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A simple SR flip flop built using just 2 transistors, and 4 resistors! Works like this: both transistors pose positive feedback to each other identically; initially, they are equally biased, turned on just as much as the other... until you interrupt the amount of curret flowing through one of the transistors, for example: when you press the push button (connected to Vcc) on one of the NPN transistors, it fully saturates for a second, and causes it to turn on, thus pulling current away from the transistor that controls the amount of positive feedback on the one you just saturated for a second, and it latches that way! Pretty cool huh
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