Re: [Gumstix-users] hardware for audio codec testing and CF

[Doug S. <wea...@co...>]

Brad Midgley wrote:

 > I'm planning the same thing for trying a class 1 bluetooth adapter 
through the
 > uart... I am going to solder into the vias on the  tweener. tweener 
is the only
 > board I'm aware of that allows you to stack another board on it.

The problem I have with this is size, the length almost doubles and the 
height
increases also. I just discovered a viable solution for my prototyping: 
using
the SMT breakout AC97 signals to one of these schmartboard TQFP adapters:

http://store.yahoo.net/engineeringlab/circuitboards8.html

So rather than using audiostix, I'll use the LM4550 audio codec, which I 
can find
at digikey. Digikey also has some nice headphone amps and volume/tone 
controls
from National:

http://www.national.com/appinfo/audio/

Some of those are available in DIP so easy to prototype with. One 
advantage of
using external audio codec is having more audio inputs and outputs. The 
other is
having access to the 3 UARTS, NSSP, I2C, and LCD ports.

Now that I finally found the parts/adapters to do what I need, the gumstix
store no longer has the breakout boards :( Guess I have to wait for the new
version.

  -- Doug