[tablekwan]

a PPA2 build by my friend..

 

[pho_boi]

Quote:

Originally Posted by tablekwan a PPA2 build by my friend.. ]

wow very nice!!

 

[stevodude]

Ok, I've gone from 220u to 470u power caps, removed R5, put a dualgang switch in for my 2 headphones I use, removed 2x132-2132 adapter and put in a single 2132 chip.
About all I have done and will do to this version, I have some hammon 1455 case's so might wip up a modified ppa & crossfeed or something to fit.

any way here's the dodgy guts of my first cmoy, linked thumbnails


show you my dodgey soldering, and also the gain switch thanks to tangent\'s idea, I have 2 gain settings.
1 - circumnurals - using 1.269k ohm (parallel 1.8k & 4.3k) to get a gain of about 8.8
2 - canal phones - using 4.7k ohm giving gain of about 3.13
gives me about %80 for full volume for both headphones
mini barrel power connector - powered by 16v dc



Showing dodgey power caps, and wires floating around



yellow switch is on/off/on, battery/off/wall power. currently only running wall power as this is for my chaintech av-710 at home, and wanted a cheap Headphone amp to power my mdr-cd470\'s
Eten m600+ running Mortplayer with \'best of Sade\' ripped direct to wav, then oggdrop aoTuV version with Aoyumi\'s code, settings adjusted as here: http://jult.nl/printscreens/aotuv
results in a variable bitrate around 224, with lowpass filter @21800Hz, scale factor %99, '7' quality - gives me about an average file size of 7Mb per song, and much cleaner than 196 mp3 that most of my media is (some are going to be redone from the cd's)

 

[dbfreak]

Pic of my first amp. A scaled down version (per Marcello Pellerano) of a Zen. Solid red oak with highly polished aluminum accents. Matched 610 MOSFETS, Vishay resistors, Cerafine/Nichicon Fine Gold caps, teflon coated silver wire (Wellborne Labs), Alps "blackbeauty" pot (buttery smooth

), custom 2 inch aluminum knob with LED, all stainless steel hardware, Neutrik output, Cardas inputs and an Amveco power supply for each channel. Sorry for lousy pic, done with friends cell phone and the inside shots didn't come out. Miles Davis - Kind of Blue sounds like heaven through Grado 225's.

 

[dbfreak]

 

[philodox]

Absolutely gorgeous dbfreak!

 

[MASantos]

Very nice build. How long did you take to make that layout in the breadboard? That case is also very sleek, where did you get that knob?

 

[dbfreak]

Thanks for the compliments. Boards were purchased from forum member with most solder work done. I just needed to build the case, solder some diodes, a couple of resistors and match/solder the MOSFETS and heatsink them (Kapton tape works great by the way). I requested a sample from a tape company online and was sent enough for the project. Knob also came from forum member. I had to do the wiring for both AC/DC and probe/tweak it with a Fluke and friend's PC scope. No bread board used in project. Amp PCB's are from digi01 in Hong Kong. Total time was about three days (on/off/) to build. Most of the time was used sanding and polishing the aluminum. My local Lowe's aluminum is pretty scratched up when it hits their sales floor. My buffer saw some heavy work. Polishing wasn't too bad. I finished the wood with four coats of Minwax oil-based polyurethane - Clear Gloss. Nice durable finish and shinny like a fresh bowling alley lane. When I can get a decent camera, I will post inside pics.

 

[Seaside]

tablekwan, wow....

As a purfboard with wrapping wire guy myself. your work is absolutely beautiful. I can see the amount of effort you put on it. Very nice.

bazmonkey, you got nice cmoy there. Not too shabby at all. Yours make me thinking about getting another altoid tin.

 

[bhjazz]

Quote:

Originally Posted by MASantos where did you get that knob?

There are very similar knobs out at audiokit.it. You can get some sweet brushed or polished knobs that look verrrry close to that. Plus, shipping to the states is only about 10 days or so from Italy. They are great to deal with, in spite of the subtle language barrier.

 

[dbfreak]

Quote:

Originally Posted by bhjazz There are very similar knobs out at audiokit.it. You can get some sweet brushed or polished knobs that look verrrry close to that. Plus, shipping to the states is only about 10 days or so from Italy. They are great to deal with, in spite of the subtle language barrier.

Thanks for that link! Like I said earlier, I don't know where the knob came from. I bought it here at Head-Fi from a forum member who described it as "custom." I will be building a SDS Labs (Sheldon Stokes) solid-state headphone amp and now know where to purchase a similar knob.

 

[Ace o' Spades]

Quote:

Originally Posted by matthewcarlrose This is my millett hybrid I built earlier in the year. My first diy project, next is a Pimeta and crossfeed and next? who knows!!

That. Is. Beautiful.

CMOY coming soon using tangent's design

 

[Fitz]

Quote:

Originally Posted by Ace o' Spades That. Is. Beautiful. CMOY coming soon

Indeed... aluminium is just too damn sexy.

 

[elmer_dudd]

that would look hot with a round pushbutton switch instead of a toggle.

cut that pot shaft too man!

 

[was ist los?]

An Alien dac built on a protoboard in an Altoids chewing gum case. It was quite a squeeze to build. I've also got a copper plate ground plane on the bottom and i'm considering squeezing a 74HCU04 amp in that extra space.