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Twisted Pear Buffalo Sabre DAC - Page 19

post #271 of 1283
8/21/08 at 10:27pm
Quote:
Originally Posted by BrianDonegan View Post
Can you measure the current directly (in line) between the PS and the Buffalo?

It's possible you have a short on the PSU causing the excessive current draw. A few pics of the top and bottom of the PSU would be helpful as well.
Thanks Brian, I switched Va and Vd to opposite sides of the LCDPS and the other side got hot. I checked the power supply for shorts and part orientation and everything looks good.

Va current = 61 mA
Vd current = 170 mA
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post #272 of 1283
8/21/08 at 11:29pm
Quote:
Va current = 61 mA
Vd current = 170 mA
Okay, those numbers look totally normal. Vd side should be getting warm, not Vd.
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post #273 of 1283
8/22/08 at 1:30am
Well that's good the numbers are normal, I thought I read somewhere that Va was supposed to draw more than Vd. The Lm 317 heatsink on my Vd side is too hot to touch for more than 3 seconds, as well as reg1 on the Buffalo.

The Buffalo does sound amazing though, you guys did a great job with this Dac
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post #274 of 1283
8/22/08 at 8:06am
The digital side runs at 3.3V, so you can actually drop the Vd output from the LCDPS to 5V to reduce the heat on Reg1.
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post #275 of 1283
8/22/08 at 11:22am
Quote:
Originally Posted by willisv View Post
Well that's good the numbers are normal, I thought I read somewhere that Va was supposed to draw more than Vd. The Lm 317 heatsink on my Vd side is too hot to touch for more than 3 seconds, as well as reg1 on the Buffalo.

The Buffalo does sound amazing though, you guys did a great job with this Dac
VA should draw roughly 160ma. And VD ~50 ma.

Are you sure you don't have your measurements reversed?
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post #276 of 1283
8/22/08 at 3:13pm
Quote:
Originally Posted by Russ White View Post
VA should draw roughly 160ma. And VD ~50 ma.

Are you sure you don't have your measurements reversed?
This is what confuses me, the silkscreen is very clear VD G VA G. I disconnected the VD wire and hooked my multimeter up inline between + on LCDPS and VD on Buffalo, this measures 170 mA and when I do VA I am getting 52 mA now. I will post some pictures later, I must have something hooked up wrong.
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post #277 of 1283
8/22/08 at 3:22pm
Quote:
Originally Posted by BrianDonegan View Post
The digital side runs at 3.3V, so you can actually drop the Vd output from the LCDPS to 5V to reduce the heat on Reg1.
I will do this Brian, should save some wear and tear on my Buffalo.
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post #278 of 1283
8/28/08 at 5:59am
Russ, can You tell me what is the oversampling rate of this DAC and can it be modified to NOS DAC somehow?
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post #279 of 1283
8/29/08 at 7:19pm
When you guys are back from holidays, can you let me know what it would cost for a bare board + DAC chip? Soldered on or not, doesn't really matter.
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post #280 of 1283
8/29/08 at 7:28pm
Hi,

Very good news here. We have a fresh batch of PS / Opus boards arrived and we will be back in business very very soon.

We also have some exciting new things coming, but they are still at least a few weeks off.

Cheers!
Russ
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post #281 of 1283
8/29/08 at 9:00pm
This one is for Dustin, Russ, Brian.

I was thinking about the name you selected for your product, ''Buffalo Sabre''.
Hum! Good team indeed, but will it be good enough to play well in Montreal!!!!

LOL!! LOL!!!

I just could not resist!!!

Jean-Charles
LL
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post #282 of 1283
8/29/08 at 9:54pm
The funny thing is, I am a Nashville Predators and Colorado Avalanche fan. I just could not miss the hockey reference when I designed the DAC.

Cheers!
Russ
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post #283 of 1283
8/31/08 at 11:00am
Quote:
Originally Posted by Russ White View Post
The funny thing is, I am a Nashville Predators and Colorado Avalanche fan. I just could not miss the hockey reference when I designed the DAC.

Cheers!
Russ
Hi Russ
My previous mail was just to make fun of course. I spent most of my life in or around Montreal, so I folowed the CH since I was a kid.
Our harts are also in Colorado. As you know, the Avalanche are the former Quebec City's Nordique that moved to Denver. Quebec's fans never forgot them.

I found the voltage requirements needed for the Buffalo, but not for the other circuits: i/v, metronome, SPDIF and the coming Conterpoint.
I would also be interested to know the range of the ajustable power supplies, LCBPS, LCDPS and LCPS. What voltage do you use at the input of the ajustable regulators.

Thank you, have a good day

Jean-Charles
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post #284 of 1283
9/13/08 at 4:30pm
Yay!
I _finally_ got in an order(after checking the twisted pear audio site every day for a loooong time) :P
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post #285 of 1283
9/13/08 at 4:48pm
10 minutes until the next round is available.
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