Hi @alexpikkert and @JackANDJude and everyone reading this,
Here's another clue to solve the mystery : We need following bits to make the circuit work
Pulse bit, output bit ( LED, IR receiver, Number bit, ...), power bit, threshold bit, random bit.
Put these together in the correct order with the correct setting et voilà
Ans as mentioned above, you need the number bit to make fine adjustments !
Good luck !