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I've been using this brilliant piece of software for years but I think there's a missing function that could be useful to many diyers. I'm referring to hybrid bridges. Now I'm working at a little 2A3 amplifier and the idea is to use two silicon carbide diodes to ground and a 5Z3 on the positive leg. This solution has several practical advantages and works great. Would it be possible to add it? Many thanks.

I haven't used this for a while and now find that I cannot open any of my saved .psu files. Looks like some permissions issue. Any suggestions? Thanks, 73 Jack KZ5A

Attached DHTRob manual/guide, could I trust him? or do you have a better tutorial/guide to use PDUII? TIA Felipe

Hello Duncan. I installed the latest version on my new laptop and tried to download some of the examples from the download section of your site in the psud2 area, but I did not managed to do so. Could you please check the link or point where these .psu examples can be downloaded from? Perhaps from here? Thanks in advance, Konstantinos, SV1ONW

Hi, I have a new Mac after years of PC only, and when I download the Mac version from the website I get a message saying: “psud2_build73” cannot be opened because the developer cannot be verified. macOS cannot verify that this app is free from malware." I looked back in the group and it seems like folks are not having this issue. Any suggestions? Thanks, Pete

Duncan, Thank you for the free software. I have used it for many years and appreciate the work that you have done. To Mac Users, I am running PSUD II version 2.2 Build 73 on my MacBookPro. When installing you have to allow an installation from outside the Apple store. I developed commercial applications for Android, Apple, Apple iOS and Windows computers. PSUD II is specifically written for the Windows OSes and requires the Win32 library (only available on a Mac running a windows virtual machine or emulator). The $99 cost for using the apple store is most likely not the issue. He would have to translate the program to a code language that is compatible with the Apple OS. This is not a trivial exercise and could take months to do. I know this because I have translated some of my windows programs to both Android and the Apple iOS. Programs that I use personally and do not want to waste time converting I run on my Mac using a Windows OS virtual machine. Best regards, Steve On 5/8/2022 10:39 AM, Ian Eales via groups.io wrote: perhaps the mac users could take up a collection... ? - Ian On 5/8/2022 09:29, summers_folium_0k via groups.io wrote: I think it is 99 USD / year https://developer.apple.com/support/compare-memberships/ Regards Rob Am 08.05.2022 um 18:04 schrieb Chris <acheld_at_gmail_com_9bd68tgjww7574_16dadbc6@...>: ? The workaround for MacOS is very straightforward. After trying to open PSUD for the first time, go to System Preferences>Security and Privacy>General tab. You will then have to "unlock" the pane by clicking the lock at the left lower corner and entering your password. I don't recall the exact sequence, but you should be able to then allow MacOS to run PSUD. Out of curiosity, what would it cost to be an "identified developer"? On Sun, May 8, 2022 at 7:02 AM Duncan Munro <duncan@...> wrote: It's not an Apple exclusive I'm afraid; Windows 10 & 11 are displaying similar warnings if the software isn't registered with them, arguably easier to work round though. Regards, Duncan

Hello John, The damnedest thing ~ I tried it again and EUREKA ~ PSUD2 does indeed insert filters on a MacBook. I had no idea of the existence of that pop-up. My MacBook was bought 'refurbished' and I have some issues with it (e.g. Maps are blank every other day) so perhaps it's a case of a worker blaming her tools... I've only been using Macs since the early 1990s (and amateur programming, in Fortran and Basic, long before that ~ never something called machine code or ugghh MS DOS though ~ so I was certainly not up to speed with two-fingered tapping and I believe I'm correct in asserting that there is nothing in the (IMHO rather sparse) PSUD2 'documentation' about having to do the two-fingered shuffle to insert filters - on any operating system.) For that previously missing piece of information I have to thank you very much. I can now play the theoretical game 'do not blow up the rectifier' to my heart's content. However, this has thrown up another nasty for this naive Mac user... .PSU files ~ I can save them but cannot view them. Acrobat Reader immediately throws in the towel (corrupt attachment / not supported type blah;) whilst I could use screenshot to save them it's yet another mystery. Finally, when I do the calculations for the HEXFREDs I propose to use, I might be in position to start building an amplifier. I've only been collecting expensive parts for a decade or more. Once again, John, please allow me to say that your advice has been priceless. Siobhan Sent with ProtonMail secure email.

Hi, Downloaded the Windows version from the Files page but all I seem to be able to access is the Help area. What am I doing wrong? Thanks, James.

Hello Thanks to the help received from people (as an ex chemist I have some experience but zero training in electronics) I have been able to resolve a number of very basic MacBook-related PSUD2 issues - the double tap on the track pad still initiates annoyance though and hopefully there may be a way to remove the need in PSUD3? As to PSU design... it's now a relatively easy task for me to "lay out a design" with nanovolts of variation at say 10 seconds after 9 second reporting delay ~ but in truth I find I have scant real innerstanding of what that really means. Moreover those nanovolts are achieved with what I assume are huge amounts of inductance (20/40H) and large, expensive and normally non-stocked link capacitors of the sort that, if they are available, necessitate buying boxes of them from the US of A. However, when I try to model published PSU designs (e.g. Jac van de Walle/JAC Music, Menno van der Veen, Claus Byrith etc) not only do they achieve their results using, in comparison to my efforts, fewer, simpler arrangements in effect more elegant, "rational" and "economical." If that were not enough I would appreciate a steer on whether incorporating Llundahl - type double winding chokes ~ is anything "mystical." Yep there is much to learn. Thanks for the forum's continued understanding and guidance. Is a rational guide possible if not AI optimisation?!