# 555 Timer chip 3 second delay.

**URL:** <https://community.sparkfun.com/t/555-timer-chip-3-second-delay/28790>\
**Category:** Projects\
**Created:** [May 17, 2014, 7:11pm UTC](https://community.sparkfun.com/t/555-timer-chip-3-second-delay/28790 "2014-05-17T19:11:34Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![reddot234](https://avatars.discourse-cdn.com/v4/letter/r/eb9ed0/32.png) [@reddot234](https://community.sparkfun.com/u/reddot234)\
**Post date:** [May 17, 2014, 7:11pm UTC](https://community.sparkfun.com/t/555-timer-chip-3-second-delay/28790/1 "2014-05-17T19:11:34Z")

</div>

Hello, I’m trying to use this guide: [http://www.dummies.com/DummiesArticle/E … 10974.html](http://www.dummies.com/DummiesArticle/Electronics-Projects-How-to-Make-an-LED-Flasher-Using-a-Timer-Chip.id-309311,navId-810974.html) to make 2 LEDs switch on and off. What capacitors/resistors would I need to make the delay 3 seconds? Thanks in advance!

---

<div class="post-metadata">

**Author:** ![Mee\_n\_Mac](https://avatars.discourse-cdn.com/v4/letter/m/aeb1de/32.png) [@Mee\_n\_Mac](https://community.sparkfun.com/u/Mee_n_Mac)\
**Post date:** [May 20, 2014, 6:11am UTC](https://community.sparkfun.com/t/555-timer-chip-3-second-delay/28790/2 "2014-05-20T06:11:28Z")

</div>

> reddot234:  
> Hello, I’m trying to use this guide: [http://www.dummies.com/DummiesArticle/E … 10974.html](http://www.dummies.com/DummiesArticle/Electronics-Projects-How-to-Make-an-LED-Flasher-Using-a-Timer-Chip.id-309311,navId-810974.html) to make 2 LEDs switch on and off. What capacitors/resistors would I need to make the delay 3 seconds? Thanks in advance!

The duty cycle and period of a 555 timer circuit is well defined and well published on the WWW. Google is your friend. I

even have a 555 application sitting at-the-ready on my desktop. You can too.