Multisim and Ultiboard

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555 timer circuit is not able to reset in multism


I have trying to test simple set and reset using IC 555 timer. Below is the link of the circuit:


In the circuit the IC is not able to reset (using switch S2) once it is set by toggling switch S1

Step to reproduce:

1. Toggle the switch S1 to ground. Led will glow

2. Toggle back switch S1 to Vcc. Led will still glow

3. Now press and release reset switch (S2). Led still glow. Why is it so?

After resetting led should not glow as TRIGGER pin is connected to VCC.


The same problem occurs in Multism desktop version also. Attached screenshot.


The similar circuit works properly in Proteus. Why is it not working in Multism? or Is there anything wrong in the circuit?


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