A Beginner's Guide to Driving LEDs - Part 4





The transistor as current sourceIn part 3 of this tutorial we looked briefly at several current sources, which contain integrated circuits. In this part, we will look in more detail at a simple current source built from a transistor, a zener diode and two resistors.
The basic principle for this circuit is to start with a fixed reference voltage. This voltage is then translated to a fixed

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