Post pics of your builds....

[tomb]

Nice work, Fitz! I remember when you were talking about this at the Atlanta meet. What you've done with it is not necessarily the first thing that comes to mind when someone mentions a protoboard project.

That pic of the bottom with your solder joints is simply amazing!

[Fitz]

Thanks Tom

Yeah, I can only imagine what you must've thought I had in mind when I said it was gonna be on protoboard. Nightmarish visions of parts soldered down randomly and wire jumpers stacked several layers deep, eh?

I don't really feel confident designing my own PCBs, considering the added cost and my tendency to change things every other minute, which is why I just went with protoboard.

[Fitz]

edit: made some changes, fixing a possibly silly mistake. wanna test things more before deciding if it's better or not..

[dBel84]

Originally Posted by Fitz

Yeah, I can only imagine what you must've thought I had in mind when I said it was gonna be on protoboard. Nightmarish visions of parts soldered down randomly and wire jumpers stacked several layers deep, eh?

you mean something like this = no not mine , somebodies DIY DAP ..dB

I have kept this image to help keep me on the straight and narrow

[cetoole]

Did this last night, so I could actually get SPDIF output from one of my other comps. Ended up having to make a really ugly cable to use it though (no, you cant see it).

Fuzzy little black thing is a PE-65612, 0.33uf Panasonic stacked film next to it, 75r RG-179, and a 75r rated bnc output jack. You cant really see much detail, but there is a series ~221r smd resistor on the pcb connected to the primary, and a pair of 220r 1206 resistors soldered directly to the transformer secondary in parallel. Assumed ~30r output z from the SN74F244 output buffer, that gives around 76.5r nominal impedance. I really need a TDR though to get this good. Meh, it sounds fine, and my DAC locks no problems. Next one I do, I am killing the input jack below the BNC, and mounting it lower, because it is a huge PITA to install or remove the card. Works good, using the kx drivers and ASIO4ALL.

[Fitz]

Originally Posted by Fitz

edit: made some changes, fixing a possibly silly mistake. wanna test things more before deciding if it's better or not..

Yeah, this is why I don't do things on PCB.

Feedback loop has been redone differently (more like on the M3, but completely coincidentally), and I'll need to wait on the additional black resistors I ordered before I can make the changes final (of course today the black silver mica caps showed up, but then I go and do this). I also found I could still make the opamp oscillate in certain cases (not real world situations) when using the normal PPAv2 rail isolation configuration with PN4392s, but it works flawlessly so far using something more like that on the M3. So I think I will redo the power section of the board for that instead.

Sitting on the table, I had the "amp crusher" frankenphones playing louder than I usually listen to my bookshelf speakers, running a little "stress test" by pushing the voltage and current way beyond any real headphone use.

Even sounded pretty decent from that distance (crappy SQ on those headphones up close), at least until I drove the amp into clipping.

(holy crap it is storming so hard now, better power off & disconnect the test equipment before any of it gets damaged or I get surprised by thunder and accidentally blow something up again)

[Fitz]

For a completely different kind of DIY, today I put up the additional bookshelves I had been planning, which is a large factor in allowing me to be able to keep my AKG collection (since it takes up so much space):



Man I love these KV shelves so much. Next up is to put a few over my "workbench" so I can have better access to my tools and supplies when working on my silly little projects like that protoboard amp.

[FallenAngel]

Finally I am getting one project off the table and into my pocket

This is my 16GB solid-state FLAC playing (RockBoxed) diyModded iPod (Mini 2G) with a 26 hour battery life

No headphone jack, metal end-panel on top, all black



Unfortunately after painting it black (there was originally no black iPod Mini), I realized that the paint stuck to the inner part of the hole for the clickwheel and to get proper use of the clickwheel, I had to remove that, which chipped the case a little. Considering how hard it is to paint it properly, I'm thinking I'll leave it as is until I have lots of free time on my hands to do it meticulously.

Oh, and the kicker is that the entire thing cost me about $100

[MusicallySilent]

I am really considering getting one of those, throwing in 16-32gb and rockboxing the thing to use as a source if i ever get an amp, I probably wont mod it for 100% line out just because I may want headphone jack at times, though if i get portable amp i will :P

[swt61]

Originally Posted by Fitz

For a completely different kind of DIY, today I put up the additional bookshelves I had been planning, which is a large factor in allowing me to be able to keep my AKG collection (since it takes up so much space):



Man I love these KV shelves so much. Next up is to put a few over my "workbench" so I can have better access to my tools and supplies when working on my silly little projects like that protoboard amp.

On no Sister, this just won't do! Honey do you even own a color chart? Start all over, and organize darkest to lightest, then tallest to shortest. Some little doilies on the shelves under the books would do a whole lot of fabulousness child!

And honey please...an Orange chair in a zen room?

And who picked out that wall color... The Atlanta department of Corrections?

And ...hey stop...sister please!...get the heck outa my...oh snap!

Wow! I was channeling Richard Simmons there for a minute...Uh nice job Fitz.