On Apr 15, 2009, at 6:47 AM, joseda wrote: > > I'm trying to simulate an astable multivibrator with ngspice, but > the graphic > i get is odd.
... > XU1 1 2 Vcc -Vcc 3 uA741 > ... > The voltage drop below 400V what's the problem?!! > You have a node named "-Vcc". You haven't attached this node to anything outside the opamp. Presumably you intended to attach a negative power supply. The opamp model contains a current source attached to this node, so letting it float makes rather high voltages. John Doty Noqsi Aerospace, Ltd. http://www.noqsi.com/ [email protected] _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
