Driver to drive?

[Rich Grise]

On Sat, 09 May 2009 03:27:46 +0000, Allan Herriman wrote:

On Fri, 08 May 2009 14:42:33 -0600, don wrote:

I just found a bag of AM2901 FOUR-BIT BIPOLAR MICROPROCESSOR SLICE.

http://pdf1.alldatasheet.com/datasheet-pdf/view/140822/AMD/
AM2901BDC.html

I remember making a bit slice machine out of those (or was it 2903?) back
in the day. A few MHz seemed fast at the time.

They're not really useful now, considering what you can do with FPGAs.

Remember, we're talking about an S-100 hobbyist project here. ;-)

Cheers!
Rich

 

[whit3rd]

On May 11, 9:22 am, hal-use...@ip-64-139-1-69.sjc.megapath.net (Hal
Murray) wrote:

It might be careless design, but I've seen anodizing used as the sole
electrical insulator in some applications.

I seem to remember seeing thin aluminum sheets with lots of oxide
that were used as insulators for TO-3 size transistors.  Does
anybody else remember them or am I making things up?

Yes, those exist; the problem is, you need a mounting kit that
insulates the inside of the TO-3 mount holes, because a steel
fastener could nick the inside diameter and ruin your isolation.
The mount hole fasteners aren't usually insulating, because
that's the electrical connection to the collector/case.
Teflon tubing on the bolt? Long shoulder washer through the heatsink
and insulator and partway through the mount hole?

Insulator mounts for power transistors are sometimes more costly
than the transistors.

 

[D from BC]

On Mon, 11 May 2009 19:28:35 GMT, Rich the Philosophizer
<philosobphizer@example.net> wrote:

On Fri, 08 May 2009 21:09:33 -0700, D from BC wrote:

If anyone sees, hears or feels leprechauns they should be checked for
schizophrenia, paraphrenia or other psychotic disorders.


You still haven't answered my question!

The bible stupefies people like kids chewing on lead solder.
It's ridiculous when people think the bible is all true.

What exactly is it about you that makes it so important to you to
convince everyone that atheism is "The Truth"?

Ohhh nooo.. Are you seeing leprechauns?

You're worse than any Bible-thumping fundie; are you still trying to
convince yourself, because Santa didn't bring you that pony?

Thanks,
Rich

After reading the entire Santa book, I still don't believe in Santa.


D from BC
myrealaddress(at)comic(dot)com
BC, Canada
Posted to usenet sci.electronics.design

 

[John Larkin]

On Sun, 10 May 2009 20:13:50 -0700, John Larkin
<jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:

On Sun, 10 May 2009 18:40:34 -0700,
"JosephKK"<quiettechblue@yahoo.com> wrote:

On Sat, 09 May 2009 16:39:50 -0700, John Larkin
jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:

On Sat, 09 May 2009 16:10:35 -0700,
"JosephKK"<quiettechblue@yahoo.com> wrote:

On Mon, 04 May 2009 12:32:33 -0700, John Larkin
jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:

On Mon, 04 May 2009 18:16:45 GMT, Rich Grise <richgrise@example.net
wrote:

On Sun, 03 May 2009 22:08:40 -0400, Spehro Pefhany wrote:
On Sun, 3 May 2009 17:32:18 -0700 (PDT), the renowned Greegor
On May 3, 7:23 pm, John Larkin

These crappy RatShack terminal posts are actually conductive!

http://www.radioshack.com/product/index.jsp?productId=2103639

A pair of them leak 12 pA to the chassis at +1 volt. If I ground
myself and hold the plastic screw part of one, it goes up to 20.

So I'll have to replace them with some Pomonas or something. What a
nuisance.

Pity; they do look nice.

0.000000012 Amp? LOL

No, that's 12nA. 12pA is 1/1000 of that:

0.000000000012 A

Doesn't humid air itself have that kind of leakage? ;-)

Cheers!
Rich

RH is 63% here right now, and I'm seeing about 5 fA. That's 5
microvolts across a 1G resistor.

Plenty good enough for testing diodes and jfets.

John



Is your resistor really that clean?

Seems to be. The test resistors are big long blue things from Digikey,
IRC maybe. I have a set of resistors from 1K to 5G ohms, each mounted
on a Pomona dual banana plug.

I'm using two DVMs, one to measure the upper (Z1) voltage and one
across the lower (Z2). I can short either pair of terminals and zero
out the respective DVM. If I plug in 1G and 5G resistors and apply a
few volts, I get a voltage ratio of 5.002. A good diode makes a nice
log curve down to 20 fA, which is comforting.

Being a little paranoid, I've done a number of cross-checks and
everything looks good so far.

I do have some surface-mount 100G and 1T resistors; maybe I'll ratio
them just for fun.

My ebay Keithley electrometer just arrived and seems to work. The
lowest range (on the analog meter) is 1e-14 amps full scale. It
measures the 1G and 5G resistors within a couple per cent. Looks like
this:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=200129040671&ssPageName=MERCOSI_VI_ROSI_PR4_PCN_BIX&refitem=130301449212&itemcount=4&refwidgetloc=closed_view_item&refwidgettype=osi_widget&_trksid=p284.m263&_trkparms=algo%3DSIC%26its%3DI%252BC%252BP%252BS%252BIA%26itu%3DFICS%252BUFI%252BUA%252BIA%252BUCI%26otn%3D4%26ps%3D10#ebayphotohosting

John

Sounds good, i presume you are taking steps to keep them clean?


At 5 Gohms, it doesn't seem to matter. I just tried a 100G 0805
surface-mount resistor; it read 95 G on the Keithley, 89 on my rig. I
tried cleaning the connectors and such with IPA and the resistance
went negative! Bad move. Looks like you have to be careful in the 100G
sort of range. Everything's baking now and may recover.

John

OK, > 1e14 ohms today after baking. IPA seems OK on teflon, but it's
hell on polyethylene type connectors and adapters. The Pomona dual
banana plugs are excellent.

John

 

[John Larkin]

On Mon, 11 May 2009 11:45:12 -0700, John E. <incognito@xbjcd.com>
wrote:

Why do we want to put humans back on the moon?

Employment. Ya gotta spend $$ to employ all those hands.

Ever since the end of WW II the best our government can come up with is 1)
build military stuff and 2) build space stuff.

That sort of employment just burns resources - including scientists
and engineers - which could have done productive things. Why not hire
scientists and engineers to dig holes and fill holes?

We did *not* get velcro, teflon cookware, silicon transistors, or
anything else useful from the manned spaceflight programs. We did get
to observe spiders weaving in zero-G, and semiconductors not being
fabricated behind wake shields.

John

 

[Tim Williams]

On May 11, 1:10 am, James Arthur <bogusabd...@verizon.net> wrote:

They offer a range of E-cores, toroids, in a variety of materials.

I assumed you'd want a mess of ferrite E-cores in mat'l #77--you'll
have to stack 'em to get to 10kVA.

https://www.amidoncorp.com/items/65

#77 is starting to look like the material of choice. Or something
similar, like 75 or 78.

The largest E-core Amidon offers is rated for "about 200W", which
suggests I'd need roughly 50 of them for the 10kW level I'm interested
in.

On an indirectly linked page, I discovered the data:
https://www.amidoncorp.com/specs/2-40.pdf

This says the largest core has a winding window of 2 * 0.593 x 0.375
inch (using an E-E arrangement). A stack of 50 would be 50 * 0.605 30" thick, which is certainly possible, but would stick out one side
of my chassis. On the plus side, I would certainly be able to push
all the voltage through one turn. A single piece of 3/8" tubing would
fit without too much trouble, though leakage inductance to the primary
wouldn't be great (though it doesn't need to be). Evidently, A_L
would be 5.3 * 50 = 265uH/T^2, which would be fairly "ideal". But it
seems like an awful lot of overkill, not to mention way too expensive
($312 for 50 E-cores? no thanks).

Where does cross sectional area fit into this, anyway? Isn't that
absorbed into A_L? So, as long as I am given A_L, I can calculate
inductance and saturation at will? And saturation only involves path
length, right? -- by amperes per meter, they mean *A/m*, not A.m/m^2
(like how resistivity is actually ohm.m^2/m)?

Ok, so, this is Usenet, right? If I've made an error, surely there
would have been fifty people in the first hour telling me what an
idiot I am -- since this has not happened, I can only assume my
calculations are correct??? Then why do I calculate that a moderately
sized toroid (like the FT-290-W) will suffice, whereas others have
suggested that I need something approximately as thick as my ankle?

Tim

 

[John Larkin]

On Mon, 11 May 2009 17:54:14 GMT, "Rich Grise, Plainclothes Hippie"
<Hippie@example.net> wrote:

On Sun, 10 May 2009 14:53:10 -0700, John Larkin wrote:

Why do we want to put humans back on the moon?


To build the first of the Stepping Stones to the Galaxy; sort of a "way
station" if you will, with resources fetched from the asteriod belt or
Saturn's rings, whatever. ;-) There's lots of solar energy up there, you
know. ;-)

Geez, switch off Star Trek reruns and do the math. Putting men on Mars
is insane, maybe not possible with current technology. Getting to the
nearest star is a zillion times worse.

And what a telescope platform!

As the space station should be. But we could fund thousands of
sub-arc-second terrestrial telescopes for less money.

John

 

[whit3rd]

On May 10, 8:46 am, Anti-Spam <A...@Spam.com> wrote:

I need help please. I cannot do mathmatics and need help working out
the resistor values for the voltage divider chain on a LM3914N
portable, simple read-out meter for testing solar battery
... I have based my design on this circuit
http://www.solorb.com/elect/solarcirc/vom/
but I need to use fixed value, low tolerance resistors, instead of
variable potentiometers. I am trying to design 3 versions 12V, 24V and
48V, I have also added a bridge rectifier to the input of the meter,
so that polarity is not an issue when using it.

Firstly, you can build the circuit as shown, adjust it to suit your
needs, then measure all the values you need. The deeper issue,
though, is that the measurement is useful ONLY because it
has a mathematical connection to the physical situation.
All measurement is mathematical; those numeric values printed
next to the LEDs are the only meaning you can get from
the measurement.

LED output is power-hungry, an LCD output will take less energy
and is visible in bright sunlight. I'd use an LCD voltmeter, and
run it on batteries. The 12V case is similar to auto electric
monitors, have you looked at what's commercially available?

 

[Fred Bartoli]

Rich Grise a écrit :

On Sun, 10 May 2009 12:06:59 -0700, Tim Williams wrote:

Question the first: where to find transformer (or inductor) cores?

http://www.google.com/

Good Luck!
Rich

At least you didn't suggested a PIC!

--
Thanks,
Fred.

 

[Rich Grise]

On Sat, 02 May 2009 17:15:50 -0700, Mark-T wrote:

DId anyone here see the problem presented in
the Science section of NY Times last week?
Quite startling, to see something so sophisticated
in a 'general readership' publication.

Is it solvable without a calculus of variations approach?

I don't get the NY times here. Could you transcribe the problem
here? (I'm at s.e.design, but crossposting to all of the above.)

Thanks,
Rich

 

[Richard the Dreaded Liber]

On Mon, 11 May 2009 19:38:03 +0100, Eeyore wrote:

Rich Grise wrote:

Of course, if we cut the military down to a sane level .....

In the USA ? You must be kidding.

Well, luckily, they haven't banned dreaming yet...
;-)

Cheers!
Rich

 

[Soundhaspriority]

"Soundhaspriority" <nowhere@nowhere.com> wrote in message
news:wdmdnQpMe58GTZrXnZ2dnUVZ_hydnZ2d@giganews.com...

me@privacy.net> wrote in message
news:eiff05pbi0257fqgv71hu4ie3c0cdtah15@4ax.com...
On Sun, 10 May 2009 10:51:20 -0700 (PDT), Greg Dixon
noxidgerg@gmail.com> wrote:

It could be argued that the quality of the PCM-D50 would be completely
masked by a tie-clip microphone. There are no really good tie-clip
mikes. If
you are determined to use such a mike, a low quality unit, may do just
as
well for you.

What about considering DPA's miniature microphone line? I've used the
4060 extensively and it's an excellent sounding mic that is also tie-
clippable. The 4060 is a high-sensitivity model and will pick up
quiet sounds, just as the OP wanted.

Who are DPA, can you quote a website? Can you give me the names / web
addresses of a few firms which you would recommend for easily
concealed tie clip microphones?

I would add that miniature microphones have characteristics which are not

displayed by the specs, such as handling noise, cord flexibility,
performance in different placements, damage resistance. Some microphones are
regarded as having more "reach" than others. This site brings a lot of that
out: http://www.kenstone.net/fcp_homepage/lavs_brockett.html .

I would then post a question to rec.arts.movies.production.sound, because
those people use this type of mike daily. I would post the question myself,
but they don't respond to me anymore. They are annoyed that I have been
stalking several sound engineers over the years, and have conspired to
silence me.

It's not working.

Bob Morein
(310) 237-6511

 

[Anti-Spam]

On Sun, 10 May 2009 22:54:52 -0400, "Dave M" <masondg4499@comcast.net>
wrote:

"Anti-Spam" <Anti@Spam.com> wrote in message
news:g3td05h6icrr0snn31ls03i5s57vpbvl1h@4ax.com...
I need help please. I cannot do mathmatics and need help working out
the resistor values for the voltage divider chain on a LM3914N
operating in a suppressed zero mode. I am trying to put together a
portable, simple read-out meter for testing solar battery
installations. I have based my design on this circuit
http://www.solorb.com/elect/solarcirc/vom/
but I need to use fixed value, low tolerance resistors, instead of
variable potentiometers. I am trying to design 3 versions 12V, 24V and
48V, I have also added a bridge rectifier to the input of the meter,
so that polarity is not an issue when using it.

Is there anywhere a spreadsheet or a program for working out the
values for me. Or I can pay somebody to do the calculations for me.
Can anybody help please, I am stuck.
Mark

Why don't you get those values empirically? Just breadboard the circuit
using the variable resistors as drawn, adjust them for the responses that
you want, then take the variables out, measure them and then substitute
precision resistors in their places.
You'll have to remember that the IC might have tolerances internally that
might make it necessary to use very tight tolerance resistors or you might
have to resort to variable resistors anyway.

Cheers!!

Your right of course, just did not have pots in the bits and bobs box
with values near those stated, so will have to go and get some from
the nearest town (I live way out in the country). The readings at the
end of the day are not life threatingly critical, so a bit of variance
is OK, was looking more for repeatability if we decide to build more
of the same.

 

[Jon Kirwan]

On Mon, 11 May 2009 19:30:50 +0100, Eeyore
<rabbitsfriendsandrelations@hotmail.com> wrote:

On Mon, 11 May 2009 18:06:45 GMT, Jon Kirwan <jonk@infinitefactors.org> wrote:

On Mon, 11 May 2009 08:15:23 -0700 (PDT), bill.sloman@ieee.org wrote:

On May 11, 12:27 pm, Eeyore <rabbitsfriendsandrelati...@hotmail.com
wrote:
Andrew wrote:
bill.slo...@ieee.org> wrote
Eeyore wrote:
In 30 years, the largest figure according to your choice of smoothing
etc and data source is about 0.2C.

http://wattsupwiththat.com/2009/05/07/april-global-temperature-anomal...

Graham

-So what? You keep on getting excited about short term noise, as if it
-said anything about the long term trend generated by the build up in
-C02 in the atmosphere.

The whole AGW hypothesis is based on short term data.

The Vostock ice-core data goes back some half a million years, but
since you don't see its relevance to AGW you probably aren't aware of
this.

Epica Dome C goes back another 300kyr, as well.

http://www.ncdc.noaa.gov/paleo/icecore/antarctica/domec/domec_epica_data.html

Other linked sources for paleoclimatology are also found nearby on
that site:

http://www.ncdc.noaa.gov/paleo/education.html

Jon

Going back 300,000 yrs is no help at all. It's bizarre you should even mention it.

It goes back an __additional__ 300kyr. So about 800kyr. Just to be
clear.

And it's not at all bizarre to mention it. Since you completely
removed the context, it might be possible for someone to wonder if you
were right, when in fact you merely snipped the context. I've
included it, so that my comments are in the full light of contextual
day.

On the contrary, Graham. You get all trembly when there is a single
datum that you cling to as a demonstration that AGW is false and
cannot even begin to place things in a fuller, comprehensive context.
Then, when better heads suggest that you pay some attention to longer
contexts that go beyond a single year's datum, you suggest that adding
even more context is bizarre.

What is bizarre is your way of ignoring everything that has been
learned, setting it all aside on any context you can find. If it
isn't that scientists are all a bunch of fakes, then it is that they
are greedy; if it isn't that they are greedy, then it is that they
seek power over others; if not that, then that they ignore last year;
if pressed to take a longer view, I fully expect you to then claim an
even LONGER view and try to say that 100 million years should be used.

You slip/slide anywhere and everywhere, flipping and flopping. Without
any steady drive towards a better understanding, instead seeking only
to accumulate narrow minded points in what you imagine as some debate
you might win on points amongst us amateurs.

What's kind of funny about that is that we don't matter and you don't
even realize it. If you want to dispel the AGW assignments, your
argument isn't with us. You need to master a comprehensive view and
go challenge the science, itself, through the usual processes
available. Instead, all you do is demonstrate over and over again
that you won't even bother to read the science and thereby illustrate
just how impossible it will be for you to even realize what it is you
need to deal with, let alone actually deal with it.

If you want to make a reasoned argument, you need to master a
comprehensive view and be able to argue well from your own skill
(which you profoundly lack.) To begin the process, you need to
actually __read__ some peer-reviewed papers, with understanding. Even
if you don't agree with them, you need to master them and deal with
what you consider to be wrong about them.

the same as I'd expect from someone here arguing that Ebers-Moll and
Gummel-Poon models of the BJT are not only off by a bit, but totally
wrong in every important detail. Just as if you wanted to argue that,
you need to master the science literature first.

You can't even begin to do that.

You are bizarre. We just point towards the active science work
product and summaries, which is well reasoned and where you need to be
focused if you want to say something new. Making points with amateurs
is silly minded, to say the least, and won't get you anywhere anyway.
We point you to the science. You ignore it. Which is your problem
and no one else's.

Jon

 

[Anti-Spam]

On Mon, 11 May 2009 11:47:47 -0700 (PDT), whit3rd <whit3rd@gmail.com>
wrote:

On May 10, 8:46 am, Anti-Spam <A...@Spam.com> wrote:
I need help please. I cannot do mathmatics and need help working out
the resistor values for the voltage divider chain on a LM3914N
portable, simple read-out meter for testing solar battery
... I have based my design on this circuit
http://www.solorb.com/elect/solarcirc/vom/
but I need to use fixed value, low tolerance resistors, instead of
variable potentiometers. I am trying to design 3 versions 12V, 24V and
48V, I have also added a bridge rectifier to the input of the meter,
so that polarity is not an issue when using it.

Firstly, you can build the circuit as shown, adjust it to suit your
needs, then measure all the values you need. The deeper issue,
though, is that the measurement is useful ONLY because it
has a mathematical connection to the physical situation.
All measurement is mathematical; those numeric values printed
next to the LEDs are the only meaning you can get from
the measurement.

LED output is power-hungry, an LCD output will take less energy
and is visible in bright sunlight. I'd use an LCD voltmeter, and
run it on batteries. The 12V case is similar to auto electric
monitors, have you looked at what's commercially available?

Sorry I have no idea what you mean "the measurement is useful ONLY
because it has a mathematical connection to the physical situation"

As far as LED current consumption is concerned, the circuit if you
look again, only turns on the LED's briefly every so often. As far as
LCD meters are concerned, yes you can buy cheap LCD volt meters off
ebay, but they tend to need a seperate power supply from the one they
are measuring. Also LCD meters rely upon the user knowing what the
numbers mean, where as coloured LED's give a better Go, No-Go
read-out, for the application I have in mind. Thanks for the input
anyway.

 

[Richard Cranium]

On Mon, 11 May 2009 19:30:32 GMT, Rich Grise <richgrise@example.net>
wrote:

On Sat, 09 May 2009 08:21:08 +0000, Jasen Betts wrote:
On 2009-05-08, Richard Cranium <dufus@bunghole.com> wrote:
On 8 May 2009 08:57:50 GMT, Jasen Betts <jasen@xnet.co.nz> wrote:
On 2009-05-07, Richard Cranium <dufus@bunghole.com> wrote:
Please take this as a "Get Well Soon" card from alt.video.dvd.

go away Dick Head.

Did something I said offend you?

Perhaps you are a different "Richard Cranium"

Well, a cranium isn't the whole head - just the bone. So it could be Dick
Bonehead. ;-)

Cheers!
Rich

I note your fascination with "dick" and "bone" in the same sentence.

 

[Don Klipstein]

In article <hs1g0519hreo9r3b5mapt856vukaecnvc7@4ax.com>, Raveninghorde wrote:

On Sun, 10 May 2009 16:06:51 -0700 (PDT), bill.sloman@ieee.org wrote:

http://en.wikipedia.org/wiki/File:Instrumental_Temperature_Record.png
for example.

Panicing Bill, who does not approve of people using obsolete data, is
stilll trying to flog misleading and obsolete data.

For the real picture:

http://hadobs.metoffice.com/hadcrut3/diagnostics/comparison.html

One is GISS and the other has its global one being HadCRUT-3. Both show
temperature deviation of each year from baseline along with a smoothed
curve. As of 5/11/2009, both have their most recent year shown being
2008. I would not call anything mentioned here obsolete.

The main differences:

1. GISS has deviations shown about .1 degree upward in comparison to
HadCRUT-3, due to having a different baseline level that is about .1
degree lower.

2. GISS has slightly more warming trend due to covering (via
interpolation) polar regions not considered by HadCRUT-3, including Arctic
areas that have warmed greatly.

The smoothed curves, from 1979 to 2006, increase by about .46 C for GISS
and about .41 C for HadCRUT-3.

- Don Klipstein (don@misty.com)

 

[Nico Coesel]

Tim Williams <tmoranwms@gmail.com> wrote:

On May 11, 1:10=A0am, James Arthur <bogusabd...@verizon.net> wrote:
They offer a range of E-cores, toroids, in a variety of materials.

I assumed you'd want a mess of ferrite E-cores in mat'l #77--you'll
have to stack 'em to get to 10kVA.

https://www.amidoncorp.com/items/65

#77 is starting to look like the material of choice. Or something
similar, like 75 or 78.

The largest E-core Amidon offers is rated for "about 200W", which
suggests I'd need roughly 50 of them for the 10kW level I'm interested
in.

On an indirectly linked page, I discovered the data:
https://www.amidoncorp.com/specs/2-40.pdf

This says the largest core has a winding window of 2 * 0.593 x 0.375
inch (using an E-E arrangement). A stack of 50 would be 50 * 0.605 =3D
30" thick, which is certainly possible, but would stick out one side
of my chassis. On the plus side, I would certainly be able to push
all the voltage through one turn. A single piece of 3/8" tubing would
fit without too much trouble, though leakage inductance to the primary
wouldn't be great (though it doesn't need to be). Evidently, A_L
would be 5.3 * 50 =3D 265uH/T^2, which would be fairly "ideal". But it
seems like an awful lot of overkill, not to mention way too expensive
($312 for 50 E-cores? no thanks).

Where does cross sectional area fit into this, anyway? Isn't that
absorbed into A_L? So, as long as I am given A_L, I can calculate
inductance and saturation at will? And saturation only involves path
length, right? -- by amperes per meter, they mean *A/m*, not A.m/m^2
(like how resistivity is actually ohm.m^2/m)?

Ok, so, this is Usenet, right? If I've made an error, surely there
would have been fifty people in the first hour telling me what an
idiot I am -- since this has not happened, I can only assume my

Perhaps nobody has experience in this field? I tried the same thing
you are doing for low power stuff. As someone already typed before:
there are a huge amount of units which need to be converted and each
vendor seems to have their own specification method. Its a world of
pain.

That leads to the question: why do you want to wind your own
transformer? It might be much easier to have a transformer wound which
meets your specs than failing a couple of times. At the power levels
you are talking about, a failure is likely to cause collateral damage.

If you are serious about winding your own transformer I think you
might need to buy some cores first put some windings on them and
verify your calculations. Beware that the method of winding also
influences the behaviour of the transformer.

--
Failure does not prove something is impossible, failure simply
indicates you are not using the right tools...
"If it doesn't fit, use a bigger hammer!"
--------------------------------------------------------------

 

[Kill Bill]

Soundhaspriority wrote:

"Soundhaspriority" <nowhere@nowhere.com> wrote in message
news:wdmdnQpMe58GTZrXnZ2dnUVZ_hydnZ2d@giganews.com...
me@privacy.net> wrote in message
news:eiff05pbi0257fqgv71hu4ie3c0cdtah15@4ax.com...
On Sun, 10 May 2009 10:51:20 -0700 (PDT), Greg Dixon
noxidgerg@gmail.com> wrote:

It could be argued that the quality of the PCM-D50 would be completely
masked by a tie-clip microphone. There are no really good tie-clip
mikes. If
you are determined to use such a mike, a low quality unit, may do just
as
well for you.
What about considering DPA's miniature microphone line? I've used the
4060 extensively and it's an excellent sounding mic that is also tie-
clippable. The 4060 is a high-sensitivity model and will pick up
quiet sounds, just as the OP wanted.
Who are DPA, can you quote a website? Can you give me the names / web
addresses of a few firms which you would recommend for easily
concealed tie clip microphones?
I would add that miniature microphones have characteristics which are not
displayed by the specs, such as handling noise, cord flexibility,
performance in different placements, damage resistance. Some microphones are
regarded as having more "reach" than others. This site brings a lot of that
out: http://www.kenstone.net/fcp_homepage/lavs_brockett.html .

I would then post a question to rec.arts.movies.production.sound, because
those people use this type of mike daily. I would post the question myself,
but they don't respond to me anymore. They are annoyed that I have been
stalking several sound engineers over the years, and have conspired to
silence me.

It's not working.

Bob Morein
(310) 237-6511

Maybe it would help if you used your real name, and not one stolen from
another person perhaps?

 

[Don Klipstein]

In <qiig0550365rm2sa5g0e5pt495gbrrg92h@4ax.com>, Raveninghorde wrote
in part:

I keep pulling you up on this because you are using old data to hide
the fact that the earth has been cooling for 6 years and continues to
do so.

Smothed HadCRUT-3 peaked in 2004. 2008 had a dip that we are pulling
out of.

I would call that 4 years and not continuing to cool.

- Don Klipstein (don@misty.com)