Problem in BJT switching in Simulink

[ultraviolet_ray]

Hello friends,

I am trying to simulate a simple switching circuit using NPN BJT in Simulink ,the control input being a clock with gain 3. The BJT seems to remain at a single voltage without switching . I cant really figure why it is doing so. Any help would be appreciated.
Further can anyone tell me how I can upload .mdl files from Simulink? What I have done is copy pasted the .mdl code in text file and uploaded because the up-loader gave an invalid file warning (File attached)

Thank you!

 

[eiphan]

How about you do "print screen" to simulink model file and post as picture file such as jpeg or png....