Search found 43 matches

by duncanamps
Wed Jun 17, 2026 7:26 pm
Forum: PSUD3
Topic: PSUD3
Replies: 8
Views: 37934

Re: PSUD3

Is there any interest in creating a web based version of PSUD2/3? I'm also a software developer and would love to get involved.

I did look at this, but PSUD is the most math-intensive piece of software I've ever written and it wouldn't take many users to put a heavy load on a web/cloud server. I ...
by duncanamps
Wed Jun 10, 2026 5:14 pm
Forum: PSU Design
Topic: Understanding safe start up behaviour.
Replies: 3
Views: 6780

Re: Understanding safe start up behaviour.

Do I understand correctly that the higher ripple pre choke is cancelled in a PP output?

This is generally correct, the Push Pull stage tends to reject power supply ripple along with even order harmonics.

However, you can get the supply rails modulating the output (IMD - Inter Modulation ...
by duncanamps
Tue Jun 09, 2026 7:50 pm
Forum: PSU Design
Topic: Understanding safe start up behaviour.
Replies: 3
Views: 6780

Re: Understanding safe start up behaviour.

Hi, and welcome.

I wouldn't worry too much about the current spike, especially for SS rectifiers. The initial design that PSUD2 opens up with is modelled on the power supply from my 4 x 6L6 / 4 x EL34 guitar amp. It hits peaks of around 9 amps from memory. It's only for a few cycles so doesn't get ...
by duncanamps
Sun Jun 07, 2026 7:59 am
Forum: PSUD3
Topic: PSUD3
Replies: 8
Views: 37934

Re: PSUD3

Hi Joe,

Some of my projects are closed source and some are open source (you can see those at https://github.com/duncanamps ).

Much depends on the target audience, typically the open source ones are aimed at programmers; people with known technical skill who will be able to understand and use the ...
by duncanamps
Fri May 29, 2026 8:24 pm
Forum: Amplifier Design
Topic: Blues Deluxe Reissue gain mods
Replies: 1
Views: 5953

Re: Blues Deluxe Reissue gain mods

Hi Ross,

Glad it was some use to you, however I cannot claim any credit for it! The mod was developed by Andy Marshman, he's the guru behind the change :D

https://www.duncanamps.com/technical/bluesdeluxe.html

Regards,
Duncan
by duncanamps
Fri May 29, 2026 8:21 pm
Forum: ML7Gear
Topic: An abnormal lathe.
Replies: 1
Views: 5949

Re: An abnormal lathe.

Hi,

The software is not set up to work with the Chinese mini lathe without setting up a new profile. You can do this yourself, but it is quite complicated.

However, if you go to the download page, at the bottom of the page there is a simpler piece of software that works with only 4 gears. This may ...
by duncanamps
Sat Dec 27, 2025 3:13 pm
Forum: News
Topic: ML7Gear build 46 released
Replies: 0
Views: 14478

ML7Gear build 46 released

Hi,

A bug fix released of ML7Gear is available, read the notice here -> https://forum.duncanamps.com/viewtopic.php?t=51

Regards,
Duncan
by duncanamps
Sat Dec 27, 2025 3:12 pm
Forum: ML7Gear
Topic: ML7Gear V1.2 build 46 released
Replies: 1
Views: 7467

ML7Gear V1.2 build 46 released

Hi,

A bug found in build 45 has been isolated and fixed. When changing the number of gears on hand with Ctrl+G, the software would not save the file after the changes. This has now been fixed and the application re-packaged.

Please download a fresh copy from: https://metal.duncanamps.com/software ...
by duncanamps
Wed Dec 03, 2025 1:19 pm
Forum: News
Topic: Site had been down 2-3 Dec
Replies: 0
Views: 9621

Site had been down 2-3 Dec

Hi folks, the site had been down for many hours across 2nd / 3rd December due to an upgrade issue, however this has now been solved. Thank you for your patience.

Regards,
Duncan
by duncanamps
Wed Nov 12, 2025 6:22 pm
Forum: SPICE
Topic: Help modeling triode with heater
Replies: 2
Views: 12312

Re: Help modeling triode with heater

Hi,

However, there was no link to the generic triode model...

I withdrew the Generic Triode model as it had some real accuracy issues. Not sure if I would re-visit it, as there are probably a lot better models out there since I put the model together 28 years ago.

However, the documents are ...