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Mail Archives: geda-user/2016/09/20/14:00:44

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Date: Tue, 20 Sep 2016 18:59:05 +0100
From: "M. J. Everitt (m DOT j DOT everitt AT iee DOT org) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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To: geda-user AT delorie DOT com
Subject: Re: [geda-user] pin number and pin sequence of diodes
References: <20160919070050 DOT 2524 DOT qmail AT rahul DOT net>
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On 19/09/16 08:00, John Conover wrote:
> Unless I am mistaken, the PINSEQ is reversed in many of the library
> diodes.
>
> Spice requires the anode node followed by the cathode node, as
> determined by the PINSEQs, (these, I think, are reversed in many of
> the diodes in the library.)
>
> Pcb routes on the pin number, (which are correct in most of the diodes
> in the library.)
>
> So, if I want a spice simulation of a diode, PINSEQ=3D1 would be the
> anode, and PINSEQ=3D2 would be the cathode. I think this is the way
> gnetlist -g spice-sdb works.
>
> If I want to layout the diode circuit, PINNUMBER=3D1 would be the
> cathode, and PINNUMBER=3D2 would be the anode, (and the PINLABEL would
> be K and A, respectively.) I think this is the way gsch2pcb works.
>
> Am I right?
>
>     Thanks,
>
>     John
>
Yeah I've been frequently bitten by this one .. no substitute for check,
check and check again I'm afraid! :]

MJE


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