J
Jim Thompson
- Jan 1, 1970
- 0
Jim said:
I wonder how many of your IC's Robert has used and didn't even know it?
;-)
Dave
But he has me all concerned. Maybe they're not really working ?
...Jim Thompson
But he has me all concerned. Maybe they're not really working ?
...Jim Thompson
P
Phil Allison
- Jan 1, 1970
- 0
** Funny how they sell over 1 billion examples each year then, isn't it
????
The 555 ( and variants) have been and continue to be BY FAR the world's
largest selling IC type ever since it appeared in 1972.
You had maybe better read this:
http://semiconductormuseum.com/Transistors/LectureHall/Camenzind/Camenzind_Index.htm
....... Phil
J
Joel Kolstad
- Jan 1, 1970
- 0
By unit volume, I'd say the percentage of "serious" electronic designs --
where there are critical component values, fancy discrete analog topologies,
etc. -- has been on a steady decrease since the early '80s when everything
started doing digital...
Well, everything's become much more integrated these days. I remember a
design I did some years ago with a 74LS123 that got sucked into an FPGA when
we made a 2nd version of the product with expanded functionality...
R
Rich Grise
- Jan 1, 1970
- 0
They're temperature-controlled by body heat.
Set one on the nightstand for a few nights, and see how accurate it is. ;-)
Cheers!
Rich
B
[email protected]
- Jan 1, 1970
- 0
Phil said:
Not at all. Legacy designs, and land occasional egacy designer, like
John Fields, are an entirely sufficient explanation.
It would be interesting to see the shape of the buying curve - the
number bought per year every year since the part was introduced. I
suspect that that curve peaked a number of years ago, and part is now
selling predominantly into the continueing production of old designs.
I've got a copy of Camenzind's book, and I've not only read the chapter
on the 555, but I've also commented on it here - Camenzind can now see
how he might have done a better job on the original 555, not that this
would have made much difference to its usefulness or sales.
P
Phil Allison
- Jan 1, 1970
- 0
** What a load of bovine flatulence.
No case to answer.
** Then you are a complete ASS for not comprehending the significance of
the sales numbers.
........ Phil
B
[email protected]
- Jan 1, 1970
- 0
It is an impressive number - one for every six people on earth every
year. One has to wonder where they all go - washing machines and
hair-dryers and the like, I guess.
A closely reasoned response
Leading to a self-serving, but unsupported conclusion.
The book doesn't make a great fuss about the long term sales numbers -
though the initial market response was pretty spectacular.
You have provided one specific sales number, presumably derived from
Hans Camenzind's oral history , and no year-on-year sales numbers, so
the significance of your "sales numbers", whatever they are, can only
be appreciated in the echoing confines of your own head.
year. One has to wonder where they all go - washing machines and
hair-dryers and the like, I guess.
A closely reasoned response
Leading to a self-serving, but unsupported conclusion.
The book doesn't make a great fuss about the long term sales numbers -
though the initial market response was pretty spectacular.
You have provided one specific sales number, presumably derived from
Hans Camenzind's oral history , and no year-on-year sales numbers, so
the significance of your "sales numbers", whatever they are, can only
be appreciated in the echoing confines of your own head.
P
Phil Allison
- Jan 1, 1970
- 0
<bill.slowman ASD fucked fuckwit
** What a load of bovine flatulence.
There is nary a case to answer.
Totally off with the Pixies is he.
....... Phil
** What a load of bovine flatulence.
There is nary a case to answer.
Totally off with the Pixies is he.
....... Phil
J
John Fields
- Jan 1, 1970
- 0
---
With a total of 6520 posts under your belt, I'd be willing to bet
that at least one third of them contain slurs of one kind or
another, consciously or unconsciously made since you just can't seem
to help yourself.
---
---
LOL, how could they _not_ be?
---
---
Present company included, I'd have to agree with you.
---
---
??? What is it that makes you thing "right now" means the same as
"yesterday"?
---
---
LOL, what would _you_ know about serious electronics?
I mean, even for a hobby-like requirement you went for an unwieldy,
wasteful, expensive, two-chip "solution" for a problem posed right
here, remember?
---
J
John Fields
- Jan 1, 1970
- 0
---
Hardly an "occasional" designer, what with designs from, say, 30, or
20, or 10 years ago that are still being manufactured and using up
555's like crazy? Nothing wrong with that, is there? Or legacy
designers like me who know how to use a 555 to its best advantage
for many purposes and have no qualms about using it if it's the
device of choice? Nothing wrong with that either. Especially
since, unlike you, _I'm_ still a working designer. You might also
have noticed that, unlike you, I post actual working designs here
from time to time.
J
John Fields
- Jan 1, 1970
- 0
---
What difference does that make?
The point is that professional designers are designing them into
equipment as the device of choice in an intensely competitive
market.
Moreover, you try to trivialize the application in order to make it
seem like you're so above it all that washing machines and hair
dryers don't count.
M
Michael A. Terrell
- Jan 1, 1970
- 0
Jim said:But he has me all concerned. Maybe they're not really working ?
You do remember that he thinks Maxim has only sent out samples and
has never shipped an IC needed for a production run?
--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.
Michael A. Terrell
Central Florida
B
[email protected]
- Jan 1, 1970
- 0
The designs could be smaller, cheaper, faster and more
current-efficient with more modern designs and components, but
manufacturers are extremely nervous about disrupting an existing
production process. When I - briefly - worked for Chessell Recorders in
the U.K. in 1979, their 100,000-ish per year pen recorder still used a
six-transistor servo amplifier that blew up whenever the pen carriage
stalled. Development had been wanting to replace it with something
cheaper, smaller and stall-proof involving an op amp for years, but
production wouldn' risk any change to their smooth-running production.
Eventually, the Eurotherm board shook up the Chessell management team -
four of us resigned from Chessell's on the same day (purely by
coincidence) and all got to talk to the chairman of the Eurotherm
board. I hadn't been there long enough to say anything interesting, but
others had been there longer ..
Even if a slightly more broadly educated designer might have made
another choice.
Yes. I've seen them. All very nostalgic. Your recent exercise with a
4024 (the last post in this thread) reminds me of stuff I was doing in
1974 with a 4040, though I didn't decode with three diodes and a
resistor, even back then.
In terms of components, you should have been able to squeeze your
design into a single CMOS 22V10 programmable logic chip. With something
bigger but pin-compatible, like the ICT 7024 PEEL part - which is the
most recent programmable logic part that I've had a chance to play with
- you could proably have also fitted in Arlet's suggestion of dividing
by 79 once in a while to get the average frequency closer to 420Hz, or
divided down from David L. Jones 10.752MHz crystal and got exactly
420Hz.
A more modern programmable logic part - like the Xilinx Coolrunner
series - with in-system programming, 1.8V supply and some really
compact packages - looks as if it would be even nicer, but I've not yet
been able to contrive an excuse to play with one of these parts.
Do you by any chance work for some kind of museum of technology,
exhibiting your skills alongside the guys who make flint arrowheads?
current-efficient with more modern designs and components, but
manufacturers are extremely nervous about disrupting an existing
production process. When I - briefly - worked for Chessell Recorders in
the U.K. in 1979, their 100,000-ish per year pen recorder still used a
six-transistor servo amplifier that blew up whenever the pen carriage
stalled. Development had been wanting to replace it with something
cheaper, smaller and stall-proof involving an op amp for years, but
production wouldn' risk any change to their smooth-running production.
Eventually, the Eurotherm board shook up the Chessell management team -
four of us resigned from Chessell's on the same day (purely by
coincidence) and all got to talk to the chairman of the Eurotherm
board. I hadn't been there long enough to say anything interesting, but
others had been there longer ..
Even if a slightly more broadly educated designer might have made
another choice.
Yes. I've seen them. All very nostalgic. Your recent exercise with a
4024 (the last post in this thread) reminds me of stuff I was doing in
1974 with a 4040, though I didn't decode with three diodes and a
resistor, even back then.
In terms of components, you should have been able to squeeze your
design into a single CMOS 22V10 programmable logic chip. With something
bigger but pin-compatible, like the ICT 7024 PEEL part - which is the
most recent programmable logic part that I've had a chance to play with
- you could proably have also fitted in Arlet's suggestion of dividing
by 79 once in a while to get the average frequency closer to 420Hz, or
divided down from David L. Jones 10.752MHz crystal and got exactly
420Hz.
A more modern programmable logic part - like the Xilinx Coolrunner
series - with in-system programming, 1.8V supply and some really
compact packages - looks as if it would be even nicer, but I've not yet
been able to contrive an excuse to play with one of these parts.
Do you by any chance work for some kind of museum of technology,
exhibiting your skills alongside the guys who make flint arrowheads?
J
JoeBloe
- Jan 1, 1970
- 0
Just like a Usenet IDIOT to mouth off like an ass instead of giving
the explanation.
I know this really must be a BEAR for you to cope with, but he is
right.
J
Jim Thompson
- Jan 1, 1970
- 0
WHO is it you think is right, me or Baer? I can't tell from your
attributions.
...Jim Thompson
B
[email protected]
- Jan 1, 1970
- 0
I couldn't find any numbers to supplement his single number - which, of
itself, isn't all that informative.
I notice that you haven't any information to add on the historical
trends in 555 use, apart from your personal conviction that it is the
greatest thing since sliced bread.
itself, isn't all that informative.
I notice that you haven't any information to add on the historical
trends in 555 use, apart from your personal conviction that it is the
greatest thing since sliced bread.
J
John Fields
- Jan 1, 1970
- 0
---
I guess you haven't heard that 555's have been available for some
time in CMOS and in TSSOP? Maybe even smaller, check it out if you
want to get current.
---
---
Well, Bill, it doesn't take a genius to decide when a 555 is the
device of choice, but it does take coming down from one's high horse
and admitting that it is when one takes the position that a 555 will
_never_ be used, no matter what.
---
---
Didn't know how? It's just an RDL AND...
lots cheaper than a whole 'nother chip for the decode. You may not
have noticed, but the OP was pressed for space.
Yes, most of the requests in these groups are best fulfilled with
older technology that will pretty much work regardless of the skill
level of the querant.
---
---
Using 10.752 is absurd, not only from the POV that the OP is a
rookie and would probably _never_ get a 10MHz oscillator running,
but also because of the amount of dynamic power which the chip would
have to dissipate, the need for the extra stage of division (another
chip), and the lack of a requirement for frequency accuracy better
than 0.1%.
---
---
You seem to be gravitating toward the "use a PIC" mentality when,
for the OP's purpose, suggesting that he use anything he'd have to
learn to program would be ridiculous. But that's never stopped you
before, huh?
---
---
Strange that you should bring that up since I'm working on a
flint-knapping machine which will obsolete making them by hand.
And, LOL, what makes you think a flint arrowhead won't kill you just
as dead as a round from an M-16?
J
John Fields
- Jan 1, 1970
- 0
S
Spehro Pefhany
- Jan 1, 1970
- 0
National has a CMOS part (LMC555) in a rather compact package ~ 1.4mm
square(ish) by 0.5mm thick with 0.5mm pitch balls.
http://www.national.com/packaging/mkt/tpa08xxx.pdf
Best regards,
Spehro Pefhany
square(ish) by 0.5mm thick with 0.5mm pitch balls.
http://www.national.com/packaging/mkt/tpa08xxx.pdf
Best regards,
Spehro Pefhany
J
John Fields
- Jan 1, 1970
- 0
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