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[Reason: which do not exist]

Since foolishly embarking on the now long-deleted (Walton) published SE design (I was and am on a very restricted budget...) over a decade ago only to find some of the major (i.e. very expensive!) components (Plitron chokes) were no longer available, I turned to the internet for help to redesign and found, among really very few other resources... PSUD2.? Hey! I thought with this help I would possibly ditch the valve rectifier and go with silicon. But that was then...

I have never really been able to get to grips with PSUD2 (I have build 77) and having an intel MacBook didn't help either until some kind soul showed me how to insert filter sections.? Yeah basic stuff - as others have sagely observed: when you don't know - you don't know.? What to look out for has always been the issue: e.g. just what influence do those asymmetic chopped off sinusoidal 100mS current traces in C1 really have?? Can I (should I?) get rid of them?? So, I sequentially change C1 or C2... Cn or L1... Ln - and observe whether that makes a 'good' diffierence and then I look at what happens out to 10,000mS after a reporting delay of x ~ but what does all that mean?? The variables are dynamic and there seems no way of knowing what is good enough.

I now find I can not use PSUD to model the silicon diodes I had intended (Hexfreds as it happens) ~ since the rectifier list does indeed appear MIA and groups host shows no such thing as a database... therefore I could not find the recent information on the recently group post concerning another contibutor's Hexfreds anywhere. ? As a former Chemist a mathematical method for enumerating Vfac and Vlaw such as simultaneous logarithmic equations has not been the issue for me. - no, what I am struggling to say is really how to use PSUD.? A cursory glance at more modern PSU schema (such as by Dipl. Ing. Jac van de Walle () and using serially connected choke for improved common mode rejection - shows a plethera of different approaches but I have not attempted to model these on PSUD.

Please do not "get me wrong,"? PSUD is clearly a very GREAT project one which has clearly taken a great deal of time and specialist expertise - I only wish there was as great a guide to its use.