How to make a 555 IC work in Monostable mode?

[Arkonite]

I'm trying to simulate a 2-stage Multivibrator using the 555 IC with the first stage being in Astable mode while the 2nd stage is in Monostable mode. So far, I have only been able to make the Astable portion work. When connecting the Monostable part to the output of the Astable stage, the LED just continues to flicker non-stop which goes against my theoretical calculations. It also breaks the simulation because when I disconnect the Monostable stage, the Astable no longer works. I have attached below my simulations. The goal is to have the 1st stage at 1 Hz and the 2nd stage at 0.5 Hz. Both stages must also have a 50% DC. I have already modified the maximum time step to 1 second and checked to make sure that the Astable stage runs  at 1 Hz with a 50% DC. Even when using Multisim's circuit builder, I'd still just get 0 V at the output of the Monostable mode.

[GGoodwin]

Hi Arkonite,

I don't have Multisim (Desktop) application so I can't open the circuits that you attached.

An example of cascaded 555 Astable and 555 Monostable multivibrators is 556 (Dual 555) PWM Generator.

If you are trying to create a square wave generator using a 555 astable multivibrator then divide it by 2 using a 555 monostable multivibrator you might want to study the circuit 

555 Frequency Divider first.

You can post the images of your circuits. I'm hoping that we can find the cause of the problems that you stated.

Nevertheless, carefully analyze if your goal is achievable. Did you try researching first for any existing 555 Divide-By-2 50% Duty Cycle Output circuit (which uses only 555 Timer and no toggle Flip-flop). The quasi-stable period of your monostable multivibrator should be 1 second (for 50% duty cycle) but the period of your astable multivibrator is also 1 second. This means that triggering occurs exactly when the quasi-stable period expires.

Best regards,

G. Goodwin