[tomb]

Quote:

Originally Posted by rds /img/forum/go_quote.gif At Mouser it seems to say the regulators can ship in 10 days: REG101UA-3.3 REG101UA-5 ...the adjustable one isn't available till hell freezes over, but these will work fine afaik. What do you think? I was going to order some soon too.

Use of the REG101UA-5 means USB power is not an option.

 

[error401]

Quote:

Originally Posted by tomb /img/forum/go_quote.gif Use of the REG101UA-5 means USB power is not an option.

Well, it is if you use it unregulated.

 

[tomb]

Quote:

Originally Posted by error401 /img/forum/go_quote.gif Well, it is if you use it unregulated.

Which of course, sort of means a "REGulator" is pointless.

 

[rds]

so there's no solution to this usb power problem at the moment?

 

[tomb]

Jeff Rossel would be the first suggestion at Glass Jar Audio.

Rochester Electronics (Rochester Electronics - Leaders on the Trailing Edge of Technology) apparently has thousands of the REG101UA-A. Whether that means you have to buy thousands to get one, I don't know - but it's worth a call.

Otherwise, you may have to wait until September unless some nice Head-Fier has extras.

 

[splaz]

Quote:

Originally Posted by rds /img/forum/go_quote.gif so there's no solution to this usb power problem at the moment?

I've had a quick look, there are a few similar chips, however pin outs aren't exactly the same.

Didn't have a detailed look at the datasheet and indeed, not 100% sure what's desirable or if it would work.

However, ADP3334 looks somewhat close... problems are that you'd need to do some pin lifting/jumpering or trace cutting/altering, the gnd and shutdown/enable pins are in the wrong spots for a start.

If you get desperate maybe ?

 

[soloz2]

has anyone compared the Opus USB module v the Alien DAC?

 

[MisterX]

Quote:

Originally Posted by soloz2 /img/forum/go_quote.gif has anyone compared the Opus USB module v the Alien DAC?

Yes.

 

[MisterX]

Quote:

Originally Posted by rds /img/forum/go_quote.gif so there's no solution to this usb power problem at the moment?

You can always just connect a jumper from the "AV+" to "5V" pad and run it without that regulator.
The difference is not a lot.

 

[Eokboy]

Quote:

Originally Posted by MisterX /img/forum/go_quote.gif You can always just connect a jumper from the "AV+" to "5V" pad and run it without that regulator. The difference is not a lot.

I add the 22uH inductor. Don't know if there is any difference. Just put it there to make me feel better.

BTW anybody has a spare REG101UA-3.3?

 

[MisterX]

I did that with a ferrite bead once for the same reason.

Rightmark testing suggested it was a waste of 45 cents.

 

[bhjazz]

WHO SAID FLUX PEN?????

Brilliant! I'm working on my first pass at the PCM2702 and it's going perfectly. I covered the area with flux from the pen and using a Radio Shack 5X Magnifier (part 63-1309). I'm actually able to solder pin by pin, with no bridging. Apply a tiny dab of solder to the iron, let it sit on the joint for a second, and the solder flows into the joint. Neat! I'll throw some photos up when I can. I'm damn proud!

 

[tomb]

Yeah, one of those flux pens are so sticky it almost glues the chips down, too.

 

[bhjazz]

I'm trying to make sure there's not too much under the chip. No need to get that conductive junk under the chip where it'll never be cleanable! Yikes!

The combination of the magnifier and a 10x jeweler's look for inspection is cool.

 

[pinkfloyd4ever]

Quote:

Originally Posted by bhjazz /img/forum/go_quote.gif No need to get that conductive junk under the chip where it'll never be cleanable! Yikes!

fyi: flux isn't conductive. People often recommend cleaning it just because it looks better cleaned and supposedly it can cause stray capacitance, but I've never had any problems with projects that I haven't cleaned the flux from