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Project Notes

#559 Slow Glow

A simple slowly-glowing LED effect using a 555 timer.


Here’s a quick demo..



This is a simple circuit that flashes an LED at a fairly slow rate (0.5Hz) with ~50% duty cycle.

A 555 timer provides the oscillation, with R1=4.7k, R2=330k and C1=4.7uF.

The “glow” effect is achieved with a RC filter with time constant (𝛕) of about 103ms.





Credits and References

About LEAP#559 555 TimerLED
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This page is a web-friendly rendering of my project notes shared in the LEAP GitHub repository.

LEAP is just my personal collection of projects, usually involving an Arduino or other microprocessor in one way or another. Some are full-blown projects, while many are trivial breadboard experiments, intended to learn and explore something interesting (IMHO!).

The projects are usually inspired by things found wild on the net, or ideas from the sources such as:

Feel free to borrow liberally, and if you spot any issues do let me know. See the individual projects for credits where due. There are even now a few projects contributed by others - send your own over in a pull request if you would also like to add to this collection.