Hi guys, First post in this part of the forums (I think) but no doubt not my last as I embark upon this next project...and most will be asking for help! Not content to network my Giotto coffee machine via an Arduino (still not complete and 3 years in the making..but oh so close!), I have embarked upon another project. I have decided to create my own whole house audio system. It is a centralised system with existing speaker wires to the zones. The basic functionality of the system is: * at least six stereo sources * web interface * ethernet controled * at least 4 zones * at least 25w per zone * goodquality audio, but not audiophile...it's mostly background music after all * all the usual zone controls (link/separate source for zones, sep/linked volume, smart/soft mute for doorbell/phone etc.) * provide stateful information to my home automation platform (Command Fusion as the GUI and opensourceautomation as the back-end. * smart power management * is cost-effective (<$300 all up) Unfortunately after an extensive search and attempts to jury rig various components together, it was clear that this was not going to be possible with any of the commercial systems available today. I had to build my own. Strangely, there don't seem to be too many people who have created a system like the above. Well at least not those who have published it on the web. There are a few bits out there though and I will post references and sources in a later posts. I have the basics designed and there are really five building blocks 1) Matrix audio switch ($15 MT8816) 2) Pre-amp ($3 Brown BurrPGA2310) 3) power amp ($20Sure 25w Class-T...well class D Very nice little unit actually!) 4) Controler (free from a mate Freetronics LeoStick (Arduino) + RasberyPi for web duties) 5) Power is via a $47 +15v RS-150w MeanWell from power-supplies-australia and various regulators and a couple of $3 TC7662B charge pumps for creating -ve voltages. Sad how the PSU is the most expensive part by far...and is a bit noisy if you ask me so may look at that...(or not). I have the parts for 2, 3 and 4...and am awaiting 1) in the next few days. It all (seems) pretty straight forward stuff when you break it down...but will be a hoot once I get it all together. Once I get the basics done, I'll create a schematic and get some PCB's made. I already have the case for it. This guy has done some good research into the PGA2310..incl. this pre/post op amp. circuit. Click to view full size! Here's the desk at the moment... Click to view full size! and the arduino controlled pre-amp./volume control. yes messy, but it IS a prototype board after all! Click to view full size! I'll post as I go and would be great to get some of the experinced guru's on here to help guide the project - so feel free to post any suggestions or thoughts on improvements. Also, if anyone wants to partner up and help with the build, drop me a line - it would be great to share the build fun! PS. that is my project desk, my main PC setup is on the other side of the room. The desk is a custom made job from progressive office furnature and they did a fantastic job from my rather unique SolidWorks drawings (they even assembled and installed it!) and it was worth every cent to have a dedicated place for projects. I 110% recomend them for any desks esp. custom jobs. Next add-on is a wall unit above it for "stuff". Disclaimer : I am a hack but I do love to learn - so be kind if I c*ck upand offend any electronic engineers out there. Oh, and this is my music server... I use a J.River media centre on a cheap and low power D510 headless all in one mobo with two USB DAC's for two zone audio output...can expand to "n" zones if needed but two simultanious plays is likely enough. Click to view full size! Click to view full size! I control it with ipad's and CommandFusion for most stuff and this remote app http://www.jremote.net/ for more complex music management. Click to view full size! Awe crap...PPS...I forgot to mention I will grab a few of these arduino controllable FM Modules too and add them into the mix so i also have networked control of multiple FM sources. Double Bugger...I just ordered some stuff from Sparkfun and forgot to get these!