_http://www.daycounter.com/Calculators/NE555-Calculator.phtml_
_http://www.eleinmec.com/article.asp?1_
_http://www.kpsec.freeuk.com/555timer.htm_
_http://www.world-class-programme.com/555-Timer.asp_
_http://www.falstad.com/circuit/e-555square.html_
_http://www.doctronics.co.uk/555.htm_


Craig Smith
Electrician
Advanced Engineering Center

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