On Saturday 13 October 2007, Peter Clifton wrote:
First, before I forget, thanks Peter.
On Sat, 2007-10-13 at 08:39 -0400, Gene Heskett wrote:
Complaint #1 is that the diode bridge symbol is about 1/8th the area of a
landscape letter page, occupying many times the real estate that the DPDT
On Tuesday 13 November 2007, Peter TB Brett wrote:
On Tuesday 13 November 2007 13:31:40 ED wrote:
Not sure if its what you were looking for, however we have been playing
with these FTDI chips for a little while now and they have been working
great. Basically you plug this little beast in and
On Thursday 20 December 2007, Peter Clifton wrote:
Hi,
I'm fixing (or trying to) a TV for a friend, and wondered if anyone had
any wisdom relating to the following symptom.
This is a Sony BE-3D chassis, and exhibits an intermittent fault. When
its doing it, the picture is still visible, but
On Saturday 22 December 2007, Darryl Gibson wrote:
Dan McMahill wrote:
By far the worst shock I've ever received was 23 years ago working on a
Fender Bassman that was unplugged. I will *never* forget to discharge
caps again. Especially ones charged up to 500 volts. Thats one of
those
On Tuesday 18 March 2008, John Coppens wrote:
Hi all.
Though this evidently is not a software defect, I'm wondering if someone
on the list knows the cause of this problem or experienced similar
effects.
I was testing another paper (touted by a local electronics magazine as
'ideal') for my
On Tuesday 18 March 2008, Samuel A. Falvo II wrote:
On Tue, Mar 18, 2008 at 9:14 AM, John Coppens [EMAIL PROTECTED] wrote:
I was testing another paper (touted by a local electronics magazine as
'ideal') for my quick-and-dirty toner-transfer PCBs, and found a strange
defect, hard to describe.
On Tuesday 18 March 2008, John Coppens wrote:
On Tue, 18 Mar 2008 14:09:30 -0400
Gene Heskett [EMAIL PROTECTED] wrote:
I'm thinking there might be a liquid
buildup there that would spatter away as the heat was applied to this
much less porous medium, particularly if the heating effect
On Sunday 13 April 2008, Jesse Gordon wrote:
Ormund,
If all else fails, and if you can find two documents describing in
simple terms each of the formats, I'd be willing to try making a perl script
to convert for you. But I'm pretty busy, so make sure there's not
already such free solution :-)
On Sunday 13 April 2008, Ormund Williams wrote:
On Sun, 2008-04-13 at 13:54 -0400, Gene Heskett wrote:
A list lurker, speaking up as I run EMC2 on a tabletop mill here.
This seems like a neat idea Jesse, but can gerbv show 3D? RS-274-D, from
NIST, as interpreted by late versions of EMC2, can
On Sunday 13 April 2008, Gene Heskett wrote:
On Sunday 13 April 2008, Ormund Williams wrote:
On Sun, 2008-04-13 at 13:54 -0400, Gene Heskett wrote:
A list lurker, speaking up as I run EMC2 on a tabletop mill here.
This seems like a neat idea Jesse, but can gerbv show 3D? RS-274-D, from
NIST
On Sunday 13 April 2008, Jesse Gordon wrote:
Gene Heskett wrote:
On Sunday 13 April 2008, Jesse Gordon wrote:
A list lurker, speaking up as I run EMC2 on a tabletop mill here.
This seems like a neat idea Jesse, but can gerbv show 3D? RS-274-D, from
NIST, as interpreted by late versions
On Monday 14 April 2008, Jesse Gordon wrote:
Gene Heskett wrote:
On Sunday 13 April 2008, Jesse Gordon wrote:
:) Yes, but a utility to extract, and make gcode out of the copper
: pattern
removal, would be a very useful utility.
I thought about that, but it's far above my math skills
On Sunday 27 July 2008, gene wrote:
have you guys seen the 'tin-whisker' problem with lead free solder?
Yes, heck I've seen it with leaded solder. The alloy RCA used to mount their
tv
set PCB's to the chassis frames both fractured rapidly, and did that in as
little as 6 months to 5 years.
On Sunday 27 July 2008, Bob Paddock wrote:
On Sunday 27 July 2008 07:49:10 am gene wrote:
have you guys seen the 'tin-whisker' problem with lead free solder?
Note that these links are from 2006, but still give an interesting
background.
On Saturday 20 December 2008, DJ Delorie wrote:
If it were me, I'd just use round holes with sizes calculated from the
tab sizes. It might be a bit of guesswork, though, as they don't list
the tab thickness on the spec sheet. But that's because I don't have
a drill that makes rectangular holes.
On Friday 26 December 2008, Peter Clifton wrote:
On Fri, 2008-12-26 at 21:00 -0500, gene wrote:
What does it mean when manufactures specify 'Endurance @ temp' or 'life
time @ temp'? For example, one company claims:
Endurance : 105 C 1000 h to 5000h
Then they further state that after testing
On Saturday 27 December 2008, Robas, Teodor wrote:
Do not count on this kind of capacitors:
http://deep-blue.ro/tmp/chinese%20capacitor.jpg
:))
What a ripoff. No way in hell that would last more than a day, if that long
with 50 volts of bias on it, (I'd guess 10 minutes max) and I'd have
On Saturday 27 December 2008, Dan McMahill wrote:
Gene Heskett wrote:
They can explode pretty violently, so let me tell you a story. Back in
the mid-60's I came across a tube type, mobile cb radio that had to be one
of the few attempts to build one for a 6 volt vehicle system, and predated
On Sunday 28 December 2008, der Mouse wrote:
[Electrolytics] can explode pretty violently, so let me tell you a
story. [...785V on a 450V cap...serious dent in plaster...]
My exploding cap story is not quite so impressive, but I know I
certainly found it convincing. I put together a circuit -
On Monday 29 December 2008, Bill Gatliff wrote:
KURT PETERS wrote:
Just curious, I wonder what's inside the blue one?
:-)
Turtles. All the way down. :)
ROTFLMAO!
b.g.
--
Cheers, Gene
There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use
On Friday 16 January 2009, Steven Michalske wrote:
it's called the knack.
http://www.youtube.com/watch?v=CmYDgncMhXw
:-)
Chuckle, I was wondering when somebody would make a video out of that classic.
Thanks for the link, bookmarked for future use. :)
On Jan 15, 2009, at 8:50 PM, Steve
On Wednesday 21 January 2009, Patrick Dupre wrote:
Hello,
After I made a pcb, can I duplicate it on the same silk ?
Then I go get several at the same time.
Thank
If you mean making another pcb by using the same silk, yes. We used to do
that 40 some years ago at a tv station, where such things
On Thursday 26 February 2009, John Luciani wrote:
The video of Stuarts gEDA talk is at http://ignite.oreilly.com/news.html
(* jcl *)
Unforch with a quad core phenom and 4GB of memory, plus mplayer-3.55, it plays
at about 2% of normal speed, with no discernable cpu or drive activity even
after
On Tuesday 31 March 2009, DJ Delorie wrote:
Do you know anyone with a sheet metal shear?
I had my eye on either the small 8 HF shear or a slightly larger 12
Grizzly one. I have a friend who is a metalworker, too, and yes, I
was planning on asking him if he had one.
By panel I meant 6x10, not
On Wednesday 01 April 2009, Ethan Swint wrote:
Gene Heskett wrote:
On Tuesday 31 March 2009, DJ Delorie wrote:
Hey, they have a 4.5 diamond blade that will fit in my table saw,
too. They don't say how wide it is, though.I think those are meant for
sawing concrete or ceramic tiles, so
On Friday 03 April 2009, andrewm wrote:
If anybody has a better idea, yelp.
EDM ?
Humm, hadn't thought of that, but I did that a couple of years ago, removing
some broken 6-32 taps from some blind holes about 3/4 deep. This was while
building a new z axis drive for my micromill. PIMA to do,
On Friday 03 April 2009, evan foss wrote:
On Fri, Apr 3, 2009 at 6:36 PM, andrewm andr...@thehacktory.com wrote:
If anybody has a better idea, yelp.
EDM ?
Don't you aready need a hole to run the wire threw?
A hole for a wire through it? No.
Or are you just
going to live with a very thin
On Friday 03 April 2009, evan foss wrote:
On Fri, Apr 3, 2009 at 8:24 PM, Gene Heskett gene.hesk...@verizon.net
wrote:
On Friday 03 April 2009, evan foss wrote:
On Fri, Apr 3, 2009 at 6:36 PM, andrewm andr...@thehacktory.com wrote:
If anybody has a better idea, yelp.
EDM ?
Don't you aready
On Wednesday 08 April 2009, Mike Hansen wrote:
Quick FYI:
The FTDI USB UARTs have noise immunity issues. They tend to lock up after
running for an hour or so. And worst of all they only reset themselves
when the USB cable has been physically removed. It's a well known problem.
I would
On Friday 15 May 2009, Dan McMahill wrote:
John Doty wrote:
So will the 6L6, but few engineers ever have reason to design with
one.
However, those who do make oodles of money. Audio freaks seem to have
pockets of infinite depths.
Sure, but so what? There's no need to train the average EE to
On Friday 15 May 2009, Eric Brombaugh wrote:
al davis wrote:
On Thursday 14 May 2009, Joerg wrote:
What I bemoan is the utter lack of hands-on experience. Most
newly minted engineers can't even solder properly. Pathetic.
So sad.
I recently saw a post on an email list that did a very good
On Friday 15 May 2009, al davis wrote:
On Friday 15 May 2009, Dan McMahill wrote:
this thread has degenerated a bunch, but I would argue
that the average EE should be able to design with a 6L6.
Actually, maybe something like a 12AX7 (triode) would be
better. Why do I say such a crazy
On Wednesday 20 May 2009, Steve Underwood wrote:
Levente wrote:
Hi,
I have to design an audio amplifier that can deliver 100Amps. It should
work around 50Hz, and the maximum output power shall be 500W. I am
currently reading articles about this topic, but it is very hard to find
things like
On Wednesday 20 May 2009, Joerg wrote:
DJ Delorie wrote:
Levente Kovacs leventel...@gmail.com writes:
230V times 100A is something I dont want to even calculate.
It's 23000 :-)
My air conditioner draws 123 amps at 240 volts for the first few
seconds. That's almost 30kW.
Seconds and not
On Wednesday 20 May 2009, DJ Delorie wrote:
Seconds and not fractions or a second? Yikes! Unless it's a 10-15
ton unit that doesn't sound normal.
I think it's a 60 ton. It draws 30 amps once it's running. Yeah,
seconds, not fractions. They had to upgrade the transformer on the
pole to supply
: geda-user-boun...@moria.seul.org
[mailto:geda-user-boun...@moria.seul.org] On Behalf Of Gene Heskett
Sent: Wednesday, May 20, 2009 3:12 PM
To: gEDA user mailing list
Subject: Re: gEDA-user: [OFF] high current amplifier
...
Is this data obtained from a Kill-a-watt?
D
I have heard
On Wednesday 20 May 2009, Joerg wrote:
Gene Heskett wrote:
On Wednesday 20 May 2009, Joerg wrote:
DJ Delorie wrote:
Levente Kovacs leventel...@gmail.com writes:
230V times 100A is something I dont want to even calculate.
It's 23000 :-)
My air conditioner draws 123 amps at 240 volts
On Wednesday 20 May 2009, DJ Delorie wrote:
Not even a 40 horse compressor in a 22 ton (rated, yeah sure) Lennox
will draw that much for that long.
Gee, you guys are making me feel bad. Now I have to go out and
research air conditioners :-P
Anyway, I know I have a 60 amp circuit for it, and
On Wednesday 20 May 2009, Levente Kovacs wrote:
We want to avoid transformers. The older version of this equippment had the
good old Quad-405 power amplifiers, and transformers at the end. It is so
heave, that one man can hardly lift the unit.
Btw... the same unit must also provide a voltage
On Wednesday 20 May 2009, der Mouse wrote:
A ton of cooling is 12 Kbtu, about the heat of crystallization of
one ton of water, per hour.
Why do engineers use so many whacky units?
[...], tradition and convenience.
Good excuses for the masses. Not so good for engineering, which
depends on
On Wednesday 20 May 2009, Joerg wrote:
Gene Heskett wrote:
On Wednesday 20 May 2009, Joerg wrote:
Gene Heskett wrote:
On Wednesday 20 May 2009, Joerg wrote:
DJ Delorie wrote:
Levente Kovacs leventel...@gmail.com writes:
230V times 100A is something I dont want to even calculate.
It's 23000
On Wednesday 20 May 2009, DJ Delorie wrote:
Then put a time delay to off of at least 3 to 5 minutes into the
condensor fan circuit only,
I don't have that kind of control over it. I have one low-voltage
control loop to tell it on/off, and that's it.
It is _your_ AC, right? You have every
On Wednesday 20 May 2009, DJ Delorie wrote:
It is _your_ AC, right?
Well yeah, but I don't want to fiddle with it *that* much. Besides, I
don't know that they don't already do what you've suggested. IIRC the
fan and compressor turn on separately, they might turn off separately
too. I've never
On Thursday 21 May 2009, DJ Delorie wrote:
I'd kill 2 birds then, and grab a lawn chair and a beer, and sit
beside it while its running long enough to run out of beer. :)
Or just ask Pat to listen for it. She sits out there a lot - the A/C
is next to the screen porch.
Chuckle, passing the
On Thursday 21 May 2009, Joerg wrote:
Gene Heskett wrote:
[...]
But I can't really bleed off freon. Plus AFAIK they don't sell that
stuff to ordinary folk anymore unless you have a contractor's license. I
mean, I could get one, but that would go a bit far ;-)
Its no better on this side
On Thursday 21 May 2009, Joerg wrote:
[...]
Wow, I've never been in a close call like that one. Only once in a small
Dornier aircraft when the (otherwise totally quiet) bush pilot kind of
guy let off a lot of cuss words, the stall horn was blaring, pine tree
tops came at us and it was of course
On Friday 22 May 2009, Joerg wrote:
John Doty wrote:
On May 21, 2009, at 6:00 PM, Joerg wrote:
Chris Albertson wrote:
[...]
I'm thinking about tube amps that had an output impedance of about 1M
ohm that used transformers to drive 8 ohm speakers. About a 100,000
to 1 ratio.
1M? What kind
On Friday 22 May 2009, Joerg wrote:
I'll second that. Did it in Spain but the track owner from whom I also
rented the go-kart didn't want me on there anymore after my power-slides
blew out the 2nd tire (including some smoke plumes). They must be rather
expensive.
40 years ago, those slicks were
On Saturday 23 May 2009, Joerg wrote:
Gene Heskett wrote:
On Friday 22 May 2009, Joerg wrote:
John Doty wrote:
On May 21, 2009, at 6:00 PM, Joerg wrote:
Chris Albertson wrote:
[...]
I'm thinking about tube amps that had an output impedance of about 1M
ohm that used transformers to drive 8
On Saturday 23 May 2009, Joerg wrote:
Gene Heskett wrote:
On Friday 22 May 2009, Joerg wrote:
I'll second that. Did it in Spain but the track owner from whom I also
rented the go-kart didn't want me on there anymore after my power-slides
blew out the 2nd tire (including some smoke plumes
On Saturday 23 May 2009, John Doty wrote:
On May 23, 2009, at 7:56 PM, Gene Heskett wrote:
To me, a 6AU6 is a newer
tube. 6SJ/K7's are middle aged, and the 4X's were popular for
small signal
2A3's for audio output's about the time I was born. And all are
transconductance pikers compared
On Monday 03 August 2009, John Doty wrote:
On Aug 2, 2009, at 5:20 PM, Bill Gatliff wrote:
One of the ways that the gdb guys cracked this nut was to push a
lot of
their functionality into libraries, and create an HID-centric API for
them. They include a command-line-interface implementation
On Thursday 24 September 2009, Gareth Edwards wrote:
http://www.electronicsweekly.com/Articles/2009/09/24/47028/premier-farnell-
buys-design-software-firm-cadsoft.htm
I wonder what this will do to the freebie download that lets us all look at
eagle files. That has come in handier than bottled
On Friday 25 September 2009, gene glick wrote:
DJ Delorie wrote:
I talked with Dan about it, we seem to think it's better to not use
the ground plane for the return signal, and route the return the same
way you route the audio. Think of it like a differential pair. That
way, you get current
On Monday 19 October 2009, Bob Paddock wrote:
Boss just sent around something he got from a consultant on
doing proper EMI design (which I've been doing for years already,
I thought until consultant came up with this):
Eliminate separate Vcc planes.
What's he/she smoking, it must be great stuff
On Monday 19 October 2009, Dan McMahill wrote:
Larry Doolittle wrote:
Good RF decoupling standard practice is to use a smaller cap
(e.g. 20pF in parallel with some larger ones such as 1000pF
_and_ 0.1uF or larger as needed) to get a good broad band
capacitive reactance across frequency).
I
Greetings;
Does geda have a .pcb file viewer, such as is output by the ExpressPCB free
software for windows? I've got a small tabletop milling machine, and have
been asked to do a board that is about half the size of a postage stamp.
And, if so, can it convert a .pcb into a couple of .ngc's
On Sunday 25 October 2009, Peter Clifton wrote:
On Sun, 2009-10-25 at 07:55 -0400, Gene Heskett wrote:
Greetings;
Does geda have a .pcb file viewer, such as is output by the ExpressPCB
free software for windows? I've got a small tabletop milling machine,
and have been asked to do a board
On Sunday 25 October 2009, Harry Eaton wrote:
Does geda have a .pcb file viewer, such as is output by the ExpressPCB
free software for windows? I've got a small tabletop milling machine,
and have been asked to do a board that is about half the size of a
postage stamp.
And, if so, can it
On Sunday 25 October 2009, John Luciani wrote:
There is a python script, from the MIT Media Lab, that converts
Gerber files into a format used by a Roland milling machine.
The python script is at
http://web.media.mit.edu/~neilg/fab/dist/cam.py
And massaging that to output RS-274-D stuff might
On Sunday 25 October 2009, Peter Clifton wrote:
On Sun, 2009-10-25 at 11:25 -0400, Harry Eaton wrote:
Does geda have a .pcb file viewer, such as is output by the ExpressPCB
free software for windows? I've got a small tabletop milling machine,
and have been asked to do a board that is about
On Sunday 25 October 2009, Peter Clifton wrote:
On Sun, 2009-10-25 at 13:04 -0400, Gene Heskett wrote:
And what is the pcb designers cli name?
Just pcb.
I think I have all of the geda suite installed, but there is not a pcb
designer in the electronics menu. Only gerbview, gshem and gattrib
On Tuesday 08 December 2009, Bob Paddock wrote:
As gEDA and DJ have been feathered in Circuit Cellar Magazine,
Feathered? I hope not with tar too. ;)
I thought I'd mention the news that Circuit Cellar Magazine being sold
to Elektor.
On Wednesday 17 February 2010, DJ Delorie wrote:
Some of you know I've been working with the local high school's FIRST
robotics team. Here's a status update:
http://www.youtube.com/watch?v=3_VfT5_mEn0
At 0:49 there's a photo of me teaching one of the freshman how to
assemble a circuit board
On Wednesday 17 February 2010, DJ Delorie wrote:
D.J.D.;
For those who don't know - DJ is my name, not my initials.
Oops, sorry. I didn't do that intentionally, I just assumed that the DJ was
for David James or some such. My apologies.
For instilling in these young folks, a sense of pride
On Friday 26 February 2010, Bob Paddock wrote:
On Fri, Feb 26, 2010 at 9:49 AM, Kai-Martin Knaak k...@familieknaak.de
wrote:
gedasymbols.org seems non responsive at the moment.
Any hint for a reason?
http://kdka.com/topstories/Northeast.snow.storm.2.1522070.html
Good luck with that Bob, I
On Wednesday 03 March 2010, Larry Doolittle wrote:
Al -
On Wed, Mar 03, 2010 at 10:18:59AM -0500, al davis wrote:
Along that line ... You could get what they call reading
glasses from a supermarket. Get the strongest ones they have.
They make great magnifying glasses.
I didn't need them in
On Monday 15 March 2010, John Griessen wrote:
Ales Hvezda wrote:
problem with for-pay servers is users are motivated, they help
pay for a few months, then no more
so any decisions that affect $$ need to account for probably
Ales paying for it out of pocket
I have
On Wednesday 31 March 2010, Peter TB Brett wrote:
On Wednesday 31 March 2010 17:06:14 John Griessen wrote:
Peter Clifton wrote:
On Tue, 2010-03-30 at 15:41 -0700, Dave N6NZ wrote:
I want to follow the git -- but for now on the release branch (if
there is one??) not the dev head.
Use the
On Wednesday 28 April 2010, Dave McGuire wrote:
On Apr 28, 2010, at 3:40 PM, John Doty wrote:
Well, you started out complaining about a 741 model. I'd call that
a very rare, obsolete part: I haven't actually seen one in a
circuit in over 30 years. I guess it's still in textbooks (read
Stephen
On Thursday 29 April 2010, Dave McGuire wrote:
On Apr 29, 2010, at 12:48 AM, Gene Heskett wrote:
Well, you started out complaining about a 741 model. I'd call that
a very rare, obsolete part: I haven't actually seen one in a
circuit in over 30 years. I guess it's still in textbooks (read
On Thursday 29 April 2010, Russell Shaw wrote:
Gene Heskett wrote:
On Wednesday 28 April 2010, Dave McGuire wrote:
On Apr 28, 2010, at 3:40 PM, John Doty wrote:
Well, you started out complaining about a 741 model. I'd call that
a very rare, obsolete part: I haven't actually seen one
On Thursday 29 April 2010, John Doty wrote:
On Apr 29, 2010, at 6:50 AM, Russell Shaw wrote:
Gene Heskett wrote:
On Wednesday 28 April 2010, Dave McGuire wrote:
On Apr 28, 2010, at 3:40 PM, John Doty wrote:
Well, you started out complaining about a 741 model. I'd call that
a very rare
On Thursday 06 May 2010, Dave McGuire wrote:
On May 6, 2010, at 5:30 PM, Felipe De la Puente Christen wrote:
Sometime ago I was thinking that gEDA-users as a comunity could
request
a part search API-like system to the distributors. For example,Digikey
already has a fast-search bar for firefox,
On Thursday 13 May 2010, timecop wrote:
Same as with the lights. Either from a dynamo, or from batteries charged
at home.
For bonus points, make it charge by induction while sitting inside the
seat pole.
An old Oral-B toothbrush, stripped and the coils re-adjusted, might be just
the ticket.
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