User manual

37
Fig. 27: Basic principle
of the RS flipflop
In the actually set up circuit, both outputs are put to LEDs. At the output
of NAND 2, the inverted condition of NAND 1 appears at all times. Two
resistors against Vcc ensure quiescent state 1. The pushbuttons can
force a 0-condition and therefore change the output condition. When
switching on the operating voltage, one of the two LEDs lights up — it
is not possible to tell in advance, which one. Both buttons can be used
to switch between the two conditions then.