audio recording on IC -help wanted

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[Albert Manfredi]

"Lostgallifreyan" <no-one@nowhere.net> wrote:

Most times light is used, heat is also wanted.

I suppose that depends where you live. In many parts of the populated
world, heating and cooling seasons are roughly even in length.

Also, even in heating seasons, the heat generated by light bulbs is not
necessarily efficiently generated or distributed. Resistive heating is
hardly the most efficient way to heat your home or office.

Where
it isn't, you use a light source that doesn't add heat, and there are
several choices. LED's in outdoor and tunnel and other places where
people
don't need to spend time keeping warm, or any of the other types
already in
use, but that's not where people spend most of their time.

LEDs will become a good option. From what I've read so far, their
efficiency will be very similar to that of fluorescents, both requiring
a little more than 1/5 as much energy as incandescent bulbs, for a given
lumens level.

The current availability of CFL's is no excuse to risk vast pollution
and
ebergy use in manufacture for all the general domestic uses that also
need
heat, and this is true before you begin to consider all the dimmers
that
must be replaced and thrown away.

I agree with this. The disposal of these things will create a pollution
problem. One mitigating factor is that one of these will last many years
as opposed to months, in normal use. But the disposal problem is
definitely an issue, and it also applies to hybrid cars or all-electric
cars.

You try to fix one problem and risk creating an even bigger one.

Bert

 

[hihihi]

hihihi wrote:

How about this heat method :
Put a 220 volt lightbulb of X watt in series with the primary side of the
trafo.
To prevent high short circuit current, in case of disaster.
Then put a load on the secondary side.

How about this :

Put no load on the secondary side.
Short circuit the secondary side with a ampere meter, to monitor the
secondary current.
And then adjust the wattage of the lightbulb in series with the primary
side, to get the maximum secondary current.

Trafo A is secondary 28.7 volt 3 ampere.
220/28.7=7.66
3/7.66= 0.391 ampere primary side.
220 x 0.391 = 86 watt lightbulb in series with primary side ????
In the real world this would be a 75 watt lightbulb ?

Trafo B is 34.6 volt 3 ampere.
220 / 34.6 = 6.358
3 / 6.358 = 0.471 ampere primary side.
220 x 0.471 = 103 watt lightbulb in series with primary side ?
In the real world this would be a 100 watt lightbulb ?

Trafo C is 22.2 volt 4 ampere
220 / 22.2 = 9.9
4 / 9.9 = 0.404 ampere primary side.
220 x 0.404 = 88 watt lightbulb in series with primary side ?
In the real world this would be a 75 watt lightbulb ?

Any problems with peak current when switching ON ?
Any problems other with this ?


--
hihihi is the username, wanadoo the domain, nl the country.

 

[Don Pearce]

On Wed, 11 Jul 2007 20:48:07 +1000, "Mr.T" <MrT@home> wrote:

"Don Pearce" <nospam@nospam.com> wrote in message
news:4694aa65.91947171@news.plus.net...
approaches to
daylight for indoor lighting are always received poorly.

No argument there, people ARE conditioned to incandescent lights at night,
at the moment.
(which of course are not so different to the lamps and candles that came
before.)
I wonder whether that will be so a hundred years from now though, when very
few people will even remember seeing one. Whether we will always demand to
emulate what we now have, or whether we will accept a gradual change to
something else, IF it is more efficient.
And of course the eyes sensitivity is not it's highest at the red end
either.

MrT.

Just thought. Some friends of mine have a house in America with a
bathroom right in the centre, which has no windows. They had one of
those sun tubes fitted that brings daylight down from the roof. The
response from guests is always the same. "Why do you have a blue light
in the bathroom?"

d

--
Pearce Consulting
http://www.pearce.uk.com

 

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[John Fields]

On Tue, 29 Jan 2008 18:53:33 -0800 (PST), bill.sloman@ieee.org
wrote:

On Jan 30, 2:47 am, John Fields <jfie...@austininstruments.com> wrote:
On Tue, 29 Jan 2008 16:06:58 -0800 (PST), bill.slo...@ieee.org
wrote:





On Jan 29, 7:09 pm, John Fields <jfie...@austininstruments.com> wrote:
On Tue, 29 Jan 2008 07:08:00 -0800 (PST), bill.slo...@ieee.org
wrote:

snip

As an intellectually challenged speaker of a restricted American
dialect of English you might be forgiven for failing to understand
what was meant

---
Fine, Bill, but if you're all that superior and you're interested in
carrying on with a substantive dialog, then you can't be forgiven
for not making yourself understood.

Substantive dialogue? Now that I've persuaded you to buy yourself a
mail-order dictionary, I think I'll bow out.

---
OK, but just make sure that you exit bowed and walking backwards and
that you don't turn around until you're clear of the building.

As for the lexicon, it's Webster's college dictionary, ISBN
0-679-40110-5 : ISBN 0-679-40110-8 which, BTW, you had nothing to do
with with my purchasing.

Sure.

If you'd like to interact with those of us who know how to use
American English effectively, I suggest you buy a copy of the
dictionary  and learn the nuances of the  language.

Since there is a Complete Oxford Dictionary in my wife's study
(admittedly the microprint version) that would be a little redundant.

---
Not really. There _are_ differences between your English and my
English, you know.
---

You should keep in mind that Noah Webster couldn't spell all that well

http://en.wikipedia.org/wiki/Noah_Webster

which he covered by claiming that his errors were more "American" than
the correct spellings.

---
Hmm...

It seems you have trouble comprehending American English since,
according to your cite, the changes weren't errors, they were
deliberate efforts made (by a brilliant man, BTW) to clean up the
baroque language we brought with us from England.
---

Your ancestors bought the story and you have
been spelling like yokels ever since.

---
_You_ would say that, wouldn't you?
---

That - of itself - doesn't make
you communications unintelligible. The Elizabethans were prone to
idiosyncratic spelling which didn't stop Shakespeare (or whoever
actually wrote his plays) communicating very effectively, even though
he never signed his own name the same way twice, but social
conventions have changed since then ...

---
Indeed.


--
JF

 

[Lostgallifreyan]

Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote in
news:4686254E.2F0C39B5@hotmail.com:

Which means most of it ends up where it won't warm YOU.

Don't be daft, I don't exist in a vaccuum! I already posted, at LENGTH,
that it's healthier to avoid excessive thermal gradients focussed on our
own bodies. I'm sure you disagree, but by now that's because it's me saying
it, isn't it? Nothing to do with actual science.

 

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[Eeyore]

ehsjr wrote:

Kirk wrote:
I have been wrapping around my supplier circle and no one of them can tell
me where to get these light bulbs.

Image of bulb
http://www.kirken.ca/support/images/3mm_incandescent_with_leads.jpg

Specs of this item:

12V
50 mA - 70 mA
3 to 5 inch lead wires
3mm diameter

Ay info on a manufacturer part number for this would be helpful.

Grain of wheat bulb.

Also 'pea bulb'.

Graham

 

[Phil Allison]

"Arny Krueger"
"Phil Allison"

Fallicy #1 - all CFL's are the same.

** No-one said that.

Total red herring anyhow.

The variations in dimmable CFLs are pretty obvious in use.

** WRONG subject - you fucking IMBECILE !!!!!!!!!

Dimmable CFL's are available in enough different
wattages to be useful in a wide variety of applications.

** Shame they are prohibitively more expensive and hard
to find.

Dimmable CFLs are available in the US ...

** None on general retail sale here in Aussie.

True that disposal is more critical especially because
of the the mercury. However, I've seen situations where
CFL's outlast incadescents by 20:1.

** Non sequitur - most folk have seen the reverse far
more often.

I am reflecting on my experience which is based on the use of several
100's of bulbs in a church/school.

** Try following the context too - you fucking IMBECILE.

** More example selecting.

Homes in Australia are mostly all electric.

Not true in the US.

** So fucking what ?

God you stinking YANKS are so fucking parochial.

Clearly not true at all if you are cooling the room,
which is true in maybe 90% of the US in the summer.

** Domestic lighting is only used at night, when a little
extra heat is mostly welcome.

IME, not true.

** Yawn - Arny the ASS just ignores what is actually posted.

Typical ASD fucked, compewter geek, egomaniac with a bad attitude.




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[Pieter]

On Thu, 22 Nov 2007 10:27:18 -0000, "Cornelius J Rat"
<corneliusjrat@yahoo.co.uk> wrote:

"Joerg" wrote
Hallo Leute,
snip
Ich frage hier in einem EU Forum, weil es in USA eher ueblich ist, den
Kram einige Tage vor Dienstreise anzumieten und zum Kunden schicken zu
lassen. Funzt wie am Schnuerchen, aber man weiss oft nicht genau, was

Is sci.electronics.components an EU forum?
Nick

A world forum?
P.

 

[John Fields]

On Tue, 29 Jan 2008 07:08:00 -0800 (PST), bill.sloman@ieee.org
wrote:

On Jan 28, 6:16 pm, John Fields <jfie...@austininstruments.com> wrote:
On Sun, 27 Jan 2008 17:23:30 -0800 (PST), bill.slo...@ieee.org
wrote:

snip

Or, BTW, many employment offers.

And 555 experts get job offers from all over the world?

---
I can't speak for anyone else, and I don't get job offers, but I do
get design work from clients all over the world.

You, however, vehemently being a 555 adversary, (and certainly not
an expert) seem to have become unemployable.  

Cause and effect?

Probably not - the 555 isn't being designed into new products these
days, outside the bizarre niche market which you exploit.

---
You mean USENET?
---

Perhaps you should start brushing up on your 555 skills; you might
at least then qualify for an entry level technician position in one
of the myriad firms which has passed you by.

I'm inclined to agree that skill in using the 555 would be evidence of
the kind of hobby interest in electronics that one would look for in
candidates for an
entry level technician position. I'm a little too old and a little too
over-qualified to be a candidate for this kind of job, as you'd know
if you had much experience of working in companies big enough to hire
wet-behind-the-ears technicians.

---
As I recall, one fairly large company I used to work for,
Racal-Milgo, hired older technicians along with young ones, so your
assumptions are hardly universally correct.
---

snip

Well, you would like to think that.

---
That's exactly what I think, not what I'd "like to think."

Is English not your first language?

Is it yours? The implication of "you would like to think that" is not
that you are thinking something other than you claim, but rather that
your opinion is one that suits you, with a strong suggestion that a
more objective observer would have a different opinion.

---
LOL, by "a more objective observer" surely you mean someone who
would side with you.
---

A similar phrase was famously used by Mandy Rice-Davies during the
Profumo scandal in the U.K. in 1963 and variants are often presented
as quotations of what she said.

http://en.wikipedia.org/wiki/Mandy_Rice-Davies

---
So you want to be my mistress???
Sorry, I don't swing that way.
---

As an intellectually challenged speaker of a restricted American
dialect of English you might be forgiven for failing to understand
what was meant

---
Fine, Bill, but if you're all that superior and you're interested in
carrying on with a substantive dialog, then you can't be forgiven
for not making yourself understood.


--
JF

 

[James Sweet]

"cmdrdata" <cmdrdata@mail.com> wrote in message
news:1185300385.243124.120050@q75g2000hsh.googlegroups.com...

On Jul 23, 2:24 pm, "robb" <s...@where.on.net> wrote:
any suggestions on source for small carbon brushes (small quantity)

A long long time ago I had to do the same on a small motor. I took
apart
a D-size carbon zinc battery and the center core was a carbon rod that
I file
down to match the size of the carbon brush. It worked fine.

That's a clever idea in a pinch, I hadn't thought of it. In most cases it'd
be easier to buy the right or similar brush though rather than file one from
scratch.

 

[John Fields]

On Mon, 28 Jan 2008 19:22:11 -0800 (PST), bill.sloman@ieee.org
wrote:

On Jan 29, 2:24 am, John Fields <jfie...@austininstruments.com> wrote:
On Mon, 28 Jan 2008 16:30:03 -0800 (PST), bill.slo...@ieee.org
wrote:

On Jan 28, 6:40 pm, John Fields <jfie...@austininstruments.com> wrote:
On Mon, 28 Jan 2008 08:03:19 -0800 (PST), bill.slo...@ieee.org
wrote:

snip

If I simplified the message enough for you to comprehend it, I'd bore
the bulk of my audience,

---
Which would be a step in the right direction.
---

Perhaps for you.

---
Indeed!  The best part of your dismal posts is when they aspire to
boring.
---

Perhaps you would like to quote one of these "best parts"?

---
Sure. Just look at the terminally insipid "Perhaps for you.", above.
---

I've not seen any evidence that you comprehend anything more
complicated than the proposition that Texas is not a great place to
live.

---
There are none so blind as those who will not see.
---

and there wouldn't be much message left ...

---
There wasn't much to start with, and diminution toward zero could
only be a good thing.
---

Your opinion of information you can't understand isn't exactly useful
or interesting.

---
So you don't like constructive criticism?

On the contrary, I value it. You might try producing some sometimes,
but I wouldn't give up the day job.

---
The most recent constructive criticism I offered was showing you why
your rotary hex switch - toggle switch scheme was flawed because it
didn't meet the OP's display criterion and why mine wasn't because
it did.

Your resulting tirade shows that, clearly, you rail against _any_
sort of criticism sent your way, belying the claim that you value
constructive criticism.
---

No doubt because you consider yourself to be the Crown of Creation
and you think everyone should kow-tow to you no matter how far your
ridiculously inaccurate, self-serving claims of intellectual
superiority go.
---

You flatter me.

---
If you think that, then my claim that you're the one with
comprehension problems seems to be borne out.
---

I don't consider myself intellectually superior to
many people at all - I do consider myself intellectually superior to
you,

---
Well, of course you do. You _have_ to in order to keep your house
of cards from collapsing around you.
---

but then who wouldn't.

---
Hmm... It's not like you could intentionally write a sentence with
two meanings, so I suspect your lack of command of the language led
you astray.

Did you mean: "But then who wouldn't consider themselves
intellectually superior to you?" or: "But then who wouldn't consider
me to be intellectually superior to you.

If the latter, I suspect your wife (knowing you as well as she must)
would fit the bill.
---

You may like to think that this claim is
inaccurate, but it is scarcely self-serving - being your intellectual
superior isn't an uncommon distinction. Even Jim Thompson could
probably manage it if he confined himself to electronics.

---
Shirley, you jest.

As far as intellect goes, Jim could easily outstrip you technically
with his brain tied behind his back and, politically, most any peon
could bring your stupid liberal philosophism to its knees.
---

most of the time you really aren't part of the target audience.

---
Thanks for the compliment!

Another message you obviously didn't understand

---
I think the lack of understanding is yours,  since my not being part
of your target audience separates me from the dullards who are.

Possibly - you do take being a dullard to previously unplumbed depths
of dimness.

---
Being part of _your_ target audience, how could it be otherwise for
them?
---

You may not be quite ill-informed enough that other Texans
would go to the trouble of commenting on it, but the world outside
Texas does have the - perhaps egocentric - idea that you ought to know
more about the world than just Texas, in the same way that you ought
to know more about electronics than just plausible applications of the
555.

---
Well, we both know that my circuit design repertoire comprises much
more than just plausible applications of the 555, (just take a look
at this thread before you joined it) so your argument is specious on
both levels.


--
JF

 

[clifto]

Lostgallifreyan wrote:

I've heard that some news providers won't carry posts from others they
don't like. I'm not sure how true that is, but if it is, it could help
there, as the small ones who don't care will be blocked by all the big
ones. Court cases might result, but if the big ones can cite good reasons
they'll win.

Good reason: "My server, my rules."

--
"Liberals used to be the ones who argued that sending U.S. troops abroad
was a small price to pay to stop genocide; now they argue that genocide
is a small price to pay to bring U.S. troops home."
-- Jonah Goldberg

 

[Spehro Pefhany]

On Wed, 10 Sep 2008 11:56:37 -0500, John Fields
<jfields@austininstruments.com> wrote:

On Wed, 10 Sep 2008 09:35:51 -0700 (PDT), Paul <energymover@gmail.com
wrote:

On Sep 10, 9:07 am, John Larkin
jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
You could temperature control an opamp, or put a temperature sensor
nearby and tweak a compensation factor.

Thanks for the good advice. I just have a bit of experience in temp
controlling op-amps, but it sounds worth it. I nearly have a truck
load
of thermistors ranging from 402 SMD to the typical large round
versions. As far as I know it would take a bit of trial and error to
calibrate such a thermistor offset circuit for the op-amp? Also I
suppose there's no reason to add more thermal insulation to prevent
the op-amp temperature from varying as much.

---
"No reason _not_ to add", yes? Also,:

http://www.isotemp.com/product.html

JF

One reason not to put an electrometer amplifier in an oven is that
you'll greatly increase the input bias current at normal operating
temperatures (since the oven has to run somewhat hotter than the
hottest possible Ta to be effective).

Of course the variation will be reduced.

Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com