Schematic and PCB CAD
http://www.expresspcb.com
They provide Free software for Schematic and PCB.
The limitation is you can not make Garber file, only they can produce PCB.
Price is adequate, and shipping is very fast.

Parts Supply
http://www.digikey.com
I check Digikey 1st

http://www.mouser.com/
Then search mouser.

For Audio terminals,
http://www.partsexpress.com/

Development tools
http://www.sparkfun.com/commerce/categories.php
http://www.ucpros.com/

Sound Software
http://audacity.sourceforge.net/
Audacity Free Audio Editor and Recorder

http://www.ne.jp/asahi/fa/efu/soft/ws/WS140.ZIP
WaveSpectra, can do FFT.

http://www.portaudio.com
very nice audio API library, you can handle DirectSound multichannel with simplified steps.

Analog Simulation
http://www.linear.com/designtools/software/
Linear Technology, Free Spice.

MCU
http://www.microchip.com/
dsPIC33 : Recommended for small signal processing application.
PIC18F : Recommended for I2C control application.
See ICD2 for programmer / debugger.
See MPLAB IDE, C30, C18 for C development.

http://www.atmel.com/
ATMega : has many IO pins. recommended for application with LCD display.
See AVR Studio, AVRGCC for C programming.
Programmer is here.
http://microcontrollershop.com/product_info.php?cPath=110_53&products_id=1106
AVRJTAG + ISP.

CPLD/FPGA
http://www.xilinx.com/
ISE WebPack : Free Software for CPLD / FPGAs.
SparkFun or many company have programmer.
http://www.sparkfun.com/commerce/product_info.php?products_id=8460

GPU Computing
http://www.nvidia.com/object/cuda_home.html
home for CUDA GPU computing.

Front / Rear Panel
http://www.frontpanelexpress.com/
Same as ExpressPCB, they provide free CAD software to design Alminum Panel, dedicated for their factory.

FPGA Board
http://www.fpga4fun.com/index.html
They are proiding very easy and cheap board.
Detailed documents / softwares URL will be noticed after ordering.
(They don't provide actual schematic, only pin maps)

Most important?
http://www.ti.com
See Digital Amplifier Solutions, for Full digital amplifier components.

Windows Software development
Microsoft Visual Studio 2005 Professional.


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