[kicad-users] Gentoo live ebuild

2007-10-13 Thread David Bourgeois

I create a live ebuild for compiling and installing kicad from SVN head  
under Gentoo linux.
Its now as simple as typing 'emerge kicad-live' to get kicad updated to  
the latest svn revision.

You can grab the ebuild at  
and copy it into your overlay.

Please let me know of any problem you may encounter.
Alternatively, I added this ebuild to the live-ebuilds overlay so it's  
possible to get it from layman. Here are the instructions.

To use the overlay you need to emerge layman and add the overlay:
emerge -va layman
echo source /usr/portage/local/layman/make.conf  /etc/make.conf
layman -f -a live-ebuilds

You can then install kicad with
emerge -va kicad-live

If a version of kicad was already installed, you will have to unmerge it  
before you'll be able to install kicad-live:
emerge -C kicad

Finally, it might be useful to update the overlay from time to time in  
case the ebuild changes:
layman -S

HTH and thanks to the active contributors that constantly improve kicad.

Please read the Kicad FAQ in the group files section before posting your 
Please post your bug reports here. They will be picked up by the creator of 
Please visit http://www.kicadlib.org for details of how to contribute your 
symbols/modules to the kicad library.
For building Kicad from source and other development questions visit the 
kicad-devel group at http://groups.yahoo.com/group/kicad-devel 
Yahoo! Groups Links

* To visit your group on the web, go to:

* Your email settings:
Individual Email | Traditional

* To change settings online go to:
(Yahoo! ID required)

* To change settings via email:

* To unsubscribe from this group, send an email to:

* Your use of Yahoo! Groups is subject to:

[kicad-users] Re: Kicad + Borland CPP (Free Turbo Version)?

2007-10-13 Thread drwrench
Hi Dick, Thanks for the reply. 

 I have not seen support for this compiler in the makefiles.  


 Do you realize what the quality level is for the GCC compiler suite
 that Kicad uses as standard?  

I don't know much about the recommended compiler but I did download 
it and will use it if I need to.

I mainly develop using Borland tools for Java, C# and Pascal 
languages. I was hoping that if I could import Kicad into Borland 
CPP builder then everything would be under one IDE and I could tryout 
the possibilites of integrating parts of Kicad into other 
applications written in other languages. 

It's more out of interest at the moment as I have no real need to use 
any CAD package and don't want to learn a new compiler suite if I can 
avoid it for now. 

But in the future I may need CAD so would like to try things out 
early on if I can and I thought the Borland route would be the 
easiest way for me.

Re: [kicad-users] Re: Mils

2007-10-13 Thread KeepIt SimpleStupid
Let's face it, humans like things easy.  It's much
easier to say 5 mills, than 5 thousanths of an
inch, although saying 250 thousanths seems to be
more of the norm when machining in english units. 
Thickness, such as a plastic bag seems to be expressed
in Mills.  Confusion, of course.

When connecting thermocouples, RED is negative.  Go

Even the metric system has it's pecularities, the
Angstrom and the micron.

My boss once said, he likes numbers to be between 1
and 10.  In other words the exponent expressed in
words such as nano, micro, pico.

I prefer metric too, but when the parts and the tools
are English, do as the Romans do and use the unit of
measure that the parts are in.


Shape Yahoo! in your own image.  Join our Network Research Panel today!   

Re: [kicad-users] Kicad project for Low TIM (Leach Amp)?

2007-10-13 Thread KeepIt SimpleStupid
It's a nice amp. You'll like it.   I taped it in 1980
or so.  Just like everyone else, I made subtle
A couple notable ones: metal film resistors where
possible.  10 turn pot for bias adjustment.  I added
audio ramping and thump supression as well.

The power supply makes a big difference in the sound. 
I used a 20 AMP constant voltage transformer and the
AMP sounded great and the hum was horrible.  I then
changed to a somewhat under rated quad custom made
torroidal transformer and the AMP was quieter, but not
as bassey.

I accidently mad a mirror image of the board and
because the design is so symmetric, I was able to use
it with a few external changes and switching the NPN
and PNP transistor positions.

Go for it.

--- j3r3m3l33 [EMAIL PROTECTED] wrote:

 Has anyone KiCAD'ed this amp:
 The second link's author said he did it in Eagle.
 By all accounts is a nice unit when built. I've
 the author where to get manufactured PCBs but no
 yet. So failing that, unless someone here has
 entered the design into Kicad, then I might do it
 post the result.


Catch up on fall's hot new shows on Yahoo! TV. Watch previews, get listings, 
and more!

Re: [kicad-users] Kicad project for Low TIM (Leach Amp)?

2007-10-13 Thread jeremy

With KiCad, and I suppose any design package, you need
to know the physical size of the components. So hopefully,
the following is not off-topic. Most component choice
results in a decision on component size, and that will
affect the layout and physical arrangement.

If I do a PCB design in KiCad for the Leach amp, and
post it, then would you like SMD or normal components?

KiCad is new to me, so I'd appreciate any pointers.

You will notice that there is a major load of doo doo
on the net (and in the shops) about speaker-lead quality,
oxygen free copper, audio-gade capacitors etc. The more
research I do on this, the more convinced I become that
we are being hoodwinked. For example, super-low loss
speaker cables can actually cause an amp to oscillate at
supersonic frequencies because the L/C characteristics
move the poles and basically mess with the amp design.
Some blind tests have revealed ordinary lamp-cord sounds
better! Similarly, snubber caps look like a waste of time.
None of the maths, physical measurements or simulations
show anything other than infinitesimal differences. Very high
bandwidth amps can be prone to oscillation. Speaker wires
are NOT transimission lines at ANY audio frequency. 
self inductance of caps is also insignificant especially with 
today's construction; 6nH of inductance per cm of lead
wire totally swamps the calculations. 

Unfortunately the list goes on.

So I am pleased to see you tell me of some of the
tweeks that actually make a difference. But I'd
like to know why. :)

Do you know why to use metal film resistors? Would
SMDs be better these days for any of the components?

In no particular order, what I think is important in component 
selection is:

1) Nominal value.
2) How its characteristics change with temperature?
3) What electrical / thermal stresses can it take?
4) Physical size.
5) How does it deviate from its ideal model?
6) Build quality and therefore reliability.
7) How the characteristics change over time.
8) Is it a very specialised component?

with 1) only some components need to be tight tolerance.
If you make everything 1%, then it just makes it expensive.
Although tight tolerance can sometimes imply better
quality and reliability.

with 2), if the value changes with temperature, and you go
for tight tolerance, then there had better be some temperature
compensation, or you may as well use a cheaper component.
Almost all practical calculations and component specifications
involve temperature. Hfe (Beta) of a bipolar transistor actually
goes up with T, some resistive devices fall with T, some increase,
Random noise increases with T. 

with 3) These are the parameters that stop your equipment
blowing up when voltages and currents and heating takes
place. The biggest characteristic that is effected is probably
physical size. 

with 4) See 3 ! Of course, this is also where component
construction technology comes in. The most notable being
capacitors. How big would a paper-oil 8000uF capacitor be?

with 5) It depends on the use as to the effect. As noted
above, at audio frequencies, self inductance of a cap
does not have a measureable effect in most (of all?)
circumstances. However, the characteristics of a mica
capacitor make it ideal for the Miller-Cap. 

6) and 7) are self explanatory except that sometimes
smaller is better, and sometimes not!

with 8) specialised components might not be in the
market for a long time. So your design could be
rapidly uneconomical to repair.

Point 8) is one reason that I like the Leach design.
It's simple. Simple can often lead to better results.

Some off-PCB notes:

I am interested to know more about the issues you had
with the transformer. I don't know what is a
constant voltage transformer. Why would the hum be
bad? Was this a physical hum? If so then this is because
of loose laminations, and unaccaptable eddy-current
losses in the iron. The iron could be poor quality for
a transformer. If so it was probably inefficient. Or it
might have been fixed by physical sheilding if the
hum was electromagnetic radiation from the transformer
picked up in the early stage of the amp.

I can't fathom how the transformer can affect base
response unless the losses were so great that the
supply voltage was affected. Any ideas on that?
Voltage is voltage, and current is current. If these
are available to the components upon demand
and at required levels, then how can one
supply sound better than another? I reckon an
amp driven by 15,000 mice in a wheel would sound
just the same as one supplied by electricity from
an oil-fired power station providing that the mice
were well fed, we have a few 'subs' and we don't run out of oil.

Toroids tend to be low-noise, compact but draw a large
surge current on turn on. They are very efficient. The 
radiate less because of small or insignificant air-gaps
which otherwise radiate flux, and the construction gives
good sheilding.

Maybe the high efficiency of the toroid reduces its
regulation. (No load