Driver to drive?

Tim Wescott wrote:
Tim Wescott wrote:


Discriminator, as used in FM radio. However, a three-state
phase/frequency detector with an appropriate loop filter will often
do
well enough without a bunch of fussy resonant circuits.


I should add that the 74HC4046 has three different types of phase
detectors. Fairchild Semiconductor has a nice description of the
phase
comparator action in their datasheet:
http://www.fairchildsemi.com/ds/MM/MM74HC4046.pdf.
Click to expand...
The Philips 74HCT9046 has a rather better phase-frequency detector -
see the data sheet for details

http://www.semiconductors.philips.com/acrobat_download/datasheets/74HCT9046A_5.pdf
-----------
Bill Sloman, Nijmegen
 
ominidirectional base speaker
jondoeengineer

That's *bass*.
Click to expand...


Now, what is a "plain ol'...."?

You chopped out the most important part of Grise's post.
Click to expand...
Here it is again: inductive loop.
http://www.google.com/search?&q=headphones+induction+OR+inductive+cordless+OR+wireless+-Infrared+-Infra-red


ignorant on FCC regs

Grise's solution avoids that.
Click to expand...
Mac also (wisely IMO) suggested avoiding RF.
 
In article <kv0mt0ln9l4qrnjein2d35homkgr6vm73u@4ax.com>,
Jim Thompson <thegreatone@example.com> wrote:
[...]
Correct! You can only get a signal proportional to *phase* when both
frequencies are the same.
Click to expand...
unless:

If you define the difference between the frequencies as the rate that the
phase is shifting, then the XOR phase detector correctly shows the
changing phase angle for half of a cycle of the beat frequency. On the
other half, it shows a decreasing phase shift instead of the correct
increasing phase shift.

If the phase detector is part of a PLL, the nature of this output for
unequal frequencies is important in considering whether the circuit will
lock.

--
--
kensmith@rahul.net forging knowledge
 
"Reg Edwards" wrote -

Reg, I just *love* your reply... shows TOTAL IGNORANCE as to where we
get a great portion of our oil.

===================================

Dear Jim, I think you've missed the rather obvious point.

Your World geography and geology need brushing up.

It is not where the oil comes from at present which matters.

What matters is from where the USA intends to obtain its oil when the
present supplies run out. There's not a lot left. There's not a lot of
time
left either.

And how could you say such a naughty cruel thing to an old man like me?

Have you no respect for your elders? Boo-hoo!
----
Reg

====================================
Click to expand...

But as an analogue engineer you can't be too bad. ;o)
----
Reg.
 
In article <10tmhvqmn1k9oc4@corp.supernews.com>,
Guy Macon <http://www.guymacon.com/> wrote:
[...]
aren't you? I don't know what the "Quartz" is all about, but
it sounds like a great way to get dissolved silicon oxide in
your ultrapure water.
Click to expand...
Take a slice of quartz and drill a hole this big:


-----------------------------
H H ^
\ / Diameter of the hole
O V
-----------------------------

The water vapor can go through but bigger stuff can't.

--
--
kensmith@rahul.net forging knowledge
 
I prefer to put the voltage limiter across the *driver*,
contacts/transistor, not the coil, because it is the *driver* and not *the
coil* that needs overvoltage protection (and some site techies might forget
it if it is not soldered in ;-)!!
Click to expand...
See http://www.guymacon.com/SUN/INDEX.HTM section
titled "Industrial washing machine control."
 
Ken Smith wrote...
Take a slice of quartz and drill a hole this big:


-----------------------------
H H ^
\ / Diameter of the hole
O V
-----------------------------

The water vapor can go through but bigger stuff can't.
Click to expand...
UhHuh.
Exactly how big is this hole, and how do you reliably make
one, or more to the point, quadrillions of them? Right.


--
Thanks,
- Win
 
That is curious. Did the shipping address on your order match the billing
address of the credit card?
 
On Wed, 05 Jan 2005 13:48:06 +0000, Guy Macon
<http://www.guymacon.com/> wrote:


Also what is the best way of storing ultra pure water

It doesn't exist. You need to purify it on the spot. Ultrapure
water will dissolve anything it possibly can, and you want to give
it as little time leaching chloride from plastics and dissolving
metals and glass as possible. Making pure water is difficult,
and keeping it that way is impossible
Click to expand...
Ice?

John
 
On Wed, 05 Jan 2005 13:48:06 +0000, Guy Macon <http://www.guymacon.com/> wrote:

MIME-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII


(Keeping in mind that I am an electronics engineer with quite
limited knowledge of chemistry and some experience in designing
low-cost low-performance resistivity meters...)

WayneL wrote:

I am after water with an R>18[Mohm/cm]

Water over 18.2Mohm/cm@25C doesn't exist. At room temperature
it spontaneously forms H+ and OH- Ions (and H3O+ Ions?
My memory fails me on that one).

Also, at what temperature? Ultrapure changes resistivity
4.5% per degree C @25C.

Also what is the best way of storing ultra pure water

It doesn't exist. You need to purify it on the spot. Ultrapure
water will dissolve anything it possibly can, and you want to give
it as little time leaching chloride from plastics and dissolving
metals and glass as possible. Making pure water is difficult,
and keeping it that way is impossible

Should I dispense it in to several small bottles with pipette lids?

No. To stay even close to 18.2Mohm/cm@25C you must start with
vacuum degassed ultrapure water and then never let it contact
air.

O2 dissolved in the water makes it better at attacking metals
(and lowering the resistivity) and dissolved CO2 will make
carbonic acid, which then attack the metal. You will get
lots of CO2 in the water even though the air doesn't have
much because CO2 dissolves so well, and ultrapure water has
little or no buffering capacity.

The pH of pure water is around 7 if I recall correctly, but
after being exposed to the air for a while the dissolved CO2
gives you a pH reading closer to 5. This will drop your
resistivity to somewhere in the 7 to 12 Mohm/cm@25C range.
Please note that measuring the pH of ultrapure water with
a pH sensor will not work right. Too little conductivity.

If this doesn't frighten you enough, do a Google search
on [ oligotrophic ultrapure ].
Click to expand...
One site (http://aem.asm.org/cgi/content/full/68/4/1548) says "The extracellular
polysaccharide matrix acts as a diffusion barrier to nutrients and cellular products and
allows nutrients from the flowing water to reach bacterial cells"
^^ nutrients? What nutrients? It's just water with "... less than 1ppb
contaminants". Anything that can find nutrients there is going to be, as they say,
impossible to get rid of.

Better get some superbright
UV lamps!

Quartz Triple distilled water

You are aware that distillation *concentrates* some impurities,
aren't you? I don't know what the "Quartz" is all about, but
it sounds like a great way to get dissolved silicon oxide in
your ultrapure water.
Click to expand...
 
On Tue, 04 Jan 2005 08:35:46 +0000, Kevin Aylward wrote:

Rich The Philosophizer wrote:


How?

Do you mean why?

No, I mean how. As in, how do you "know better" (than that free will
is a valid concept)?

Oh... by logical deduction based on axioms.

No, that's not science.

Here we go again. Of course its science.


Show me the study that you used. Show me the experiment that proves
conclusively that there is no such thing as free will.

Its based on logical extrapolation of exiting, varified, science. I have
given you the argument many times, to wit:
http://www.anasoft.co.uk/replicators/specialreplicators.html
http://www.anasoft.co.uk/replicators/intelligence.html

The "proof" is one based on the no magic axiom, to wit,
http://www.anasoft.co.uk/replicators/magic.html
Click to expand...
In other words, you got nothing.

Good Luck!
Rich
 
John Larkin wrote:
Guy Macon <http://www.guymacon.com/> wrote:

Also what is the best way of storing ultra pure water

It doesn't exist. You need to purify it on the spot. Ultrapure
water will dissolve anything it possibly can, and you want to give
it as little time leaching chloride from plastics and dissolving
metals and glass as possible. Making pure water is difficult,
and keeping it that way is impossible

Ice?
Click to expand...
John, that's the most brilliant yet simple idea I have heard in
quite some time. Freeze the ultrapure water, and before you thaw
it saw away or melt away the outer layer. That sounds like it
would work.

I imagine the block of ice will be very, very clear.


--
Guy Macon <http://www.guymacon.com/>
 
The Phantom wrote:
Guy Macon <http://www.guymacon.com/> wrote:

If this doesn't frighten you enough, do a Google search
on [ oligotrophic ultrapure ].

One site (http://aem.asm.org/cgi/content/full/68/4/1548)
says "The extracellular polysaccharide matrix acts as a
diffusion barrier to nutrients and cellular products and
allows nutrients from the flowing water to reach bacterial
cells" ^^
Click to expand...
Nutrients? What nutrients? It's just water with
"... less than 1ppb contaminants".

It doesn't seem like it, but they do grow in ultrapure water.
One kind makes a living by grabbing the manganese from any
stainless steel it finds. Another grows (very slowly) these
fine white filaments that look like fine thread - I have seen
these growing in ultrapure water in a PTFE Teflon container.

Anything that can find nutrients there is going to be, as
they say, impossible to get rid of.
Click to expand...
Not so. Bright UV lamps do the job. Then you have to
remove the tiny dead carcasses.

--
Guy Macon <http://www.guymacon.com/>
 
"sjcma" in news:E_6dnXTsXooJXAvcRVn-1Q@rogers.com...
I'm hoping someone can enlighten me on the definition(s) of a Colpitts
oscillator. ...
Click to expand...
You don't even have to ask, you can look it up in the archives. For
example, Question #16 in

http://tinyurl.com/4g4xp

Google has this as the first newsgroup posting on the subject.
 
Kill yourself any way you want; just keep the blood off your e-mails!
 
I used this system years ago, for wireless headsets in a hamshack.
Pocket boxes with loopstick antenna and amplifier, into standard headphones.
Beware feedback coupling though!

Works wonderfully, until you cross the wire, then poof.. As expected.
 
I'm still recovering from the shock I went into when people reported that
they routinely solder whole boards in one whump in a TOASTER
OVEN!!!!!!!!!!!
Click to expand...
See the EZ-Bake group on Yahoogroups.
 
Scott Stephens wrote:
I'm cross posting this, because I like to rant here so much =)

Perhaps because there are liberals, government orcs, and academics
parasites around. Anyways, a movie about Hollywood and the Democratic

party as it really is under the media propaganda and university
political correctness?
Click to expand...
And you think the Republican party is any different? J.Edgar Hoover
remained head of the FBI until he died by (mis)using FBI resources to
collect sexual scandal on politicians of all parties, whom he then
black-mailed.

http://www.crimelibrary.com/gangsters_outlaws/cops_others/hoover/2.html?sect=18

The trouble with you right-wing nit-wits is your remarkable ignorance.
---------
Bill Sloman, Nijmegen
 
I read in sci.electronics.design that The Phantom <phantom@aol.com>
wrote (in <2somt0lv21jrjoe3gmo9q6craoqnmjh1sf@4ax.com>) about 'Guy
Macon's adventures with ultrapure water', on Tue, 4 Jan 2005:

What nutrients? It's just water with "...
less than 1ppb contaminants". Anything that can find nutrients there is
going to be, as they say, impossible to get rid of.
Click to expand...
Homeopathic metabolism! The bugs feed on what was dissolved in the water
BEFORE it was purified.

We are all doomed.
--
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
 
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