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Building the O2 Headphone Amp | diyAudio
https://www.diyaudio.com/community/threads/building-the-o2-headphone-amp.217086/
Turn the amp on and the current should settle down to about 20 – 24 mA (or 6 – 8 mA for the Low Power version). If your DMM reads in amps, that’s 0.022 amps. Turn it back off, and repeat the test for the other battery (with the first battery reconnected). The current should be very close to the same.
O2 amp CRC, diode, cap, and heatsink mods | Page 6 | diyAudio
https://www.diyaudio.com/community/threads/o2-amp-crc-diode-cap-and-heatsink-mods.199530/page-6
O2 amp longer runtime #2, low power op amps from BOM RocketScientist's writeup on the O2 amp includes an option of using a set of low power op amps he specified for increased runtime. It seems the option has been largely forgotten or unused, since as RocketScientist wrote that the distortion and noise floor can be a bit higher, depending upon ...
The Objective2 (O2) Headphone Amp DIY Project | Page 3 ...
https://www.diyaudio.com/community/threads/the-objective2-o2-headphone-amp-diy-project.193977/page-3
What's really weird to me is FiiO essentially cloned the AMB Mini3 with their new E11 amp. Except instead of a 9 volt battery they used LiPoly and a DC-DC converter. The could have very easily made it a bipolar DC-DC converter as in the E9 and the amp would have 0 volt referenced inputs and outputs--i.e. a real ground. Instead, however, they ...
The Objective2 (O2) Headphone Amp - DIY Audio …
http://www.diyaudioblog.com/2012/01/objective2-o2-headphone-amp.html
The Objective2 (O2) Headphone Amp. People feel so strongly about audio reproduction that it often becomes akin to religion and politics and arguments ensue. Some listeners feel that a perfectly flat response curve and fully diminished THD levels (total harmonic distortion) are the holy grail, while there are others that enjoy the warm ...
The O2 Amp | Tubelab
http://tubelab.com/prototypes/o2/
The O2 Amp | Tubelab Tubelab Prototypes — The O2 Amp Experienced I have been reminded more than once on the DIYaudio forums that this design is NOT a true Ongaku. The true Ongaku was a very well regarded amplifier designed and built in Japan using hand built silver capacitors and transformers.
NwAvGuy: O2 Headphone Amp
https://nwavguy.blogspot.com/2011/07/o2-headphone-amp.html
The O2 is a fairly minimalist amp designed around the solid objective goals listed above, not subjective hype or audiophile myths (see: Subjective vs Objective ). It doesn’t aim to be “warm” by rolling off the highs, try to be “sweet” by adding a bunch of distortion, or alter the bass via a higher output impedance.
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