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Doodlebug - USB Isolator - Page 17

post #241 of 246
Thread Starter 
Quote:
Originally Posted by Avro_Arrow View Post
 
Quote:
Originally Posted by scootsit View Post

I think there's a huge potential here that may not have been previously mentioned. This should enable powering the pupDAC using USB on the go, from a mobile device, right, without completely draining the phone immediately, and without the likely crappy power coming off the phone(/wallwart that some OTG adapters can handle)?


Yes, indeed. You just have to observe the minimum input voltage requirements.

It would run quite nicely off 12 volt vehicle power. For DC, anywhere between

9 vdc and 12vdc would work great. Just don't exceed the working voltage of the

input cap which is 16vdc in the BOM.

:rolleyes: Hmm ... maybe I should start stocking some car adapters!?

post #242 of 246

Anyone wishing to use an alternate power source, this is an example of the mating power connector used in the Doodlebug.

Another example.

 

Cigarette lighter plug.


Edited by Avro_Arrow - 12/12/14 at 7:37am
post #243 of 246

I've completed one of my doodlebugs, and started on the 2nd. :tongue_smile:

 

Found that soldering directly to the ground plane for the SOIC-16 chip wasn't as much fun as it sounds. For the 4 pins that were connected to ground, i found them a lot easier if you pre-heat the ground plane first. Use the ground pad on a nearby 1206 component such as C3 or C8, pump a lot of heat into the ground plane with your soldering iron, then move back to complete the join.

post #244 of 246
Thread Starter 
Quote:
Originally Posted by DingoSmuggler View Post
 

I've completed one of my doodlebugs, and started on the 2nd. :tongue_smile:

 

Found that soldering directly to the ground plane for the SOIC-16 chip wasn't as much fun as it sounds. For the 4 pins that were connected to ground, i found them a lot easier if you pre-heat the ground plane first. Use the ground pad on a nearby 1206 component such as C3 or C8, pump a lot of heat into the ground plane with your soldering iron, then move back to complete the join.


I didn't pre-heat the ground plane on mine, but it sounds like a great idea.  The ground planes on the DoodleBug are significant.

post #245 of 246

Not sure if this question have been asked before but - here it goes..

 

Would this work with USB converters i.e...  The Berkeley Alpha USB.  http://www.berkeleyaudiodesign.com/alpha-usb/  

 

If so the USB input on the Alpha is a USB 2 connector.  Would I have to get a special made interconnect  USB cable?

post #246 of 246

The Berkley Alpha USB is a high speed device.

The Doodlebug does not work at high speed.

There are currently no high speed USB isolators.

The Doodlebug works only at USB Full speed.

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