Coin Cell circuit to blink LED forever

Holic's picture


Joined: Dec 02, 2019

Replies: 0
Coin Cell circuit to blink LED forever
December 2, 2019 - 4:04pm

Hi, can someone help me make a led blink forever with coincell. I have a red colour LED with a simple coin cell (used in watch) that I would like to use on my thanksgiving gift. This LED should be blinking forever (atleats for a month). When i connect the LED to coin cell it glows bright but i want it to blink, so how to make the led blink with coin cell ? 

Debasis Parida's picture


Joined: Aug 22, 2019

Replies: 125

Hi Holic, Try this circuit.


Sourav Gupta's picture


Joined: Feb 12, 2018

Replies: 646


Use a 1Hz flashing LED. Cost very less, simple LED, directly connect with battery and enjoy.

Easy to use, efficient, Cost very less (1.5/- to 2/- INR in West Bengal) and beautiful.

jaksonlee's picture


Joined: Nov 07, 2019

Replies: 124

The LM3909 boasted the ability to flash an LED for over a year using a single C battery. That part is now long out of production, so [Dillon] has implemented the LM3909 circuit using discrete components on a small PCB designed to take pins and fit the footprint of the original. Today you can buy flashing LEDs; a simple two-lead component that requires only a power supply to produce even flashes of light. They look for all the world like any other LED, though embedded in the plastic dome is an integrated circuit to do all that flashing work. here was a time though when a flashing LED was something of a big deal, so much so that National Semiconductor produced a dedicated chip for the task. 

Muhammad Umar's picture


Joined: Apr 09, 2020

Replies: 55

Hi Holic! You can do this by using IC NE555 in any of its modes i.e., it works in monostable, bi-stable and a stable mode. There is a formula for each mode, you can choose the values of resistors and capacitors to produce specific frequency signal to control blink rate of output i.e., in your case the LED. Few years back, I created led lightning for an event. During this whole, I got assistance from SSLA. This technique is very low cost and affordable.