[VncentValntine]

Quote:

Search the thread - someone has already built a gamma1/Carrie combo.  There was a part change they had to make on the gamma1 or the Carrie will not start.

thanks, yeah I found that post.  I guess what I was trying to find out was, if the power from the gamma1 was regulated, would it have a surge like the carrie would.  But since now i know the carrie is hooked straight up to the USB's power, that seemed to be what was causing problems.  Having the Carrie feed from Gamma1's modified regulated voltage and current, I'm hoping I can avoid this.  Thanks everyone =)

 

[joneeboi]

Hey all,
 
Check out this thread. 

 
http://www.head-fi.org/forum/thread/503428/carrie-amp-group-buy-2

 

[joneeboi]

I'm surprised at the low interest in the Carrie for this second group buy considering the number of PMs, emails and posts asking for it. Ah well. Less work for me.

 

[joneeboi]

This is a reminder that the group buy is closing in a little over a week. If you're holding out for some reason, stop and sign up before it's too late.

 

[joneeboi]

I should also note that my final version of the Carrie + bantam box works completely fine on my MacBook Pro 13" (mid-2010) and Carrie's MacBook. I suspect it still won't work on some MBs, but just an FYI.

 

[joneeboi]

One more day for the group buy sign-up. Come one, come all.

 

[TBomb06]

Will 20mm tall caps fit in the spec'd Hammond case? The C-C1+/-,C2-C7 caps are backordered at Mouser and a comparable part at Digi-key is only available in 20mm height. I apologize if this question has been asked and answered before...I did a quick search but found nothing. Thanks!

 

[jamesbobo007]

If I remember right there is only 16mm in the 1455C801, but I guess it depends on what enclosure your using
 

 

[joneeboi]

Just because the part at Mouser is backordered doesn't mean there aren't other suitable caps at Mouser. For future reference, the product pages at Mouser also have a "Find Similar" button on the bottom left. The dimensions required are 8mm diameter x 15mm height at 16V. Typical capacitance values are 330uF, 470uF and sometimes 680uF, but 470uF should be fine. Any more might have too much inrush current with this design.

 

[Soymilk]

for the schematic in the third post, is it a 12v output from the power part at the top right? from what i read of the thread that's what was the target right, 12v supply -> +/- 6v supply with the virtual ground?
 
also, is the bank of capacitors necessary between v+/gnd and gnd/v-? on tangent's site's page on virtual ground circuits he only has the capacitor between v+/v- for the one using a tle.

 

[joneeboi]

There is a TLE.

 
The output of the DCP010512B is 12V, but it's regulated down to 10 V with the TL750L10 and split to +/- 5V with the TLE2426.

 

[Soymilk]

whoops i left that out of my original question / wording was pretty bad. i meant that bank of capacitors after the tle going from v+ to the tle virtual ground and from there to v-; on tangent's site the virtual ground circuit using a tle does not have those capacitors, it only has a capacitor from v+ to v-. that's where my confusion/curiosity is coming from

 

[TBomb06]

Quote:

Just because the part at Mouser is backordered doesn't mean there aren't other suitable caps at Mouser. For future reference, the product pages at Mouser also have a "Find Similar" button on the bottom left. The dimensions required are 8mm diameter x 15mm height at 16V. Typical capacitance values are 330uF, 470uF and sometimes 680uF, but 470uF should be fine. Any more might have too much inrush current with this design.

Thanks for the reply. After asking that question, I actually re-visited the BOM on your web site and found that the 470uF would be a suitable replacement, and probably a good compromise with regards to the inrush current. I took the time to read through a lot of this thread and realized the values for those caps don't have to be 680uF.
 
I'm about to start on my Grub, then I'll be waiting patiently (and excitedly) for the Carrie boards to arrive

Thanks for putting together the latest group buy!

 

[Soymilk]

can someone shed some light on what C9-20 are for? i thought the capacitance was only needed from v+ to v-

 
also, i'm thinking about making one of these but to be used without a dac, so i was thinking of switching R1L/R/G with a dc filtering cap and maybe adding a bass boost. bass boost being a pot parallel with a cap, placed in series between R4L/R and the output (i think that's where it goes); this wont increase my current draw by too much will it?

 

[cobaltmute]

For the cap question, maybe you should check what I believe to be the latest schematic here You can have capacitance from rail to rail and rail to ground.