Made a simple touch delay multisim14 lamp simulation circuit, the use is composed of two 555 monostable trigger cascade, but the simulation process is very slow, adjust the step function is also; Then I adjusted the interactive simulation of the Initial, the conditions of the selected set to zero, the simulation speed suddenly the normal; Brings new problems, however, is a time when the initial, two differential circuit are difficult to express the falling edge of the a should not appear, consult everybody this is how to return a responsibility? Initial the conditions this setting is stem what of?
Circuit diagram is as follows:

The simulation results are as follows:

Figure in the circle where there was a wrong obviously edge (because of the C channel measurement is secondary circuit input differential signal, and the input of the secondary circuit is the output of the primary circuit, see figure 1 circuit output channel (B) in the zero moment didn't mutate)
The ideal simulation results are as follows:

This is to use make multisim12 circuit, the circuit components and parameters are the same; Difference between multisim12 don't set the initial the conditions for the set to zero as normal speed run, but if set set to zero, and 14 version of the same problems will occur