Will
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Post by Will on Apr 4, 2009 8:35:18 GMT
Leo,
I've been re-reading this thread, and the one on AOS, and noticed that you powered the IVY board from +/- 15v Paul Hynes regulators.
Did you try powering the IVY board from a 'standard' LM317 PSU, via the JLH PSRR? and if so, what was the difference?
Cheers.
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Spirit
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Post by Spirit on Apr 4, 2009 9:03:48 GMT
Did you try powering the IVY board from a 'standard' LM317 PSU, via the JLH PSRR? and if so, what was the difference? He's a thinking man, this one ;D I may well go down the same route, depending on the answer...  |
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leo
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Post by leo on Apr 4, 2009 10:38:53 GMT
I've never actually tried the JLH's with the IVY yet, I started with TP based LM317/337's (which I found did not bring out the full performance)
Using this implementation I always felt the Buffalo had much more to give
I then tried Teddy regs which are VBE based, I did not like these in this particular application, the higher output impedance probably did not go well
The bass was soft, the sound lacked focus
I tried ALW's, this sounded the best so far, they was a little bright at times which I think was caused by the low ESR panny FM caps bypassed with films, ALW super regs can be touchy with low ESR and higher capacitance on the output, lowering the capacitance made bass thin, it also sounded even brighter
I messed about with the wiring, caps etc
The Paul Hynes regs gave me a shock, I first tried his shunt regs for the IVY because these are the easiest thing to change.
These things sounded so good I didn't bother faffing about trying anything else because I was happy.
I then replaced the Buffalo's onboard 3.3v , 1v2 and the important L & R AVCC regulation with PH shunts
A JLH should improve the standard TP LM317/337 regulation for the IVY, I might try this combo just to see what its like.
Anybody else with a Buffalo and standard TP regulated supply should also try it, I'm sure it'll improve things
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Will
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Post by Will on Apr 4, 2009 12:31:50 GMT
Thanks for the feedback, Leo.
I'm ready to pull the trigger on one of the new 32S when released (and ready to face the wrath of wife!) and my initial thoughts are to feed the analog L/R supplies with a JLH PSR and the digital fed a straight DC supply.
I'd concentrate on improving the local supplies on the DAC using the hynes regulators, having being inspired (copying?) you and your buffalo, after.
Hopefully TP will be posting the schematic, which'll help future mods.
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robertkd
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Post by robertkd on Apr 4, 2009 12:58:17 GMT
huh, posted here by mistake  |
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leo
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Post by leo on Apr 4, 2009 15:35:14 GMT
Thanks for the feedback, Leo. I'm ready to pull the trigger on one of the new 32S when released (and ready to face the wrath of wife!) and my initial thoughts are to feed the analog L/R supplies with a JLH PSR and the digital fed a straight DC supply. I'd concentrate on improving the local supplies on the DAC using the hynes regulators, having being inspired (copying?) you and your buffalo, after. Hopefully TP will be posting the schematic, which'll help future mods. I'm interested to know how the new version is going to compare against my modified older version, if the price isn't way too high for the new Buffalo expect a shoot out |
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Will
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Post by Will on Apr 4, 2009 16:19:40 GMT
Crikey, TP have posted the price of the new Buffalo 32S on their site.
$469 for the standard board, which includes IVY2.
Thats £317 or AU$660.
I haven't squirrelled enough away yet, so will probably wait this round out, and see what the next round brings, or maybe the minimal board that is in the works.
Time to get the JLH's made for the cheapo DAC!
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leo
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Post by leo on Apr 4, 2009 20:11:38 GMT
Bloody hell! I'm not going to be rushing to try that  With added regulated psu's thats going to be pricey, little too much just to try out, tbh I'm happy with what I have Give the JLH's a try Will with the Cheapo, may prove good? |
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Post by PinkFloyd on Apr 4, 2009 21:33:46 GMT
If you're a right penny pinching bugger then pick up a secondhand Marantz CD52MKllSE from ebay ;D
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robertkd
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Post by robertkd on Apr 5, 2009 0:30:31 GMT
huh, posted here by mistake If you are referring about my post on the HeadRoom DAC, NO. I posted it on purpose since it uses the ESS DAC. not at all Miguel,, one of my responses ended up here by mistake Robert |
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pagan
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Post by pagan on Apr 5, 2009 3:28:43 GMT
Crikey, TP have posted the price of the new Buffalo 32S on their site. $469 for the standard board, which includes IVY2. Thats £317 or AU$660. I haven't squirrelled enough away yet, so will probably wait this round out, and see what the next round brings, or maybe the minimal board that is in the works. Time to get the JLH's made for the cheapo DAC! Bit too much for me too. What's the minimal board? Hopefully without the onboard I/V. |
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Post by Deleted on Apr 5, 2009 4:36:48 GMT
Allan I wonder if they have quantity discounts ?  |
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pagan
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Post by pagan on Apr 5, 2009 5:23:24 GMT
Leo "I'm interested to know how the new version is going to compare against my modified older version, if the price isn't way too high for the new Buffalo expect a shoot out [/quote]" www.diyaudio.com/forums/showthread.php?postid=1794087#post1794087As per Russ's response. interesting as to what drive capabilities this dac has Allan |
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pagan
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Post by pagan on Apr 5, 2009 5:26:35 GMT
Allan I wonder if they have quantity discounts ? Alex I doubt it. But the Tweakers version sound interesting. Allan |
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Will
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Post by Will on Apr 18, 2009 9:02:37 GMT
First batch went on sale last night, and went in less than a minute!!
Next (and last) batch goes in a couple of hours.
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leo
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Post by leo on Apr 18, 2009 10:10:32 GMT
Me mate managed to bag one so I should get chance to try it out less than 10 seconds before they was all gone. Bit of advice guys, the tweakers version does sound interesting but tbh I think I'd now go for this full version and feed it nice regs, you'll be struggling to better those OPA1632's in the input differential stage imo, I like the fact these are now used in the output too, the SMD parts should make them more stable. I know a few people who had problems with noise (me included to start with) when using the separate wired IVY and Counterpoint |
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Post by Deleted on Apr 18, 2009 11:22:15 GMT
Me mate managed to bag one so I should get chance to try it out less than 10 seconds before they was all gone. Bit of advice guys, the tweakers version does sound interesting but tbh I think I'd now go for this full version and feed it nice regs, you'll be struggling to better those OPA1632's in the input differential stage imo, I like the fact these are now used in the output too, the SMD parts should make them more stable. I know a few people who had problems with noise (me included to start with) when using the separate wired IVY and Counterpoint Leo After experience with the LM4562 HA and it's better thermal management, and the fact that the normal LM4562 sounds better with some kind of heatsinking, I think they are nobbling audio for future generations with pissy little SM opamps and their very hot dies inside them. Care to try heatsinking a SM LM4562 ? Alex |
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leo
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Post by leo on Apr 18, 2009 11:50:57 GMT
opa1632 has its die ,thermal pad on the bottom of the chip which should be soldered to a large copper pad on the pcb
I hope TP are making use of this, tbh if the op-amps are dead stable they should run much cooler
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robertkd
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Post by robertkd on Apr 18, 2009 13:37:35 GMT
opa1632 has its die ,thermal pad on the bottom of the chip which should be soldered to a large copper pad on the pcb I hope TP are making use of this, tbh if the op-amps are dead stable they should run much cooler Leo what an interesting device the OPA1632 is mmm how to ultiise this to it's potential anyone for a fresh bush baby their yummy but not terribly cooperative ;D Robert |
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leo
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Post by leo on Apr 18, 2009 16:16:11 GMT
For a differential circuit these are hard to beat
GBW, slew,noise are better than most with a healthy output current drive capability
Can go unstable without care in circuit layout though
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Will
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Post by Will on Apr 18, 2009 20:16:28 GMT
Leo, what you said about the combined Buffalo32s vs. the tweakers version matches my thoughts with what I've read else where.
I'm not far from 'accruing' enough to buy a Buffalo 32s in the next batch, and although I realise that the choice of PSU make the DAC, I'm very interested in your thoughts when you get a listen to your mates 32S.
BTW, can you remember who delivered your Buffalo? I heard that there is less chance of getting hit by import duty, if Royal Mail don't do the delivery. I'm a bit concerned about having to pay up on the £300+
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leo
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Post by leo on Apr 18, 2009 22:01:44 GMT
Leo, what you said about the combined Buffalo32s vs. the tweakers version matches my thoughts with what I've read else where. I'm not far from 'accruing' enough to buy a Buffalo 32s in the next batch, and although I realise that the choice of PSU make the DAC, I'm very interested in your thoughts when you get a listen to your mates 32S. BTW, can you remember who delivered your Buffalo? I heard that there is less chance of getting hit by import duty, if Royal Mail don't do the delivery. I'm a bit concerned about having to pay up on the £300+ Hi Will, I'll be sure to post impressions soon as its here and up and running I'll try it with TP based regs first and compare against my PH regged original Buffalo I was at work when mine arrived, I never got had with import duty so may have been lucky |
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Will
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Post by Will on May 16, 2009 7:19:36 GMT
Well, the first Buffalo 32S are out in the wild, and the only indications on SQ/musical performance seem to be 'good' and 'tastes nice'
Anybody seen anything a bit more descriptive?
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robertkd
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Post by robertkd on May 16, 2009 7:26:34 GMT
Well, the first Buffalo 32S are out in the wild, and the only indications on SQ/musical performance seem to be 'good' and 'tastes nice' Anybody seen anything a bit more descriptive? Will, i guess from that, if you don't like it you can always eat it Robert |
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Spirit
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Post by Spirit on May 16, 2009 8:27:50 GMT
Robert... it would want to last for a month of sundays, and be the best tasting meal ever, for the price |
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