[sdiy] SPICE (was Re: Synthex Oscillator)

[Neil Johnson]

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