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Doodlebug - USB Isolator - Page 3

post #31 of 197

Here's a cheap wall wart on Amazon, if anyone's looking!

 

http://www.amazon.com/AC-AC-ADAPTER-9VOLTS-1000mA-2-1mm/dp/B00ATECBMM/ref=pd_cp_e_0

post #32 of 197

Parts ordered.  :normal_smile :

post #33 of 197

Just a quick question, and hopefully I won't come off as too annoying/keen.

 

When do you plan on releasing/selling the next batch of PCB's? I am assuming that this first batch is for troubleshooting and/or further development of doodlebugs design, and the second batch would most likely be released after these changes have been made.

post #34 of 197
Quote:
Originally Posted by Avro_Arrow View Post
 

 

Now we just need a cute bug graphic...

I had an idea of using the usb logo for the legs.

 

The following is not an attempt for the actual logo, simply demonstrating the idea.

(i'm not a graphic designer, and not about to start)

 

 

If going for a real cute bug (nothing like the above) i think it would still be cool if its front feet were circular, middle one's triangular, and rear feet square, as a reference to USB.

post #35 of 197
Quote:
Originally Posted by DingoSmuggler View Post
 

I had an idea of using the usb logo for the legs.

 

The following is not an attempt for the actual logo, simply demonstrating the idea.

(i'm not a graphic designer, and not about to start)

 

 

If going for a real cute bug (nothing like the above) i think it would still be cool if its front feet were circular, middle one's triangular, and rear feet square, as a reference to USB.

 

If you ask me, that's already demonstrating the idea very well, and has definitely got me thinking. Let me ponder with some sketches and see if I can build upon your idea.

 

*quick edit*

Here's a few rough sketches. Since I'll be busy for most of the day until about GMT 23:00 ish, I guess the next best thing is to throw these in to generate discussion and ideation.

 


Edited by JacobLee89 - 2/8/14 at 7:20am
post #36 of 197
Thread Starter 
Quote:
Originally Posted by JacobLee89 View Post
 

Just a quick question, and hopefully I won't come off as too annoying/keen.

 

When do you plan on releasing/selling the next batch of PCB's? I am assuming that this first batch is for troubleshooting and/or further development of doodlebugs design, and the second batch would most likely be released after these changes have been made.


Yes, but it all depends on the builders for this prototype.  They don't work for Avro or me and we can't enforce any kind of schedule. ;) 

 

You'll just have to stay tuned ... it's the way DIY works. :)

post #37 of 197
Thread Starter 
Quote:
Originally Posted by DingoSmuggler View Post
 
Quote:
Originally Posted by Avro_Arrow View Post
 

 

Now we just need a cute bug graphic...

I had an idea of using the usb logo for the legs.

 

The following is not an attempt for the actual logo, simply demonstrating the idea.

(i'm not a graphic designer, and not about to start)

 

 

If going for a real cute bug (nothing like the above) i think it would still be cool if its front feet were circular, middle one's triangular, and rear feet square, as a reference to USB.


OK, now - don't you guys go posting something like this unless you mean it. ;) 

 

I like it ... a lot!  Can Beezar use this freely?

post #38 of 197
Thread Starter 

Everything's packed ... heading to the Post Office ...

post #39 of 197
Quote:
Originally Posted by tomb View Post
 


OK, now - don't you guys go posting something like this unless you mean it. ;) 

 

I like it ... a lot!  Can Beezar use this freely?

Sure.

post #40 of 197
Quote:
Originally Posted by RagunaAsh View Post


Sorry, just to clarify, the power can also be 6-9 VDC? Or is it limited to 6-9 VAC?

 



If you plan to use a DC adapter from the start, you can just install a couple jumpers in place of the rectifier diodes.
You can also use a DC adapter even with the bridge installed, you will just loose a couple diode drops in voltage but
the polarity if the connector wont matter.
post #41 of 197
Quote:
Originally Posted by tomb View Post


OK, now - don't you guys go posting something like this unless you mean it. " src="http://files.head-fi.org/images/smilies/wink.gif"> 

 

I like it ... a lot!  Can Beezar use this freely?

 



I like it too!
post #42 of 197
Thread Starter 

OK - all PCB's are now shipped!  I used 1st Class envelopes, so there's no tracking.  Please let me know if you have any issue.  Domestic should receive them by Tuesday, maybe Wednesday at the latest.  I'd allow 2 wks for International.

 

The bad news is that I forgot something on the BOM and I apologize profusely: the walwart.

 

The ideal walwart is at DigiKey: T1124-P5-ND .  Mouser is a bit of an issue, because there are no AC walwarts in the voltage range we want.  DC is still OK, but you better go for 9V to account for the drop through the diodes, etc., unless you leave the ones out that are rectifying.  Avro_Arrow can probably elaborate on this when he gets a chance.  I'll have the BOM corrected and re-posted, but again - please accept my apology.

 

EDIT: I just got back from the Post Office and started posting on the page that was already loaded when I left, so I didn't see some of Avro's posts:

 

1. As far as we are concerned, DingoSmuggler's logo is it.  It's simply outstanding!

2. Avro_Arrow is the expert, but the part about the DC vs AC walwart is that it's important that you allow enough voltage to provide 5.25VDC.  That's what we're shooting for.  Many, if not most, of the high-quality DACs we want to use have many regulators on board.  For instance, the pupDAC has some that provide +or- 4.75VDC for the voltage swing on the analog output.  It's important to have enough over-voltage that the DAC's regulators are not thrown out of their linear range.  Most are all low-dropout regulators, but the LM317 on the Doodlebug is not.  To maintain 5.25VDC, it will need 7.25VDC (DO voltage = 2V).  A 6VAC walwart will gain voltage through rectification, a DC walwart will not.

 

In any event, this is one of the reasons for still prototyping.  I'll try to come up with a list sometime today of other suggested walwarts.  Avro_Arrow sent me several over the last month or two.  Jameco is perhaps a good source, too - they like to stock a lot of wall adapters.

 

EDIT: Corrected the DCV recommendation to 9VDC, per Avro_Arrow's recommendation.


Edited by tomb - 2/8/14 at 10:18am
post #43 of 197
I would say a 9 volt DC @ 500mA to 1 A would be a good substitute walwart if you want to go that route.
For AC, 6 volts @ 1 A or 9 volts @ 500 mA are recommended.
post #44 of 197

I will be following this for a possible future purchase. I'm using this isolator/PS combo and find it provides a substantial improvement in sound to my setups:

 

http://www.ab-system.hk/index.php?route=product/product&path=73&product_id=63

http://www.ab-system.hk/index.php?route=product/product&path=73&product_id=64

with the upgraded Cardas cable:

http://www.ab-system.hk/index.php?route=product/product&path=73&product_id=173

 

This and the Stoner Acoustics DAC and a BH2 headphone amp make a killer low-cost kit.

 

I wish you success and believe this is a great idea. I have a feeling we'll be seeing more of these types of products when people realize their effectiveness.

post #45 of 197
Thread Starter 

I've updated the BOM with an alternate for the C1 capacitor at Mouser.  Also, it now includes the walwart. :o  I've listed several alternatives besides the primary choice at DigiKey.

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