![]() There is no need for current limiting resistors, as the chip takes care of current regulation. Connect the cathode of an LED to these pins and tie the other pin of the LED - the anode - to your voltage supply. The LED outputs are all open-collectors, so they sink current. Other pins may require a resistor or two to set constant current or voltage values. Many of those pins can either be tied to ground, V CC, or even left floating. That may seem a daunting list of pins and reference voltages to supply, but in reality it can be very simple. Here is an overview of the chip's pinout: Pin # The remaining pins are used for power, reference voltages, and control of the IC. Over half of the pins are in charge of driving the LEDs. Working with these ICs is fairly simple - no crazy microcontrollers or programming required! Here are a few basic electronics concepts you should be familiar with, before moving forward: Breadboard Power Supply (with male headers soldered in).5V AC Adapter and Barrel Jack Adapter -or.Potentiometer (or any sensor that can produce an analog signal). ![]() ![]()
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