and
saturates the core so waveforms are not sinusoidal.
Wojciech Kazubski
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from Vx to ground. If both loads are equal, both
rectified curreant are equal and cancel one another. If the loads are
different, the imbalance current charges Vx node until both output currents
become equal again. To avoid this place a choke between Vx and ground.
Wojciech Kazubski
/howExplained.htm
This is not good, the user has to remember that A means ECB, B means EBC,
F means SDG, K means GAK (for SCR)... . Such suffix is also used for
mechanical variant of the package like in TO220AB
Wojciech Kazubski
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think that plain TO92
footprint should have numbered pins for use for MC78Lxx, MC79Lxx regulators,
LM35 temperature sensors, etc.
Wojciech Kazubski
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for special virtual components that do not have footprints.
The main problem may be the compatibility with current system.
Wojciech Kazubski
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.
Wojciech Kazubski
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Hello!
Is gsch2pcb reading gafrc or any other config file?
I am looking for easy way to configure another location of m4 footprints. I
know that gsch2pcb looks for several default locations and there is a
commandline option to tell the alternate one, but it has to be typed in each
time
under certain circumstances.
Wojciech Kazubski
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, the first letter of the
label must be X.
It would be nice to have a special atribute spicetype or so to force the
spice to use the proper model. Long time ago I proposed this, but it was not
implemented in spice-sdb backend.
Wojciech Kazubski
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readable shematic if the circuit is not trivial.
As an exercise, you can try to extract the schematic from an old PCB (with
components soldered)
Wojciech Kazubski
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Wojciech Kazubski wrote:
- Anyone use these shunt regulators? I'm wondering about the max voltage.
Or set up your mailer to use a fixed-width font..
Yes, that was it - thanks.
I suspect this TL431 isn't a good device for my app. I have an LM317 to
give me around +12V for bootstap
voltage of the transistor.
Wojciech Kazubski
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often have to
tune sizes witch much better accuracy.
Wojciech Kazubski
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TO39 footprint, a pinout and possibly some other info. Additional layer may
add for example order or storage number. The same graphic symbol could be
shared for all parts 2N3055, 2N2369, BC107, BC237, BC547, BC847, BF240 ...
Wojciech Kazubski
when the pad
is close to sqaure.
I cannot see the barring, but if I zoom much using the scroll wheel of the
mouse, the soldermask disappears and comes back several times. At even higher
zoom strange green areas are visible.
(PCB 20081128 built from tarball for i586)
Wojciech Kazubski
, displayed at the end of make install,
should be ok.
Wojciech Kazubski
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These gEDA-gaf RPMs will replace your existing fedora geda rpms
without breaking anything.
Fedora 10 and Fedora 11 can grab these RPMS (both 32bit and 64 bit nodes) from
http://chitlesh.fedorapeople.org/gEDA/
or yum install gEDA-gaf --enablerepo=gedatest
if you have paste the following
On Thu, Sep 3, 2009 at 8:36 AM, Wojciech Kazubskiw...@o2.pl wrote:
Why libgeda and libgeda-devel packages have old style version number
(20090830) instead of new 1.5.4?
Wojciech
I did a mistake in the past and now I'm paying the price :)
Well the mistake was that before gEDA's
in the setting menu.
That's why.
Select all the lines and do
:ClrFlag(Selected,Join)
j key toggles poligon join flag for the line segment pointed by the cursor.
Wojciech Kazubski
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http
!). The artwork was then
copied to natural size negative by a huge camera. The minimum line width that
time was about 0,5-0,6mm (20-24mils).
Wojciech Kazubski
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board - just a double sided board with nothing
on one side.
Wojciech Kazubski
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Hello!
PCB has an option to create drill helper when exporting to Postscript files.
Is it possible to control the size of the white dot that marks the drill
center?
Wojciech Kazubski
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http
Hello!
PCB has an option to create drill helper when exporting to Postscript files.
Is it possible to control the size of the white dot that marks the drill
center?
Wojciech Kazubski
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http
(wide) at
luciani.org
(* jcl *)
--
You can't create open hardware with closed EDA tools.
http://www.luciani.org
Wojciech Kazubski
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Hi
Were those icicles really pointing up?
http://people.redhat.com/dj/ice-storm-2008/img_0321.html
Wojciech Kazubski
Hi,
The Northeast (U.S.) was hit with a major ice storm. IIRC
gedasymbols.org is on DJs server which is located in
NH. On the news tonight they were saying that some
NH
/directory/gafrc
It should contain a line like this:
...
(component-library ${HOME}/directory/where/the/symbols/are/stored)
The gschem searches the libraries starting from the last one, so your private
symbol directory should be defined last.
Wojciech Kazubski
It seems to work except for one
the vector one
(visible on screen), which also may cause some unwanted clipping.
In my opinion , the exporter should use specified dpi resolution and variable
size for PNG (and other bitmap) format. Default resolution should be 100dpi
for good quality.
Wojciech Kazubski
Why do you include PNG
of the output transistor. The collector
should have pintype oc, but it is legal to connect it directly to positive
power supply if the load is provided in emiter circuit. The same apply for
emiter pin.
Wojciech Kazubski
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numbered
'n1' and 'n2.
Wojciech Kazubski
I used gnetlist -g PCB and saw the n1 and n2 pin numbers in
output.net. I also see pins like n+ and n-.
output.net is below. I can post the schematic, if it will help.
In pcb, none of the resistors or capacitors are connected with the
ratsnest
On Jun 29, 2008, at 4:49 AM, Wojciech Kazubski wrote:
This is a bug in the library. The symbol pot-1.sym should have all
pins declared as passive instead of input/output.
No, it's a conceptual problem with DRC. It is perfectly reasonable to
consider the pins on a pot as inputs
For reference in case somebody sees this thread in the future:
I opened 4017.sym with gschem, edit-show inv text, removed the
vss/vdd and added two pins, vdd(pin no 16) and vss (pin no 8).
Set the pintype to in.
Power supply pins (and GND pins) shoud have pintype set to pwr.
Wojciech
Wednesday 04 of June 2008 11:55:26 Kai-Martin Knaak napisał(a):
I am curious, just how heterogeneous the group of geda users and
developers is. So I thought, I'd start this little non-random sample poll
in the mailing list:
* What OS do you run geda applications on?
Fedora 9 (latest) on
all configuration.
If DESTDIR contains anything then the package is installed to an intermediate
location and desktop and mime databases should be updated by package manager
during final installation.
Wojciech Kazubski
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is defined in qfpdj.inc as:
...
define(`PKG_QFP_50', `PKG_GENERIC_QFP(`$1',`$2',`$3',`$4',`$5',
`50',`28',`20', `80',`0',`$6')')
...
here 6th parameter defines pin spacing and is set to 50.
Wojciech Kazubski
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an external net= attribute or
add/create the suitable power symbol.
Wojciech Kazubski
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the footprint with thermal pad
available as LQFP128_14_EP. The last number defines pad size in 0.01mm.
Wojciech Kazubski
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lower voltage rating (VDD - VSS to
6V max, VDD - VEE to 10V max). Pinout is the same.
Wojciech Kazubski
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) to a net +5Vd, or
b) hint what power symbol to use (74power-1.sym in this case), or
c) create a custom power symbol (embedded?) if there is no suitable one
available.
Wojciech Kazubski
On Dec 20, 2007, at 5:47 AM, Klaus Rudolph wrote:
Having multiple netnames should not be a problem
, intended for use with
previous releases of gEDA.
I wonder if efforts are better spent on adding/improving the analog
capabilities of gtkwave instead.
-Dan
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Look into config.log file generated by configure script. This file may contain
the hint, what is really going on.
Wojciech Kazubski
And the fun continues...
I have
gtk+-devel
gtk2-devel
glibc-devel
guile-devel
gettext-devel
flex
bison
make
gcc
gcc-c++
I then tried
(hand soldering, wave, heat transfer etc.)
while transfering the design from gschem to pcb.
Wojciech Kazubski
some footprint outlines suggested by manufactures are only useful for
automatic hot air soldering (ie. DFN14 of LTC4088 from Linear).
For hand soldering extended pads are necessary
pkg-config --modversion gtk+-2.0
2.12.1
On Fedora 8 (just upraded)
Wojciech Kazubski
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VCC net from
TTLs and VDD from CMOSes to +5Vd or so if user wants this.
Recently I had some problems with connecting VSS power supply of 4000 series
CMOS chips to the ground net named GND. Simply connecting two power symbol to
ground doesn't work.
Wojciech Kazubski
defaults for gschem by placing following lines in
${HOME}/.gEDA/gschemrc file:
(define default-titleblock title-A4.sym)
(net-style thin)
(pin-style thin)
This set the proper paper size and forces lines on schematic to be thinner.
Wojciech Kazubski
-20060905.tar.gz
The symbols are about the same size as in other schematic capture programs.
Complaint #3, and minor, is that the printout is BW. Even when fed to a
color capable printer.
This is controlled by geda-gschemrc lines
(output-color disabled)
;(output-color enabled)
Wojciech Kazubski
On Tue, 2007-09-11 at 13:59 -0400, Ales Hvezda wrote:
If someone thinks the attached symbol is ok, I'm pushing it to the repo.
How do you know that this pinout is correct? What other packages does
an lm7912 come in other than TO-220? There isn't a footprint=
attribute in the
You can also try garchive program. It should create an archive containing all
given schematics and a library of symbols used in them.
Wojciech Kazubski
Look at the gschlas program
I tried this with gschlas, but each component got an extra refdes
attribute (in red) with R? U? etc
...
Thats right. Whenever I work with Protel, I begin a new file about every
two hours as file corruption happens sometimes. But it's M$ Windoze
software :) Somewhat OT, BTW.
Today a polish newspaper said, that the new train launched yesterday for the
route between Warsaw and Lodz had
I use short 0.1 pins on the components that have no visible pin numbers
(mainly discretes).
Wojciech Kazubski
What is the intention of the recommended length of pins?
Consistency, I'm guessing.
It also gives you room to put the pin numbers
?
---(kaimartin)---
Wojciech Kazubski
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For m4 parts, look for those that have dimensions (especially pin spacing)
specified by big numbers and then divided by 100 or 1000. This significantly
reduces the accumuluation of pin spacing errors. M4 has integer arithmetics, so
the resulting pin positions are rounded to 1mil.
Wojciech
I propose to split old (m4) libraries into separate package. Then noone would
be forced to have them and anyone will use only those libraries he wants/needs
(maybe better ones?).
Wojciech Kazubski
Here, we never ever use them.
Dumping the low resolution land patterns would encourage
...
Here's the COMPLETE list of newlib footprints:
2_pin_thru-hole_packages/0.125W_Carbon_Resistor
2_pin_thru-hole_packages/1W_Carbon_Resistor
...
I thought about 3-rd party libraries as jcl.
BTW I can try to look into m4 libraries and convert them to new format
Wojciech Kazubski
standarization of drills and pad diameters used.
Also some internal variables should be changed since common component
references are confused with them.
Please keep them as m4 for now, though ;-)
OK. m4 programing is not very hard. I already have some practice in it.
Wojciech Kazubski
on schematic).
Wojciech Kazubski
On Fri, Jul 13, 2007 at 08:31:20AM +0200, Jonatan ?kerlind wrote:
I've only come up with the solution to edit the 5V IC symbol and remove
the Vcc net attribute and attach a Vcc pin instead. Any other (better)
solutions?
The ultimate solution is to make all
off
the proper place.
Wojciech Kazubski
Having made a number of boards at home now, I'm thinking the drill
helper could be better. My local copy does this instead: If you check
drill helper, all pins are drawn with a much smaller drill hole.
I.e. it doesn't draw the normal-sized hole
Hello!
Try xnec2c by Neoklis (Nick) 5B4AZ:
http://5b4az.chronos.org.uk/pages/nec2.html
Wojciech Kazubski
Hi, I'm searching for a graphical editor for antennas that produces input
files for NEC (for those that don't know NEC:
http://en.wikipedia.org/wiki/Numerical_Electromagnetics_Code).
So
)
Also ITME (http://www.itme.edu.pl/PRsurface.htm) makes some equivalents of
similar filters (datasheets are in MS Word)
SAW filters are now manufactured by EPCOS http://www.epcs.com
Wojciech Kazubski
Hi list,
Could anyone provide me information about the SAW filter produced by Siemens
named
Vertically mounted TOP-3 is in geda.inc library as TO247 (another synonim for
the same package). This is m4 footprint.
Wojciech Kazubski
Hi,
Local electronics store sells BD249 and BD250 with TOP-3 packages. The
datasheets I found on the web say BD249 is SOT-93. I can't find
footprints
in by the newer GTK library as it wishes.
Use RPMs if you can.
Fedora Core 6 currently has gtk2 2.10.4 in updates (and anything needed for
it), see
http://download.fedora.redhat.com/pub/fedora/linux/core/updates/6/
Wojciech Kazubski
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I propose splitting all pcb libraries into separate tarballs. Then each user
may load only the libraries he needs. Those who like M4 (as me) coud use them
but it will not make others (who prefer newlib) angry.
Wojciech Kazubski
Kurt,
My system searches for the m4's, but I've changed
The schematics printed with gschem used to have a very elegant and
polished style. Now, after having upgraded to the latest and greatest
version, I notice that graphic lines (including component symbols) are
much lighter/thinner than nets, thus degrading elegance and
readability. The
.sch]---
v 20061020 1
C 0 2000 0 0 0 title-A.sym
---File end---
or
---File begin [test2.sch]---
v 20061020 1
C 2000 0 0 0 0 title-A.sym
---File end---
Try to print them with default settings.
Wojciech Kazubski
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amplifiers cannot be
operated on the frequences as high as in linear mode (class A) with higher DC
current.
But I think that this may be a problem above VHF band.
Wojciech Kazubski
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or IF) In this case oscillations are at or near operating frequency.
Sometimes amplifiers oscillate on LF due to bad supply decoupling.
Wojciech Kazubski
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see what I expect up to about 18mHz and then it oscillates.
What am I doing wrong?
You can try to use qucs instead of spice. This is a real RF/microwave
simulator. I also had problems with simulating transmission lines in spice.
Wojciech Kazubski
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