The Objective2 (O2) Headphone Amp DIY Project

[sofaspud]

How can both statements be true? Clearly you lack the ability to understand subtle phrasing of meaning. "Required" != "recommended".

I understand it clearly. If you think there is a contradiction, consider the possibilities until you find the one that doesn't contradict.

[Alexium]

Originally Posted by RocketScientist

See:

Circuit Board Construction

Thank you! of course, I read the "Construction" section. In fact, I read the whole blog entry more than once. But I still don't feel confident enough (for one, I'm not sure I have identified all the components correctly, I'm used to soviet components and not quite familiar with the modern European ones). I was hoping someone has composed the instruction like "put the piece A into the hole B"

[RocketScientist]

@Willikan, thanks for sharing! That's the first one I've seen with RCAs on the front which cuts down on panel costs. I use that audio grade glue sometimes too. Good stuff!

[Jokener]

@Alexium: It is really easier than you think.
You start with the resistors and Diodes.
To find out what color codes on the resistors relate to what values, use an online tool.
The diodes are easy, just go by the quantity used.
Then the small caps (go by quantity, lead spacing and pictures... Mouser and Google are great).
Then the DIP-8 sockets and everything else, they should all be self-explanatory when consulting the PCB and the BOM.

Its really smooth sailing. I was surprised myself.

Best regards,
Jokener

[cheapskateaudio]

Originally Posted by qusp

CSA really is an insane person. ignore the troll he changes his story, changes his thoughts, changes his words; all in an effort to gain a reaction

I change my thoughts, my words, my story? Why does this make one insane? Things change, new ideas, new facts, these things adjust perception, unlike you I'm trying to find the TRUTH, and not live according to DOGMA like some folks around here who get all kerfluffled when their dogma is challenged.

[timpert]

Alexium:

I was hoping someone has composed the instruction like "put the piece A into the hole B"

I have just started writing something like that. I think a first version should be ready after the weekend, to be reviewed here.

@ Jokener:

Construction might seem daunting, so people might get increased confidence from a step-by-step description, so that they actually see that it is not such a big deal before diving into the deep.

[ethanolson]

CSA, et al., several years ago I used to get myself caught in "communication" traps and dug myself in deeper all the time trying to find stuff to back up my position. That tactic is best suited to talk radio. Now I just don't get emotionally invested in problems I'm trying to work out (including personal attacks) and things are much better because of it.

There's hope yet. Just give it time and realize the wisest among us are those who don't mind learning and taking correction even from the harshest of people.

I'd love to make changes to the O2 as well, but I don't know if any would make it "better." Better for more cost and complexity isn't always better, is it?! I personally would much prefer to have it built to run on 4 AA eneloop 1500 batteries. The power circuit would really have to change and maybe not for the better.There's only one way to find out.

[konga]

Well this weekend I had a free moment and got my O2 working again!

I was completely wrong, the regulator was fine. I double checked the all solder joints and re-flowed any that looked suspect as well as all the components in the power section.

While I was examining the board, flipping it around under a magnifying glass I felt some odd rattling from the 3.5 mm output jack that. It was faint, you felt it more then you can hear it. I de-soldered it (a complete pain-in-the-rear) and replaced it with one I had in my parts bin.

Powered it up and it works again! At this point I'm going to sum it up as my stupid mistake, a weak solder joint that just happen to fail after a week of burn in. I should have triple checked re-flowed everything first before making outrageous presumptions.

Thanks to RS and everyone that offered their suggestions.

[billyk]

Mouser order is in, boards are ordered.
I'm pretty psyched to add this li'l guy to my collection.
Thanks to RocketScientist for all the effort in bringing a new goodie to the community.
I'll report in when it is assembled.

[Willakan]

The only vaguely difficult part of the build for me was avoiding/fixing solder bridges when soldering the MOSFETS and regulators, but that is more testament to my ****-poor technique and the fact I decided not to invest in any desoldering equipment. Hence I had to get rid of the bridges by heating the solder and poking them with a cocktail stick! Worked surprisingly well, all things considered.

EDIT:@billyk: Not easily, I'm afraid. The O2 uses a dual-rail supply.