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 ?
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Coin Cell circuit to blink LED forever
December 2, 2019 - 4:04pm
Replies: 60
Hi Holic, Try this circuit.
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https://lighthouseleds.com/led-component-lighting/animated-leds-flashing...
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.
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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.
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