2×2 LED Matrix circuit diagram
Finally able to decipher what it did, and got Joe the Bro to help explain it.
Note: the 2N2222 transistor is a NPN (not pointing in) BJT (bipolar junction transistor). Collector is negative, base is positive, emitter is negative. Technically, the flow of current is from positive to negative in a diode, but the application of a current to the base AND a current being applied to the collector will enable saturation of the middle layer of the transistor sandwich and permit flow from the collector to the emitter.
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