Arbitrary links

I occasionally come across interesting sites on various topics but don't have any way to keep track of them. I thought I'd try just keeping some lists here and see how that goes.

Science & Technology

Audio

Digital interfaces for audio

S/PDIF: http://en.wikipedia.org/wiki/SPDIF
    Biphase mark code: http://en.wikipedia.org/wiki/Biphase_mark_code
    Manchester: http://en.wikipedia.org/wiki/Manchester_code
    Circuit interfaces: http://www.hardwarebook.info/S/PDIF
    USB I/O for PC: http://www.andrewkilpatrick.org/mind/spdif/reviews/edirol_ua1d/
    S/PDIF -> analog converter: http://sound.westhost.com/project85.htm
    Crystal CS8413/4 data sheet: http://www.cirrus.com/en/pubs/proDatasheet/8413-4.pdf
Philips UDA 1355H Stereo CODEC with S/PDIF: http://download.siliconexpert.com/pdfs/quickdata/phi/uda1355h_1.pdf Datasheet: http://www.nxp.com/acrobat_download/datasheets/UDA1355H_1.pdf
AES/EBU:  http://en.wikipedia.org/wiki/AES/EBU
IEC 60958-3
TOSLINK: http://en.wikipedia.org/wiki/TOSLINK
ADAT: http://en.wikipedia.org/wiki/ADAT
Burr-Brown PCM2900 CODEC, USB, S/PDIF: http://focus.ti.com/lit/ds/symlink/pcm2902.pdf

Microphone pre-amp circuits

Phantom PSU: http://www.new-line.nl/default.asp?i=61

Balanced pre-amp with phantom power: http://www.nomad.ee/micros/preamp1.html

Discussion about design: http://users.rcn.com/rhcamp/howhymm3B.htm

Pre-amp kit: http://www.fivefish.net/diy/sc1/ Assembly guide: http://www.fivefish.net/diy/sc1/pdf/SC1Assembly.pdf

Preamp project (for low Z mics) with cct diag (PCBs avail): http://sound.westhost.com/project66.htm

Good article on patented amp design: http://www.jensen-transformers.com/an/ingenaes.pdf

Great idea to put a FET preamp at the guitar head: http://www.till.com/articles/PreampCable/

Discrete FET guitar preamp cct: http://www.till.com/articles/GuitarPreamp/index.html

Comments on phantom powering: http://www.uneeda-audio.com/phantom/

Generic phantom power ccts: http://www.uneeda-audio.com/phantom/phan03.gif

USB

Web site: www.usb.org
Developer's area: http://www.usb.org/developers
USB in a nutshell: http://www.beyondlogic.org/usbnutshell/usb1.htm

Math & Physics

Interesting math blog by Mark Dominus with some excellent brain-stretching discussions.

Graph Theory

Petri Net World - Everything you always wanted to know about Petri Nets