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From: | "=?UTF-8?B?Q3PDoW55aSBQw6Fs?= (csanyipal AT gmail DOT com) [via geda-help AT delorie DOT com]" <geda-help AT delorie DOT com> |
Date: | Mon, 10 Jun 2019 19:59:53 +0200 |
Message-ID: | <CAONhAouTSuT5hc4PcZXnPtsUndWY18H01KRPAyeVYUAVz3qq2w@mail.gmail.com> |
Subject: | [geda-help] ngspice - to simulate the simplest circuit |
To: | gEDA Help <geda-help AT delorie DOT com> |
Reply-To: | geda-help AT delorie DOT com |
Hi, I am trying to learn how to use ngspice. I have the simplest circuit in the DC_R.sch schematic file: v 20130925 2 C 40000 40000 0 0 0 title-B.sym C 43300 47300 1 0 0 resistor-2.sym { T 43700 47650 5 10 0 0 0 0 1 device=RESISTOR T 43500 47600 5 10 1 1 0 0 1 refdes=R1 T 43600 47100 5 10 1 1 0 0 1 value=220 } C 43700 45900 1 0 0 gnd-1.sym N 43000 46200 44200 46200 4 N 44200 46200 44200 47400 4 C 42700 46200 1 0 0 vdc-1.sym { T 43400 46850 5 10 1 1 0 0 1 refdes=V1 T 43400 47050 5 10 0 0 0 0 1 device=VOLTAGE_SOURCE T 43400 47250 5 10 0 0 0 0 1 footprint=none T 43400 46650 5 10 1 1 0 0 1 value=DC 6V } C 40800 48100 1 0 0 spice-directive-1.sym { T 40900 48400 5 10 0 1 0 0 1 device=directive T 40900 48500 5 10 1 1 0 0 1 refdes=A1 T 40900 48200 5 10 0 1 0 0 1 file=unknown T 40900 48200 5 10 1 1 0 0 1 value=.dc V1 6 6 1 } N 43000 47400 43300 47400 4 { T 43000 47500 5 10 1 1 0 0 1 netname=Vin } C 40800 47400 1 0 0 spice-directive-1.sym { T 40900 47700 5 10 0 1 0 0 1 device=directive T 40900 47800 5 10 1 1 0 0 1 refdes=A2 T 40900 47500 5 10 0 1 0 0 1 file=unknown T 40900 47500 5 10 1 1 0 0 1 value=.print v(Vin,0) } What I want is to get the voltage after R1, that is, to see how much R1 changes the input voltage of 5V in the circuit by using ngspice. I did run this command: gnetlist -g spice-sdb -o spice.net DC_R.sch In the spice.net I have these lines: * gnetlist -g spice-sdb -o spice.net DC_R.sch ********************************************************* * Spice file generated by gnetlist * * spice-sdb version 4.28.2007 by SDB -- * * provides advanced spice netlisting capability. * * Documentation at http://www.brorson.com/gEDA/SPICE/ * ********************************************************* *============== Begin SPICE netlist of main design ============ .print v(Vin,0) .dc V1 6 6 1 V1 Vin 0 DC 6V R1 Vin 0 220 .end then did run this command: ngspice -b spice.net but get this output: Circuit: * gnetlist -g spice-sdb -o spice.net dc_r.sch Warning: no nodes given: .print v(vin,0) Note: No ".plot", ".print", or ".fourier" lines; no simulations run What am I doing wrong? -- Best, Pali
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