I really need you help. I've bought a book with a Multisim 10.1 Student Edition.
When I want to simulate something, I receive the following error message:
"This circuit has no power sources: unable to determine the simulation timestep automatically.
Please add a power source or set the simulation timestep under "Interactive Simulation Settings" to proceed."
I am using Windows XP.
Some time before I downloaded Evaluation Version from NI website and had the same problem.
Thank you for your help.
seems that you have forgotten Power Source like VCC, VSS or AC/DC Source or forgotten the Ground (Analog/Digital Ground)
Attached here an example in *.doc. Please attache here your *.ms10 circuit if problem still exists
Just as Johann explains, you need to set a VCC and GND on your schematic so the digital components can work correctly, here's a link to a document that has a more detailed explanation on why you need them and how to connect them.
Hope the information is useful.