Driver to drive?

[Chris Carlen]

Frank Bemelman wrote:

What a beautiful country where people *fear* being sent to prison for
shipping a handful of tubes of Atmega8515.

Imported, of course.


--
_______________________________________________________________________
Christopher R. Carlen
Principal Laser/Optical Technologist
Sandia National Laboratories CA USA
crcarle@sandia.gov -- NOTE: Remove "BOGUS" from email address to reply.

 

[Active8]

On Mon, 29 Nov 2004 14:23:46 -0800, John Larkin wrote:

The real fear, in theory, is of being nuked. We can't, for example,
ship anything that will put 5 volts or more into 50 ohms in under 1
ns, without checking for an allowed destination and end-use. That made
a little sense 20 years ago, but a 20 cent TinyLogic gate will do it
with ease nowadays.

Some guys I sometime work with messed up a couple of years ago, and
shipped a NIM module to the wrong party in India. They were raided by
big guys in flak jackets with automatic weapons, arrested, and
criminally indicted. They wound up not doing time, eventually, but the
fines and legal fees easily exceeded $500K.

Near Philly, an Isreali company, Quality FR (goes by some magnetics

related name out west) got fined around $600k for selling dual use
technology to China. They make antenna test equip.

.... and they program in MFC, so they suck.

--
Best Regards,
Mike

 

[John Larkin]

On Mon, 29 Nov 2004 18:10:00 -0500, Active8 <reply2group@ndbbm.net>
wrote:

... and they program in MFC, so they suck.

Right. They deserved it. Snared in the .NET of the law.

John

 

[legg]

It is indeed to reduce galvanic corrosion in all hardware contacting
ground. In most cases, this will include chassis and grounding
hardware - those components which by-and-large inevitably make this
contact.

This is stated emphatically in NEBS GR1089 sect 72 and 73.

It is also a control method used, along with other types of cathodic
protection, in marine, civil and large industrial installations. The
intention is to polarize metalic structural hardware with respect to
its immediate environment, be it concrete, dirt, salt water or even
some kinds of air.

RL

 

[Active8]

On Mon, 29 Nov 2004 15:26:28 -0800, John Larkin wrote:

On Mon, 29 Nov 2004 18:10:00 -0500, Active8 <reply2group@ndbbm.net
wrote:

... and they program in MFC, so they suck.

Right. They deserved it. Snared in the .NET of the law.

<grin> good one!
--
Best Regards,
Mike

 

[Terry Given]

Scott Miller wrote:

Shunts are inefficient because they regulate by 'burning off' the excess.
I'd just use it just as a feedback. How to do that with a TLV431 is
explained in a TI app note about isolated flyback converters. I forgot the
number but you should be able to find it.


I'll take a look.


minimum 'cathode' current of 100uA. Since your application appears not to
be an isolated one this feedback circuitry will become much simpler than
in the TI note.


Isn't it? It's using a transformer with isolated windings. Doesn't that
make it an isolated flyback converter? Or does that not count because it
feeds back into the +9v rail through the shunt?

Scott

Its not isolated because the primary and secondary circuits share a
common "ground"

Cheers
Terry

 

[Terry Given]

Scott Miller wrote:

That shunt would drain your battery rather quickly. Q1 keeps pumping in
energy and the varistors just burn that off. Also, please note that the
metal oxide variety has a finite lifetime. They are like a bank account,
after so many joules they go kaputt.


Indeed it does... draws about 40 or 50 ma, with < 10 of that being the MCU
and display. Didn't know that about MOVs - one more reason to find another
design.

little dutch timebomb, tick-tock-boom.

Thanks,

Scott

Cheers
Terry

 

[Pooh Bear]

Rich Grise wrote:

On Mon, 29 Nov 2004 16:49:08 +0100, Frank Bemelman wrote:

...
I am not going to comply with any further spanish inquisition.

Best regards,
Frank Bemelman

Uh-oh! Looks like you got on somebody's list! I'd start watching my back.
Maybe put up a picture of Our Beloved Leader in your office or something

You mean *your* beloved leader I suspect. Beloved by half of the population
at least.

You'd surely get lynched for that in the Netherlands ?

- you know, look loyal.

Loyal to whom or what ?

I think the Dutch Royal family are pretty cool actually.
http://www.koninklijkhuis.nl/UK/welcome.html

Graham

 

[Robert Baer]

Winfield Hill wrote:

Robert Baer wrote...

A temperature compensated 500V zener would be far better...

Given the device physics, that would have to be made from 89
5.6V zener dies in series. :&gt (If a zener reference was
desired, it would make more sense to attenuate the HV down
to 5.6V, compare and regulate.)

--
Thanks,
- Win

I use a dual 8V unit giving 17V after (some) TC.

 

[Paul Burke]

Terry Given wrote:

They seemed to accept my "crippled, deformed and retarded people" for my
target market. Next time I might try "stupid paranoid people" or perhaps
"lesbian amputees". Sex toys of course make for great product
descriptions, as does anything medical - colostomy bag sterilisers anyone?

Apart from your choice being a wee bit less than PC, that's a wonderful
idea. I know that many years ago when I'd pulled a sickie, I signed off
the self- certification saying I'd been suffering from hyperdulia. No
one in the office was interested enough to look it up in the dictionary,
so I got away with it.

Paul Burke

 

[Arie de Muynck]

Ken Smith" ....

Is this what we are dealing with here:
...
If so, how does the [triac] get turned off with a current flowing in the
load?

No. It is:

----------------------------------------
^ | |
! ) /
! ) L (load) \ R
! ) /
Mains | \
! ----- |
! A V Triac |
! ----- ___
! Trigger ckt----/ | ___ C
V | |
----------------------------------------

The triac turns off at the zerocrossing of the current through it. Since the
mains voltage will be about maximum then, the snubber limits the slewrate,
preventing the turnon by excessive dV/dt.
The resistor provides damping of the turnoff efect. It also limits the
current when the triac fires at turnon:
I(pk) = Vmains(pk) / R
and this discussion is about how a 2W 47 Ohm resistor likes that hefty
spike...

Regards,
Arie de Muynck

 

[Rheilly Phoull]

"Rich Grise" <rich@example.net> wrote in message
newsan.2004.11.28.10.10.52.85429@example.net...

So, it's 2:48 AM, thankfully I had the foresight to get a bottle of vodka
to see me through the night, but I'm all out of plausible mix, it's too
late to brew a pot of coffee, and I'm in no condition to go to the store
for soda pop, and the only sweets I have to improvise (just plain water
is, well, come on now!) with is brown sugar. So, I put about a tablespoon
of brown sugar in my glass, fill it up except for a finger or two of room
for vodka, which I promptly plenish, stir well, because, after all, brown
sugar, even though it's brown, is still sugar, and so, if you stir long
enough, it _will_ dissolve, right?

So, anyway, I've got this glass of mildly brownish water/vodka mix, which
I'm anticipating is going to be rather tasty, actually, because I rather
like the taste of brown sugar, and, more intensely, molasses. When I was a
kid, I used to climb up on the cupboard and sneak a spoonful of molasses.
Maybe this is weird.

Anyway, to the point: I've got this lovely experimental drink in front of
me, which isn't all that risky of an experiment, since I know I like the
taste of brown sugar, and I know that I like vodka, I take a nice
welcoming swig, and -

Lo and behold!

Root Beer!

Except "still" <see other thread ;-) > and, somehow, very deeply
satisfying.

;^j
Rich

Geez Rich !!

Your such a lonely fucker

--
Regards ..... Rheilly Phoull

 

[Tony Williams]

In article <j9loq0tjvhmskivth5hc4pgs71u7ibqs4t@4ax.com>,
Terry Pinnell <terrypinDELETE@THESEdial.pipex.com> wrote:

Thanks Tony. 3 down, 7 to go. Until my next 10 <g>.

I forgot to say. After the schematic is drawn, and
before a run, you can wander the cursor around the
schematic and the identity of each node also comes
up in the bottom left corner.

--
Tony Williams.

 

[YD]

On Tue, 30 Nov 2004 13:48:36 +0000 (GMT), Tony Williams
<tonyw@ledelec.demon.co.uk> wrote:

In article <j9loq0tjvhmskivth5hc4pgs71u7ibqs4t@4ax.com>,
Terry Pinnell <terrypinDELETE@THESEdial.pipex.com> wrote:

Thanks Tony. 3 down, 7 to go. Until my next 10 <g>.

I forgot to say. After the schematic is drawn, and
before a run, you can wander the cursor around the
schematic and the identity of each node also comes
up in the bottom left corner.

You can also place a label (F4) at the nodes of interest. Press F4 to
give it a name and definiton (In, Out, Bi, None). Then drag and drop
it onto a wire in the node. Or place it somewhere and connect it.

- YD.

--
Remove HAT if replying by mail.

 

[Terry Pinnell]

YD <yd.techHAT@techie.com> wrote:

On Tue, 30 Nov 2004 13:48:36 +0000 (GMT), Tony Williams
tonyw@ledelec.demon.co.uk> wrote:

In article <j9loq0tjvhmskivth5hc4pgs71u7ibqs4t@4ax.com>,
Terry Pinnell <terrypinDELETE@THESEdial.pipex.com> wrote:

Thanks Tony. 3 down, 7 to go. Until my next 10 <g>.

I forgot to say. After the schematic is drawn, and
before a run, you can wander the cursor around the
schematic and the identity of each node also comes
up in the bottom left corner.

You can also place a label (F4) at the nodes of interest. Press F4 to
give it a name and definiton (In, Out, Bi, None). Then drag and drop
it onto a wire in the node. Or place it somewhere and connect it.

- YD.

Thanks YD. Discovered that one a little later <g>. How about
connecting the .IC command though?

--
Terry Pinnell
Hobbyist, West Sussex, UK

 

[Chris Carlen]

John Larkin wrote:

Sounds like powdered iron junk. If you want to stick with a torroid,
use the Magnetics, Inc "Kool-Mu" material. It's almost as good as
permalloy powder, but a lot cheaper. I think Micrometals has an
equivalent, now. I was burning paint off powdered-iron cores, and that
fixed it.

John

Yes, JW Miller says they are EMI. It says "DC-DC converter, EMI filter
applications" but then says "low core loss".

Oh well.

Thanks for the tip about Kool-Mu. I might like to use toroid, to avoid
alot of fringing fields from my spacer-gapped cores wandering about my
chassis, which will also have some more sensitive analog stuff.

But I might be able to test things with my ETD29-3C90 cores anyways...

Thanks for the input.


Good day!


--
_______________________________________________________________________
Christopher R. Carlen
Principal Laser/Optical Technologist
Sandia National Laboratories CA USA
crcarle@sandia.gov -- NOTE: Remove "BOGUS" from email address to reply.

 

[Chris Carlen]

Pooh Bear wrote:

Careful. Ferrites saturate rapidly. You might need an air gap.

Check out Epcos's Ferrite magnetic design tool ( downloadable from epcos.com
).

It does all the calculations for you. You want the DC bias tab btw.

Thanks for the link.


--
_______________________________________________________________________
Christopher R. Carlen
Principal Laser/Optical Technologist
Sandia National Laboratories CA USA
crcarle@sandia.gov -- NOTE: Remove "BOGUS" from email address to reply.

 

[Nicholas O. Lindan]

Can't think of any reason to want to
understand an obsolete part.

What's obsolete: IBM 360 c. 1963
Intel 8051 c. 1978
Intel 8x86 c. 1978
Motorola 68x c. 1979
PIC 16x5x c. 1990 (?)

It is obsolete only when it is not used anymore, not when
something zoomier comes on the market.

--
Nicholas O. Lindan, Cleveland, Ohio
Consulting Engineer: Electronics; Informatics; Photonics.
Remove spaces etc. to reply: n o lindan at net com dot com
psst.. want to buy an f-stop timer? nolindan.com/da/fstop/

 

[Anders F]

"Stratcat" <none@no.org> wrote in message
news:3YXqd.34815$Qv5.30111@newssvr33.news.prodigy.com...

Hi guys -

First time posting here.

I'm doing some PC overclocking & have been finding my cpu pwr FETs are
really sizzlin'! I don't have the equipment to get a temp reading, but
several ppl on an overclocking forum I'm a member of, have already lost
some
motherboards due to blowing a FET. We're overclocking 1st generation Intel
P4 Prescott cpu's, and they extremely power hungry. Some peeps have
resorted
to adding heat sinks to their FETs, with varying success.

Frankly I'd start there too! No need to over-engineer it, right?
Besides that: More info is needed...

/A

 

[Joel Kolstad]

"Chris Carlen" <crcarle@BOGUS.sandia.gov> wrote in message
news:coi3q501rk5@news3.newsguy.com...

JW Magnetics has confirmed they are for EMI.

What I've learned from your story here is that one shouldn't expect to use a
given inductor in an AC application unless the manufacturer gives you a
hysteresis loss curve!