Perhaps this should be on the Mad Scientist list. I think it was the quantum state of a photon, not the actual photon that was "teleported". Although for all intents and purposes, I suppose that -is- the photon. Alien Steve --- In Electronics_101@..., srinivas rao <ksrao_iete@y...> wrote: hi all
wanna discuss something very Seriously
Teleportation.... yah.....
it is the king of technology in the nearby future where people will be transmitted from one place to another within a fraction of seconds. already the researches are going on and at IBM researchers have researched this technology and found some success on teleporting the photons of light successfully.
looking at the future where we can compete the unknown aliens (beleived to be present)
looking to be so hi-fi and lot of sci-fi
trying to compare the replies
bye
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hi all
?
wanna discuss something very Seriously
?
Teleportation....? yah.....
?
?
it is the king of technology in the nearby future where people will be transmitted from one place to another within a fraction of seconds. already the researches are going on and at IBM researchers have?researched this technology and found some success on teleporting the photons of light successfully.
?
looking at the future where we can compete the unknown aliens (beleived to be present)
?
looking to be so hi-fi and lot of sci-fi
?
trying to compare the replies
?
bye..
?
?
?
Do you Yahoo!?
Yahoo! Photos:
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Re: Sound card as digital Oscope
You can download free software for using your sound card as an
oscilloscope through my web page. The link for the electrical
engineering files is:
There you can download the file named: digital oscilloscope
I want to mentione that the software is not written by me but the
author of the program permits the free use of his program.
Also because the sound card has limits on the frequency that can
acquire don't expect the sample frequency to be large enough for
your requirements. But for a few KHertz sampling is great.
Thank You,
Lucas.
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I am trying to desing a power supply, including a 12v flyback regulator
(it's for my incar mp3 player).
The regulator I have is a national LM2587, there are designs in the app
notes but all include a transformer. As I think I'll need more than one
regulator (for more current) I'd prefer not to. Is it possible to built
one with an inductor?
--
Anthony Toft <toftat@...>
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In a message dated 4/22/2004 11:02:17 PM Central Standard Time, ksrao_iete@... writes:
wanna discuss something very Seriously Teleportation....? yah.....
?
Did someone say "substance-abuse"???
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Re: increase cable strength
with out any details its very hard to say but why dont you just try it with the longer cable. 8 extra inches isn't going to make much of a difference unless its a really tiny gauge wire and even then you could go to a bigger gauge. We're talking V drop in low mVs if not uVs. people often spec things *very* conservatively. assuming its logic and you absolutely need buffers, just about any buffer would do the trick. I'd look at CMOS since it can drive closer to the rails - 74HC series would probably be ok. --- In Electronics_101@..., "sd7008us" <sd7008us@y...> wrote: Hi all,
I have an application where I need to have longer cable, but the
chip that we are using only can drive 10cm cable length and I need
about 12 inches cable. Any idea what kind of buffers I need to drive the signals to the other side without losing data?
Thanks,
SD
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Re: increase cable strength
More details!
ST
p.s. WAY more details
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On Thu, 22 Apr 2004 18:21:20 -0000, sd7008us <sd7008us@...> wrote: Hi all,
I have an application where I need to have longer cable, but the
chip that we are using only can drive 10cm cable length and I need
about 12 inches cable. Any idea what kind of buffers I need to drive
the signals to the other side without losing data?
Thanks,
SD
Yahoo! Groups Links
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Hi all,
I have an application where I need to have longer cable, but the
chip that we are using only can drive 10cm cable length and I need
about 12 inches cable. Any idea what kind of buffers I need to drive
the signals to the other side without losing data?
Thanks,
SD
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On Wednesday 21 April 2004 05:33 pm, Steve wrote: Doh! forgot to change the subject line the first time... Doesn't matter, I read 'em all anyway! If it gets to the point where there are more that aren't of interest than are, I unsubscribe...
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Re: Sound card as digital Oscope
On Wednesday 21 April 2004 05:32 pm, Steve wrote: You can do all the same things with it that you can with coax.
Matching impedances, mixers, resonant stubs, couplers, etc. This sounds like it's getting into RF, that "voodoo" area of electronics that I tend, for the most part, to stay away from... :-)
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See Appcad in the links section.
Keith.
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Doh! forgot to change the subject line the first time...
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--- In Electronics_101@..., "Roy J. Tellason" <rtellason@b...> wrote: Alien Steve said: Microstripline so impedances match in circuit. Heard of that stuff, never saw any (that I know of) or worked with
it. What can you tell me about it? Google is your friend. So is the Links section, I had previously posted a lot of links on Microstripline, mostly impedance calculators. Basically a trace on a board with a groundplane on back acts as a transmission line. The impedance varies inversely with the width of the trace. A stripline transmission line is when it is in the center, enclosed by ground planes on top and bottom. A microstripline is when it is just a double-sided board with ground on one side, copper strip on other open to the air on top. You can do all the same things with it that you can with coax. Matching impedances, mixers, resonant stubs, couplers, etc. Alien Steve
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Re: Sound card as digital Oscope
--- In Electronics_101@..., "Roy J. Tellason" <rtellason@b...> wrote: Alien Steve said: Microstripline so impedances match in circuit. Heard of that stuff, never saw any (that I know of) or worked with
it. What can you tell me about it? Google is your friend. So is the Links section, I had previously posted a lot of links on Microstripline, mostly impedance calculators. Basically a trace on a board with a groundplane on back acts as a transmission line. The impedance varies inversely with the width of the trace. A stripline transmission line is when it is in the center, enclosed by ground planes on top and bottom. A microstripline is when it is just a double-sided board with ground on one side, copper strip on other open to the air on top. You can do all the same things with it that you can with coax. Matching impedances, mixers, resonant stubs, couplers, etc. Alien Steve
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Re: home-made signal generator question
--- In Electronics_101@..., "Murat Ceylan" <hector@g...> wrote: Hello Everyone,
I'd like to build a signal generator that is not too professional but good enough for general use i.e. that can produce sine, sawtooth and square waveforms in 1-50kHz range or so with reasonable reliability. Do you happen to have any schematics, suggestions, assembly tips etc.? Neatest way is to use a software DDS: Leon
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--- In Electronics_101@..., "dangermouse" <dangermouse1956@g...> wrote: ----- Original Message -----
From: "Keith" <keith@k...>
To: <Electronics_101@...>
Sent: Wednesday, April 21, 2004 11:14 AM
Subject: [Electronics_101] Re: signal oscillation
The
dominant noise component is usually the feedback resistor. Reducing
this by a factor if 10 will only reduce the noise by a factor of
sqrt(10) so you are roughly 3 times worse off for signal to noise
ratio. Reduce it by 100 and you are 10 times worse off. There is
also opamp current and voltage noise to consider.
Keith. What if you also reduce the input resistor by the same proportion, so as to keep the stage gain the same? Would the s/n ratio not improve?
-DM If it is a current to voltage converter (transimpedance amplifier) there is no input resistor. The "transimpedance" is simply the feedback resistor value. A capacitor across the feedback resistor can help, but quickly kills the frequency response. Keith.
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----- Original Message ----- From: "Keith" <keith@...> To: <Electronics_101@...> Sent: Wednesday, April 21, 2004 11:14 AM Subject: [Electronics_101] Re: signal oscillation The
dominant noise component is usually the feedback resistor. Reducing
this by a factor if 10 will only reduce the noise by a factor of
sqrt(10) so you are roughly 3 times worse off for signal to noise
ratio. Reduce it by 100 and you are 10 times worse off. There is
also opamp current and voltage noise to consider.
Keith. What if you also reduce the input resistor by the same proportion, so as to keep the stage gain the same? Would the s/n ratio not improve? -DM
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--- In Electronics_101@..., "ktauyeung" <ktauyeung@y...> wrote: I am working on a high-gain current-to-voltage amplifier. I need to
convert a very low pulsed current signal (100 microsec, <nanoamp)
into a voltage signal (>10 mV) that I can read from the scope. I
tried the amplifier using a low-gain (0.2 V/microamp) setting, and it
works ok. When I tried it with a higher gain (2 V/microamp),
oscillations (~10 microsec, regular amplitude) showed up on the scope
display. I'd like to fix that, but don't know how. I need some help,
if you know how to fix it and what is the cause of that, please let
me know. Thanks! Is the current source a photodiode? If so, that is probably the cause of the oscillations. If you have access to a Spice simulator you could quickly check it. What opamp are you using? 2M ohms is NOT a large resistor for such an amplifier. They can easily be 10M or 100M. If you use two stages you could be dogged by noise problems. The dominant noise component is usually the feedback resistor. Reducing this by a factor if 10 will only reduce the noise by a factor of sqrt(10) so you are roughly 3 times worse off for signal to noise ratio. Reduce it by 100 and you are 10 times worse off. There is also opamp current and voltage noise to consider. Keith.
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Here are the answers to the quiz that I posted yesterday.
1) b
2) c
3) a
4) d
5) e
6) b
7) b
8) b
9) a
10) c
11) a
12) c
13) c
14) b
15) b
16) a
17) a
18) b
19) c
20) a
21) a
22) 4
23) c
24) a
25) c
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Re: Triac instead of relay ?
power meters work. The one we have here now is like that. The one where we used to live was
electronic, sort of. The display, instead of being the usual mechanical
stuff, was a small LCD panel which would sequence through a number of
different things, cumulative and otherwise. That gave that particular power
company the ability to nail us for more money during "peak" hours vs.
"off-peak" hours and similar nonsense. I wasn't real happy about that.
same here, the new generation is digital with a lcd display. They say the advantage is that they can do a remote readout if they want so they no longer have to send one to read it. In reality most people alerady do their own reading and send the result in via mail or phone or www. they only do spot tests to avoid cheating. I bet the new meter gives them some means of charging us more.... It has also a voltage and current multiplying unit, it would not be fair to disregard the voltage. it can vary from say 240 to 220 V, or at least 240 to 230V which are a few % less energy you get out witht the same amps. ST
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I read that 100 microseconds was the update time and that it was a
current-to-voltage converter where 1 microamp converted to 2 volts. Using
a typical op-amp setup, this would require a 2M ohm resistor. Take the
inverse of 2*pi*10kHz*2M and you get the approximate value of capacitance
where the closed loop gain will be reduced to unity (did I remember that
right?). I picked a smaller resistor value to allow the full bandwidth (I
didn't want to approach the 3dB point).
I assumed the current was being fed into the inverting input to an op-amp
and the feedback resistor was converting the current into a voltage.
Best,
Scotty
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[Original Message]
From: Stefan Trethan <stefan_trethan@...>
To: <Electronics_101@...>
Date: 4/20/2004 1:36:16 AM
Subject: Re: [Electronics_101] signal oscillation
On Mon, 19 Apr 2004 16:27:27 -0700, Scott Thompson
<electronguy@...> wrote:
The high-valued feedback resistor is perhaps causing a lot of phase
shift because of the feedback capacitance, etc.
Try a 6.8 pF capacitor across your 2M feedback resistor.
Best,
Scotty
Where do you see a schematic or know the value of the feedback resistor?
2M feedback is really high, try to stay between 1k and 100k.
maybe lower if you don't load the output with it (e.g. noninverting amp
the resistor
from inv to ground)
Or use two stages if you can't fit that much gain in one.
ST
Yahoo! Groups Links
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Steven AE7HD