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Post by Deleted on Oct 3, 2008 3:43:45 GMT
minivan
What I know about kit type DACs could be wriiten on the back of a postage stamp.
"Pagan" is the Sydney member who is pretty knowledgeable in this area. (seriously!)
Alex
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Spirit
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Post by Spirit on Oct 3, 2008 5:49:28 GMT
minivan What I know about kit type DACs could be wriiten on the back of a postage stamp. "Pagan" is the Sydney member who is pretty knowledgeable in this area. (seriously!) Alex In size 0.1 print, right?  |
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rickcr42
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Post by rickcr42 on Oct 3, 2008 6:04:32 GMT
Just a thought : From two days ago : Quote: Two DACs that interest me at the moment are the Buffalo DAC, based on the new ESS chipset www.twistedpearaudio.com/digital/buffalo.aspx, which I think Leo is getting,[quote} My response : All the evidence suggests the ESS chipset is the real deal and considering it is damn near a self contained DAC would be mighty hard to screw up (though some will try in the name of "improving" it ) so should be a good choice for one considering a new DAC.
It has been a while since I visited the ESS data files but from memory I beleive I would just toss it in a box with a good power source and using the voltage output go direct to the out jacks via a 1:1 line transformer in BAL to SE mode keeping the essence of the design unchanged rather than try and reinvent the wheel this from another site,posted by a very well known hugh end equipment designer : ___________________________________________________ Rio, I love it... it sounds great, it's flexible. You do have to turn the automute off or you will loose the first bit of each piece if there is allot of lead in 0's between songs. I took the easy way out... used a transformer for the voltage to single ended route. I did design a differential i/v conversion but never got around to trying it out. Remember people the i/v is not referenced to ground but 1/2 of analog supply. Thanks Gordon _________________ Gordon Chief Scientist Wavelength Audio ____________________________________________________ from this thread ; www.diyhifi.org/forums/viewtopic.php?f=2&t=1607notice he chose the passive route which when possible is always a good option but even so,take note of the method required if using a discrete IV stage and how it is referenced |
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leo
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Post by leo on Oct 3, 2008 12:46:07 GMT
Its proving to be an interesting dac Rick, I've heard a huge range of diy and commercial based units and this thing doesn't sound like anything I've heard before, hard to explain tbh
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rickcr42
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Post by rickcr42 on Oct 3, 2008 18:29:44 GMT
on paper and going by everything I can read on the reviews it seems to be something truly different from what has gone before (in a good way) with the plus of there are apparently ZERO format limitations so possibly the DAC has finally arrived as a grown up technology FOR grownups ? Nice to see a truly new thing for a change rther than same old with a twist |
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leo
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Post by leo on Oct 3, 2008 18:53:43 GMT
I'm not convinced the IVY is getting the most out of it either but it seems fine for getting it up and running
I want to also get that crystek oscillator its own supply which I'll sort out later
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rickcr42
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Post by rickcr42 on Oct 3, 2008 21:10:33 GMT
Other possibles would be the PS refernced at the Tent Labs site for powering the XO or,one of my favs for digital power-an LDO followed by a Wenzel "cleanup" shunt |
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leo
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Post by leo on Oct 5, 2008 10:29:53 GMT
Thanks Rick, I'll have to knock a few idea's up onto vero board and see how they compare Its currently used in 2 x cases whilst testing so excuse wiring  The flea at the bottom isn't currently in use although its tested and ready to go, just need a 80mhz XO  |
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rickcr42
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Post by rickcr42 on Oct 5, 2008 16:45:32 GMT
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leo
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Post by leo on Oct 5, 2008 18:59:27 GMT
Nice, ta Rickster!
Simple and easy too, especially the low current version
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Post by minivan on Oct 24, 2008 20:10:51 GMT
got my buffalo running, my first diy project and it work   i can't get the lcbps regulated psu running. currently using the psu from the jaycar headamp kit, which is not ideal. 0 reading on the +side of the lcbps no matter how i turn the trimpot. twisted pear suggested to replace the transistor lm317, i touch the heat sink on the lm317 is as warm as the heatsink of the lm337 so i assume it's not faulty? any1 got any suggestion? more info on the lcbps www.twistedpearaudio.com/power/lcbps.aspx |
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Deleted
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Post by Deleted on Oct 24, 2008 23:11:52 GMT
minivan
Did you measure the voltages out of the PSU before connecting it to the load ? If the output is faulty,with no load connected, take some high quality photos of the PSU so that we can see the component markings etc.An underneath view would also be helpful. If you don't wish to post a lot of photos, send them to me in an email, and I will see that the usual small group gets to have a look at them, and offer suggestions/remedy.
Alex.
P.S. Click on "sandyk" and choose the email option instead of PM. My email address is not hidden.
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Post by minivan on Oct 25, 2008 10:37:57 GMT
alex, i have to adjust both the +/- output to 15v b4 connected to the ivy (output stage broad), so no load when i measure the voltage no voltage on the + side with lm317, -side is all good with lm337 here's some shots of my psu, best i can manage with my cam i am pretty sure i have all connection done right, and all solder join are good,    layout and schematic of the psu is here www.twistedpearaudio.com/power/lcbps.aspxsome1 seem to have the same problem as i have here, but it's on the -side www.twistedpearaudio.com/forum/default.aspx?g=posts&t=381 |
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Post by Deleted on Oct 25, 2008 11:50:11 GMT
minivan
I have sent you an email.
Alex
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leo
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Post by leo on Oct 25, 2008 12:14:09 GMT
Those plastic trimpots are really delicate , there even may be a faulty batch, I noticed somebody else had the same problem
only other thing to try is remove the trimpot and replace with a fixed resistor in the right value for setting the voltage needed
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Post by Deleted on Oct 25, 2008 12:27:51 GMT
Minivan
Only when I read right through the Twisted Pear thread, did I realise that you had the VREGs around the wrong way initially. You may have blown up the LM317T the first time.
If you haven't done so already, try replacing the LM317T. They are only $2 each at Jaycar.
Alex
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leo
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Post by leo on Oct 25, 2008 12:42:13 GMT
Minivan Only when I read right through the Twisted Pear thread, did I realise that you had the VREGs around the wrong way initially. You may have blown up the LM317T the first time. If you haven't done so already, try replacing the LM317T. They are only $2 each at Jaycar. Alex Guys,its best to add any details including any errors that may have been done, it helps with isolating things |
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Post by minivan on Oct 25, 2008 20:44:04 GMT
using a multimeter checking each connection one by one, find out one of the solder point on the choke is not done properly, all is well and working now. thanks leo and alex for all the encourage and support on this forum diy is so much fun! now onto my next project , jaycar headamp |
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Post by Deleted on Oct 25, 2008 21:03:26 GMT
minivan
You already have the PSU up and running ! Go get 'em !
Alex
P.S. Was the joint that I highlighted in the picture, the choke ?
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Post by minivan on Oct 25, 2008 21:26:51 GMT
alex, the choke is the square litttle thing between the 2 10r resistor u highlighted
ur email made me decided to recheck all solder point.
doing my jaycar headamp solder work now, those kit seem to sell well. got the lucky last in the store i went to.
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Deleted
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Post by Deleted on Oct 25, 2008 22:06:15 GMT
minivan
Does your HA kit have green solder masking on the track side of the PCB? If so, it is one of the later versions that were recently released. The earlier versions permitted the possibility of solder splashes between tracks causing problems, which just means far greater care needed when soldering.
Alex
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Post by canjunkie on Oct 26, 2008 11:11:09 GMT
Minivan, You're right about the headamp, although its not indicated as such on the website, its out of stock until the end of October  |
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Spirit
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Post by Spirit on Nov 11, 2008 2:44:38 GMT
Leo, have you any further thoughts on the Buffalo? Quite tempted to build one after my SCHA...  |
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Post by Deleted on Nov 11, 2008 2:54:17 GMT
spirit I think that Leo may still be too busy listening via his Buffalo to spend much time here ! Alex |
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Spirit
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Post by Spirit on Nov 11, 2008 3:04:01 GMT
I think that Leo may still be too busy listening via his Buffalo to spend much time here ! That's exactly what I wanted to hear |
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