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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>
Content-Type: text/plain; charset="UTF-8"
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