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Twisted Pear Buffalo Sabre DAC - Page 17

post #241 of 1283
8/13/08 at 8:50pm
This IVY is no joke to solder! All that is left are the -IC's, they look intimidating......
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post #242 of 1283
8/13/08 at 9:09pm
There's a lot of info out there on how to solder SOIC opamps, but here is how I do it with regular solder**:

Using a sharp point solder tip and fine gauge solder, I put a small dab of solder on one of the corner pin pads. I then hold the opamp in position with tweezers and touch that pin/pad with the soldering iron, so it is soldered in place. This leaves the opamp locked in position. I then touch the next pin and pad (at the junction) for a few seconds to heat it up and touch it with solder to put a tiny amount of solder on. I just work my way around the chip. Takes about 30 seconds total after the first pin is attached.



** I actually normally use solder paste from a syringe. I put a tiny dab on each pad, then plop the opamp on, then touch each of the pins with the iron. Done. If you do a lot of smd soldering, I can't recommend paste in a syringe highly enough. It's easier then through-hole soldering.
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post #243 of 1283
8/13/08 at 9:33pm
Thanks Brian, got it done but will try the easier path next time around. Never thought I would have to use a magnifying glass!

Another question:

For those of us using both balanced and SE outputs on the IVY, which values do you recommend for R9-12 and R13-16 or do we need to pick one set or the other? Thanks!
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post #244 of 1283
8/13/08 at 9:40pm
Quote:
Originally Posted by BrianDonegan View Post
There's a lot of info out there on how to solder SOIC opamps, but here is how I do it with regular solder**:
Tangent has a video of exactly that procedure......
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post #245 of 1283
8/13/08 at 10:03pm
Quote:
For those of us using both balanced and SE outputs on the IVY, which values do you recommend for R9-12 and R13-16 or do we need to pick one set or the other? Thanks!
You should use the standard 2K in all positions.
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post #246 of 1283
8/14/08 at 4:11am
After a productive day, my Buffalo made its first sounds......





All of the wiring I have done is temporary, and there is still a fair bit of wiring work to be done for the OTTO, LEDs and TOSLINK. I'm waiting on some Teflon SPC wire from navships. You can see the spare space for another LCDPS when Brian has them back in stock.

At first listen, the sound is good. SPDIF lock is less than a second from my Camrbidge Audio 540Dv2, which I am very happy with.

The only issue I have had so far is with the OTTO. Pin 2 randomly pops up 10-80ohms resistance. I have reflowed the joints, but I think it is in the relay. I don't need all 4 pins, so it shouldn't be a problem.
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post #247 of 1283
8/14/08 at 5:16pm
Brian/Russ,

Did either of you notice a burn-in time for the buffalo?

Fran
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post #248 of 1283
8/14/08 at 5:27pm
Quote:
Did either of you notice a burn-in time for the buffalo?
No
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post #249 of 1283
8/14/08 at 5:28pm
Quote:
Originally Posted by BrianDonegan View Post
No
WUHOO! I knew I liked you Brian, or did your business manager make you say that?
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post #250 of 1283
8/14/08 at 5:29pm
Quote:
Originally Posted by n_maher View Post
WUHOO! I knew I liked you Brian, or did your business manager make you say that?
No







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post #251 of 1283
8/14/08 at 6:31pm
say something else other than "no"

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post #252 of 1283
8/16/08 at 10:29am
Why can't I find any information on whether it's an upsampling DAC or not?
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post #253 of 1283
8/16/08 at 10:53am
This might help: http://www.esstech.com/products/digi...F%20080221.pdf

It is an upsampling DAC.
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post #254 of 1283
8/16/08 at 12:09pm
I still can't find whether it upsamples tp 192, 96 or any other frequency.
And I guess it's impossible to bypass the upsampling, right?
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post #255 of 1283
8/16/08 at 9:46pm
Have a small problem with the LCBPS, I can't get the +/- below around 16 to 17 volts. The heat sinks are getting hot too. Pretty sure I soldered it together right. The little screws on the voltage regulator have hit their end and keep clicking without a drop in the voltage.
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