From the eagle control panel, double click onto the "tran" schematic symbol. The schematic editor will rise, containing this schematic:
Again you will see the upper green textline which tells spice3 to perform an TRAN (time-domain) analysis. The arguments of the .TRAN command are assigned to steptime stoptime starttime of the simulation run.
The lower green textline is not a spice3 command , but is filtered by
the spice3.ulp program. It provides a workaround for the ugly fact that
eagle can handle only rather short (15 chars) value strings. After stripping
the name of the source, it appends the rest after the existing value of
the source. In the case above, the resulting value that spice3 will get
is "10V PULSE 0V 1V 0ms 1ms 1ms 49ms 100ms". This tells spice that
it should make this voltage source a rectangular 1V pulse. The arguments
of the PULSE command are: initialvalue pulsedvalue
starttime risetime falltime pulsewidth period.
Press F12 to see the results.
Feel free to experiment with the circuit.
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