Simple simulation Flip Flop. Flashing LED problem

Hello!

I have a problem on the simulation of a circuit simple flip flop. The output is connected to a LED for the indication of the output. However, the lights just keep blinking which gives me the impression that the output is not stable (which from my analysis, the production should be stable). I'll post a picture and the file multisim for you to see the circuit. Thank you!

I don't have a Multisim, so I can't comment on the issues of simulation directly.

I was about to raise the issue of V/15 V 5.  As well, a typical LED work to 1.6 to 3 V according to color (and thus the composition of semiconductor). Try LEDs by car directly from the output of a 4011 will cause problems (in a physical circuit). The current Ioh source for the 4011 is 8.8 my typical and 3.4 my minimum at 15 V, assuming the Voh = 13.5 V.  A typical LED voltage current could rise to 32 my (~0.5 dissipation W!) until the device goes up in smoke! But with tension that low, the logic of feedback will not work because the output voltages will always be below the other door entries.

The simulation does not reflect accurately the limits of current and voltage outputs.

When I put in place a fast simulation of logic in LabVIEW, I find that there are some unstable States. This logic includes a delay effect, but assume ideal logic levels.

Lynn

Tags: NI Software

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