555 Timer ICAstable Operation (Operates like an oscillator)Design Approach: 1. Choose C to get the frequency range you want2. Choose RB to get the required frequency3. Choose RA ~0.1RB (1 kOhm min)If you want to use a pot, make it RB.(http://www.kpsec.freeuk.com/555timer.htm and table)BJ Furman | ME 106 Intro to Mechatronics | handout_555_timer.docx |11DEC2013 Page 1 of 2 CRRTfBA249.11 CRtCRRtBLowBAHigh69.069.0LowHighttT Source: Philips NE555 and NE556 applications note AN 170Mono-stable Operation (One shot)Period, T (output high) = 1.1 RCNotes:1. Tie Reset to Vcc unless you need to reset the outputReferences: http://www.sentex.ca/~mec1995/gadgets/555/555.html http://www.kpsec.freeuk.com/555timer.htm http://www.electronics-tutorials.com/devices/555.htmhttp://www.williamson-labs.com/555-tutorial.htmhttp://www.doctronics.co.uk/pdf_files/555an.pdf http://www.national.com/mpf/LM/LM555.html https://homepages.westminster.org.uk/electronics/555.htmBJ Furman | ME 106 Intro to Mechatronics | handout_555_timer.docx |11DEC2013 Page 2 of 2Source: Philips NE555 and NE556 applications note AN
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