Xamp-simulations problem_s - Page 3 - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

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
Reply
 
Thread Tools Search this Thread
Old 30th July 2003, 05:20 PM   #21
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
Mind you, I have nothing against SPICE per se, and you're
right - it's more addictive than Doom.

I use MicroCap - the old DOS only version, and I only use it
to design filters and passive networks. In this sort of application
I have never had any problems. Before that I used the HP
version of CAP (I have the source code, ha ha) which I liked
even better.

Truth be told, I have never simulated an Aleph or an X or a
Zen, and I couldn't tell you how well the models stack up to
the real thing, but I do know that gain devices do not always
match up well enough to the models to reliably predict distortion
figures, even if SPICE was perfect.
  Reply With Quote
Old 31st July 2003, 06:54 AM   #22
uli is offline uli  Austria
diyAudio Member
 
Join Date: Dec 2002
Location: Vienna, Austria
Default cooking

IMHO real circuit design is like cooking.

You have to have the real cake first before you can put some

SPICE on it!



Uli

__________________

'Jazz is not dead, it just smells funny' F.Zappa
  Reply With Quote
Old 31st July 2003, 03:51 PM   #23
grataku is offline grataku  United States
diyAudio Member
 
Join Date: Dec 2000
Location: -
Uli,
have you tried the Figure 4 schematic? I noticed that your x200 is derived from Figure 3.
  Reply With Quote
Old 31st July 2003, 04:01 PM   #24
uli is offline uli  Austria
diyAudio Member
 
Join Date: Dec 2002
Location: Vienna, Austria
Default fig4

hi grataku,

no I didnīt, I donīt see any advantages in fig4 except
copyright issues and more money for InternationalRectifier

just kiddin

I got no time so far to build a circuit on breadboard and
manage it to work properly. The matching issue is doubled!

As Iīm not a friend of SPICE (except Tabasco sauce!)
I prefer working with real parts and this is time- and
moneyconsuming.

Uli

PS: As our great NP derives his Xes from fig3 too I donīt
see any reason not to do the same.


PPS: btw did you ever try DOOM2??
__________________

'Jazz is not dead, it just smells funny' F.Zappa
  Reply With Quote
Old 31st July 2003, 04:17 PM   #25
grataku is offline grataku  United States
diyAudio Member
 
Join Date: Dec 2000
Location: -
Default Re: fig4

Quote:
Originally posted by uli

PS: As our great NP derives his Xes from fig3 too I donīt
see any reason not to do the same

PPS: btw did you ever try DOOM2??
[/B]
PS Figure 3? Really? I just learned something.

PPS Yep, I did it all, my last "shoot them up" game was Half Life which I adored.
That was back when people were not coding the game to go with a movie.
Now they don't even need to think about the plot anymore.
  Reply With Quote
Old 31st July 2003, 05:10 PM   #26
uli is offline uli  Austria
diyAudio Member
 
Join Date: Dec 2002
Location: Vienna, Austria
Lightbulb lots of figs

As fig1 and fig3 are basically the same (in 3 some sourcefollowers
are added) just as 2 and 4 I donīt understand why your sim
works with fig2 but not with fig4.

You have to take into calculation that those figures are idealized
principle diagrams, not real circuits!
In fig2 (4) you have to add some gate bias voltage to the input
fets or use models for mosfets which are conductive at zero
gate.(or take JFETs like Erno Borbely)
To get this circuit to work properly is a "Sissiphus" task, I bet
you wonīt be able to balance all those CCSes !

Because of this issue I would prefer fig3 circuits - they allow
DC coupling (X1000) and support the theory of simplicity
(A. Einstein)

Uli
__________________

'Jazz is not dead, it just smells funny' F.Zappa
  Reply With Quote

Reply


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
Simulations in Pass Article Michael Rothacher Pass Labs 2 26th March 2008 10:49 PM
Seas L15 simulations Khron Multi-Way 3 11th April 2006 04:38 AM
Assistance with SPICE Simulations JMB Multi-Way 2 8th February 2006 09:28 PM
Protel simulations Kees Solid State 2 12th November 2002 03:47 AM


New To Site? Need Help?

All times are GMT. The time now is 02:00 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright Đ1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2