This the reason why the datasheet exists :P Max supply voltage: 36V Max quiescent current draw: 5mA/amp, so for the 2134 it'd be 10mA total.

Oookay, I reflowed everything and the short is gone. And then L12 glowed red hot, melted part of the silkmask and desoldered itself after carbonizing everything in a 5mm radius. L12 is a ferrite! What caused it to do this? Nevermind, apparently Vbus got shorted with GND on IC1, and L12 was...

Finally built one of my boards, but I'm having the opposite problem of everyone else: my 5V checks out fine, but there's a short from 3.3V to ground. What are the most likely culprits for this? I checked the DAC chip for bridges, and found none. IC2 is aligned correctly.

I doubt he could have burnt through the silkscreen and destroyed a trace... rather you can notice a rather large solder blob between the bottom left pins on the 2702 chip in this picture: http://img508.imageshack.us/my.php?image=dac6rd2.jpg

Quote: Originally Posted by seanohue Hmm I'm having a real tough time with this. I think proper heat levels may make this easier. I'm trying to solder 30ga wires to the pins on a chip and I keep making bridges between the pins. I don't want to kill the chip on the board that I am...

Personally I don't like sponges. The sudden change in temperature when the iron touches the sponge damages the integrity of the metal, or at least changes the structure of the material. Go to the dollar store and pick up some brass wool for a buck, they clean much nicer and won't damage the iron.

Hakko 936.

Also, quick question: is it OK if I replace REG101 with REG103, and use a 12V PSU?

Quote: Originally Posted by amb "Sound better" by virtue of carbon resistors' high noise and instability? LOL. This sounds suspiciously like the vinyl/CD/tube/IC debate ;P

Quote: Originally Posted by AndrewFischer I use generic 1% metal film resistors for just about everything else. In qty. 200 there just isn't any reason to use 5% or carbon resistors anymore. Was there ever? XD

Gah, I still have two boards waiting to be built >_< Quick question, what happens if Vin is below Vout for the regulator? Does it work in pass through mode, shut down completely, or actually add noise?

Even for channel matching, could anyone REALLY detect the difference of 0.1% between the channels? The human ears are not exactly perfectly matched either, and I doubt your sound equipment is matched to 0.1% between the channels. Personally I think 1% resistors are fine for most audio applications.

Personally, I don't like the flood and suck method because it's too easy to screw up and leave the entire row of pins bridged, or have pins with too much solder sucked away. I like the paste and draw method much better, since it guarantees a solid connection and is super easy with some flux. For...

Quote: Originally Posted by n_maher I need some advice on checking continuity of the 2702 connections. I tried the "flood and suck" method of soldering my first one down tonight and while the results look good (no visible bridges under heavy magnification) my first test of pins one and...

Yes, they are the same thing.

Quote: Originally Posted by cetoole Exactly. It stems from there being so little of the item in question (in this case current) that there is all but a bug's worth present, and we all know how small insects can be. >.> I... don't think that's quite accurate.

Quote: Originally Posted by SoundGoon bugger all? Psst, that's the technical term we professionals use for just about nothing.

Quote: Originally Posted by mb3k Usually it's a somewhat thick liquid made of 99.999% silver. Where could I procure some of this 99.999% silver paste?! Anyway, silver loaded compounds are a complete waste for these kind of applications, since the chips produce nowhere...

How exactly would the inductor be implemented in the DAC?

I have a Fluke 8062A, inherited from my dad when he left for China, and just now found out how much it's worth new... It's a great meter, served me well for the past few years and a lot more years for my dad. I'd definitely recommend checking out some of Fluke's discontinued 80xx series...

Quote: Originally Posted by robzy Crap! I just got my digikey order before, and it apears i ordered the wrong ferrites. Would FERRITE ARRAY 400MA 75 OHMS SMD work? It apears as if it can be made to fit. Rob. [edit]: And can you really hear the difference between 5v and 5.4v? We are...

MASantos: Ah, digikey doesn't carry a wide range for the Silmics so I didn't see the 10V. I'd certainly be interested in obtaining a few. Alf, any thoughts on the power supply?

Quote: Originally Posted by MASantos What do you guys think of using Elna Silmic II 47uF 6.3V? I am thinking of using these in all positions except for C2. Using these instead of panasonic FC's is only a few bucks. Would someone be interested in a group buy? I think the only...

Whitewind: I thought about that, but I can't think of a way to make the DAC draw most of the current from the USB and only use the battery to boost voltage. I've actually been puzzling over the power supply most of the afternoon. Assuming the USB gives perfect 5.0V (which mine does), going...

0.4V? Ouch, my USB outputs about perfect 5.0V, so I need to set the regulator output to 4.6V? Won't performance suffer quite a bit at those levels?