[pistolsnipe]

hey joneeboi, what are your thoughts on a 5->12 vs 5->15 volt dcp? is there a performance/stability tradeoff? i noticed that particle man has a 15 volt dcp... where as in my prototype build i had a 12 volt. could that be why he was having issues?


also in your mouser bom link you have a 5->9 v dcp

 

[particleman14]

ya I was wondering the same thing if the 12v vs 15v dcps made any difference? i actually ordered both but they are supposed to match with the U2( either 10v or 12v) and mouser only had the 12v so i went with the 15v dcp.. I guess we'll wait to see other builds to see if its really an issue.

 

[Anonanimal]

I've got my first Carrie board fully populated (15V DCP), but I'm waiting on some stuff to be able to build up my BantamDAC(s). It might be a while, but I'll let you know what I see when I get to that point. Happy to see you got yours working!

 

[particleman14]

also guys i just spent a bit of time creating front and back panels for the carrie amp. I used the mini3 panel dimensions to make the front panels (I did a trial fit from my own mini3 panel to the carrie amps to make sure they all lined up and they do!)
and i carefully measured the rear usb jack dimensions to create the rear panel.
If enough people are interested maybe we could do a group buy to bring down the costs. or if you just want the specs pm me and I'll try to send them to you.
so far my costs are 18$ front and 16$ rear panel per.

here are some preliminary pics carrie - Imgur
(sry about bad cropping, had to download a crappy dxf to jpeg converter )

 

[joneeboi]

He resolved the issue. His DCP0105 didn't have enough instantaneous input current, so grabbing the power from one of the grub's electrolytic capacitors solved it.

Working with

1. 1W DCP chip with maximum 85% efficiency;
2. whatever efficiency you have with the TL750L regulator series;
3. AD8397 current draw of slightly over 24mA at just over 10V;
4. max power supply input of 12V on the OPA690 (my 15-12 prototype put out 12.6V after the regulator) and its current draw;
5. the current needed by the TLE2426 to keep the rails centred around ground;
6. and some Macbooks' and PCs' inability to supply sufficient power, let alone any 2W chips;

I felt more comfortable having the 12-10 combo as the standard config.

Also, if you want to do a group buy, you have to run it past the powers that be. So they make sure you're not making any money off the process and that you don't scam anyone and what not.

 

[particleman14]

ya if there are enough people ill do a thread in the group buy. just doing a little interest check to see if its even feasible..

 

[Anonanimal]

With respect to the front panels, I'll probably be designing my own, but thank you very much for the group buy offer.

Also- great work on the board layout joneeboi. Very easy to build, and looks great when it's populated.

 

[cobaltmute]

Quote:

Originally Posted by joneeboi /img/forum/go_quote.gif He resolved the issue. His DCP0105 didn't have enough instantaneous input current, so grabbing the power from one of the grub's electrolytic capacitors solved it.

If you're going to grab off an electrolytic, the only one you can use is C5. I would advise that you used the Digkey part suggested for that (PS-C 560uF) as that is about the largest that will fit the 6.3mm diameter layout. To simplify wiring, you could omit the LED on the grub and use the LED point as for the wire connection. That should be close enough to the cap.

 

[tcpoint]

If you get a group buy on the panels, I'll take two sets.

 

[jezz]

If the group buy gets started, I'd be up for a couple sets as well. Every time I DIY my own panels, I end up spending more time with the panels than with the amp itself and usually regret not going to FPE from the start.

 

[sandbasser]

count me in for two sets of panels.

 

[TeraHz]

Just got my boards today. They look awesome.

Looks like DCP010512BP is On Order from Mouser and also missing from Digikey. There are 33 DCP021212P's from mouser which are 2W (0.167 mA). Can they be used? 270-470-RC's are gone as well for a couple of months.

 

[joneeboi]

The DCP021212BP can't be used because it takes a 12V input. It has to be a DCP0105B or DCP0205B device for a 5V input.

 

[TeraHz]

Oh, my bad. I didn't even realize these have different Vin.
In that case I'll order from digikey. They should have it in a couple of weeks.

 

[joneeboi]

I seem to be short all my rail capacitors and a potentiometer. u_u"" Anyone have spares?