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Fig. 57: Setup with four LEDs
20 One of Four
For only one of the four LEDs to be lit at a time, the two LEDs at the
right of the circuit diagram must be switched between the two flipflops
accordingly. For the two remaining switching phases to be decodable,
the lower flipflop's inverted output /Q is used.
Output Q2
Output Q1
Numeric
value
LED 1
LED 2
LED 3
LED 4
1
0
2
1
0
0
0
1
1
3
0
0
0
1