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Thanks for the quick reply Duncan. No problem. I just wanted to make sure I wasn’t missing something. It’s a great tool - thank you ?? John

Just a word of thanks, Duncan for making such a useful piece of software available gratis. I've used it as necessary for many years; it beats faffing around finding suitable models for Spice, and for

Hi John, This is a PSUD2 problem rather than a mismatch in setups. Kirchoffs first law is quite clear, the currents going into a node should equal the currents coming out. To speed up and simplify

Hi. I've been poking around trying to explain a 10volt difference between PSUD2 and LTSpice results for an EZ81 based power supply. It's not a big deal (the amp's been working for years) - I'm just

I would say that the 1mA or so of current through the balancing resistors is insignificant. You could use a 100uF 500v capacitor instead, but it would probably cost more than the two 250v ones. The

Hi Paul, I believe you asked about the voltage divider resistors in parallel with the series resistors. While it is a small current going through them it still presents a load on the supply. I would

Hi Paul, Yes, just use half the value for the capacitor and you'll have the right answer. Any ESR (Equivalent Series Resistance) in the cap should be doubled. Regards, Duncan

Hi, apologies if this has been asked before, to model capacitors in series I assume you model one capacitor at half the value. For example two 220uF caps in series would be modelled as one 110uf Cap.

Only if your VIC-20 runs Windows 7/8/10/11 in 64 bit... :) Regards, Duncan

I'm still using a VIC-20. Is it compatible?

Hi Marc, have added you to the list. Regards, Duncan

On the other end of the scale is myself. I’ve toyed with the program a bit but I’m a “nube” to electronics. I’m in the middle of building a couple of tube projects that will need new power

" I was holding back to be sure every eager body had a chance" Hi Paul, you've been a MASSIVE contributor to this group in terms of technical input to me as the designer, and in assistance/advice to

Hi, just wanted to say, very happy to see this development and how close it looks to be getting. I'm not savvy enough to beta, but am excited about the potential to my toolbox. Since 1985 I've beta

I was holding back to be sure every eager body had a chance. But yes I would like to see, comment, and suggest. I have much experience in beta-busting. I have done power supplies with ARRL Handbook

Designing a couple supplies atm and love to try version 3! Best Regards. Mark Nelson

Hi Duncan, yes! I'm interested in this! I constantly use PSUD2 so I can compare with the new one and let you know. Best regards, Fabio

Count me in. I was a programmer for over 40 years and electronic engineer... if that's worth anything. On the flip side, I' out of town for 10 days starting today - Ian

Hi all, I'm still working on PSUD3 but thought I would pass it out in Beta form for comment to a small number of participants to get feedback on any potential major flaws. I'd like to keep the initial

Good tip. The files ended up here due to a restriction on hosting certain files on duncanamps.com when the hosting moved provider about 3 years ago.? I think I've got round this now so should be able