ODAC is out. You can order it either as standalone or built inside the O2. As far as the PSU goes if you check the designers blog he has provided a detailed information of the recommened PSU for his amp. I cannot share you the link due to head-fi ban on his blog but if you google it I am sure you will find it.
But again O2 is not the best sounding AMP out there, it is the best measuring amp in its price range and honestly a great buy if you can build it yourself. But when you buy it pre-built and than add the P&H there can be better 'sounding' amps out there than the O2.
But what made me keep the O2 is simply great engineering, and complete lack of HISS when turning the volume knob.
Sorry Audio,i meant the ODA (Objective Desktop Amp),a "Desktop" O2 version with no batteries and some more input -and/or output - options ,based on what John Seaber from JDS Labs. told me.
Unfortunately "who should not be named" is not giving much more info about when it will be released,but there should not be any big great sound improvement from the O2.Nonetheless i will wait some review when it will be on the market to have a chance to choose from those two.I wish i could build it by myself but i am very bad at soldering i will just throw out that money...but i don't deny i would like to try to build a second unit to get more knowledge about what each components do and how a simple amplifier basically make.
By the way along Head-Fi, his site is providing a lot of information and knowledge which is the reason i respect it very much.Unfortunately i am having some more important priorities and my geographical and economic position don't allow me to afford an hi-end amp and dac.
I was considering some amp-dac's like the Mini ,the Quattro and few more,but for 150 dollars ,at the moment ,is tempting me a lot because for that price many tell is a great sounding amp.
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The voltage of the power adapter is what is related to how hot the two voltage regulators in the O2 get, not the current. 14VAC is perfect, as is 500mA. The designer's listed power adapter recommend on his latest BOM (Dec 2, 2011) is 14 - 20VAC. Originally he had specified 12VAC which proved a little too thin in cases with the amp heavily loaded and the power mains voltage from the wall socket being on the low side. The upper 18VAC - 20VAC adapter voltage range is where the voltage regulators start getting a bit toasty.
As for current, anything from 200mA on up is fine for most headphones, or 400mA on up for low impedance + low sensitivity cans (the case that draws the most current). The O2 can push up to 140mA per channel, plus some chip and part quiescient current overhead to make it about 200mA per channel max, for a maximum current requirement of about 400mA total for both channels. There is an additonal techy issue of the adaptor's transformer core going into saturation on each power line cycle due to the current spikes caused by the double half wave rectifier setup the designer used in the O2 power supply. Probably doesn't make any audible difference, but to avoid that add about 20% to the adapter's current rating. That takes the it up from 400mA to around 500mA for O2 absolute max load current requirements, so what you've found there is just fine.
I use 16VAC + 400mA on two of my O2s and 16VAC + 1A (1000mA) on the other. Works great. I would have chosen 14VAC though if I could have found that combination in the US at Mouser at the time, to reduce the voltage regulator's heat dissipation a bit more.
Wow bro,you are really into it,congrats for your in sightings.Yesterday i did research all the principal "electric components shops" avenue in my town,and i did only found the adapter mentioned above..I don't know why ,but it is a strange power requirement indeed.Obviously i don't know much more cause i am more into Knives and Pans...I was almost convinced i would have to contact a personal made adapter,ahaha.Glad to know it is the proper PSU.Do you have three units...
What do you guys expect for the desktop version?If there will not be great difference in sound i maybe will try to buy the Trans-portable version due to his batteries capabilities feature.And hopefully if it wont cost too much..