Driver to drive?

[Robert Morein]

"John Woodgate" <jmw@jmwa.demon.contraspam.yuk> wrote in message
news:hWl9jmBi+kYBFw6F@jmwa.demon.co.uk...

I read in sci.electronics.design that Robert Morein
nowhere@nowhere.com> wrote (in <qe-dnRYnl8Blvv_cRVn-uA@comcast.com&gt
about 'Exploding lithiums??', on Tue, 5 Oct 2004:
I like to watch movies with my laptop in my lap.

You need to consider the actual temperature of the bottom of the laptop
case, which is far more likely to cause you discomfort than the much
less probable battery explosion.
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk

I've heard about the legal cases regarding "laptop burns", and I laugh.
The brains of the victims must be a little unusual. Most of us readily sense
if something is uncomfortably warm.
IMHO, only a small minority of the population can screen out dangerous
stimuli.

Personally, I have never encountered a laptop bottom that was more than
uncomfortably warm.
I have never experienced a laptop with temperature elevated to the point
that tissue damage could occur.
On the other hand, explosive rupture of a battery pack close to the abdomen
could, concievably, be lethal.

 

[John Woodgate]

I read in sci.electronics.design that john jardine
<john@jjdesigns.fsnet.co.uk> wrote (in <cjv3hi$87p$1@newsg4.svr.pol.co.u
k&gt about 'Marketing blurb - bullsh*t baffles etc', on Tue, 5 Oct 2004:

Golly, it aint arf fast!

Actually, you're lucky if it IS 'arf as fast as claimed. But it is, no
doubt, much faster than dial-up.
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk

 

[Julie]

Robert Morein wrote:

I've heard about the legal cases regarding "laptop burns", and I laugh.
The brains of the victims must be a little unusual. Most of us readily sense
if something is uncomfortably warm.

It isn't an immediate burn, but a burn as a consequence of extended heated
contact, not unlike a sunburn.

 

[Clarence]

"xray" <notreally@hotmail.invalid> wrote in message
news:90p6m01k67o1e4e2bgheo9hs3617fpggta@4ax.com...

On Wed, 06 Oct 2004 03:00:23 GMT, xray <notreally@hotmail.invalid
wrote:

If your considering moving, pack your bags.

Oh, and I forgot to criticize you're grammar.
--------------------------------^^^^^^--------

He-he!

 

[Clarence]

"xray" <notreally@hotmail.invalid> wrote in message
news:1kn6m0t1t4cogun8g8crpjdo9t5ahurg2o@4ax.com...


Nothing of value

 

[Clarence]

"budgie" <me@privacy.net> wrote in message
news:sjq6m0hj7mriscpa39tboc8ibhibf8k1d3@4ax.com...

On 5 Oct 2004 05:19:04 -0700, johankarremans@hotmail.com (Johan Karremans)
wrote:

Can somebody tell me what the substitute ic is from ic 74LS173.

74LS173 in stock at my local supplier here in Perth Oz at $A0.99. Why do you
think you need a substitute - if I can get them down the corner, I'd be
surprised
if they aren't available almost everywhere.

http://www.jdr.com/interact/item.asp?itemno=GR-74LSG2

$0.39 ea

 

[Arie de Muynck]

<ftls1@uaf.edu> ...

I have an oscilloscope in hands and I want to let it access to the
internet then I can "see and operate" it from distance (in an intranet
actually).BUT-this oscilloscope could obtain a dynamic IP address,
which is private IP address. This is the first step, next I must tell
this IP and MAC to the administrator to get a new IP address.
Here is the problem:
I must know the MAC or physical address because in my area the network
administrator only assigns IP address combined with MAC address.

1) Look it up on the sticker.

If it has been removed:

2) Install (free) ethereal, connect scope to PC with a single switch, hub or
crosscable, start ethereal, turnon scope. I expect the scope to send out at
least one packet, which will show the MAC address (and possibly it's current
IP address.

Regards,
Arie de muijnck

 

[Robert Morein]

"John Woodgate" <jmw@jmwa.demon.contraspam.yuk> wrote in message
news:mFfMHMBKz3YBFwq3@jmwa.demon.co.uk...

I read in sci.electronics.design that Robert Morein
nowhere@nowhere.com> wrote (in <o-GdnV8RLtFe6_7cRVn-rw@comcast.com&gt
about 'Exploding lithiums??', on Wed, 6 Oct 2004:

I've heard about the legal cases regarding "laptop burns", and I laugh.
The brains of the victims must be a little unusual. Most of us readily
sense if something is uncomfortably warm. IMHO, only a small minority of
the population can screen out dangerous stimuli.

AFAIK< the outcome of these incidents is still unknown. There may have
been faults.

Personally, I have never encountered a laptop bottom that was more than
uncomfortably warm. I have never experienced a laptop with temperature
elevated to the point that tissue damage could occur.

That's why I wrote 'discomfort'. my own laptop does get uncomfortably
warm, but it doesn't burn me.

On the other hand,
explosive rupture of a battery pack close to the abdomen could,
concievably, be lethal.

Yes, but the probability is probably lower than that of being fatally
kicked by a horse.
--
The two probabilities are not in the same universe of discourse because I

don't ride horses. OTOH, I am in close proximity with lithium packs.

 

[George W]

Mac wrote:

Well, if you want to directly sample VHF of 200 MHz, you need a 500 MHz
ADC, and a steep filter to block all the higher frequencies.

Or you could under sample, but then you'll still need a pretty fast
ADC with a bandpass filter in front.

I don't think you want to go down this path.

Sounds like you'd also need a preselector / BPF up front of the ADC to
allow just the wanted RF channel to get through? The BPF would have to
be down, say, 60 dB or so at 15 kHz away (the channel spacing) from the
wanted channel. Seems hard to do at 200 MHz.

George

 

[xray]

On Wed, 06 Oct 2004 05:12:05 GMT, "Clarence" <no@No.com> wrote:

"xray" <notreally@hotmail.invalid> wrote in message
news:90p6m01k67o1e4e2bgheo9hs3617fpggta@4ax.com...
On Wed, 06 Oct 2004 03:00:23 GMT, xray <notreally@hotmail.invalid
wrote:

If your considering moving, pack your bags.

Oh, and I forgot to criticize you're grammar.
--------------------------------^^^^^^--------

He-he!

Get a clue, idiot.

 

[xray]

On Wed, 06 Oct 2004 05:12:05 GMT, "Clarence" <no@No.com> wrote:

"xray" <notreally@hotmail.invalid> wrote in message
news:1kn6m0t1t4cogun8g8crpjdo9t5ahurg2o@4ax.com...


Nothing of value

Can't shut up even when you have nothing to say. Sad.

 

[Clarence]

"xray" <notreally@hotmail.invalid> wrote in message
news:c537m0l8ee91ot2ci4otsf6r0inqljkir7@4ax.com...

On Wed, 06 Oct 2004 05:12:05 GMT, "Clarence" <no@No.com> wrote:

"xray" <notreally@hotmail.invalid> wrote in message
news:1kn6m0t1t4cogun8g8crpjdo9t5ahurg2o@4ax.com...

Nothing of value

Can't shut up even when you have nothing to say. Sad.

You also have nothing of value to say, but 'you' don't know it.

 

[Clarence]

"xray" <notreally@hotmail.invalid> wrote in message
news:e137m0hf4gg6q8ve0f3lf6ub7rso7tipth@4ax.com...

On Wed, 06 Oct 2004 05:12:05 GMT, "Clarence" <no@No.com> wrote:


"xray" <notreally@hotmail.invalid> wrote in message
news:90p6m01k67o1e4e2bgheo9hs3617fpggta@4ax.com...
On Wed, 06 Oct 2004 03:00:23 GMT, xray <notreally@hotmail.invalid
wrote:

If your considering moving, pack your bags.

Oh, and I forgot to criticize you're grammar.
--------------------------------^^^^^^--------

He-he!


Get a clue, idiot.

I know you are an idiot, but you don't seem to appreciate that everyone knows
it.

 

[xray]

On Wed, 06 Oct 2004 06:30:00 GMT, "Clarence" <no@No.com> wrote:

"xray" <notreally@hotmail.invalid> wrote in message
news:e137m0hf4gg6q8ve0f3lf6ub7rso7tipth@4ax.com...
On Wed, 06 Oct 2004 05:12:05 GMT, "Clarence" <no@No.com> wrote:


"xray" <notreally@hotmail.invalid> wrote in message
news:90p6m01k67o1e4e2bgheo9hs3617fpggta@4ax.com...
On Wed, 06 Oct 2004 03:00:23 GMT, xray <notreally@hotmail.invalid
wrote:

If your considering moving, pack your bags.

Oh, and I forgot to criticize you're grammar.
--------------------------------^^^^^^--------

He-he!


Get a clue, idiot.


I know you are an idiot, but you don't seem to appreciate that everyone knows
it.

Nah na nahh na nahhh na nahh
Your mother wears combat boots.

Top that tweeb!

 

[Kevin Aylward]

Blue wrote:

I'm developing a new Bass Amplifier - evolving the existing.

The general idea is a great analog pre-amp (I have new one developed)

What's so "great" about it?

and mate it with a very high power, transparent, light, reliable
design (I need that). I think I can get a switching power supply to
work well.

I'm looking for a qualified "venture inventor" with time and talent to
take an existing MOSFET amp design - 250 watt @8 - and design a 750
watt amp. I the basic schematic, and think mosfets just get added in
parallel to multiply the power, and of course the power supply has to
be tripled too.

Unlikely. Your asking for 3 times the power into the same load
impedance, you will probably have to increase the voltage ratings of
most the components, specifically the output devices.

A fan is a given need.

I provide the case, preamp, switching power supply (I actualy need
help there too),

Ahmmm..

assembly, marketing, distribution, sales - and need
someone to do the power amp (Watts that you say?).

The best person will be someone who has done it before, and knows it's
a "simple" job using off-the-shelf parts, properly mated. This person
would ideally be very good electronically, with music as a hobby,
willing to work for peanuts on protoypes, to be paid long and slow as
the market is developed and units are sold - kind of a venture
inventor.

Any one interested?

The pro amplifier market is completely saturated. There is no way you
are are going to compete.

Your post tells me, with all due respect, that you are pretty much
clueless on this. Look dude, I am familiar with this stuff, your wasting
your time. Hint: I designed the equipment here
http://www.studiomaster.com/hp5.html

Kevin Aylward
salesEXTRACT@anasoft.co.uk
http://www.anasoft.co.uk
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.

 

[Kevin Aylward]

Yannick wrote:

However if you use a high performance low noise MOSFET in place of
the transistor, you can run it at a high curent to acheive very low
voltage noise and still curent noise wil be low, this may well add a
significant overal noise improvement to the TIA using the OPA series
of op amps.


Yes but i dont see how you exactly connect this mosfet(NMOS) between
the photodiode and the input of the TIA! do you connect the source at
the input and the drain at the anode of the photodiode? and the gate
at a voltage higher then VT ? (this would seem strange to me)

(i know there is no physical difference between source and drain and
depends on the way the current is flowing soo could be i got these 2
flipped)

Or do you connect the gate of the mos at the anode of the photodiode
and use this small voltage fluctuations to give a drain current wich
will flow through the transimpedance stage?

but how would this exactly decrease input noise?

I would consider using the lowest noise front end you can that
provides moderate gain, becuase i think noise is definatly the
limiting factor, and then clean up the response in subsequent
stages. If you have a very simple design for the front end its likly
to have one pole wich is easily
compensated for in a folowing circuit using say a high performance
curent feedback amplifier. the compensation might be more acurate
than trying to do it all inside one feedback loop. Multiple low gain
stages can provide very stable overall flat high frequency response
in many circuits especialy osciloscope input amps, trying to do it
al in one loop is chalenging even for the experts and is probably
going to be far less predictable than you would like.

It seems so but a composite or normal one stage TIA will give far
better Signal noise then opamps cascoded with there own feedback
because then all input errors (including opamp Noise) will add wich is
not the case if you use one stage...I dont really understand how you
can improve signal noise ratio with multiple stages

Its very difficult getting all specs satisfied in one stage. In many
case one can achieve better performance by splitting the work up into
more stages. The later stages are designed such that the don't effect
the performance of the input stage, that is errors do not simply add up.
For example, if the first stage has a voltage gain of only 10, then the
noise of the later stage (if equal) only adds 1% noise.

A reasonable way to design photo amps is to simply feed the signal
direct into a fet buffer, and let the signal roll off. Once the signal
is low impedance, it can be amplified, and frequency shaped to achieve a
net flat response. This keeps the number of active, noise generating
devices at the signal input minimised.


Kevin Aylward
salesEXTRACT@anasoft.co.uk
http://www.anasoft.co.uk
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.

 

[Tony Williams]

In article <cjvnt0$id3$1@blue.rahul.net>,
Ken Smith <kensmith@green.rahul.net> wrote:

I just designed in the 600V PTC circuit breaker from BC
components. You can guess what I just found out today. Thats
right, Vishay bought BC components and are cancelling that
product line.

Any chance of a replacement in the Raychem Polyswitch range?

--
Tony Williams.

 

[Rene Tschaggelar]

ftls1@uaf.edu wrote:

HI,All

I have an oscilloscope in hands and I want to let it access to the
internet then I can "see and operate" it from distance (in an intranet
actually).BUT-this oscilloscope could obtain a dynamic IP address,
which is private IP address. This is the first step, next I must tell
this IP and MAC to the administrator to get a new IP address.
Here is the problem:
I must know the MAC or physical address because in my area the network
administrator only assigns IP address combined with MAC address.

How can I solve it?

Buy the way , it's a Tektronix one with E-scope function.

Just in case it runs a windows user interface :

run "ipconfig /all" from the command prompt.

Rene
--
Ing.Buero R.Tschaggelar - http://www.ibrtses.com
& commercial newsgroups - http://www.talkto.net

 

[budgie]

On Wed, 06 Oct 2004 05:22:07 GMT, "Clarence" <no@No.com> wrote:

"budgie" <me@privacy.net> wrote in message
news:sjq6m0hj7mriscpa39tboc8ibhibf8k1d3@4ax.com...
On 5 Oct 2004 05:19:04 -0700, johankarremans@hotmail.com (Johan Karremans)
wrote:

Can somebody tell me what the substitute ic is from ic 74LS173.

74LS173 in stock at my local supplier here in Perth Oz at $A0.99. Why do you
think you need a substitute - if I can get them down the corner, I'd be
surprised
if they aren't available almost everywhere.

http://www.jdr.com/interact/item.asp?itemno=GR-74LSG2

$0.39 ea

which would be more than I pay ($A0.99) each by the time I get them into
Australia.

 

[Clarence]

"budgie" <me@privacy.net> wrote in message
news:a9d7m0tadjgl44bd4hnlb94vasvktsbp9q@4ax.com...

On Wed, 06 Oct 2004 05:22:07 GMT, "Clarence" <no@No.com> wrote:


"budgie" <me@privacy.net> wrote in message
news:sjq6m0hj7mriscpa39tboc8ibhibf8k1d3@4ax.com...
On 5 Oct 2004 05:19:04 -0700, johankarremans@hotmail.com (Johan Karremans)
wrote:

Can somebody tell me what the substitute ic is from ic 74LS173.

74LS173 in stock at my local supplier here in Perth Oz at $A0.99. Why do
you
think you need a substitute - if I can get them down the corner, I'd be
surprised
if they aren't available almost everywhere.

http://www.jdr.com/interact/item.asp?itemno=GR-74LSG2

$0.39 ea

which would be more than I pay ($A0.99) each by the time I get them into
Australia.

$0.39 USD is about $A0.56 However, are you only going to buy one?
Sorry, I never buy less than a tube (abt 25) So I wouldn't even consider one.