555 LED Flasher

Published:2013/9/4 20:02:00 Author:lynne | Keyword: 555 LED Flasher | From:SeekIC

This is a small size led flasher built with the 555 timer IC that is powered from 2 x 1.5V batteries. The circuit can be used as a flashing metronome, dark room timer, memo-reminder or other similar applications. The IC is connected as a astable multivibrator with a duty cycle of about 10%.In figure 1 the LED will be ON for a short period of time and OFF for a longer period. The duty cycle can be reversed if the LED is connected as shown in figure 2 but the battery consumption will also increase due to the fact that the LED will stay ON for a longer period of time. in figure 3 for a variable flash rate, replace the 220k pot with a 220k in series with a 22k resistor. And that is a simple 555 led flasher circuit.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/555_Circuit/555_LED_Flasher.html

Print this Page | Comments | Reading(3)