On Wed, 12 Oct 2011 16:44:41 -0500, "Dave" wrote:

Hey John. No, I don't have any data on the PV (I'm guessing that is
"PhotoVoataic".) It's something I pulled out of my junkbox...

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PhotoVoltaic. :-)
^
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BTW, I'm trying to run this sim in LTSpice, and can't figure out how to make
it work. This is a netlist, right?

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No.

It's an ASCII circuit description, and LTspice generates the needed
netlist from it.
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How can I import it to my version of LTSpice and give it a test run.
I'm really interested in seeing your changes.
Thanks!

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OK.

Save the list to a file and name it anything you like as long as it
has a .asc extension, say, "nightlight.asc".

Then, invoke LTspice, navigate to the file and left click on it.

Voila! The beautemous schematic will appear before your very eyes,
ready to be run and probed :-)

BTW, the X axis of the waveform viewer is set to correspond to a 24
hour day and you can adjust the voltage divider connected to the BJT's
base to set the circuit's switching threshold to a function of time by
regarding voltage as a function of irradiance.
--
JF