PSU II Question - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 11th April 2013, 12:09 AM   #1
alecu7 is offline alecu7  Canada
diyAudio Member
Join Date: Mar 2010
Location: Hamilton
Default PSU II Question

I'm a little puzzled about some of the results from PSU program.
For I1 I have 100mA stepped to 170mA (after 3 seconds). In the same way I have I2 4mA stepped into 8mA after 4 seconds.
When I ran the results after 20 seconds I see I1 = 100mA and I2 = 8mA. I don't think I1 should be 100mA but 170mA (especially after 20 seconds). To me the final currents should be 170mA and 8mA.
The current through the choke is 178mA (which is correct).

Am I doing something wrong here?

Second picture shows the transient time at the beginning of the simulation.

Thank you,
Attached Images
File Type: jpg Psu 1.jpg (184.0 KB, 181 views)
File Type: jpg Psu 2.jpg (200.6 KB, 171 views)
  Reply With Quote
Old 11th April 2013, 11:03 PM   #2
alecu7 is offline alecu7  Canada
diyAudio Member
Join Date: Mar 2010
Location: Hamilton
I'm wondering if anybody got an explanation for this issue!
  Reply With Quote
Old 12th April 2013, 01:42 AM   #3
jjman is offline jjman  United States
diyAudio Member
Join Date: Jan 2009
I ran your numbers and see the same thing. The voltage drops on c2 and I1 as it should at 20 seconds. Moving the step forward or back does not resolve it. Looks to be a bug. I have ver 2.0.2.
  Reply With Quote
Old 12th April 2013, 02:30 AM   #4
alecu7 is offline alecu7  Canada
diyAudio Member
Join Date: Mar 2010
Location: Hamilton
Thank you for confirming it. I have run hundred of simulations and I always get the same result. At least I'm not crazy.
  Reply With Quote
Old 12th April 2013, 07:59 PM   #5
diyAudio Member
Join Date: May 2005
Location: Stittsville, Ontario, Canada
Default PSUDII and Current taps

I tried out this simulation and got the same results as everyone else ( no surprise there)
I fooled around a bit with adding more current taps and changing the timing etc and it looks like the only current tap that gets the correct current to plot is the one used as the final load. Any other position it behaves as L1 does in the original post. The simulations seem to be correct ie they draw the second requested current, just reporting the first one the plot.

I don't see a place to provide feed back on the DuncanAmps web page, or anything in the PSUDII help file, otherwise I would report this as a bug.
Robert McLean
  Reply With Quote
Old 13th April 2013, 12:13 PM   #6
alecu7 is offline alecu7  Canada
diyAudio Member
Join Date: Mar 2010
Location: Hamilton
I'm also using version 2.0.2 built 41.
I have emailed Duncan about the issues we are having and we just have to wait for an answer now.

Thank you all for confirming the bug. It is nevertheless one of my favorite programs that I'm using.

  Reply With Quote
Old 13th April 2013, 03:17 PM   #7
diyAudio Member
Join Date: Apr 2013
Hi all, it sounds like something in PSUD2 that should have been implemented and wasn't.

Don't have time to look at it this weekend because of family commitments but I will have a look on Monday night.

  Reply With Quote
Old 13th April 2013, 09:15 PM   #8
diyAudio Member
Soonerorlater's Avatar
Join Date: Jul 2008
Location: Belfast
Welcome to the forum Duncan, great freebee
When white moths were on the wing,
moth-like stars were flickering out,
  Reply With Quote
Old 14th April 2013, 01:22 AM   #9
surfstu is offline surfstu  United Kingdom
diyAudio Member
Join Date: Nov 2008
Location: London
Yes, thankyou Duncan, I aprreciated using this bit of software too!!
  Reply With Quote
Old 14th April 2013, 02:16 PM   #10
diyAudio Member
boywonder's Avatar
Join Date: Jan 2008
Location: So.Cal.
Thanks Duncan! I find PSUDII to be incredibly useful as well.
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
FS Buff II DAC + Placid PSU + IVY III + Placid BP PSU - $350 ianp Swap Meet 1 23rd March 2013 02:38 AM
PSU id and help (psu designer ii) surfstu Tubes / Valves 13 28th January 2013 07:18 PM
PSU Designer II question ccschua Tubes / Valves 2 20th June 2009 03:40 PM
Quick question regarding PSU Designer II w00t Tubes / Valves 5 28th October 2004 11:38 AM
Need some help with PSU Designer II Bricolo Parts 12 14th November 2002 06:42 PM

New To Site? Need Help?

All times are GMT. The time now is 12:19 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2