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In Reply to: RE: Lundahl LL1545A, best dac connection posted by eirper@ath.forthnet.gr on October 18, 2015 at 06:21:40
The DC resistance of the transformer windings are added to the source impedance (and transformed by a step-down ratio, if that is used) to get the output impedance of the combination, so your results make sense. If you want lower output impedance, then you must use a transformer with lower resistance windings. The LL1545A was not designed to be an output transformer. Something like the LL1527 would be a better choice.
Kevin Carter
K&K Audio
www.kandkaudio.com
Follow Ups:
Thanks for your advices, Kevin.
Your help are much appreciated.
Kevin,
How much dc-offset can removed this type of transformer, without any problem?
Very little DC offset is tolerated by this transformer. I think that mVs is too much.
Kevin Carter
K&K Audio
www.kandkaudio.com
The one dac channel output has <3.5mV and I don't measure any dc-offset at the lundahl output.
Is there any way to see the limit in this case?
For example, if the output of LL1545A remains 0mv, this is a sign that enough or created other problems?
Since it's a transformer, it won't pass DC, so you won't measure any offset at the secondary connections. When the offset is too large, the core is saturated, and bass frequencies are essentially not passed by the transformer. Run a frequency response sweep or just listen. It will be obvious.
Kevin Carter
K&K Audio
www.kandkaudio.com
Thank you for the very nice explanation, Kevin.
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