gEDA-user: problem to simulate an astable multivibrator with uA741 opamp

I'm trying to simulate an astable multivibrator with ngspice, but the graphic i get is odd. I simulated the same circuit with qucs and ¡ didn't have any problem. I'm trying to figure out where the problem is. This is the netlist: *

Re: gEDA-user: problem to simulate an astable multivibrator with uA741 opamp

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

gEDA-user: error Ngspice: level not spicified on line...using level 1

Hi all I'm trying to simulate and plot basic graphics with transistor (in particular with the Q2N) but i always get the warning level not spicified on line ... Using level 1 My netlist file is *== Begin SPICE netlist of main design V1 1 0 DC 1V Q1 3 2 0 Q2N

Re: gEDA-user: error Ngspice: level not spicified on line...using level 1

in your model statement its going to assume your model is level one and use the level 1 bjt parameters to solve the circuit. On Mon, Apr 13, 2009 at 9:34 AM, joseda josedaniel_marti...@yahoo.es wrote: Hi all I'm trying to simulate and plot basic graphics with transistor (in particular

gEDA-user: ngspice: how to plot the transistor's characteristic curves

Hi, i'm trying to plot the transistor's characteristic curves but i can't. I can only plot one curve (for a specific base current). I would like to plot in a unique graph for several base currents. This is my netlist (with a current source in the base of the transistor and a voltage source of 0

Re: gEDA-user: Ngspice help

color. Why? How can i change this? I'm using Fedora as OS! You can launch ngspice with some plots, but not in batch mode. Graphic window and batch mode is contrary. Which plots? asciiplots? Regards joseda -- View this message in context: http://www.nabble.com/Ngspice-help-tp22507382p22512019

Re: gEDA-user: Ngspice help

You can add them to the spinit file. On my box it's located in /usr/share/ng-spice-rework/scripts/spinit It's worked. Thanks. Now is nicer!! No. graphical plots. (example attached) Thanks again. It's worked. The point was to add the directives .control and .endc. Regards -- View this

gEDA-user: Ngspice help

Hi everyone!! 2 question about ngspice. 1) Can I set the background color of the graphic window as white (and not black) by default? 2) Can I launch the graphic window in batch mode?(I'm trying again and again but unluckily all i got is segmentation faults) Thanks in advance! -- View this

gEDA-user: How to plot in batch mode (ngspice)

Hello, I've discovered gEDA and ngspice and it's fantastic although there is a big road to do. I'm making a work in my university about EDA tools in Linux. My question: Is there a way to plot a graphic (with a .plot directive in the netlist file) after run a simulation in batch mode? Thanks in