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justin

New Portable USB DAC/Amp to preview at Maryland Meet

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i think those are good goals.

Agreed. It definitely sounds like it's going to be a great little product, especially considering it's size it should be a hit on the market. For myself though, I'd be more interested in the larger version with more options because now that I'm not tethered to one stationary spot I tend to move around the house when listening. My one gripe right now is my source is pretty much limited to an iPod but with the addition of something like what I was talking about I could use the amp/dac with the iPod alone (albeit losing the DAC option) or in my stereo rig or from my computer at home and work. It's maybe a crazy idea but it's nice to dream.

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Justin, would you be bringing the prototype to the Boston meet, assuming the Boston meet actually happens? I don't know what's going on with it since I'm not involved with the setup this time around.

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Yes, I'll bring it to the Boston meet if it happens

Here are a couple of better pics, I've had a few questions about the size. Subway cards are the same size as credit cards

board1.jpg

board2.jpg

Back has USB and DC jack, inbetween the boards are the li-ion battery and a capacitor

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that thing is freaking petite and so thin. the pic in the meet impressions thread is deceptive.

side view action :angel:

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if i can set up a damned Ohio meet...

do you have a particular idea as to when you might host such an event?

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if i can set up a damned Ohio meet, would you attend and bring it? what kind of price are you looking at, when they come out?

At the meet Justin mentioned the price will potentially be $500 for the amp/dac. He's also planning to offer just the amp and that would be $300. Of course these are subject to change ;)

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Justin, I was wondering if you ever received my e-mails from last week. :angel: I seem to have been having problems with my POP3/SMTP mailings recently. Hmm....

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whatever date i can ever get more than 3 people to agree on ;)

that's for being so specific with that open ended date window. :P

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Justin, mind if I ask what chips your design is based off? Of course, if this is a secret, I absolutely understand. :angel:

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PCM2707 performs USB to I2S conversion

AD1896 is the upsampling

WM8740 is the DAC

OPA365 are for the analog filter

TPS79333 and TPS73150 are the voltage regulators

MAX1896 steps up the DC voltage on the analog side

the headphone amp section isn't final yet

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theres no hiding from a particular x-ray machine anyway :P

If say plugged into the computer, would the power draw provided be enough to at least make a difference vs running all battery? Or does it not draw anything from the usb?

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I love the fact that Justin's got nothing to hide (except the units from those of us that want to hear them :P)

I think it would have brought the funny big time if he'd posted the specs like this:

PCM2707 performs USB to I2S conversion

to simulate the use of red nail polish! ;D

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editted to preserve justin's privacy :)

PCM2707 performs USB to I2S conversion

AD1896 is the upsampling

WM8740 is the DAC

OPA365 are for the analog filter

TPS79333 and TPS73150 are the voltage regulators

MAX1896 steps up the DC voltage on the analog side

the headphone amp section isn't final yet

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The real reason justin doesn't have to worry about clones of this one:

he does smd soldering like a machine, crazy tight design.

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Poll time...

The toggle switch on the front of the amp could do 1 of 3 things. I'd like to find out what is the most desirable

1) Gain switch (this is the current use)

2) Change the analog input into a DAC line output

3) This one is unlikely to win, but could be done....a voltage switch, giving a shorter or longer battery life depending on position.

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theres no hiding from a particular x-ray machine anyway :P

If say plugged into the computer, would the power draw provided be enough to at least make a difference vs running all battery? Or does it not draw anything from the usb?

The DAC runs on USB power, and is filtered and regulated extensively. The headphone amp always runs on battery power. The power draw from the USB is 100mA (0.5W)

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Poll time...

The toggle switch on the front of the amp could do 1 of 3 things. I'd like to find out what is the most desirable

1) Gain switch (this is the current use)

2) Change the analog input into a DAC line output

3) This one is unlikely to win, but could be done....a voltage switch, giving a shorter or longer battery life depending on position.

2 would be my choice. Or have a jumper internally for that :)

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