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The Objective2 (O2) Headphone Amp DIY Project | diyAudio
https://www.diyaudio.com/community/threads/the-objective2-o2-headphone-amp-diy-project.193977/
The power supply is a huge part of the O2's low cost performance. A real ground always beats a virtual ground. And the half-wave AC supply might seem "cheap and dirty" but properly engineered it works as well as any other AC power supply in this application. The proof is 131 dB of S/N and 0.0009% THD on battery or AC power.
The Objective2 (O2) Headphone Amp DIY Project - diyaudio.com
https://www.diyaudio.com/community/threads/the-objective2-o2-headphone-amp-diy-project.193977/page-3
Thanks for the compliments. What ultimately matters is how long the period is between the op amps going unstable and the 220 uF caps gasping out their few remaining electrons into the headphone load. And your sim shows both rails are way down by the time that happens. It's also worth pointing...
The Objective2 (O2) Headphone Amp DIY Project - diyAudio
https://www.diyaudio.com/community/threads/the-objective2-o2-headphone-amp-diy-project.193977/page-12
speaking of using mobiles with the O2, have you done any testing wrt RFI noise immunity? in particular response to the location signal chirp put out just before a call or message comes in, or when changing towers (or switching from 3g service to some other service in black spots) this is a problem with many portable amps and i believe has more to do with the input …
O2 grounding help | diyAudio
https://www.diyaudio.com/community/threads/o2-grounding-help.286059/
It's coming from the odac because the O2 is dead silent when disconnected. Also, I briefly plugged my headphone directly into the odac with nothing playing and the static was there in the right channel. When I googled this, there are actually quite a few reports about the right channel having static but there was never an answer.
The Objective2 (O2) Headphone Amp - DIY Audio …
http://www.diyaudioblog.com/2012/01/objective2-o2-headphone-amp.html
The PCB files are open source and circulated freely; users are encouraged to arrange group-buys on forums such as DIYAudio.com in order to procure the board and/or the front panel. Also, as of this writing, JDSLabs is offering both the O2 board and a unique front panel (to see the JDSLabs CMoyBB being built, please see my previous post). The ...
NwAvGuy: O2 Headphone Amp
https://nwavguy.blogspot.com/2011/07/o2-headphone-amp.html
O2 on diyAudio – This is the best place for the DIY crowd to discuss building the O2, creative enclosures, add-ons, etc. O2 on ABI – AnythingButiPod is a great friendly site and it’s the best place for non-DIYers to discuss the O2. The more hardcore DIY …
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