Which voltage source to use in PSpice?
As far as I know, you have to attach a ground connection to the back of the voltage source. PSpice hates it when you leave floating connections. If you just attach a ground to the back of whatever voltage source you want it will simulate it just the same as if it was just a voltage source at the top. I'm assuming you are using DC, so type in VDC in part search to get the generic DC voltage source.