-- I agree. Plus, you won't have the Zener tempco and delta VZ/delta IZ (small though it might be since the change in IZ will only be caused by the change in the transistor's Ib as the load current goes from 0mA to 200mA) to contend with. And, a BIG plus for the LDO, you won't be dissipating the power the Zener will be _all the time_ , regardless of the load current.
-- Any common 5.6V 500mW Zener will have its Zener voltage specified at a particular test current; 20mA. This current is what _must_ flow through the Zener in order for the reverse voltage it drops to fall within the bounds specified. 40mA will not only waste 20mA, it could cause the Zener voltage to be out of spec. The beta of the transistor (more properly the alpha) is almost unimportant in this case since the base current will be very small compared to the collector/emitter current and its change will have very little impact on the Zener current from no-load to full-load.
-- The meaning was adequately clear; JW (to his credit) just likes to play, sometimes.
Yes. It's been fun. I love this groups sense of humor.
And I also like to play. See what I mean? I didn't spell out what I meant or add an emoticon, and *my* meaning wasn't clear.
-- Best Regards, Mike
I glanced at a generic curve. Not even sure where the Zener specs (if any) *are* on this box.
Yes, Beta's just for rule of thumb stuff. Base current is negligible which is the idea of the pass trans, anyway. It allows a practical resistor for such a small drop, whereas not using it forces the resistor to handle most of the current and you know...
-- Best Regards, Mike
I read in sci.electronics.design that Active8 wrote (in ) about 'Dropping 1V from a Regulated 6V Wall Wart', on Tue, 30 Dec
2003:Doesn't ALT0223 on the numeric keypad, with Num Lock on, work? ßßß
-- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL!
ß yeah. Chaos uses ctrl+alt+m for mu, etc. and that didn't work but rang a bell.
I checked unicode and character map and it says the unicode number is 03B0 or 944
?I read in sci.electronics.design that Active8 wrote (in ) about 'Dropping 1V from a Regulated 6V Wall Wart', on Tue, 30 Dec
2003:
No, this is "Windows 'extended ASCII' characters", not Unicode and 0223 works for any font that contains the character.
There are two different series; one of the form 'ALT1nn'and 'ALT2nn', which are in no logical order and the other in the series ALT0128 (which is ?, the Euro symbol) to ALT0255 (which is ÿ). Not all of the characters will show on the screen.
-- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL!
-- Not by choice, I suspect. ;-)
--
You ß believe it!
On mine, with NUMLOCK off, ALT 225 = ß, and ALT 223 = ¯
while ALT 0225 = á and ALT 0223 = ß
with NUMLOCK on, ALT 225 = ß and ALT 223 = ¯
while ALT 0225 = á and ALT 0223 = ß
Wow! That's a BIG difference ;-)
...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
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I love to cook with wine. Sometimes I even put it in the food.
Isn't that too practical and simple?
Bob
snipped-for-privacy@neti.saber.net (Wade Hassler) wrote:
OK it does work in note tab lite regardless of font. What I meant was that if I'm looking up the code in character map, it changes for different fonts. It *does* say Unicode, also.
So I don't have an extended ascii chart. ok. Nothing on MSDN CD. As usual, google rules when you know what to look for.
says 225 is beta
so does this:
are we having fun yet?
ok 225 is beta in the alt2nn series and 223 is a bar. alt0223 is a box.
That second link came from
which has a lot of possibly useful links.
Thanks John,
-- Best Regards, Mike
message news:...
Uh, yeah. I'm kicking myself in the ass. I'm the type who looks for simple elegant solutions like moveing the table closer to the handicapped person rather than try to move the heavy person to the table and I didn't think of the obvious.
Ouch.
Nice to meet you , Wade! :)
-- Best Regards, Mike
message news:...
Too easy Wade!....But still an interesting thread!
;)
ß is 223 decimal in the latin1 supplement...I read in sci.electronics.design that Active8 wrote (in ) about 'Dropping 1V from a Regulated 6V Wall Wart', on Tue, 30 Dec
2003:No. Both of your links give a DIFFERENT 'extended ASCII' series, not the Windows one. There is no standard for 'extended ASCII', so there are several different versions around.
I found the Windows list in an early WordPerfect manual. But you can compile your own by just typing in the codes and noting the result.
-- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL!
I read in sci.electronics.design that John Fields wrote (in ) about 'Dropping 1V from a Regulated 6V Wall Wart', on Tue, 30 Dec 2003:
You need Num Lock on with some versions of Windows but with others it can be on or off. ON always works, AFAIK.
-- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL!
Well, I started out in this or another thread with a RF modulator that requires 4.75 to 5.25VDC, probably because it would be off freq if the supply V got out of tolerance. I talked about the weird connector, someone said it's a Belling Lee connector, AKA Euro or PAL connector. Now I now what it is, and I bot an adapter at Rat Shack for four bucks. But I wanted something simple that I could solder onto the pins of the RF modulator, I finally resolved the problem by using a 6V unregulated wall wart, which is more like 7 or 8V, and a 5.1V zener, and 39 ohm resistor as a shunt regulator. It works just fine. But I still wanted a way to drop a single volt, with reasonable regulation, better than a 1N4003 diode which varies by up to a quarter volt. With a 1N4003 the voltage could be as high as 5.3 or 5.4V.
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I read in alt.binaries.schematics.electronic that Watson A. Name - Watt Sun, Dark Remover wrote (in ) about 'Dropping 1V from a Regulated 6V Wall Wart', on Wed, 31 Dec 2003:
That's a coaxial connector, a bit like a phono plug but with a smaller centre pin. Is that what you have?
I'd forget those descriptions if I were you. Certainly the Belling connector has very little indeed to do with PAL. It is the subject of an IEC standard - IEC 60169-2.
-- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL!
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