NE555 Wikipedia
http://en.wikipedia.org/wiki/555_timer_IC
NE555 Application Note AN170
http://www.555-timer-circuits.com/datasheets/555an.pdf
NE555 Datasheet
http://www.ti.com/lit/ds/symlink/ne555.pdf
NE555 Calculator
http://ekalk.info/555a_en.html
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