Wrong frequency is simulated

[Sersal]

Hello,

I've circuit based on 555 timer which should generate 40kHz (50% DC) square wave.

But Multisim simulate 26.367 Khz only.

Circuit calculated by "Tools/Circuit Wizard/555 Timer Wizard/" and verified with datasheet.

This circuit assemblied on real maket board and works fine.

Multisim version is 10.1.1

So, what's wrong here?

Thanks,

Sergey

 

[Tien_P · Accepted solution]

Hi,

I built the circuit using the shown component values and I was able to get the circuit to produce the right reading by changing the time step(TMAX) from 1e-5sec to 1e-8 sec, this setting is under Simulate>>Interactive Simulation settings.  By reducing the time step you are telling the simulator to take more samples and gave and more accurate reading.

[Sersal]

Solved!

TNX!!!