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On 10/11/10 11:37 AM, miloh wrote:
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Challenges:<br>
Can someone make a generic module which will plug together
with<br>
any speaker and power amp combo? Would be nice to have a box<br>
which is "portable".<br>
Can it be done with an arduino?<br>
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<div>There are application notes describing how Maxim's TINI
chip and some DAC's to make (probably crappy sounding)
networked speakers -- circa 2004. </div>
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<a moz-do-not-send="true"
href="http://www.maxim-ic.com/app-notes/index.mvp/id/3266">http://www.maxim-ic.com/app-notes/index.mvp/id/3266</a><br>
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<br>
Also, check out my personal favorites, the Stellaris line of ARM
chips, now owned by TI:<br>
<br>
<a class="moz-txt-link-freetext" href="http://focus.ti.com/graphics/mcu/stellaris/Stellaris9000_400.jpg">http://focus.ti.com/graphics/mcu/stellaris/Stellaris9000_400.jpg</a><br>
<br>
It's an ARM chip, you'd want to program it in C, but the (free, and
you get the source) driver libraries it comes with makes even
complicated tasks pretty easy, leveraging a whole bunch of built in
peripherals. <br>
<br>
The 9000 series is a good choice as it's got an integrated 10/100
mbit MAC/PHY, built in ieee1588 timing (a low power alternative to
NTP optimized for microcontrollers good to the sub microsecond),
enough flash for samples and enough ram for buffering, and speaks
i2s (<span class="Apple-style-span" style="border-collapse:
separate; color: rgb(0, 0, 0); font-family: Times; font-style:
normal; font-variant: normal; font-weight: normal; letter-spacing:
normal; line-height: normal; orphans: 2; text-indent: 0px;
text-transform: none; white-space: normal; widows: 2;
word-spacing: 0px; font-size: medium;"><span
class="Apple-style-span" style="color: rgb(82, 82, 82);
font-family: Verdana,Helvetica,sans-serif; font-size: 11px;
line-height: 14px;">Integrated Interchip Sound)</span></span>,
which is like i2c but specifically designed to send PCM data to DACs
for creating CD quality sound. The application notes include two
different ways to get a lightweight IP stack going, and from there
you could just blindly shove data from a UDP socket out the i2s, or
implement some sort of timing to make sure they stay in sync. <br>
<br>
All of the 9000 series chips are less than $10 in quantity, and
other than an external MagJack and DAC with built in amp, all the
parts you'd need. <br>
<br>
The evaluation kit would let you get the entire app up and working,
and is $99 at mouser:<br>
<br>
<a class="moz-txt-link-freetext" href="http://focus.ti.com/graphics/tool/EK_LM3S9B92_8_09.jpg">http://focus.ti.com/graphics/tool/EK_LM3S9B92_8_09.jpg</a><br>
<br>
<a class="moz-txt-link-freetext" href="http://www.mouser.com/ProductDetail/Texas-Instruments/EKC-LM3S9B92/?qs=sGAEpiMZZMtLck3p7ZBovS6coEaHmDWX">http://www.mouser.com/ProductDetail/Texas-Instruments/EKC-LM3S9B92/?qs=sGAEpiMZZMtLck3p7ZBovS6coEaHmDWX</a><br>
<br>
And here's the horrible TI webpage for their lm3s9000 series:<br>
<a class="moz-txt-link-freetext" href="http://focus.ti.com/mcu/docs/mculuminaryfamilynode.tsp?sectionId=95&tabId=2597&familyId=1756&docCategoryId=10&viewType=mostrecent¶mCriteria=no">http://focus.ti.com/mcu/docs/mculuminaryfamilynode.tsp?sectionId=95&tabId=2597&familyId=1756&docCategoryId=10&viewType=mostrecent¶mCriteria=no</a><br>
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