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Re: [Help-gnucap] Open node in transistor circuit

From: al davis
Subject: Re: [Help-gnucap] Open node in transistor circuit
Date: Wed, 11 Oct 2006 03:03:41 -0400
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On Thursday 28 September 2006 12:45, Rubén Gómez Antolí wrote:
> I'm simulating a circuit with a transistor. When I change the
> value of power supply I get a "open circuit:internal node".
> The circuit runs well on ngspice, I don't know about what I
> doing bad.

It works for me.

That "open circuit" message isn't always a problem.  It means 
there was a matrix singularity, which could be during iteration 
and not a final result.

"open circuit" means that there is a high impedance at a node, 
so high that it is impossible to calculate a voltage.  For 
example, think of two capacitors in series.  What is the DC 
voltage at the junction?  it's unknown!

I don't see anything like that for your circuit, but when not 
converged anything can happen.

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