600/10k for ian canada's dac output

Design and use of the various types.
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p2mc
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Joined: Tue Jan 26, 2021 1:24 pm

600/10k for ian canada's dac output

Post by p2mc »

H everyone, im' looking a verygood transformer 600/10K to remplace the lundahl 1544a.

Many people say me that i will find the Graal with intact intact Audio, so here i am.

All the best,

Paul
dave slagle
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Post by dave slagle »

do you have more info on the dac and how the transformer is implemented?

600:10K suggests a 1:4 step up but more info is needed on the actual application to design the needed transformer.

dave
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p2mc
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Joined: Tue Jan 26, 2021 1:24 pm

600/10k for ian canada's dac output

Post by p2mc »

Hello Dave,

this is the documentation about the dac

ian-canada-dual-mono-es9038q2m-

and the wiring of the pdf,

this is ok ?

with all the best
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dave slagle
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Post by dave slagle »

This is along the lines of what the hifi wigwam guys were doing with really low loads and a step up transformer. Conceptually it is the correct way to do "transformer" i/v since it applies the load directly to the dac and then uses the transformer for isolation/gain. Most people use a resistor on the transformer secondary to reflect the desired I/V value but the worst sonic thing you can do to a transformer is unnecessarily load it.

600Ω is a typical number used for i/v and many simply follow that with a cap or a 1:1. Ideally a current out Dac wants to see a dead short but as the load approaches the ideal the voltage drops to 0. Your referenced idea cuts the voltage in 1/2 by dropping the load to 300Ω and then multiplies it by 4 with the step up. The extra voltage can be nice but the output Z is 2400Ω so attention needs to be paid to what it drives. The schematic shows XLR connectors and a captured gain stage would be a better approach imo.

The transformer is not too difficult but in theory the most compromised transformers are the low ratios like discretely wound 1:1's to 1:4's. Moving to a 1:8 or higher and a captured active stage would be the direction I would look.

dave
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