flip-flop SR

*In this circuit, one of the transistors is on and the other is off; *If Q1 is on, its collector voltage (NQ) is almost 0, and Q2 base current is 0 as well; *Due to it, Q2 is off and its collector voltage (Q) has a high level; *This voltage generates an elevated current in Q1 base, keeping it on; *Using the R and S inputs makes it possible to change Q and NQ values; *Applying high level on S, Q1 is on and Q2 is off; *Then, Q is high and NQ is low. The high level on S can be removed because Q1 keeps Q2 off; *Applying high level on R, Q1 is off and Q2 is on; *Then, Q is low and NQ is high. The high level on R can be removed because Q2 keeps Q1 off; *The output leds are activated by voltage followers to avoid load effect on the SR circuit;