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K&K Audio / Lundahl Transformers Welcome! Need support, you got it. Or share youe ideas and experiences. |
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In Reply to: More RAKK dac info posted by Dave Davenport on July 30, 2004 at 08:54:51:
Hello, Dave.From the article:
Although the PCM1794 current output can operate into a moderate resistance, it was designed to operate into a very low resistance: ideally zero Ohms. In the RAKK dac Passive Output, the PCM1794 current output operates into the resistance of the primary winding of the transformer (33Ω) in parallel with the reflected secondary impedance (1/16 of 3KΩ) for a total load of 28Ω.With all due respect, that's incorrect.
The primary winding resistance is in series with the primary (and subsequently any secondary impedance reflected into it), not in parallel with it.
Instead of the PCM1794 seeing the 28 ohm load you state here, it will see 1/16th the secondary load impedance PLUS the 33 ohm primary winding resistance. So, 3,000/16 = 187.5 + 33 = 220.5 ohms.
se
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Follow Ups
- Re: More RAKK dac info - Steve Eddy 09:47:14 07/31/04 (2)
- Re: More RAKK dac info - Dave Davenport 12:58:00 08/03/04 (1)
- Re: More RAKK dac info - Steve Eddy 14:53:14 08/03/04 (0)
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