That was the trick! I fixed by adding a new voltage source of -15V (i called Vee)
But why is not -Vcc the same as Vcc multiplied by -1? Vcc is 15V so -Vcc should be -15 V but it doesn't work this way!! Anyway, thanks! 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] -- View this message in context: http://www.nabble.com/problem-to-simulate-an-astable-multivibrator-with-uA741-opamp-tp23057811p23060560.html Sent from the gEDA - User mailing list archive at Nabble.com. _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
