Millett "Starving Student" hybrid amp - Page 205

Okay, well, I finally got the enclosure for my amp...I have no more excuses not to start working on it.

Here's yet another dumb question - any reason why I can't use the aluminum case as ground? I'm using this case:

Aluminium Case for small projects - 113*70*25 (mm) [STR103C2B] - $7.50 : Seeed Studio Depot, Arsenal for interaction engineering

My other fear is that it's small, I'll have to mount the heat sinks 'sideways' (compared to many other amps here)...I really hope I can fit everything together in there properly.

That's a real classy looking (and very affordable) alum box. I'm not 100% sure if it will be large enough though, albeit some may have managed to do so with similar size.

With SS any conductive material like alum you should be able to use as ground. Btw, is there a reason why you must have the heatsinks 'sideways'? Wouldn't it just sit straight up on top of the enclosure?

Ah, sorry - I meant sideways as in this one here:

http://www.pmillett.com/images/starving/gross2.jpg

I guess it's not technically sideways...

OK - I had a little trouble with the panel LED (it's still out), but the production board is a success! So are the heat sinks - horizontal mounting using the same screws that attach the MOSFETs and they're barely warm after about an hour. Plus, these heat sinks are cheap as all get out - about $1.30 ea, if memory serves.

I went with a 10K pot, using 39K input resistors - works great and gives close to ~40K input impedance, which should be sufficient for most source coupling caps. It certainly doesn't lack any bass fed from a BantamDAC.



EDIT: More pics later ...

cool.

Looks good!

After buying my parts, most of which are from the original design, I began skimming through this thread. After seeing all of the "improvements" people have made to the amp (different caps, etc...) I am wondering if I should worry about my purchase. Are there any flaws in the original design that I should worry about?

Also, I have not yet purchased a power supply. Is there a power supply which is readily available that would suit this amp? I am not a huge fan of ebay, but if that is the only source then I will get a PSU there.

Oops, sorry for the double post. How do I delete?

On for 4 hours and the hottest part of the amp measures 37deg. C. (98.6deg.F.). That's right at the root of the heat sinks. The rest of the case measures no more than 33-34deg.C. (91 to 93 deg.F.) I think we have a winner.

The original bom sounds very nice, it's what's in mine and I can't really fault it much. I'm not sure how the updated list/layout affect things but I'm very happy with mine as it is.

The Power brick can probably be bought from a number of sources but I don't think anyone to date has had any problem with getting them from ebay.

Great news, looks like we have a winner!

On for 8hrs now and no hotter - this is it!

Get them in stock soon

I just noticed, we have almost the exact post count... must be a sign

Tom -

The BOM that I have is dated 2/16/09. When / where will update be available (including the heatsinks)??? And, since I already have all the other components, will you be offering the heat sinks from Beezar???

Sorry if this is not the appropriate venue to ask this type of question... Mods feel free to delete as you see fit.

I'm a one-man band at his point - Dsavitsk has done his work - so give me a chance. I know it's frustrating - I've been sitting on these boards for awhile now, and the tubes longer still.

The heat sinks will be included in the kits (30). After that, I was not planning on carrying them. They are a standard Mouser-DigiKey item:

569003B00000G

EDIT: Mouser says $1.23 ea, so definitely in keeping with the Starving Student theme.

As long as I can get a board I'll be happy. Though tubes would be good too.

We have over twice the number of boards as tubes, so I think that will be assured.