Transistor biasing 
http://www-personal.engin.umd.umich.edu ... 20Bias.pdf

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http://www.till.com/articles/moog/patents.html patents :D 
http://www.till.com/articles/moog/patents.html

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MCP601/602/603 rail to rail opamp (single sourced) oscillator circuit schematics 
picture below shows oscillator which uses rail to rail opamp MCP601/MCP602/MCP603 powered with single source (virtual ground).



http://youtu.be/QLQrLO0zvDI
<- nice explanation why oscillator starts oscillation. it is important to provide circuit with +/- Voltage otherwise capacitor will not start the cycle of chaging and discharging controlled by opamps output voltage.




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VCO 
http://www.falstad.com/circuit/e-vco.html

http://hyperphysics.phy-astr.gsu.edu/hb ... re.html#c2

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Oscilating opamp 
http://www.falstad.com/circuit/#%24+1+5 ... 25+0+-1%0A

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Op Amp circuit collection 
Clear opamp explanation
http://talkingelectronics.com/projects/ ... AMP-1.html

http://www.ti.com/ww/en/bobpease/assets/AN-31.pdf

http://www.physics.unlv.edu/~bill/PHYS483/op-amps.pdf

http://www.allaboutcircuits.com/vol_6/chpt_5/17.html

http://www.electronics-tutorials.ws/opamp/opamp_1.html

http://www.analog.com/static/imported-f ... MT-038.pdf

Divided feedback
http://www.allaboutcircuits.com/vol_3/chpt_8/5.html

Simulating opamp
http://eecs.oregonstate.edu/education/d ... %20amp.pdf

Powering LM358
http://www.physicsforums.com/showthread.php?t=483644

Výroba plošných spojů
http://www.tistaky.cz/

OpAmp audio tests
http://tangentsoft.net/audio/opamps.html#627

Juno DCO
http://www.electricdruid.net/index.php? ... o.junodcos

Analog synth service manual
http://manuals.fdiskc.com/flat/

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Some Py code 
#!/usr/bin/python
__version__ = '0.1'
__author__ = ''

import sys
import re
import time
import datetime
import smtplib
import email


date = ( datetime.datetime.today() - datetime.timedelta(days=1) ).strftime('%F')
acs_log_files = ( "/var/log/%s/file1" % date, "/var/log/%s/file2" % date )

def send_alert( msg, date ):
sender = 'root@domain.com'
receivers = [ 'user1@domain.com', 'user2@domain.com' ]

message = """From: Root <root@>
Subject: ACS logon information ( %s )
%s
""" % ( date, msg )


try:
smtpObj = smtplib.SMTP('localhost')
smtpObj.sendmail( sender, receivers, message )
print "Successfully sent email"
print
print message
except SMTPException:
print "Error: unable to send email"



def analyze_line( line ):
if re.search( "User=xx|User=yy", line):

msg = re.split( "CSCOacs_TACACS_Accounting", line )
acs_date = msg[0]

r = re.compile('Remote-Address=([^,]*)')
acs_remote_ip = r.search( line )

r = re.compile('User=([^,]*)')
acs_user = r.search( line )
ret = ( "Successful logon to ACS on", acs_date.rstrip(), "from", acs_remote_ip.group(1), "with account", acs_user.group(1) )
return( " ".join( ret ) )
return

for acs_log_file in acs_log_files:
try:
acs_log_file_handle = open( acs_log_file, 'r')

for line in acs_log_file_handle:
if re.search( "CSCOacs_TACACS_Accounting", line ):
if re.search( "Accounting START", line ):
msg = analyze_line( line )
''' Accounting START || Accounting STOP '''
if msg:
send_alert( msg, date )
acs_log_file_handle.close()

except IOError:
print "Cannot open file %s" % acs_log_file
send_alert( "Cannot open file %s" % acs_log_file, date )


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Gottwaldova 


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Sunflowers 


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What is the difference between UNIX Access, Modify, and Change Times?  
# stat a
File: `a'
Size: 4096 Blocks: 16 IO Block: 4096 directory
Device: 6801h/26625d Inode: 2768987 Links: 3
Access: (0755/drwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2012-08-07 18:26:30.000000000 +0200
Modify: 2011-12-01 11:38:24.000000000 +0100
Change: 2012-08-06 07:22:39.000000000 +0200


Access Time | atime | -ul
This is the time that the file was last accessed, read or written to.

Modify Time | mtime | -l
This is the time that the inode information (permissions, name, etc., the metadata, as it were) was last modified.

Change Time | ctime | -cl
This is the last time the actual contents of the file were last modified.



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