do they cause then?
I have never seen those in commercial filters.