my recent reads..

Atomic Accidents: A History of Nuclear Meltdowns and Disasters; From the Ozark Mountains to Fukushima
Power Sources and Supplies: World Class Designs
Red Storm Rising
Locked On
Analog Circuits Cookbook
The Teeth Of The Tiger
Sharpe's Gold
Without Remorse
Practical Oscillator Handbook
Red Rabbit

Sunday, February 28, 2016

LittleArduinoProjects#191 glowing LEDs on 1.5V

So for another project I wanted some "glowing" LEDs, ideally powered from a single 1.5V AA or AAA battery. That seemed like an interesting challenge, especially when the forward voltage of the LEDs I'm using is about 2.1V.

I had a feeling I could cobble together a couple of ideas (Relaxation Joule Thief and RC Oscillator) .. and lo, it works!

As always, all notes, schematics and code are in the Little Arduino Projects repo on GitHub.

Here's a glimpse of the "modified oscillation". CH2 (red) is the LED cathode/transistor collector - as it rises and falls the LED slowly switches off then back on.

For protoboard-based builds I tend to layout the schematic with PAD tools (Pencil-Aided Design) ...

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