John Fields isn't spectacularly clever, but he's nowhere near as dumb as krw, and he's certainly not AlwaysWrong, as anybody only a trifle brighter than krw would be aware.
The name AlwaysWrong has been attached to somebody who posts under a variety of pseudonyms, and "John Fields' isn't any of them.
d
There's certainly that kind of stuff in the literature. I don't know how tightly they've coupled lead in electronic solder to intellectual development difficulties in kids, but the connection to lead in the environment (and in the kids) is solid.
You would. It's not a preference you'd want to advertise.
Good Lord, you're stupid! Read, why don't you? Then take a few minutes to understand. *I* don't ship products to Europe, though my company does - and manufactures there. *I* design and debug prototypes (platforms used for future products). RoHS doesn't mean s*it to our lab. We use RoHS processes for boards because it's hard to find anyone who doesn't do RoHS anymore, even harder to find leaded parts, and we use the same parts that the eventual product will use, anyway. Got it, dummy?
I sure don't. ;-)
re
Naturally, but nothing with a time constant long enough to pass a 30nS square pulse.
Fred had a good idea--test the transformer out-of-circuit.
I'm looking forward to Mook telling us the solution to his puzzle.
So, no? Not even the electronics part specifically is really necessary, but the landfill part would be good to know. Most electronics goes into landfills (or is disposed of overseas) anyway, so it would be a straightforward link to draw between leaded electronics and landfills. Plus there's a lot of other rather nasty s*it in those piles that would be unattractive at best to be drinking, beyond just lead.
Now... that "overseas" part is interesting, because most 3rd world people just burn the s*it to get at the copper, releasing all manner of awful chloro-bromo-fluoro-trans-cadaveroxyl-horribleinates which they aren't even wearing masks for, not that a mere dust mask would even help that much. Again, lead isn't as much of a hazard from inhalation, maybe the dust -- but the burn piles will retain a whole lot of it, and that's not very good for the people or the land. So give or take the disposal method (open or closed, overseas or recycled, etc.), it would be environmentally and morally responsible to use less toxic / more burnable/disposable materials, in general.
When I signed the lease to this [old-ish, '50s era I believe] apartment, I had to sign a disclaimer acknowledging it contains leaded paint. It's definitely a good thing to be aware of. My neighbor has a little girl, be a shame if she started eating paint chips. Every so often I hear violin sounds from across the hall, which has the characteristic waver of an inexperienced player, but given she's probably 8 or so, I'd guess she's doing very well.
Tim
wrong way.
But then he'd see an almost dead short on his +5V rail because the body diode shunts it to GND.
God, you're unbearable. You didn't move to Sydney by choice, I bet they deported you! Most likely couldn't afford any more brain dead geezers sucking on the funds.
Jamie
On a sunny day (Wed, 07 Nov 2012 17:20:27 -0800) it happened Joerg wrote in :
the wrong way.
Trace impedance :-) Does that thing have a body diode?
Then why are you bearing him? Go away.
the wrong way.
All FETs have body diodes, it is an intrinsic part of the respective semiconductor production process. The body diodes are, from a current carrying capability, similar to the FET itself except that you have to watch dissipation if you plan on using the body diode (I often do).
On a sunny day (Thu, 08 Nov 2012 10:39:01 -0800) it happened Joerg wrote in :
the wrong way.
I presume you mean power MOSFETS? J-FETs do not.
the wrong way.
All power MOSFETs (AFAIK) have body diodes, but I think mostly RF FETs* don't and certainly JFETs don't.
Although free, the body diode is often a PITA since it has sluggish recovery and has high voltage drop so we often parallel it with a good diode, such as a Schottky. "FETKY" products combine the two in one package. The diode tends also to do bad things if power connections are reversed, often requiring some extra thought and/or protection.
*Eg. BSS83, which has a separate substrate connection. Not sure about the dual-gate RF MOSFETs.. I think they do not as well.
the wrong way.
I wish someone made a back-to-back (or belly-to-belly, depending on your "orientation") device, to make a true isolating switch, as in...
or
You, of all people, should have some idea of the fab challenges involved in developing this as an integrated structure...
RL
in the wrong way.
Something like this?
:
erkins
eT is in the wrong way.
ody
like this?
but I don't see much of a need, there are plenty of dual fet in so8 and smaller available
-Lasse
the wrong way.
Any MOSFET does. The 2N7002 that the OP used are MOSFETs.
the wrong way.
A Schottky is a problem because it must be huge. One trick I sometimes use is to make sure the FET comes back on when the body diode wants to conduct but lets go when the current approaches zero. Can be a white-knuckle ride though, must be done with care. If someone built a very fast deive for that they could make lots of money. The usual ones are sluggish, one would need 10nsec, 20nsec max.
The SD5400 has that as well. A marvelous chip because it's a monolothic array of four. And, unlike crude oil, its price has come back down to about where it was in the 90's,
Have something to add? Share your thoughts — no account required.
Ask the community — no account required