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-   -   XMOS-based Asynchronous USB to I2S interface (https://www.diyaudio.com/forums/digital-line-level/188902-xmos-based-asynchronous-usb-i2s-interface.html)

randytsuch 25th March 2012 04:27 PM

Quote:

Originally Posted by qusp (https://www.diyaudio.com/forums/digital-line-level/188902-xmos-based-asynchronous-usb-i2s-interface-post2959365.html#post2959365)
umm every lifepo4 battery ive used is 3.3v nominal as its normal voltage. at fully charged it will be 3.6 but this drops to 3.45 very quickly and spends the rest of its charge between 3.45 and 3.2 before falling off a cliff, which is where you should cut it anyway. so you dont really need a regulator as generally most parts will allow this much tolerance in the supply as long as its steady

In general, I thought most parts were +/-5% of 3.3v, for operating voltage range. IOW, voltage range min of 3.135V to max of 3.465V. They usually have a higher absolute max voltage, but I would not want to hit the absolute max voltages.

Randy

qusp 25th March 2012 05:59 PM

easy enough to deal with, ive never had any problem charging to full because under load the drop from 3.65 down to 3.45 takes a matter of a couple of minutes generally. sometimes they will fall down to this n their own. if you really worry just charge them to 3.45, as thats about 95% full minimum

qusp 25th March 2012 06:11 PM

no they cant; well not as loose cells as this is against the reseller agreement and they would lose their resellers rights, maybe old or rebadged, but certainly not new stock. ive been using these batteries for years and yes i frequent the RC forums (like RC groups which is probably where you are talking about and they sell the levinpower cells i mentioned) as thats where i found out about them, not audio and i use a cellpro 10XP 10 cell RC fast charger. you find rebranded, which are NOT legit, but rather grey market cells, sometimes rejects. but the ANR26650m1B has been out for quite a while now and nobody sells them online still because they havent been faked or hit the used/rejected state yet.

believe me, i buy from a legit reseller, there are no legally rebadged, or legit single cells for sale. you can buy the A123 racing packs which are welded but that is the only way apart from through industry that you can buy them legit. many claim all sorts of things, but they are stretching the truth. the power tools packs and RC packs are still the old ANR26650A as well afaik. i'm been saving a bit of coin to buy some of the prismatic cells, even lower impedance, MUCH higher power capability (1200W) as if that was needed and much higher capacity 19.6Ah vs 2.3 (anr26650m1A (old cells)) or 2.5Ah (anr26650M1B new cells) about $100 a pop for the prismatic AMP20M1HD-A

Wolfsin 25th March 2012 06:23 PM

Go L!
 
By posting a 'ready for production' product on a diy forum Lorien has received much help that may be useful during a design review of a basicly diy product. WaveIO is extremely well 'positioned' as a stereo audiophile product whose allowance for external power drives jitter to extremely low levels, chiefly because GMRs are evil.

In addition, his product can be used by every popular personal computer supporting USB and having sufficiently short DPC latency to avoid buffer under runs. The effect of an under run is, in any case, only a short pause in the music, not a system crash.

Given that WaveIO sits near the juncture of digital and analog it brings forth an unusual mixture of readers, some with in-depth expertise on one side or the other but rarely on both. My sympathy goes out to Lorian (a.k.a. Lucien) partly because I once developed a product that was purchased by thousands of users, some of whom were not sophisticated enough to utilize it properly. My satisfaction guarantee and personal tech support kept the return rate way below 1% and required less than an hour a week of my time. That was in 1985.

The situation is much more dificult today, in part because ease of use has amplified the Dunning-Kruger effect with personal computer market penetration approaching ubiquity. I take my hat off to 'L' for his product positioning, excellence in production, and calm demeanor in this thread.

robertopisa 25th March 2012 07:33 PM

I see gusp your point, I'm not in the market.

My question: where can I buy top-notch rechargeable batteries at 3.3V?

You suggest me batteries that only NASA can buy :-)

-Roberto

P.S. Maybe this has become OT, maybe it is useful also for the WaveIO (5V)

Quote:

Originally Posted by qusp (https://www.diyaudio.com/forums/digital-line-level/188902-xmos-based-asynchronous-usb-i2s-interface-post2959925.html#post2959925)
no they cant; well not as loose cells as this is against the reseller agreement and they would lose their resellers rights, maybe old or rebadged, but certainly not new stock. ive been using these batteries for years and yes i frequent the RC forums (like RC groups which is probably where you are talking about and they sell the levinpower cells i mentioned) as thats where i found out about them, not audio and i use a cellpro 10XP 10 cell RC fast charger. you find rebranded, which are NOT legit, but rather grey market cells, sometimes rejects. but the ANR26650m1B has been out for quite a while now and nobody sells them online still because they havent been faked or hit the used/rejected state yet.

believe me, i buy from a legit reseller, there are no legally rebadged, or legit single cells for sale. you can buy the A123 racing packs which are welded but that is the only way apart from through industry that you can buy them legit. many claim all sorts of things, but they are stretching the truth. the power tools packs and RC packs are still the old ANR26650A as well afaik. i'm been saving a bit of coin to buy some of the prismatic cells, even lower impedance, MUCH higher power capability (1200W) as if that was needed and much higher capacity 19.6Ah vs 2.3 (anr26650m1A (old cells)) or 2.5Ah (anr26650M1B new cells) about $100 a pop for the prismatic AMP20M1HD-A


qusp 26th March 2012 05:15 AM

well you can buy the official A123 racing RC packs that are 2 of the old type welded together in series and either make a matching connector that uses them in parallel, or cut the welds. or you can buy some of those levinpower ones at RC groups (cant remember the actual shops name ATM) which do appear to be either old, stolen or diverted last gen A123 and just charge to 3.45. they'll work and from reports the levinpower ones are actually quite good, but they arent officiel rebadged A123 as claimed; thats all I was saying and i would stay away from buying things that claim to be official A123 on ebay. also i can probably put you in contact with my source, i just cant post here and you'll probably have to buy 10.

its borderline OT, but i dont really think this post is, we are discussing alternate power sources for WAVE IO.

robertopisa 26th March 2012 06:01 AM

Thank you qusp
-Roberto

Quote:

Originally Posted by qusp (https://www.diyaudio.com/forums/digital-line-level/188902-xmos-based-asynchronous-usb-i2s-interface-post2960397.html#post2960397)
well you can buy the official A123 racing RC packs that are 2 of the old type welded together in series and either make a matching connector that uses them in parallel, or cut the welds. or you can buy some of those levinpower ones at RC groups (cant remember the actual shops name ATM) which do appear to be either old, stolen or diverted last gen A123 and just charge to 3.45. they'll work and from reports the levinpower ones are actually quite good, but they arent officiel rebadged A123 as claimed; thats all I was saying and i would stay away from buying things that claim to be official A123 on ebay. also i can probably put you in contact with my source, i just cant post here and you'll probably have to buy 10.

its borderline OT, but i dont really think this post is, we are discussing alternate power sources for WAVE IO.


carsten.witt 26th March 2012 06:06 AM

Hello,
@qusp, thanks for your remark ...
Quote:

Originally Posted by qusp (https://www.diyaudio.com/forums/digital-line-level/188902-xmos-based-asynchronous-usb-i2s-interface-post2959660.html#post2959660)
I was about to say the same thing; using such expensive high performance regulators and leaving long leads and a connector between them and the load will destroy all benefit of having them. I would get rid of the connector and hard wire them as well.

Yes, it comes in the "final version", this is only my playground.

@triode_al,
thanks for these hint
Quote:

Originally Posted by triode_al (https://www.diyaudio.com/forums/digital-line-level/188902-xmos-based-asynchronous-usb-i2s-interface-post2959707.html#post2959707)
Carsten
Why is this? I had the impression one would like optimum isolation between power domains. . as that is said to reduce jitter-induced distortion.
The isolator behaves pretty well I understand. (there was a post on that).

Oh, that i misunderstood these post (my english is not the best), i will search again for these post.

Quote:

Originally Posted by triode_al (https://www.diyaudio.com/forums/digital-line-level/188902-xmos-based-asynchronous-usb-i2s-interface-post2959707.html#post2959707)
[That is why I would expect an isolator on the USB input, but that is just my rambling].

I have tried the "ultravox" from diyparadise.com (USB Isolator based on Analog Devices' ADUM4160.), but then the mac down't recognized the WavIO anymore.
yeo think that the ADUM4160 can only 16/44.

@all,
does anybody knows another chip that can handle more?

Ryelands 26th March 2012 01:55 PM

Quote:

Originally Posted by carsten.witt (https://www.diyaudio.com/forums/digital-line-level/188902-xmos-based-asynchronous-usb-i2s-interface-post2960428.html#post2960428)
does anybody knows another chip that can handle more?

The "circuits@home" board using the ADuM4160 chip definitely works at 96KHz on a Mac. See post 262 and others here:

http://www.diyaudio.com/forums/group...ml#post2359638

where some Mac-related issues are discussed. Worth a quick look, perhaps.

While I'm here, how can I order a WaveIO board?

Lorien 26th March 2012 02:09 PM

I'll contact you shortly by PM letting you know details about WaveIO.
Cheers,
L


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