rS trigger using discrete elements
Truth table
R S R/S
0 0 N (no shift)
0 1 n+1
1 0 n-1
1 1 forbidden (unknown result) n+/-1
It is constructed similarly to an astable multivibrator but it does not self oscillate but utilises an RC circuit to either saturate or desaturate one of the transistor depending on the diode's direction which leads to a shift in the trigger's state. In this specific configuration the diode only pasdes the negative part of the pulse thus desaturating the given transistor
