July 13, 200718 yr 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.
July 15, 200718 yr 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.
July 16, 200718 yr Author 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 Back has USB and DC jack, inbetween the boards are the li-ion battery and a capacitor
July 16, 200718 yr that thing is freaking petite and so thin. the pic in the meet impressions thread is deceptive. side view action
July 16, 200718 yr if i can set up a damned Ohio meet... do you have a particular idea as to when you might host such an event?
July 16, 200718 yr 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
July 16, 200718 yr Justin, I was wondering if you ever received my e-mails from last week. I seem to have been having problems with my POP3/SMTP mailings recently. Hmm....
July 16, 200718 yr 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.
July 20, 200718 yr Justin, mind if I ask what chips your design is based off? Of course, if this is a secret, I absolutely understand.
July 20, 200718 yr Author 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
July 20, 200718 yr I love the fact that Justin's got nothing to hide (except the units from those of us that want to hear them )
July 20, 200718 yr theres no hiding from a particular x-ray machine anyway 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?
July 20, 200718 yr I love the fact that Justin's got nothing to hide (except the units from those of us that want to hear them ) 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!
July 20, 200718 yr 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
July 20, 200718 yr The real reason justin doesn't have to worry about clones of this one: he does smd soldering like a machine, crazy tight design.
July 21, 200718 yr Author 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.
July 21, 200718 yr Author theres no hiding from a particular x-ray machine anyway 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)
July 21, 200718 yr 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
July 21, 200718 yr 2 would be my choice. Or have a jumper internally for that Internal jumper is a good idea, regardless.
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