A Single Trigger Source Using Binary Flip-Flop
Mohan Lal, R. Parshad · IETE Journal of Research · 1976
By increasing the recovery time of a saturated flip-flop circuit and changing its state by a resistance connected between one of its collectors and ground by means of a mechanical switch, single triggers of both the polarities can be simply generated. In this way, each manipulation of a switch generates a single pair of positive and negative triggers, each polarity being brought out at a separate output.