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I am trying to model the cutoff mode of an NPN transistor with a switch that is connected to the base. Unfortunately, it shows current going through. I am using ORCAD Capture. enter image description here

Does anyone know how to fix this? I should see zero current from the connector to the emitter.

I really don't know how the switch works in PSPICE. From what I found on the internet the symbol means that it opens at time t. Where should I define the time t? I googled and couldn't find an answer. The name of the switch is sw_tOpen and can be found in ANL_MISC library.

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  • \$\begingroup\$ Are you sure that source is properly grounded? Move it around, see if the wires "stick". \$\endgroup\$ – a concerned citizen Apr 4 at 10:42
  • \$\begingroup\$ Yes I am sure it is connected because it gives me the right numbers when I replace the switch with wire \$\endgroup\$ – Jack Apr 4 at 14:49
  • \$\begingroup\$ You know, it would help you immensly to first learn, even a little bit about the tool you're about to use. Editing components should be part of the basics. \$\endgroup\$ – a concerned citizen Apr 4 at 15:48
  • \$\begingroup\$ I am quite familiar with PSPICE and know what I am doing. I just have a question along the way, which no one could answer so far. \$\endgroup\$ – Jack Apr 4 at 16:10
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If you search the net for the PSpice manual you'll eventually run into this link. I don't know the name of that switch, and it looks like it's not a current, or voltage controlled one, but with the manual you should be able to find it and its usage (I don't have PSpice).

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Ok, I got it. Since the switch closes at time=0s it shows the result for when the switch is closed. I had to use the current probe to see the current over time. It will go to zero after some nanoseconds.

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