Re: gEDA-user: very backward time step?

2010-09-28 Thread Chitlesh GOORAH
On Thu, Sep 23, 2010 at 2:52 PM, al davis wrote: It is important to developers that the unstable distros DO package the development branch, to test it and provide feedback. Hamish and Chitlesh, how about it? Ok, I'll try to update Fedora's gnucap this weekend. I've taken over the ownership

Re: gEDA-user: very backward time step?

2010-09-23 Thread al davis
On Tuesday 21 September 2010, Rubén Gómez Antolí wrote: Gnucap 2009.12 is so stable, why not released? (In several days, I think even ask at debian maintainer to include snapshots, at least, in experimental branch of Debian.) The problem is with the build system. I spent most of January

Re: gEDA-user: very backward time step?

2010-09-23 Thread gedau
On Thu, Sep 23, 2010 at 08:52:26AM -0400, al davis wrote: On Tuesday 21 September 2010, Rub?n G?mez Antol? wrote: Gnucap 2009.12 is so stable, why not released? (In several days, I think even ask at debian maintainer to include snapshots, at least, in experimental branch of Debian.)

Re: gEDA-user: very backward time step?

2010-09-21 Thread Chris Cole
Thanks for all the replies everyone, but I think I should have started with something a little simpler and built off that. Now I can't even model a simple AC source in series with a resistor...I tried to do it in straight gnucap and eliminate gschem to try to narrow down the culprit. Attached

Re: gEDA-user: very backward time step?

2010-09-21 Thread al davis
On Tuesday 21 September 2010, Chris Cole wrote: I get a normal sine wave output, but when the frequency increases, the wave changes considerably and starts to turn into a triangle wave...I'm not sure what I'm doing wrong, but this is strange. In the tran command (tran 10m 10 1) you asked it

Re: gEDA-user: very backward time step?

2010-09-21 Thread Chris Cole
On Tuesday 21 September 2010, Chris Cole wrote: I get a normal sine wave output, but when the frequency increases, the wave changes considerably and starts to turn into a triangle wave...I'm not sure what I'm doing wrong, but this is strange. In the tran command (tran 10m 10 1) you

Re: gEDA-user: very backward time step?

2010-09-21 Thread asomers
In this case, the solver will not need to add extra steps internally. You specified a sin generator, whose output is a simple function of time, and a resistor. The whole circuit is memoryless. At 60Hz, the period is just 16.6ms. With a 10ms step size, of course you're going to see an aliased

Re: gEDA-user: very backward time step?

2010-09-21 Thread Matthew Wilkins
. - Original Message From: Chris Cole cle...@gmail.com To: geda-user@moria.seul.org Sent: Tue, September 21, 2010 12:27:30 PM Subject: Re: gEDA-user: very backward time step? On Tuesday 21 September 2010, Chris Cole wrote: I get a normal sine wave output, but when the frequency

Re: gEDA-user: very backward time step?

2010-09-21 Thread al davis
On Tuesday 21 September 2010, Matthew Wilkins wrote: You're specifying a 10 ms step size (first parameter in the tran command), and it looks like that's what you're getting. The period of a 60 Hz sine wave is 16.6 ms, so you're getting fewer than 2 samples per cycle. Try changing the step

Re: gEDA-user: very backward time step?

2010-09-21 Thread Matthew Wilkins
Subject: Re: gEDA-user: very backward time step? On Tuesday 21 September 2010, Matthew Wilkins wrote: You're specifying a 10 ms step size (first parameter in the tran command), and it looks like that's what you're getting. The period of a 60 Hz sine wave is 16.6 ms, so you're getting fewer than 2

Re: gEDA-user: very backward time step?

2010-09-21 Thread al davis
On Tuesday 21 September 2010, Matthew Wilkins wrote: It seems like the values that he gave (10m 10 1) could be interpreted either way, but in the plot image it shows about 15 data points between the times 4.9219 and 5.0781. That seems to correspond to 10 ms times steps, no? Could be ... one

Re: gEDA-user: very backward time step?

2010-09-21 Thread Chris Cole
On 09/21/2010 01:56 PM, al davis wrote: On Tuesday 21 September 2010, Matthew Wilkins wrote: It seems like the values that he gave (10m 10 1) could be interpreted either way, but in the plot image it shows about 15 data points between the times 4.9219 and 5.0781. That seems to correspond to

Re: gEDA-user: very backward time step?

2010-09-21 Thread Rubén Gómez Antolí
Hello all: El 20/09/10 20:29, John Doty escribió: On Sep 20, 2010, at 11:48 AM, al davis wrote: [...] With 0.35, I had to make gmin=100u. With the latest, it worked fine as is. Al, I think it would really help if you made a release. All of the distros are stuck at 0.35, so that's

Re: gEDA-user: very backward time step?

2010-09-20 Thread al davis
On Friday 17 September 2010, Chris Cole wrote: I'm trying to do a very simple power supply simulation with gschem and I'm not getting very far. I'm trying to do a bridge rectification of a 24 VAC supply to DC current. I'm able to do a transient analysis for 10 iterations before I get:

Re: gEDA-user: very backward time step?

2010-09-20 Thread John Doty
On Sep 20, 2010, at 11:48 AM, al davis wrote: As usual, John Doty is wrong. Gee, I try to help the guy, and insert what I think is a reasonable disclaimer ( this is a gnucap question, not a gschem question. But if the tran command in gnucap is like the SPICE tran command, ...), show him an

gEDA-user: very backward time step?

2010-09-17 Thread Chris Cole
Hi all, I'm trying to do a very simple power supply simulation with gschem and I'm not getting very far. I'm trying to do a bridge rectification of a 24 VAC supply to DC current. I'm able to do a transient analysis for 10 iterations before I get: very backward time step convergence failure,

Re: gEDA-user: very backward time step?

2010-09-17 Thread John Doty
On Sep 17, 2010, at 9:20 AM, Chris Cole wrote: I'm trying to do a very simple power supply simulation with gschem and I'm not getting very far. Well, this is a gnucap question, not a gschem question. But if the tran command in gnucap is like the SPICE tran command, you're specifying a