Yes, See "Typical Application" on the first sheet of this:
http://www.jensen-transformers.com/datashts/11ympc.pdf
Note: You don't try to use both at the same time...
Hey Ed!
I cannot open that link (blocked by my blocker) do you know another way into that?
EDIT=> I got it! (now some reading...)
Second Edit => And I know I can't run both at the same time, but thanks!
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There really is no proper RCA for digital, they are the wrong impedance, but the manufacturers use them any way. You can switch to BNC or even F connectors if you like, or just use RCAs.
The Lundahl 1690 and the Jensen JT11-DMs or BMs seem to be the top choices, but the Jensens are way cheaper over here.
Bill is correct about the Jensen article, it is quite useful.
One thing that will probably differ between the two transformers is the inductance in the windings. The consequence is that that depending on the load input impedance (somewhat) and the source output impedance (strongly), you will be creating a high pass filter and reducing the low freq response. Most manufacturers do not list the inductance, so you may need to experiment.
Thanks for that info Bill. Since I am integrating with 'commercial' transport and preamp before and after, respectively, I want this to be 'robust' and able to handle future changes before and after if they occur. Obviously tailoring everything in the chain is best; however I have to be practical for myself as well.
I have no doubt this gizmo will sound so much better than my Aragon D2A (version 1!) so I will be happy!
PS a member here has provided me with some Lundahls so I'm going for them! Just a few details to sort out and I'll be sniffing solder fumes!
Hi All. I recently received a completed DAC that is based on this diy project. It came with the dual LME49720HA op-amp installed and with 2 others in reserve : a dual LT1363 and a dual OPA627. I presume the effect of exchanging one op-amp for another would be tonality changes. Can someone point me to a page or link where I could learn of these differences in tone?
Thanks very much.
Thanks very much.
To be honest the whole op-amp thing is subjective and opinions will vary as much due to equipment and set up as well as musical tastes.
I preferred LME49720HA to OPA627 but don't ask me to use subjective hi-fi speak - it just made the music sound better.
You could do a search on the forums for the op-amp models in question but really you should plug them in and have a listen. It's the only way to find out
If anyone is planning on running output trannies instead of opamps (eliminating the 15v supply), you can get a real dirt cheap power tranny here: 8V/1.6A Multi-Tap Transformer
I bought several of these and am running one in parallel (@ 1.6A) in the DAC. Well made Tamura and it works great!
BTW, I am now using the Edcor's for the output. Does it sound better than opamps? I don't know. If I can't A/B them on the fly I can't tell
I bought several of these and am running one in parallel (@ 1.6A) in the DAC. Well made Tamura and it works great!
BTW, I am now using the Edcor's for the output. Does it sound better than opamps? I don't know. If I can't A/B them on the fly I can't tell
CS8416
The CS8416 has no pullup resistor on pin 20 (TX)? Looking at Cirrus App note, they show poor jitter and higher THD+N when you run this default PLL setting for the phase detector update rate. http://www.cirrus.com/en/pubs/appNote/AN339REV1.pdf
The CS8416 has no pullup resistor on pin 20 (TX)? Looking at Cirrus App note, they show poor jitter and higher THD+N when you run this default PLL setting for the phase detector update rate. http://www.cirrus.com/en/pubs/appNote/AN339REV1.pdf
I'm having some troubles with this DAC not sounding so great (Lars V1.0 08/2010), so I have been diggin' into it with a scope and my ears
It's a lot of fun so far, started with CS8416 mods:
Added 0.1uF+2.2uF SMT decoupling caps on VD and VA, added 100uH inductor between VD and VA. That cleaned up the rails.
Added 47k pullup to pin 20 TX ;is only good 32-108kHz, beyond this i.e 192kHz "loss of PLL lock may occur"
I did not yet update the PLL filter from 10nF/1K/22nF to 1nF/3K/22nF;
The RMCLK signal is pretty mushy and I have to verify timing.
This gives quite an audible improvement at 44kHz. It sounds cleaner, less grit with loud passages and fine detail is more consistent.
With the upsampler, I didn't hear a difference although the board is still needing work.
I find the small Elna electrolytics on the board are crap. The are showing high ESR/DF and high leakage so I am swapping them out.
It's a lot of fun so far, started with CS8416 mods:
Added 0.1uF+2.2uF SMT decoupling caps on VD and VA, added 100uH inductor between VD and VA. That cleaned up the rails.
Added 47k pullup to pin 20 TX ;is only good 32-108kHz, beyond this i.e 192kHz "loss of PLL lock may occur"
I did not yet update the PLL filter from 10nF/1K/22nF to 1nF/3K/22nF;
The RMCLK signal is pretty mushy and I have to verify timing.
This gives quite an audible improvement at 44kHz. It sounds cleaner, less grit with loud passages and fine detail is more consistent.
With the upsampler, I didn't hear a difference although the board is still needing work.
I find the small Elna electrolytics on the board are crap. The are showing high ESR/DF and high leakage so I am swapping them out.
As I recall, both of mine have Nichicon Muse caps. The boards are so damned hard to desolder on the older ones it's a real gamble. I changed the PLL filter first thing, never saw the app. note. on the pullup. I primarily use the one that still has the 8416 with a Squeezebox, probably all 44khz.