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Actively Stabilizing the Current In part 2 of this tutorial we found that there are situations, when a simple resistor is not good enough to keep the current through an LED stable. There are countless ways to stabilise the electrical current actively. Some are simple, some are complicated. I will show a few here. Note: The LED in the following schematics generates red light and has a

Resistance is not futile... Part 1 of this tutorial showed why using an LED is not as straight forward as using a light bulb. Now we have a look at different ways to operate an LED. The simplest and well known way to operate an LED is to add a series resistor. It is quite easy to determine the value for this resistor: Start with the operating point of the LED. E.g. an LED might have a

Introduction LEDs are just great. Nowadays they are cheap, durable and power efficient. You get them in all colours, shapes and sizes. But along with all the advantages comes a disadvantage, too. LEDs have special demands when it comes to their power supply. In most cases, this is not too bad. But many beginners in electronics have problems to understand those requirements. With this post I