rickcr42
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Rest in peace my good friend.
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Post by rickcr42 on Jan 7, 2009 19:16:44 GMT
or just a valve rectifier but only for the digital stages.You want wideband and fast for the analog section but the digital will actually thank you if you slow things down a bit as in band-limiting the stray crap out of the power nodes Internet Article: digilander.libero.it/paeng/a_24_bit_dac_full_article.htmoriginal magazine article pages: www.audiodesignguide.com/doc/pag1.jpgwww.audiodesignguide.com/doc/pag2.jpgwww.audiodesignguide.com/doc/pag3.jpgwww.audiodesignguide.com/doc/pag4.jpgwww.audiodesignguide.com/doc/pag5.jpgwww.audiodesignguide.com/doc/pag6.jpgwww.audiodesignguide.com/doc/pag7.jpgwww.audiodesignguide.com/doc/pag8.jpgwww.audiodesignguide.com/doc/pag9.jpgwww.audiodesignguide.com/doc/pag10.jpgWith analog it is the lower regions that usually cause problems-hum/ripple,but with digital it is all about the ultrasonic range so you need to think more in terms of a radio transmitter/receiver than you would traditional audio and with that not JUST what can get in but also what can get out with the "out" including one chip talking to another and why it is always a good idea to think not just coupling/decoupling but individual chip isolation so the one does not "talk" to another because they are both on the same power feed and why on some DACs you will see an LCR filter right AT the pins of every single digital power input to the chips.This is NOT an Rf filter,though these too are usually present,but an isolation filter meant to segragate the individual chips. another source of potential problems is the mains line which if "scoped" will typically be disgusting to look at when it becomes visually apparent just how many "riders" are coming in along with the sinsoidal so again,you need to limit the bandwidth (line filter for youse non-rickanese speakers) dealing with the problem at the source rather than lter on at each final destination. These "filters" get a loty of bad press but if you read between the lines it becomes apparent it is only in high current draw analog apps where you will get any downsides while in digital circuits,circuits that are mostly static (meaning in short the power supply is less a PART of the signal being more of a true power supply only device) unlike analog stages which are "dynamic",will be bettered by the addition of. finally.All you filter users should consider "snipping" any "hot-to-common" and "nuetral-to-common" connections inside the filter if you want to avoid the dreaded mixed-signal-multimedia-system ground loop $^&*^%$5565 Clean power in,bandwidth suited to end useage,stage isolation,stable voltages-all good  |
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Deleted
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Post by Deleted on Jan 7, 2009 20:14:45 GMT
Also helps to stop those earth leakage breakers from tripping at the most inconvenient times.
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rickcr42
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Rest in peace my good friend.
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Post by rickcr42 on Jan 7, 2009 20:37:54 GMT
We call them "GFI's" or Ground Fault Interruptors and yup,dead on  |
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leo
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Post by leo on Jan 8, 2009 3:01:32 GMT
Not that it matters in the big scheme of things but this is the THIRD (3rd) time that a post of mine has been erased. I posted yester on using valves on a toaster oven and on a pressure cooker, it was a joke. Now it is gone. Wonder who is having all the fun! It wasn't me |
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rickcr42
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Rest in peace my good friend.
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Post by rickcr42 on Jan 8, 2009 3:04:24 GMT
well whoever it is it is NOT FUNNY and they need to cut the shit ASAP !
There is no room here for that and if a person goes that route at least have the balls to stand up and be counted so we can ALL share in the joke unfunny as it may be.
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rickcr42
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Rest in peace my good friend.
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Post by rickcr42 on Jan 8, 2009 3:36:57 GMT
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Post by Deleted on Jan 8, 2009 4:24:20 GMT
Miguel Don't worry. I suspect many of us OLDER members forget where we post messages. Hell, I have even been forgetting where I put down my spectacles, since before your age.  Alex |
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Post by PinkFloyd on Jan 8, 2009 10:22:29 GMT
Rick, you are pure class mate  On a serious note (e minor as it happens) "admin" does have access to a security log and we can see exactly who did what, where, when and how.... example: Today at 9:27am sandyk 122.107.122.174 Deleted post titled Re: Another rant ... kind of posted by sandyk. Today at 5:43am sandyk 122.107.122.174 Modified the post Re: KHA; or, the Jaycar amp going places. posted by sandyk. Today at 5:09am senntinal 124.197.7.219 Modified the post Re: KHA; or, the Jaycar amp going places. posted by senntinal. Today at 4:30am sandyk 122.107.122.174 Modified the post Re: Blue Ray player posted by mrarroyo. Today at 3:00am rickcr42 71.234.169.181 Modified the post Re: el cheapo DAC posted by rickcr42. Today at 2:52am rickcr42 71.234.169.181 Modified the post Re: Another rant ... kind of posted by rickcr42. Today at 2:44am rickcr42 71.234.169.181 Modified the post Re: CES 2009 posted by rickcr42. Today at 2:32am mrarroyo 216.189.175.192 Deleted post titled Re: CES 2009 posted by mrarroyo. Today at 2:07am leo 81.105.225.141 Modified the post Re: el cheapo DAC posted by leo. Sooooooooo! rest assured, Miguel, that the culprit would soon be exposed IF there were a culprit to expose ;D Nope, looks like it was indeed a false alarm and you're starting to go senile. I give you the five knuckle shuffle salute!  |
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rickcr42
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Rest in peace my good friend.
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Post by rickcr42 on Jan 8, 2009 23:58:37 GMT
I knew that bro.Remember,I have been at this "OH NOOOO ! HE HAS ACCESS TO THE CONTROL PANEL !" game for a damn lot of years now (combined goatfi/snot grotto shepard of the sheepies comes to damn near 9 years I think) so beleive me when I tell you someone would have been on my "list" and to be honest I am GLAD it was a false alarm rather than an actual event since I would hate to think any of our members/mods would go so far into asshole territory for personal reasons so if real would have been one of those tasks you REALY REALLY don't want to do but being in a position of responsibility my JOB would have had to bite the bullet ,find the culprit and then after having lost all respect for that person deal out a punishment suited to the crime and man,I pretty much like everyone here so that would have sucked big time
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Post by minivan on Jan 11, 2009 11:38:37 GMT
leo: do u know what's the reason when i have the spdif going direct to the buffalo dac, (spdif switch on, with all dip 1-4 at +) i can hear a very low click and pop once a while, but when i have the spdif going into the twisted pear spdif receiver ( with wm8004 chip),(spdif off and dip 1 - on buffalo) no more click and pop and the noise floor is lower.
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leo
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Post by leo on Jan 11, 2009 12:16:11 GMT
When you get the click noise, does the green led for the lock go on and off at the same time as the click?
I noticed sometimes when the central heating comes on or if something is plugged into the mains the lock led goes off and comes on and I hear a click
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Post by minivan on Jan 14, 2009 11:10:46 GMT
i put a transformer PE-65612 before the spdif input and it seem to solved the problem of the pop and click, still can't put with 96 khz through, read that u need to upgrade the comparator?
i like the spdif receiver on the buffalo more then the spdif receiver with w8004 chip, sound smoother.
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leo
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Post by leo on Jan 14, 2009 18:49:03 GMT
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leo
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Post by leo on Jan 15, 2009 19:01:09 GMT
 , what is it?  Something we need in the UK |
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insomniac
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Post by insomniac on Jan 16, 2009 1:07:11 GMT
, what is it? Something we need in the UK Imagine the opposite of air conditioning |
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leo
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Post by leo on Jan 16, 2009 1:27:49 GMT
I hope the following warms you up!  Thanks Miguel, shame they wasn't playing golf, there wouldn't be any shortage of golf tees ;D |
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Spirit
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Post by Spirit on Jan 16, 2009 4:56:55 GMT
I hope the following warms you up! Thanks Miguel, shame they wasn't playing golf, there wouldn't be any shortage of golf tees ;D I couldn't do it - my swing is less than consistent at the best of times |
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Post by minivan on Jan 18, 2009 12:35:06 GMT
i am so excited, i manage to tap the i2s signal from my emu 1212m sound card for my buffalo
this is what i did:
on the analog card where the dac chip reside, it's a cs4398 chip, by looking at the data sheet and using a multimeter , this is how i derive the i2s signal
ribbon cable socket(pin5) to dac (pin 3) SDIN (serial data in)
ribbon cable socket(pin 8) to dac (pin 5) LRCK (word clock)
ribbon cable socket(pin 13) to dac (pin 8) DGRND (DIGITAL GROUND)
ribbon cable socket(pin 10) to dac (pin 4) SLCK (serial bit clock BLCK)
ribbon cable socket(pin 9) to dac ( pin 6) MCK (master clock) (no need for buffalo dac)
the ribbon cable on the emu1212 is similar to the one on the floopy disk, so i just took one from an old pc, cut it at one end and soldered it onto some shield audio cables. according to the manual of the buffalo this is how u connect the i2s signal
from sound card to buffalo
cable 5 to D2 on buffalo
cable 8 to d1 on buffalo
cable 10 to dck on buffalo
cable 13 to g on buffalo
i used foobar kernal streaming playing flac,
for emu patchmix software setting , i use
wave 1/2 to out 1/2 i/o card ,44.1khz
if someone know a better way please let me know, i am still not very familiar with patchmix
the sound quality of i2s does sound better then spdif, just like other said it has better air and space between instrument.
i still have some problems with this setup, when i try run 96khz, all i get is pop and click, it seem like the buffalo does not like it.
i measured the voltage reading of the :data, word clock, bit clock, all giving me a reading of about 3v AC, and about 1.5 v DC, what does the 1.5 dc reading mean? is it good to run dc signal into the buffalo dac?
other info i found out:
audio data come out from a chip lcx244, this is a buffer chip.
there's a receiver chip called ak4112, this is a receiver chip, looking up the data sheet it seem like it can run in slave mode, so may be there's a possibility of running the emu1212 digital card in slave mode with the dac on master mode?
now that the analog card 0202 is not being used, it's possible to made a dac out of it by using a receiver, psu ,etc.
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Spirit
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Post by Spirit on Feb 9, 2009 12:23:52 GMT
So Mr Leo, and minivan... How do they sound!!! minivan... your avatar hurts me |
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Post by minivan on Feb 12, 2009 7:57:36 GMT
the buffalo sound very good, i had a 8xt1543 dac on steroid, a ori mod discreet output ad1895 dac, a cs4398 dac, so far all these dac are on the sideline. i prefer the buffalo out of the lots. i just found out you can tap the i2s signal from the toshiba mp3 player, www.rockbox.org/twiki/bin/view/Main/GigabeatCustomdockit mean you can turn it into a transport, and feed i2s signal from the mp3 player to the buffalo, just bought one of this and waiting for it's arrival, if it all work out well, i will integrated the toshiba pap into the buffalo and turn it into a self contained transport/source unit  |
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leo
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Post by leo on Feb 12, 2009 19:26:40 GMT
The standard Buffalo is a decent performer, it has the potential to be taken much further IMHO with time and effort.
I'm very happy with how mines performing in its current state, it does not sound like other dacs I've tried
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Post by minivan on Feb 13, 2009 20:29:17 GMT
master leo, can u list the mods you did the the ivy output, and what change do those mod did to the sound. also what have u done to the buffalo beside upgrade to the shunt regulator
thanks
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leo
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Post by leo on Feb 14, 2009 0:33:12 GMT
My Buffalo was the version with wrong comparator so I changed it to the faster version.
The voltage buffer for the AVCC L & R was removed as its no longer used, the new separate regs replacing this gave a big boost in performance
I now use ERS material to shield the clock circuit, using the Buffalo too close to the IVY without shielding makes it pick HF noise
For the IVY
I use non magnetic resistors instead of the ones supplied, the magnetic ones sounded bright to my ears
I scrapped the Wima Bypass caps as they coloured the sound since fitting the new regulation, I now use PPS
I scrapped the Panny ECQ caps in the filter for PPS
The updated filter stage was fitted for the input which can be found on the diyaudio thread
Next thing I want to try is replacing the Buffalo's onboard SMD Panny FK caps with Polymer types, the new regs are dead stable and allow ultra low ESR caps on the output, these will supply the XO and Sabres supply pins
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Will
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Post by Will on Feb 26, 2009 11:30:16 GMT
Lifted from a post on the other site, posted by Brian Donegan, from Twisted Pear.
"The second generation Buffalo will actually change this a bit. We are planning to branch the Buffalo into two separate versions.
The standard version will be two channel, and incorporate two mono IVY II (enhanced version of the IVY) into the board. It will have S/PDIF, I2S and DSD inputs, like the current board. It will require an external supply for digital, and one or two external supplies for the analog stages (up to user). There are lots of upgrades from the first generation Buffalo, not just the chip.
The other version, which we refer to as the "tweaker" version, is still being designed. It will likely be more of a kit (though hole parts, etc), support 8 channels, no on-board regulators or output stage, and require more know-how to use. It will really be a development platform for the chip.
This is early information, so details may (will) change. Just a heads up."
This sounds quite interesting. A version for the DIY confident, that allows maximum tweaking, and a version for the less confident.
Hopefully the 'chip' only version will cost less, also.
I would also guess that the tweakers version will appeal massively to Leo, that if he doesn't already have one on the way ;D
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Spirit
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Post by Spirit on Mar 5, 2009 12:41:05 GMT
Mr T I just read the entire 31 page thread over at diyaudio... Didn't understand a word Well not many anyway. I like grotto... it has reviews. I think I shall build a 32S (the simpler stereo version) come the end of the year. (Got a trip to China in July, followed by need of a new pc...) |
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, what is it? 
