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This is one of the many color sequences this unit can produce.
The unit is a little over 4 inches in diameter.
[Sources] HackedGadgets via TheLEDart
Wirespondence, Serial Bluetooth with a Micro, Analog Front End, AM/FM Receiver Restoration
Selected questions from past Q&A columns.
Need to brush up on your electronics principles? These multi-part series may be just what you need!