The Inherit From drop list provides menu choices you can select to either create a new simulation from scratch or by copying a simulation profile from another project. In this example, we are entering the name “transient.” This selection opens the New Simulation dialog where we enter a name for the new simulation. Or we can select PSpice > New Simulation Profile from the main menu. To begin, we will select the New Simulation Profile icon from the PSpice toolbar. After you complete this demonstration you will be able to: This PSpice video demonstrates how to setup a PSpice simulation. If the word problem on the exam isn’t going to wreck you, then the trend-line analysis report using discrete data you need to hand into your boss 4 years later will.Solution home General PSpice PSpice Tutorial 5: Setting up a Simulation Profile It’s somewhat analogous to someone being an expert at using the “Power Rule” for calculating derivative homework questions, but doesn’t understand the concept of how a tangent line is defined as a secant line with a. If you don’t know the fundamentals, then it’s going to eventually trip you up. It goes over underlying concepts of SPICE, which in my opinion is required to become an effective SPICE user (regardless of the software you end up using). I hate being “that guy” who promotes his own video (the one linked above), but I seriously suggest checking it out (blame Carl for the bad scaling). Eventually things will get ironed out in time. KiCad/Eeschema interface for ngspice is still in its infancy, so just be aware that things can be a little quirky. ![]() It does this in inpcom.c with the void inp_fix_gnd_name(struct card *c) function. ![]() Ngspice simply auto-detects the “ GND” string and replaces it by “ 0” behind the scenes. I haven’t researched how exactly Ngspice handles the name of the reference node, since KiCad passes the name GND to it in the netlist, but I suspect it’s smart enough to detect an absence of a node called 0 and uses the node named GND instead. To do so it requires a reference node, which is called 0 in SPICE tradition. See this FAQ for details: ErrType(3): Pin connected to some others pins but no pin to drive it And you would never need a PWR_FLAG on the same net as GND, because GND is already a power output. You would stick a PWR_FLAG on the net with the IC VCC pin to tell ERC “no really, this pin is powered, trust me”. ![]() ERC will complain that the VCC pin is unpowered because there is no power output on the same net – it doesn’t know that you can power the IC through the fuse. Say you have a voltage regulator output pin (power output) connected through a fuse to the VCC pin on an IC (power input). Basically, one thing that ERC checks is that every pin marked as a “power input” has exactly one “power output” pin connected to the same net. The point of a PWR_FLAG is for ERC (electrical rules checking). I’m not sure this is your problem, but you don’t need a PWR_FLAG there. This is at least the reason for the warning, but maybe not the error. You can set these values in the spice model properties. You probably need to add a DC 1 (or whatever), or even make it a sine or some other type of source. What kind of analysis are you running? Your voltage source only has a value defined for AC (small signal) analysis: AC 1.
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