Ok Todd, I get it. I need to be careful of delayed referencing.

I am in my 70s now, but this is a model of an amateur radio power supply I built from an article in a Amateur radio magazine back in 1957. It had 2 866a Mercury vapor rectifier tubes. I got rather severely shocked, when as I was measuring the output voltage with a vacuum tube voltmeter. I was pulling the grounded aluminum chassis closer to me with my left hand, while holding the voltmeter probe tip on the supply output with my right hand. Unknown to me, the set screw holding the coaxial cable in to the probe tube had been screwed down too tight, and was in contact with the coax center conductor going to the probe tip.. My left hand was on ground, and my right was gripping the probe and the set screw. I woke up across the room, on the other side of the bed. My back muscles hurt for about 8 months. They were part of the current flow. Always use only 1 hand when working with high voltage. So I became an Electrical Engineer. This model seems to work on low semiconductor voltages also. The filter capacitors are much larger, and a bleeder resistor is not needed.

Kent

Hi Kent, another EE here... Always glad to see more Mathematica users! I have not parsed your code fully yet, but I did quickly notice that you have an odd, or non-standard, mixing of "=" and ":=".

At least to begin, a simple rule, not hard and fast, but pretty much applies in most cases:

":=" is used when defining a function, and not for much else.

Its precise meaning is that the expression with ":=" is not evaluated until it is referenced, whereas "=" evaluates immediately. I've had some weird things happen when I use ":=" similar to the way you have.

From what I can tell, you can go through your code and replace all the ":=" with "=" as a quick test, and see if that makes a difference in your answer.

Regards, --Todd