Re: If you had one what would you use it for
- From: Joerg <invalid@xxxxxxxxxxxxxxx>
- Date: Wed, 21 Oct 2009 16:24:00 -0700
Jim Thompson wrote:
On Wed, 21 Oct 2009 16:04:45 -0700, Joerg <invalid@xxxxxxxxxxxxxxx>
wrote:
Jim Thompson wrote:On Wed, 21 Oct 2009 14:08:25 -0700, Joerg <invalid@xxxxxxxxxxxxxxx>Sometimes when in a ham radio contest and the plates of the notoriously under-dimensioned output side variable caps fused together I'd occasionally key the transmitter CW at full legal limit ... tunggg ... *PHOOMP* ... problem fixed, some ozone and weld shop smell wafting through the air.
wrote:
John Larkin wrote:In the early '70's I used to have pin hole problems with AluminaOn Wed, 21 Oct 2009 06:21:02 -0700 (PDT), MooseFETIf you crank up the DC current some more you can see the short without the FLIR camera. If you crank it up even more the short may fix itself but you'd have to open the windows for a while.
<kensmith@xxxxxxxxx> wrote:
Imagine you had a sensor that could measure very small magneticYou need high spatial resolution for a general-purpose board short
fields. It measures with a noise floor of about 0.1fT. Unfortunately
the band width is only a few hundred Hz and it only works inside a
shield.
What would you use such a sensor for? The best I've thought of is
detecting the flow of current in a PCB to find a short circuit.
finder. Magnetically, you can do it with a pulsed current source and a
really tiny ferrite-core pickup coil. I do it lately with a DC source
and a thermal imager, so you can *see* the current path.
substrates, the screened-on metalization would go thru a pin hole and
short a trace to ground plane on the back-side.
You take a 6V/100A power supply... "click" ;-)
Reminds of this morning, put the grandson on the school bus, breeze
was such that I could smell fumes from the exhaust... very much like
Clorox??? Anyone know diesels, and why/how such a smell?
IMHO sloppy design/fabrication. Domestic bus engine mfgs need a serious dose of education. I find it rather odd that states slap all sorts of extreme smog regs on cars while school buses can just keep belching out dirt. Probably the quality of Diesel in the US ain't that great either but that's no excuse, the Setra buses from Germany I've seen here didn't belch stuff and did not smell. They were huge tour buses and run on the same Diesel as the school buses. So it can be done.
I just finished an injector design (but for aerospace). Initially I was looking for dedicated chips. What I found was very archaic and some app note circuits almost made me sick. So I rolled my own, much better precision than the, ahem, "professional" solutions of the trade.
--
Regards, Joerg
http://www.analogconsultants.com/
"gmail" domain blocked because of excessive spam.
Use another domain or send PM.
.
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