Mattew,
a brief google search "555 negative voltage" give me these lin=
ks (are similar circuits but some are better explained):


http://ourw=
orld.compuserve.com/homepages/Bill_Bowden/page10.htm

http://www.csgnet=
work.com/ne555c1.html

http://www.smoke.com.au/~ic/neg-volt-gen.html=0D
=

http://www.newstead.tased.edu.au/oldweb/curriculum/Electronics/Advanced=
/sect6.htm

............
............

The 555 is a bit noisy,  use =
CMOS version if you don't need highest current otput

regards
Marco=0D
=




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