[sdiy] SPICE (was Re: Synthex Oscillator)

[matt holland]

"Delorean slaptop with a 2.1 GigaMutz Dumbtel CoreBlimey Eye7"

best of sdiy

On Wed, Jul 12, 2017 at 6:07 PM, Neil Johnson <neil.johnson71 at gmail.com>
wrote:

> Hi Bob,
>
> > Couple of things:
> >
> > First, would it be possible to share the 74hc library? My Yahoo account
> has expired, or at least it isn't accepting my password for some reason.
> >
> >
> > I did find another 74hc.lib file, but when I use it I do not see any
> SPICE symbols when loading your file. I don't know whether the problem is
> that this library is missing some parts that the Yahoo library contains, or
> if it's more of a setup issue on my part.
> >
> > https://www.classe.cornell.edu/~ib38/teaching/p360/
> lectures/wk12/l35/11.1/74hc.lib
> >
> >
> > Second, can anyone help get this loading on Mac OS X? I've used SPICE
> for decades, but it's always such a hassle to deal with libraries, symbols,
> and all of the manual configurations. I found a YouTube video online, but
> it's 20 minutes long and involves a great deal of manual editing of the
> SPICE files just to get different libraries working in LTspice.
> >
> > If anyone knows a "standard" way of adding a third-party library to
> LTspice such that I can load Neil's unaltered file, that would really help.
> I assume that generic instructions might be useful for other members of the
> Synth DIY list.
> >
> >
> > Finally, I did seem to get the simulation to run in LTspice after I
> manually edited the SPICE directive to point to the full path of the
> 74hc.lib file that I installed, but the output waveform on the sawtooth
> capacitor was a steady +5V. The pulse input to the counter was so dense
> that it slows down the whole user interface as it draw 5 seconds of clock
> waveform. Maybe my 2.3 GHz laptop isn't fast enough?
>
> Ah I guess you'll be needing the symbol libraries as well.  The LIB
> file goes into
>    \lib\sub
> and the symbols go into
>    \lib\sym\Digital\74HC
>
> I am in the US this week on business and won't be back until the
> weekend, so I'm (a) jetlagged, and (b) my install file archive is on
> my lab machine at home.
>
> For reference, I am running LTSpice on a Delorean slaptop with a 2.1
> GigaMutz Dumbtel CoreBlimey Eye7 and it simulated reasonably ok for
> me.
>
> Neil
> --
> http://www.njohnson.co.uk
>
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