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Project Notes

#559 Slow Glow

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

Build

Here’s a quick demo..

clip

Notes

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.

Construction

Breadboard

Schematic

Build

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!).

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