Thank you abraxalito, I'm looking for pretty small trafo. PSU from subbu has one that's not so small, but ultimately proposed one (for Touch) has it.
How do people listen to CD with vintage setups? Do they connect 2V out to 150mV in on pre or 1V in on power?
Depends. What is your preamp ? It would help to know exactly what we're dealing with.
Signal to noise ratio.
edit: a good article to read in this context: http://www.diyaudio.com/forums/diyaudio-com-articles/186018-what-gain-structure.html
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I don't know how other people do it, but I know how I'd do it. Wind a trafo - attenuators will never give as good subjective performance (aka dynamics) as a decent trafo.
00940, I'm buying Sansui CA-2000 and BA-2000. Pre has -20 dB attenuation but is meant as mute function. I have no intention to modify anything onboard in irreversible or harmful way.
I know that SNR lowers but I was thinking why not using my pre instead of opamp or is this a bad idea?
I'm reading this article right now, it's very good. Thank you.
I know that SNR lowers but I was thinking why not using my pre instead of opamp or is this a bad idea?
I'm reading this article right now, it's very good. Thank you.
Some DACs has trafos as a way to go in te documentation/project.
I like the idea of using trafo since I've read about and it's not complicated to wind a trafo for me (I have manual winding machine at home) but I do not have enaguh knowledge to pick one or calculate it and measure it prior installation. Any good indepth source of knowledge for begginers?
There's really only one equation that you need, along with data for your chosen core. That equation relates the lowest frequency and greatest amplitude that you need the trafo to pass to the number of turns required on a particular core. It can be found in pretty much any transformer design book. I don't have it to hand but I can dig it out for you if you can't discover it yourself with Google.
I'd suggest going for an easy to find core like RM14.
I'd suggest going for an easy to find core like RM14.
For line level transformers, there are always those core: Nickel Permalloy EI 35 Core AND Bobbin FOR Transformer | eBay . And Yvesm has posted a calculator called opt_da on this forum. Still, there are about no reasons a transformer should be better than an attenuator in this case and many reasons a homemade one could be much worse.
I got the service manual of the sansui. Looks like the gain of the input gain stage could be modified with just one resistor change and maybe one capacitor. I'll look into it later.
I got the service manual of the sansui. Looks like the gain of the input gain stage could be modified with just one resistor change and maybe one capacitor. I'll look into it later.
Wow. Calculator + best practice (firm and strictly parallel winding) could give good results even for newbeeies (with good core ofcourse). But I'm aware and afraid of what you are exposing (especially because I have not enaguh knowledge nor tools to mesaure and test it). I'll definitevly digg in to it!
And attenuation with such non-invasive (at least it reads that way) modification by adding 2 couples of R&C is an option. I'll take it in consideration.
If you intend to use Yvesm's calculator, a lot of basic questions on its use are covered here: DIY Simple Output Transformer , even if the focus is more on output transformers.
I went through all posts (as my prior reading was quick and sloppy).
What would you do? Would you connect DAC's out of 2 VRMS converted with transformer (not a part of passive I/V or I have to modify DAC implementation to have passive I/V to benefit of trafo "attenuation"?) like this one to preamp (CA-2000) with sensitivity of 150 mV or converted with another of voltage ration 1:2 to power apmplifier with sensitivity of 1 V? My first DAC will be based on ESS9023 (where I can not bypass opamp).
Is using an external preamp (like CA-2000) without/bypassed opamp on DAC a good idea (on chips where is it possible, for example: ESS9018 or PCM1794)?
BTW, for newbies like me (if somebody is reading), I found good explanation what I/VC and low-pass filter are here: https://www.by-rutgers.nl/IV-converter.html
More nice articles (even in english) are on this site under Artikelen over Audio: https://www.by-rutgers.nl/
What would you do? Would you connect DAC's out of 2 VRMS converted with transformer (not a part of passive I/V or I have to modify DAC implementation to have passive I/V to benefit of trafo "attenuation"?) like this one to preamp (CA-2000) with sensitivity of 150 mV or converted with another of voltage ration 1:2 to power apmplifier with sensitivity of 1 V? My first DAC will be based on ESS9023 (where I can not bypass opamp).
Is using an external preamp (like CA-2000) without/bypassed opamp on DAC a good idea (on chips where is it possible, for example: ESS9018 or PCM1794)?
BTW, for newbies like me (if somebody is reading), I found good explanation what I/VC and low-pass filter are here: https://www.by-rutgers.nl/IV-converter.html
More nice articles (even in english) are on this site under Artikelen over Audio: https://www.by-rutgers.nl/
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