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tunik123
2 years ago

Your feeling doesn’t touch you 😉

At 1 it is exactly the opposite. If the button is not pressed, current flows via the 4.7 kOhm into the besis and, the LED is on. The button closes the base against ground short and the LED goes out.

At the 2 the LED2 is guaranteed when the button 2 is pressed. What happens when the button 2 is not pressed depends on LED 1 . When key 1 is open, LED1 is applied, the collector of T1 is (almost) to ground and LED2 is out.

If key 2 is not pressed, LED 2 is exactly on when LED 1 is out.

The circuit 3 (bistable flip-flop, also called flip-flop) now comes. This is where the cat bites in the tail. If no button is pressed, then LED1 is activated exactly when LED2 is out and vice versa. Which LED is on and which is off can not be predicted. By actuating a button, however, it is possible to force which LED is on and which is out. This state is also maintained when the button is released. In the value table, for the “no button pressed” state, it is necessary to point out that the LEDs are maintained, no matter how it is currently.