M2TECH Hiface USB->SPDIF 24/192Khz asynch

[jkeny]

It's stable as it's legs are component leads & so stiff - one of these is soldered into the XTALIN hole vacated by the crystal, the ground lead is soldered to another fixed spot, the ground connection on the board (you'll see it better in the pics). BUT this is not the optimal arrangement for the clock - I believe it could be made more stable & secure & closer to the Cypress chip - I might even put it on top of the Cypress with a short, fine wire to pin 12 (XTALIN) - this was all pretty much a proof of concept thing.

Here's the pics:

1. Pic of full DAC, trafos & amp. the trafos are Sescom MI-97. The white top is an octal tube socket into which the Sescoms plug.

2. Battery powering the clock & USB cable powering the rest. Noticeable sound improvement - haven't had a chance to test with external power to the DAC, yet

3. The clock is mounted on the board about 0.5" above the board- it's clock out wire lead soldered into hole vacated by crystal. Gnd lead connects to where the green wire is soldered to the board. I de-soldered the original cap that was on XTALIN board track from the crystal to ground. I put a 22pF styrene load cap across the clock out to gnd underneath the clock board - you can just see it sticking out of the far side of the board. I also soldered a 0.1uF cap under the clock board between VDD & gnd.

[FAA]

Nice work jkeny, just want to ask what is the part number of the clock you used? thanks

[jkeny]

The clock is a Crystek C33 24MHz - Mouser Part No 549-C3391-24.000
I'm just thinking, I will probably mount the clock on top of the Cypress chip if I can find a stable way of connecting it. A shorter lead from clock to chip is no bad thing but I don't expect to hear any improvement.

[jkeny]

One thing I wanted to check with you guys:
As my test CD, I'm using Herbie Hancock's River (The Joni Letters) recorded from CD as WAV to HDD on my laptop. On the recording there are parts (30 secs or so) in some songs that sound like a hiss & I have always assumed that it was a cymbal being brushed but not resolved properly by my system. In other parts of the recording I can distinctly hear cymbal brushing so I'm unsure what this noise is. It's on the first song & the Tina Turner one that I can remember & probably others. I'm not at home so can't give the exact time refernces for these but anybody who has the CD will know what I'm referring to.

So with my modded system I can hear still hear this hiss even though the rest of the recording has more texture & detail to it. Can anyone confirm or otehrwise what I'm hearing?

[kosmolesch]

Mi scuzi,but e-mu 0202 cost under 100 bucks - and can i2s with
any 32-192 sample rate..)))
Oscilators in emu - are not top grade but aren't totaly ****...

Don't understand what are you looking for - pro audio is sonicaly **** ,but ! it will work as digital interface flavecely...

Jkenny pcm1793 is rubish as 1798 1796 1795 and other ****.

Try pcm1792 1794 . Or analog.
Your will be totally satisfied.

[jkeny]

Originally Posted by kosmolesch

Jkenny pcm1793 is rubish as 1798 1796 1795 and other ****.

Try pcm1792 1794 . Or analog.
Your will be totally satisfied.

Don't worry, I'm not saying the PCM1793 is the best DAC - it's just the one that's inside the Musiland 01US & it's sounding good with output transformers. I'll be using an external Sabre32 with either I2S or SPDIF

I don't know what the rest of your post is about or is in response to ?

[okkyn]

kosmolesch,

Did you do something with e-mu 0202? Please share..

[danny_66]

Hello jkeny,
the guys from diyhifisupply did also some mods like you on the Musiland 01 USD and afterwards a listening session with several people.
After the mods the 01 USD sounds as good as their reference CD-player:
Music Server Computer transport - Hop On!

[jkeny]

Thanks Danny, I didn't see that thread before - I'll have a look

[jkeny]

Guido, did you ever get that Musiland? How does it compare to HiFace