audio recording on IC -help wanted

[Jeff Wisnia]

Michael A. Terrell wrote:

Jeff Wisnia wrote:

I soldered in a new bulb yesterday. Tracing the circuit showed that
here's a single diode in the common return lead to both the bulbs in the
thermostat so the bulbs effectively see only half of the nominal 24 volt
AC supply.



No, it sees half power, not half voltage, so you have the equivalent
of (24 VAC * .707) -.6 V, or 16.368 volts.



I used a 12-14 volt "grain of wheat" bulb left over from my sons' model
railroading period of 20+ years ago and it worked fine.

You are right on that. The bulb I grabbed (Unmarked it was.) was
probably an 18 or 24 volt one. Anyway, it's filament lit to the same
"less than bright white" color as the other bulb (The emergency heat
indicator.) so I'm figuring all's well.

Jeff

--
Jeffry Wisnia
(W1BSV + Brass Rat '57 EE)
The speed of light is 1.8*10^12 furlongs per fortnight.

 

[networkinghardware.net]

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[ian field]

"Lostgallifreyan" <no-one@nowhere.net> wrote in message
news:Xns995BC57CCFA49zoodlewurdle@140.99.99.130...

"ian field" <dai.ode@ntlworld.com> wrote in
news:R19gi.5262$nE2.1789@newsfe3-win.ntli.net:

Does anyone know if Evolube (possibly Elvolube) still exists?

This is a product I remember from many years ago when I worked for an
instrument calibration company, its a special lubricant for electrical
contacts which I remember using on those front panel brass studs
rotary switches on decade boxes and measuring bridges.

A while back I found a crumpled tube of the stuff in a toolbox I
picked up at the dump, its sat in a drawer for years until now, the
severe rain storms have caused problems with my motorcycle brake light
switch and this lubricant (the little I have left) seems the only
satisfactory way of excluding the water.

Even if the original product no longer exists, its almost certain that
another brand has filled the gap in the market and I'd like to find
out the name with a view to obtaining some.

TIA.



Have a look generally at PFPE's poly fluoro polyethers. You won't want the
kilopoise, because the viscosity is huge, but there are finer ones. Water
repellence is excellent, as is adhesion, and unlike silicones, they tend
to
stay where you put them instead of migrating. One possible source of a
small amount of low viscosity PFPE is a scuba gear shop, it's used on the
oxy tank seals.

PTFE lubricants are common enough - what is PFPE?

 

[GdB]

Can anyone help me on:

STV5730 - On Screen Display IC
UAA1003-1 or UAA1003-3 - this is a speaking clock IC, over 20y old

Please send me an email: georgedb"at"inter"dot"nl"dot"net

 

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[Eeyore]

Jamie wrote:

I can say with confidence, that boy does not share my gene pool.

One of the milkman's ?

Graham

 

[Dave Plowman (News)]

In article <JL0w48.434@news.boeing.com>,
Albert Manfredi <albert.e.manfredi@nospam.com> wrote:

Have you never wondered why most prefer the colour temperature of
tungsten
for domestic lighting?

It's not tungsten we prefer, I don't think, but rather a color
temperature that's close to that of a flame.

Err, isn't that what I wrote? It's the colour temperature that matters
rather than the source.

--
*Some days you're the dog, some days the hydrant.

Dave Plowman dave@davenoise.co.uk London SW
To e-mail, change noise into sound.

 

[Peter Dettmann]

On Wed, 01 Aug 2007 19:18:40 +0100, Eeyore
<rabbitsfriendsandrelations@hotmail.com> wrote:

From the 1992 Dick Smith catalogue, the following are stated:
A = Linear
B = Logarithmic
C = Logarithmic
E = Anti-Log
J = Linear

Dick Smith is wrong.

In your realm he may not be right, but he is certainly not wrong.

On looking through my junk box, all the C's all measure as log, and
all the A's are linear. Another designation I found was W which is
a Wire Wound pot.

*JUNK BOX* i.e. nothing modern of course.

You have to read the whole thing, and forget your limited experience.
The whole point is that there has been no universal standard, so I am
in difficulty understanding why you are disputing this basic fact when
it has been authenticated.

I can understand now that pots marked 'Log' or 'Lin' are a much safer
method.

You're unlikely to find pots marked log or lin any more in my considerable
experience..
Graham

Quite true Graham, but your considerable expeience is not considerable
enough. Even in my limited experience, we do get pots marked Log, or
Lin. That is fact.

Peter Dettmann

 

[Spehro Pefhany]

On Thu, 13 Sep 2007 19:04:56 -0000, fcache@gmail.com wrote:

Hi,

I've just started an Associates level Biomedical Engineering
Technology program and we have to design a power this semester in
Multisim for my Electronics class and I also have to design on paper
an X-Ray machine for my Rad Physics course. I would like to actually
build a power supply that can produce volts that range from 1000 V to
60000 V. For starters, what type of chassis should I use?

Thanx,
Ed

Red.

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

 

I am looking for someone to prepare for me a fairly simple circuit
design with all components and values specified. I will be happy to
pay any reasonable amount for this service. what I want is
a device which will accept the audio input from a condenser
microphone, and pass it through a low-pass filter which will only pass
frequencies up to 12 Hz with a fairly sharp cut-off. The filtered
output should be fed into a device such as an LED array which will
approximately reflect the dominant frequency in the range 0 to 12.
Ideally, the voltage supply will be 6V.

If this is insufficient information, please get back to me.

Eddie

 

[Joerg]

Frithiof Andreas Jensen wrote:

"Joerg" <notthisjoergsch@removethispacbell.net> skrev i en meddelelse
news:NgKTj.8556$iK6.2263@nlpi069.nbdc.sbc.com...
Hey guys,

Seems like thyratrons have become quite rare these days and SCRs or GTOs
are just too freaking slow. Is there a readily available alternative that
doesn't cost an arm and a leg, meaning under $100? A kilovolt would be
nice and >50A.

How about a Cascode with a high-voltage bipolar transistor "on top" and a
low-voltage MOSFET driving the Emitter of the bipolar?

Just remember that while the Bipolar storage time runs, the full collector
current is diverted to the Base so you have to have somewhere to put the
charge. After storage time the whole contraption blocks in about 10-20 ns
so, again, there will be transients. The MOSFET only need to be able to hold
the maximum B-E voltage so it will be cheap and efficient; the Bipolar does
not have to be particularly fast and since the Emitter is cut at turnoff
it's SOA becomes square, right to the VCEmax limit.

Hope that helps.

I'll have to check that idea, thanks. The current diversion could be an
issue. It'll be tens of amps.

--
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.

 

[Chris Brown]

Hi all,

A question for those knowledgeable in this area... if I was looking to
measure humidity in a residential setting, what would be the best type of
sensor to use? I've done basic reading on the various types, but I'd like
to hear opinions from folks who really know this topic and what's out there,
practical application, etc.

Ideally, this sensor would identify undesirably high humidity conditions in
a normal household environment, would probably be replaced rather than
recalibrated once installed, and would be sufficiently accurate to prevent
any serious likelihood of false positives.

Cost, size, and reliability are of particular interest.

Anyone have any thoughts on this topic? I would greatly appreciate any
input. If this would be better posted in a different newsgroup, please let
me know.

Thanks!

- Chris

 

[Stuart]

In article <MPG.23e0d3903d9b0915989864@news.individual.net>,
krw <krw@att.zzzzzzzzz> wrote:

For anyone who knows anything about electricity or wants a tool that
has more than one use, the high impedance meter is a better choice.

Totally useless in areas of high RF.

As the man says, the proper tool for the job

 

[Phil]

Dear All,

Has anyone ever seen an off-the-shelf pushbutton that has two contacts,
one that's made on gentle pressure and a second that's made when you
press all the way down? Like the shutter button on most cameras.

I'm actually making a remote shutter release for my camera. I was going
to connect up just the main "take picture" contact, since I don't need
the autofocus in this case and it seems to work. But then I discovered
that another purpose of the first contact is to wake the camera up if it
has gone to sleep. Having a separate switch is not ideal since in this
case.

Any ideas anyone?


Phil.

 

[Lostgallifreyan]

scott93727g <eb3354@aol.com> wrote in news:5bf45acf-8ab7-461f-b777-
cecb22c2ef59@z28g2000prd.googlegroups.com:

Pwr suppley Problem
I made a power supply with 3 paralelled LM338 Regulators in paralell
(24V 12A trans), with 2 paralelled 20A rectifirs, worked great for 1
week, then all of a sudden, output dropped to 2 amps max (from 15A), ,
all componed seem to check out ok, getting full current out of filter
caaps past rectifiers, any ideas, tried substituting a good regulater,
and same thing, any ideas.

Parallel.
Now that that's out of the way, you say you're pulling 15A from a 12A
transformer for a week. Are you sure everything checks out? Or do you just
think it does? How did you test?
Did you remember to include the resistors, one low ohm high power resistor
for each of the LM338's? If not, one will have taken the strain that should
have been shared between them, and thermal shutdown probably prevented
outright failure. That might explain the low current you saw.
Check your rectifiers too, paralleling those won't share equally between
them, you need resistors just as you do with those regulators. If you need
more current than the rectifier accepts gracefully, get a bigger rectifier.

Another thing to check out carefully is your mountings, test to see if you
have case shorts to the heatsink because the outputs are on the case (I'm
assuming you're using TO3 cans) and must not connect together or to ground.

 

[robb]

so i have a **DM7496** (DIP16) that is fried (obsolete), and i
need compatible replacement
datasheet says 5-Bit shift register, R-S master slave flip
flops , parallel in/out, serial in/out

how does one go about finding a suitable replacement ? what words
to look for ?

I have found lots of 8-Bit shift register ICs, universal, shift,
latch, storage, s->p, p->s, and various varieties but nothing
that looks similar or familiar to the 7496 datasheet

then i suppose if i find a similar 8-Bit shift reg version i will
need to do something special to the 3 regs not needed or used ???
like ability to address/mask/disable certain regs or address
where i get serial out from or maybe use the #5 parrallel out as
source for serial out ? and let the last 3 regs float ??

any helpful ideas very very welcomed,
robb

 

[Archimedes' Lever]

On Wed, 21 Jan 2009 19:41:04 -0600, krw <krw@att.bizzzzzzzzzzz> wrote:

On Wed, 21 Jan 2009 17:04:38 -0800 (PST), "David L. Jones"
altzone@gmail.com> wrote:

On Jan 22, 10:10 am, krw <k...@att.zzzzzzzzz> wrote:
That wasn't at issue here. The statement was made that a high
impedance meter couldn't be used and that a low impedance *ANALOG*
meter was a necessity.

Ok, I haven't followed the entire silly thread.
From my side I've only been proposing that high impedance meters can
be a problem, and the solution is using the right tool for the job.

Yes, they can be a problem if YOU DON'T UNDERSTAND WHAT YOU'RE DOING.
If you know what you're doing you can get the right reading form a
high impedance meter just as well as one that has been crippled by the
manufacturer. If necessary, you can cripple it yourself, though that
is rarely needed.

Absolutely correctly worded.

 

[JackShephard]

On Tue, 05 Jun 2007 17:59:39 -0700, Joerg
<notthisjoergsch@removethispacbell.net> wrote:

Hello Folks,

Ok, first, those card ejectors from RichCo and other mfgs don't seem to
be in stock anywhere. Is there a place that sells them by the dozens and
not truck loads?

Other: We've designed the boards per spec. Holes for the ejector 250mils
in, boards exactly Eurocard length (160mm) but the boards aren't flush
with the front rails of the VME cage. So maybe those ejectors wouldn't
work anyhow.

Are there any "pull tools" available? We used to have those for
ultrasound machines because ejectors were rattling to much. But that was
many moons ago and I don't have the foggiest where they came from.
Basically they caught the holes and then you cantilevered the board out.
Of course, engineers didn't want to be sissies so we kept pulling by
hand until thick callusses developed.

Liar!
You got them pulling on your dick.

 

[Lostgallifreyan]

krw <krw@att.bizzzz> wrote in
news:MPG.211c7232f4a1cdd298a889@news.individual.net:

Dimmie is as stupid as we all know he is (I.e. MassivelyWrong).

I have to agree. The smoke is the same, and he doesn't seem to recognise my
comment in my most recent post. I think Shakespeare had it well: Better a
witty fool than a foolish wit.

 

On Sep 11, 1:41 pm, "Green Xenon [Radium]" <gluceg...@excite.com>
wrote:

Drexterity wrote:
A molecular assembler as defined by K. Eric Drexler is a "proposed
device able to guide chemical reactions by positioning reactive
molecules with atomic precision."
Drexler also introduced several related terms, such as "molecular
manufacturing," which he defined as the "construction of objects to
complex, atomic specifications using sequences of chemical reactions
directed by nonbiological molecular machinery", and "molecular
nanotechnology" that comprises molecular manufacturing together with
its techniques, its products, and their design and analysis.

Could it be possible that in the not-so-distant future we could be
able to manufacture our own gadgetry at home?
It certainly sounds more like fiction than science, and the idea has
both its advocates and detractors.

This video explains the process of molecular manufacturing and further
assembling.
Whether or not it's a viable process remains to be discovered, but the
project does make some sense.

http://gadgettinyinspector.blogspot.com/2007/09/nanotech-assembler.html

Speaking of nano-technology, I've got a relevant question.

AFAIK, nanobots will use molecular conformation changes (e.g., Drexler's
"mechanical" computation) or electronic energy-level transitions to
process internal information.

Drexler info:http://www.e-drexler.com/d/06/00/EOC/EOC_Table_of_Contents.html

Which has more advantages, mechanical computation or computation using
electronic energy-level transitions.

Since you can't actually do anything useful with either approach, this
involves distinguishing zero from zero, which happens to be a waste of
time.

If you want to read science fiction, read Neal Stephenson - at least
he can write entertaining nonsense.

--
Bill Sloman, Nijmegen