Coin Cell circuit to blink LED forever

Submitted by Holic on Mon, 12/02/2019 - 16:04

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 ? 

Hi Holic, Try this circuit.


  Joined August 22, 2019      125
Thursday at 12:29 PM



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. 

  Joined November 07, 2019      124
Thursday at 04:25 PM

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.

  Joined April 09, 2020      55
Thursday at 02:40 PM