Somethings wrong with my simulation?

[the_risk_master]

24-hour digital clock in multisim

Hi, Im trying to simulate a 24-hour digital clock with multiSim, but somethings wrong... Help me

 

[E-design]

Something seems wrong with the model of the 7447N, cause grounding the lamp-test pin should force all the outputs to GND, but for some reason they remain high. So the model is not switching the outputs.

As a test I replaced the first 7447N with a 4511B, added some 330Ω current limiting resistors and used this with a common cathode display. Running the simulation, I could get this digit to count something.

 

[the_risk_master]

Thank You Sir E-Design for helpin' out...

 

[mimomod]

Hi E-Design,

could you tell me what software did you use for simulating the circuit? Thanks in advance.

best

 

[the_risk_master]

Its called MultiSim...