py: regular expressions in python 

>>> import re
>>> ip = re.compile('(\d{1,3})\.(\d+)\.(\d+)\.(\d+)'



>>> x = ip.search('ip: 5.6.7.8')
>>> x is None
False

>>> x = ip.match('ip: 5.6.7.8')
>>> x is None
True



>>> x.groups()
...
('5', '6', '7', '8')



>>> x.group()[2]
'6'

>>> x.group(2)
'6'



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Various synthetisers - schemes  
http://rubidium.dyndns.org/cag/

Temperature compensated antilog circuit
http://www.seekic.com/circuit_diagram/B ... ERTER.html

A BJT is a Current Operated Transistor
http://www.learnabout-electronics.org/b ... ors_06.php


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ICL8049 
http://pdf.dzsc.com/BCJ/ICL8049BCJE.pdf

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DPP 
http://www.epravo.cz/top/clanky/dohoda- ... 79929.html

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REMOTE_USER, REMOTE_HOST 
http://www.perlfect.com/articles/cgi_env.shtml

$ENV{'REMOTE_USER'} will get the user id.



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Split or Bi-polar Power Supply 
http://www.qrp.pops.net/af-amp-2008.asp
http://www.scienceprog.com/dual-polarit ... ly-source/

LM317 Calculator V2.0
http://www.whatcircuits.com/lm317-calculator-v2/


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Voltage Controlled Filter 
http://fluxmonkey.com/electronoize/opampFilter.htm


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Review: 7 password managers for Windows, Mac OS X, iOS, and Android 
http://www.infoworld.com/d/security/rev ... oid-189597



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LM317 / LM338 / LM350 Voltage/Current Regulator Calculator 
http://diyaudioprojects.com/Technical/V ... Regulator/

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On Zener diodes 
http://www.youtube.com/watch?v=GfaVbKaw5Nk&t=20m45s

http://www.opamplabs.com/zenerreg.htm

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