RC value in 555 timer ? | Electronics › Electronics › RC value in 555 timer ? This topic has 1 reply, 2 voices, and was last updated 5 years, 4 months ago by GANEEV SINGH. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts June 13, 2011 at 7:42 am #1002 Muhammad Faheem ArshadParticipant how to set RC value for 555 timer in order to generate 300 us pulse February 5, 2018 at 2:06 pm #14722 GANEEV SINGHParticipant Hi For a 300us pulse with arround 60% duty cycle the RC values will be: R1=1KOhm (resistor between reset and discharge pin of 555) R2=1.5KOhm (resistor between discharge and threshold/trigger pin of 555) C=0.1uF Author Posts Viewing 2 posts - 1 through 2 (of 2 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In