"Tim Shoppa" a écrit dans le message de news: snipped-for-privacy@g44g2000cwa.googlegroups.com...
So put the 317 inside a rectifier bridge (if the discontinuity isn't too sloppy).
-- Thanks, Fred.
You were right the first time.
P = I^2*R so => R = P/I^2
If you want to stay with voltage then you need to rearrange what you gave.
It's P = E^2/R so => R = E^2/P not the version you mentioned. :-)
Robert
AFAIR they used to be known as barretters, Their major design characteristics were a long (ribbon) filament and an envelope filled with hydrogen (for the highest thermal transfer from the filament?).
The nearest modern equivalent would be a bulb with a straight filament (not coiled), and gas-filled. Halogen-filled torch bulbs are readily available.
1.43 P ( V ) ---- = (----) Po ( Vo )Where Po,Vo are the nominal rated Power,Voltage and P,V are at other voltages.
Claimed to give a reasonable approximation for ordinary small filament lamps. I suspect for vacuum lamps though.
-- Tony Williams.
Tony,
I have been watching you valiantly struggle trying to get your equations to look nice. They do - congratulations!
Unfortunately, google has other plans. When your post appears in the archives, it will be displayed in html, with arbitrary line breaks to accommodate advertisements and their peculiar page layout. It may be unreadable, or it may look fine but be read incorrectly.
You can click on the original post to see the original equations, but this takes time and extra steps since you have to back out of that page and hope your browser puts you at the same point on the original page.
One solution that might help would be to bite the bullet and put the entire equation on one line, using brackets to indicate grouping, like this
(P / Po) = (V / Vo)^1.43
People who write in BASIC would have no problem reading this equation, and it will still be readable when google puts it in html.
If this looks reasonable, here are a few links that discuss ascii math notation in more detail. (The first one is the best.)
"Math Notation via Email"
"Math Notation with ASCII"
"Guidelines for Using ASCII"
"Order of Operations"
"Typing Math"
Mike Monett
There are more than a few power laws at play that accurately model all the ciruit and light parameters, but they drop out with large error after about 20-30% deviation from the rated volatge.
The above quoted formula looks ok. But netscape newsreader orignally showed the above equation with the 1 as a superscript...totally confusing.
mike
-- Return address is VALID but some sites block emails with links. Delete this sig when replying. . Wanted, PCMCIA SCSI Card for HP m820 CDRW. FS 500MHz Tek DSOscilloscope TDS540 Make Offer Wanted 12" LCD for Compaq Armada 7770MT. Bunch of stuff For Sale and Wanted at the link below. MAKE THE OBVIOUS CHANGES TO THE LINK http://www.geocities.com/SiliconValley/Monitor/4710/
How much waveform distortion can you tolerate? And, how quickly must this regulator respond to a step change in the input voltage?
If you hold down the Ctrl key when you click on a link, it will open in another window (leaving your original window intact).
You can configure Mozilla's browsers to open a new tab instead of a new window.
There is also a link at the top-right of every thread page for Fixed Font (monospaced). . .
Nice collection.
In this case, the Fixed Font link right there on the page works just fine.
BTW, all: "hl=en" means "English-only". You can delete it from any Google link and let the preferences of the person who clicks the link take over.
In the archive of s.e.d., it has no meaning at all.
Hi Tony,
They changed the interface to Google Groups and it became much slower and harder to use. But it is still invaluable for research. Here's the url for sed in Canada. I can't get to the US site from here so I don't know what happens if you try it from another country:
Here's your post in html. They use to try to space things over but it doesn't always work. In this case, it is not as bad as most, but you can't predict where your post will end up on the page and where they will break a line to make it fit. So an equation on several lines might get clobbered.
Mike Monett
Hello Mike,
I know nothing at all about reading newsgroups through Google, so thanks for the description of what happens to my beautifully crafted ascii. One-liners in future then.
-- Tony Williams.
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Mike, Tony,
you still have the "show options/show original" buttons that'll give you the true ascii text.
-- Thanks, Fred.
I think google groups has an option to display the original in a fixed font, and if you find it really important, your browser should have a setting to use your own fonts instead of the fonts suggested by the HTML.
OK, I have googlegroups open in a browser at my elbow - I was looking up something else, but here's what I've done, just because I have the time: It seems that in the upper right-hand corner there's a "fixed font- proportional font" link thingie, so I've selected "fixed font". THEN, each quoted message in the thread has a "Hide options"/"show options" link - and THEN, if you select "Show options", and THEN, you can click "Show original", and see it in the original fixed font format.
I say, we boycott google groups until they put that beta where it belongs, which is the bit bucket, and go back to the original version, and if the script kiddies can't handle it, then to hell with the script kiddies.
Google Should Not Be A Blog.
AND the ads have been there all along, just not in your face, which is what made Google attractive to the Real Professionals in the first place.
Failing that, it shouldn't be that hard to get a real newsserver - every _real_ ISP I've ever heard of has one, and newsreaders are free - Netscape has one, Windoze comes with Outlook Express (which _can_ be configured, and idiot-proofed, unless you _are_ the idiot), and so on. (e.g., Linux has more newsreaders than I can count on one hand.)
Thanks, Rich
You can delete almost all of those query string parameters. The only one you really need is the q=, as in, say, for example, I want to look up "stupid people on googlegroups", I can type, right here at my keyboard, with my fingers,
When I put "stupid people on googlegroups" in the google search window (with quotes), I get a bunch of nothing, but it will probably show this post after it's had a chance for its spider to index the post. But when I put it in the search window without the quotes, it shows me this in the address bar:
The ampersands separate the name=value pairs in the query string.
And here we go again, having to do extra work to explain what the f-ck-ing s--theads have done because it's so f--king unnatural, and user-hostility seems to be the order of the day. Feh!
Hope This Helps! Rich
Say it loud! . .
Always has been. Until recently, however,
A few months ago, Google changed the algorithm and
and
If you're posting links, inserting %22 is the least preferable method WRT the Usenet Archive. Google will accept
If all who post a URL with a leading %22, added a leading + like this %22+escaped+quote%22 it would make their strings Google-searchable (without changing the viability of the link) so that folks searching the Archive would not have to run their search strings once (regular) then tack 22 onto the front of them and try again
BUT THIS "escaped+quote" makes it FIVE CHARACTERS SHORTER and only takes 1 search. . . . Hex characters %20 whitespace Replace it with a + if using double quote marks %22 Replace it with " (double quotes) %26 & (Don't try to replace it; use the ASCII code.) %27 Replace it with ' (apostrophe) %2B Replace it with . (period) %3A Replace it with : (colon) %40 Replace it with @ (at sign) Anybody ever heard another name for this?
GENERAL GOOGLE STUFF (You covered most of this.) &q= query (search string) &hl=en language (English) &safe=off don't filter results for what might be offensive in Utah &filter=0 show every page that matches (sub-threads, Supplemental Results, etc.) &ie= input encoding (character set) e.g., UTF-8 Shift_JIS (Japanese) &oe= output encoding (character set) ISO-8859-1 ISO-2022-JP &num= maximum number of items per page &lr= Not sure--someone said it is limit (maximum number of items) &btnL= I saw where someone said it means "I'm feeling lucky"--but that can't be. &btnG= By his logic, this means "Google" search (links; search string shown in context) &c2coff= ?? &dq= ??
IN LINKS TO GOOGLE'S CACHED PAGES &strip=1 show the cached page without the graphics
GOOGLE GROUPS &scoring=d sort by date (Google Groups) &selm= old syntax individual message (un-threaded post)
FROOGLE &scoring=p sort by price . . Anybody got more?
I got some 1869(?) 28V, 40mA lamps from Rat Shaft and used them for the neg Rf of a Wein Bridge osc. They came 2 to a pkg and both of them were intermittent. I got another pkg and they were also intermittent. Apparently when you apply full V they work okay, but the tungsten filament is clamped in the support wire mechanically, the support is just bent over and squoze on to it. At low temps, the connection can be loose, but at high temps at full brightness the thermal expansion keeps it in good contact. So don't be surprised if such phenomena manifest themselves in your measurements.
get
Try this. Put the LM317 as the load across the + and - of a bridge rectifier. Connect the ~ leads to the AC. I'm not sure you need a cap across it in this app. You still have to worry about compliance, etc.
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We use the Murata PTH8L07AR8R2M3P550 PTH resistor on the PBX line cards to limit the short circuit current to each phone to 150mA or so. Supply V is up to 56V. The 8R2 is the cold resistance, and you should be able to find out more at
Whoa! I wonder how many of those old toob radios with them I threw out back in the starving student days. I'd have a substantial sum of $$ today.
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One other point that might be important. These PYH resistors might have too much of an S curve, since they're designed for overcurrent protection. I think you can straighten it out by putting a resistor in parallel.
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