sci.electronics.design Google Group

Re: Op-Amp Help Please

rabbitsfriendsandrelati...@hotmail.com (Eeyore) — Fri, 21 Nov 2008 11:41:14 UT

Won't go to 0V. Plus funny shit happens with large input common mode (forget which
polarity) like the output inverts.
Graham

Re: Electronic shutter?

ja...@xnet.co.nz (Jasen Betts) — Fri, 21 Nov 2008 10:34:51 UT

Try 'Shutterglasses' for computer 3d
should be able to get something for <$100
[link]
but seriously just use a smaller disc, you should be able to run a
disc for a few hours of a pair of AA cells.
OTOH have you tried a directional microphone :)

Re: Tärylätkä eli maantiivistäjä

turo.hofm...@therese.de (Turo Hofmann) — Fri, 21 Nov 2008 10:07:33 UT

*On suorastaan mielenkintoista huomata muuten miten juuri SUPO:n
poliisivaltuuksia, nettivakoilua, puhelinsalaisuuksia ja urkintalupia yhän
laajemmin erityisesti Holmlundin toimesta lisätään ydinhallinnollemma
merittäin.. .Mutta, mutta???
*Koskaan ei sen tarkemmin sanota MITEN tätä urkintaa ihan OIKEASTI

Re: Who's Got the Brightest LED? November 19, 2008

m...@invalid (Mike V) — Fri, 21 Nov 2008 09:16:25 UT

On Thu, 20 Nov 2008 21:21:26 -0800, Robert Baer
The board is basically 1.5mm thick aluminium with a thin fibreglass
insulator and a copper layer. The aluminium is to get the heat away
from the leds. For my design I need 4000 lumens, 30 leds per pcb
which is a lot of heat in a small area.
[link]

Re: relays

nos...@aol.com (Dr. Polemic) — Fri, 21 Nov 2008 07:46:02 UT

On Thu, 20 Nov 2008 14:16:27 -0800, John Larkin
Just one example: in another post you said, (cut and paste from the post):
"But that water will come out forever, with no further effort exerted
on the valve. The longer you wait, the more output power, without
limit. The output power is the *integral* of the input power.

Re: Electronic shutter?

jaibudu...@gmail.com (Le Chaud Lapin) — Fri, 21 Nov 2008 07:44:51 UT

I see.
What would happen if you could achieve the same effect of the slit by
momentarily blinding the observer with (annoying) low-intensity LED
projecting its pulses onto a semi-transparent mirror through which
observer observes helicopter?
[Incidentally, a few months ago, I developed an unhealthy obssession

Re: OT: Play regular MPEG on a DVD Player?

f...@frank-buss.de (Frank Buss) — Fri, 21 Nov 2008 07:34:21 UT

At least the region problem can be solved. You can try Google:
[link]
But try it with a browser in a virtual machine, some webpages of the result
might be dangerous.

Re: Religious people have superior visual perception than atheists

myrealaddr...@comic.com (D from BC) — Fri, 21 Nov 2008 07:25:24 UT

On Thu, 20 Nov 2008 22:16:01 -0800 (PST), "David L. Jones"
Nope.. Just a big bang..
To please the electron god, it must be a high energy event.
The ceremony involves a couple of drops of gasoline on the transistor
and then blowing it up with a high voltage/high current source.
(Extension cord with wall plug.)

Re: Electronic shutter?

philalli...@tpg.com.au (Phil Allison) — Fri, 21 Nov 2008 07:23:20 UT

"Robert Roland"
** Tiny DC motors exist the draw only minute amounts of current and quick
response to speed control inputs is only matter of using PWM drive with
air-load braking to the motor via the slotted disk.
IOW - the shortcomings you see are only the result of poor ( likely
amateur) design.

Re: I think I'm going to be sick...

quiettechb...@yahoo.com (JosephKK) — Fri, 21 Nov 2008 07:21:32 UT

On Wed, 19 Nov 2008 19:48:44 -0800 (PST), MooseFET
And exactly why do you prefer some blogger with made up data to
respected data sources? Moreover in your very own sources F&F have a
good chunk of funky loans, mostly bought and resold as securtized
investments with a patina of government investment guarantees.

Re: Op-Amp Help Please

bogusabd...@verizon.net (James Arthur) — Fri, 21 Nov 2008 06:34:12 UT

Well I knew you'd say that, of course, what with the CYA
in your line of work. I admit to using JFET-input op-amps
a tad 'over-the-top' way back when, maybe even the TL082.
Or maybe the LF442.
Not for serious work, but, with due checking, I wouldn't
rule that out either.
Cheers,
James Arthur

Re: Low Voltage Cutout

eh...@nospamverizon.net (ehsjr) — Fri, 21 Nov 2008 06:33:49 UT

If it is a 12V battery, 9V is too low. You want to disconnect
the battery at somewhere between 10.5 and 11 volts - higher
is better for the battery.
To prevent the "bounce syndrome", hold the relay energized
through its own open point. Something like this:
N/O Relay
Contact

Re: Religious people have superior visual perception than atheists

altz...@gmail.com (David L. Jones) — Fri, 21 Nov 2008 06:16:01 UT

Was there incense like smoke?
Dave.

Re: Op-Amp Help Please

nimby_gimme_some_s...@roadrunner.com (BobW) — Fri, 21 Nov 2008 06:06:08 UT

You didn't read the entire solution. Do the math and/or some simulation and
you'll see that you get very close to what you want with simple resistor
changes.
If you really want help from people you'd be better served by losing that
huffy attitude.
Bob

Re: Log-Periodic Antenna Design

salmone...@food.poisoning.org (Sal M. Onella) — Fri, 21 Nov 2008 05:59:02 UT

< snip >
It doesn't.
I have two converter boxes, one Magnavox, one Zenith. I just now tried my
local stations with them using a straight 24-inch alligator clip lead as the
antenna. Location is a residential garage in the San Diego suburbs. Stucco
walls, metal garage door closed, overhead fluorescent lights on.