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On Wed, Feb 10, 2021 at 02:12 PM, SB-LAB di Bianchini Stefano wrote:

it is not a matter of annoyance in seeing the message, but I would like to be sure that the valve does not blow.

OK, I understand now. You can amend the PIV on the rectifier to suit this need. The help file gives some guidance on making up your own rectifiers and modifying the existing ones.

Help > Contents > Technical information > How to add your own rectifier types

You might want to take the gz37.rect file and copy to something like gz37ind.rect to make an inductive version with higher PIV. Notepad can be used to open and change the file. As well as changing the <vpiv> value you will need to change the <name> value also, as it will not want to load the same name twice, so the contents of the file should end up looking like:

Regards,
Duncan

On 2/10/2021 4:44 PM, SB-LAB di Bianchini Stefano wrote:

be sure that the valve does not blow.

If your VAC is under 654V AC for inductive input, and your input choke is reasonably large (Google "critical choke value"), then the PIV will be under 1850V. (565V AC for the 1600V condition and rating.)

These values give 588V or 790V of DC, which for most purposes is "a lot!". Some radio transmitters run higher, most audio much lower. (Yes, I have worked in a 590V Ampeg amplifier, and I lived.)

PSUD is very very wonderful but not perfect. If you force it into unhappy conditions it sometimes gives wrong answers. I knew that 442VAC would not normally cause more than 1250PIV. However when PSUD is given a too-small choke value, when the current passes through zero the choke "kicks". How much does it kick? PSUD can not know, we have not told it the shunt resistance and capacitance of the choke. So PSUD gets a "divide by Zero" error and throws out some large numbers. Like 2206V! And lotes of very narrow "static" spikes. An under-sized choke is *bad*, but does not look like this.

I was not able to get an extreme PIV when I checked the Choke Current to see that it never got close to zero, the test for "critical inductance".

-Paul

it is not a matter of annoyance in seeing the message, but I would like to be sure that the valve does not blow.

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It could certainly be changed, the issue is that it doesn't have an ability to have two different PIV in the model. The PIV parameter doesn't actually do anything other than to issue a warning to tell you that the number has been exceeded. If the warning is a nuisance, it can be turned off with the Options > Allow Warnings menu item.

Regards,
Duncan

On 1/20/2021 9:45 AM, Duncan Munro wrote:

You should be able to download from the following page -> some out of date code which used to work but website has just been updated. Could you please try again?

Works now. FireFox 84.0.2 on Windows 7.

Thanks a lot Duncan.
It works as it should.
What can I say.
Great job with psud2 and tdsl pe.
Happy for more than 13 years now.
And the last PSUD2 version 2.22 build 76 is nicely improved with graphical display on my screen.
Keep it like this.
I am a linux om , but both apps work greatly under wine (Linux Mint 20 with Cinnamon)!


73 de Konstantinos, SV1ONW

Hi Konstantinos,

The code for example PSU files has now been amended, tested, and the website has just been updated. Could you please try again?

73,
Duncan
M0KGK

Hi Duncan,

This is the location I am trying to download from.
I cannot access the link.
Would it be difficult to put the guitar amp designs in a zip file here?
Thanks a lot again
73 de Konstantinos
SV1ONW

Just checked the website over and it uses some out of date code which used to work but has now been blocked from operating. It will need some minor rewriting which I will do this evening and post back when done.

Thanks for letting me know about the issue.

73,
Duncan
M0KGK

Hi Konstantinos,

You should be able to download from the following page ->?

Are you getting an error message, or having difficulty accessing the page?

73,
Duncan
M0KGK

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

To be honest, you will struggle with this on PSUD.

It splits into four series/parallel filters which PSUD can't model and there's no future plans to add this functionality as it's way outside of the design brief. Personally, if I was doing this, I'd head straight to LTSpice which would do a great job of modelling this supply.

There's some advice on using LTSpice with valves/tubes here ->?

It shows a triode but the principle is the same if you want to make up a rectifier, just less pins. You'll find SPICE models for the 5U4 rectifier here ->?

Hope this is some help to you.

Regards,
Duncan

:) That is SO much better, thanks for the quick turnaround.

I have a basic PSU design for my tube amp that I am trying to simulate, however since I have multiple B+ rails I am struggling to add multiple (different) load resistors in the right spots so I can get my main B+ rail to work out but the secondary B+ rail is way off from my expectations probably due to the missing load resistor (I can only add one in this app). ?Any pointers? ?I am trying to measure Bpl and Bsl in my diagram below.

A revised Mac version has been released to address a user interface performance issue when operating Dark mode. This should now operate correctly, along with better handling of changes in theme.

It can be downloaded from the files area ->?/g/duncanampspsud/files/psud2_macos

Thanks to Waldo for highlighting the issue.

Regards,
Duncan

Hi Waldo,

Let me have a look at this. The UI components are revised on this version, I'll check if there's a "hover delay" been added in and if so I can do something with it.

Regards,
Duncan

Hi,

It seems like the UI of build 75 is much slower and more laggy on macOS 11 than build 73. ?I upgraded to 75 to get dark mode support but moving the mouse over the different filter sections is laggy by about 400ms or so. ?I am on a very fast Mac Pro 2019.

Waldo