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O2 AMP + ODAC - Page 121

post #1801 of 3771
Quote:
Originally Posted by a_recording View Post

Has anyone in this thread with a Mac with USB 3 ports or Mavericks encountered any problems with their ODAC? I recently got a new iMac and have been experiencing glitches and pops on the oDAC (which works fine when plugged into a Win 8 computer). I exchanged the iMac for a new one hoping it was a hardware issue, but the new one gets glitches as well. :/
It's probably a problem with Mavericks actually.
Quote:
Originally Posted by mrspeakers View Post

Mavericks has really trashed my audio IO. Just getting things stable again...

Yet another reason to not upgrade. XD
post #1802 of 3771
Quote:
Originally Posted by miceblue View Post

Yet another reason to not upgrade. XD

 

LOL. Nice to know, I will be holding the upgrade for a while.


Edited by Ashade - 11/18/13 at 7:55pm
post #1803 of 3771

+1 joining this club with a Mayflower O2+ODAC combo (rear power jack, low gain option)

 

not the newest or shiniest model but it'll do for a transportable unit i can take to work. replacing a Soundblaster MP3+ that i've had for a decade or so

 

couldn't decide between the many different dac/amp options out there, this fits the bill, and the designer seems to know his stuff. interesting story behind it, and what happened here (hmm..)

 

checked off all the things i was looking for:

- all in one unit, somewhat compact

- metal chassis preferred

- no drivers needed

- low impedance output, works good with 32ohm phones

- external power preferred

- decent usb / dac / amp components

 

that last item, the O2 seems to have bottom-dollar parts but measurably good performance so i'll just not worry about it

 

i'm not clear on why it needs AC input instead of DC like everything else.. but ok. ordered a couple of the Triad 16v / 400ma units from Mouser

post #1804 of 3771

You can read about why an AC to AC adapter is used on the designers website under the O2 Design Process area. We cant provide u the direct link here.

 

Basically there are several choices, but take a look over there and if you still dont understand why you can PM me.

 

Thanks

A.

post #1805 of 3771
Quote:
Originally Posted by adydula View Post
 

You can read about why an AC to AC adapter is used on the designers website under the O2 Design Process area. We cant provide u the direct link here.

 

Basically there are several choices, but take a look over there and if you still dont understand why you can PM me.

 

Thanks

A.

 

Appreciate your offer. I looked at design process but it's over my head. What I understand is, it's best for this design, and there's good science behind that. Good enough for me. :)

post #1806 of 3771

Many of the AC to DC adapters have noise issues and one way to get rid of that is to go with a AC to AC adapter, and do the AC to DC conversion yourself.

 

Many people think that AC power is "dirty or bad" and go thru some fairly expensive "solutions" to clean up or minimize their perceived beliefs that AC power is an issue etc....long debates....LOL.

 

The neat thing with that is all you have to do is run the O2 amp on batteries alone, NO AC, no ripple, no possibility of noise from the power source...just PURE DC, exactly what the doctor ordered.

 

With a simple unplug of the AC adapter you can see for yourself if there is any impact on running with the AC adapter or just with batteries (Pure DC).

 

The designer has measurements with AC power on his site...and they are exceptional.

 

Another reason why this little amp is such a marvel....

 

All the best

Alex

post #1807 of 3771

The main reason why the O2 uses an AC-AC adapter instead of an AC-DC one (which are more common) is that it needs a dual +/- 12 V power supply, and that is not possible with most AC-DC adapters without using a rail splitter/active ground that the designer wanted to avoid. With AC power input, it is easy to create a dual DC power supply using two simple half-wave rectifiers.

post #1808 of 3771

All I want now is for someone to do a Full-On O2 Desktop Amp. Seems this product is definitely dead in the water for whatever reason.

 

1/4 and 1/8 jacks x 4 (yes, let it run at least 2-pairs for you and a friend)

 

1-3 watts max output

 

Keep the battery power for power outages? Lol. If there is a battery(ies) some kind of 'low charge' warning.

 

Variable Gain

 

1/8 in / RCA in

 

Better cable management

 

$200 or so (preferable less).

 

Done, I'll take three.

post #1809 of 3771

Add to that the approach of integrating the AC-AC transformer inside the enclosure would have created issues of shielding the noise from the sensitive electronics inside the case.  Not to mention the can of worms of various safety type approvals in order to sell the product in various markets, an external AC transformer was the easy cost effective solution.

 

I actually went a step further and created my own little power supply box with a small toroid to feed mine, total overkill but hey why not..

post #1810 of 3771

mateohead...if you haven't already check out the DIYaudio site under headphone amps...lots of discussion and updates to the O2 good or bad depending on your view...

 

AGDR is a person that is leading the way over there now for this amp...

 

FYI

 

Alex

post #1811 of 3771

I don't believe my particular model can run on batteries due to the ODAC being in their place (ok for my purpose). 

 

so, AC to AC adapter because

- circuit design needs a dual +/- 12 V power supply

- AC power input makes it easy to create a dual DC power supply using two simple half-wave rectifiers

- external transformer is a cheap and effective solution

- an internal AC-AC transformer would cause noise, need sheilding

- it makes the magics happen (hah)

 

Thanks adydula, stv014 & mcandmar! :beerchug:

post #1812 of 3771

Yup.....u can get the ODAC and the batteries in a case, but the small original case makes this a challenge...but it can be done.

 

or get a larger case...

 

or be happy with what you have got!!

 

Its pretty darn good!

 

Alex

post #1813 of 3771

Triad power supplies from Mouser arrived today. now i'm waiting on the O2+ODAC unit coming from Australia (purchased here, a classified ad). i think this particular amp has a lot of miles on it, from USA to AUS and back. 

 

somehow it's possible to ship from The Island to Kansas, USA for $14. amazin!

post #1814 of 3771

What are peoples thoughts on using o2+odac combo to drive Beyer T90's and EarSonic SM64's?

 

I've been doing some googling and haven't quite found an answer - but wasn't there meant to be a ODA (desktop amp), whatever happened to this concept?

 

Cheers fellas.

post #1815 of 3771

I use the O2 and ODAC with T90's all day long....

 

one word "EXCELLENT"...

 

Alex

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