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Date: Thu, 15 Nov 2012 19:12:30 -0800
Subject: Re: [geda-help] New user help with gEDA-  gschem, ngspice, and
 opamps
From: keitho AT strucktower DOT com
To: geda-help AT delorie DOT com
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>
> On Nov 15, 2012, at 2:29 PM, keitho AT strucktower DOT com wrote:
>
>> I see that gnetlist has designated my opamp with a "U" instead of an
>> "X",
>> not sure what that suggests.
>
> That's why it doesn't work. You need to start the refdes of a device
> modeled by a subcircuit with "X".
>

Hi John-

Thanks for responding.

I went back into gschem and edited the refdes to now read "X8" instead of
"U8".

But now I get this error:

********
Circuit: * gnetlist -g spice-sdb --nomunge -i -o test1.net test1.sch

Original line no.: 0, new internal line no.: 114:
Undefined number [B__1]
Original line no.: 0, new internal line no.: 114:
 Expression err: b__1)
Original line no.: 0, new internal line no.: 114:
Cannot compute substitute
Original line no.: 0, new internal line no.: 115:
Undefined number [B__1]
Original line no.: 0, new internal line no.: 115:
 Expression err: b__1)
Original line no.: 0, new internal line no.: 115:
Cannot compute substitute
 Copies=124 Evals=75 Placeholders=4 Symbols=5 Errors=6
Numparam expansion errors: Run Spice anyway? y/n ?
n

ERROR: fatal error in ngspice, exit(1)
keith AT t520:~/gaf$

*****

Is this due to an error in the subckt? Or something about the way I have
configured it?

I wonder- there is one line in the TI datasheet which I wasn't sure how to
interpret. It looks like a line which was wrapped around but not
designated as a continuation.

Here's the subckt from the datasheet:

http://www.strucktower.com/tlv274in_Page16.jpg

I've marked what I interpret as one line in my tlv27x.inc.

The only other thing I can think of is... someone (and the manual)
mentioned I would need to have the "--enable-xspice" function compiled in
order to use these older models which use the "poly" statement. Since I
got this from the Debian repository I don't know if that was done or not.

Ideas?

Thanks so much,
Keith