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Science Forum Index » Electronics - Components Forum » Odd 7-segment display
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| John E. |
 Posted: Wed Feb 14, 2007 6:22 am |
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Came across a 90's vintage IR controller for printing industry (drives Q-H
lamps for drying ink in the paper path) that uses a single-digit 7-segment
display that looks like a nixie tube (more like a white-hot wire segment)
display. The 16-pin DIP socket is marked IEE-Atlas, and the single-digit
display is marked "IEEFFD21 5DX C". Each digit display is 15 pin on a 16 DIP
pattern.
I've done the requisite Google, but come up with nothing. The drivers on the
PCB are MC14511BPC which is a standard CC LED 7-segment driver.
What are these? They don't look anything like LED segments (I can see each
wire-like segment behind the glass front of each digit's display). Can I just
replace these with a common LED display? Or are replacements available?
Thanks,
--
John English |
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| Michael A. Terrell |
| Posted: Wed Feb 14, 2007 7:10 am |
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"John E." wrote:
Quote:
Came across a 90's vintage IR controller for printing industry (drives Q-H
lamps for drying ink in the paper path) that uses a single-digit 7-segment
display that looks like a nixie tube (more like a white-hot wire segment)
display. The 16-pin DIP socket is marked IEE-Atlas, and the single-digit
display is marked "IEEFFD21 5DX C". Each digit display is 15 pin on a 16 DIP
pattern.
I've done the requisite Google, but come up with nothing. The drivers on the
PCB are MC14511BPC which is a standard CC LED 7-segment driver.
What are these? They don't look anything like LED segments (I can see each
wire-like segment behind the glass front of each digit's display). Can I just
replace these with a common LED display? Or are replacements available?
Thanks,
--
John English
Incandescent wires? RCA called them Numitrons.
http://www.sphere.bc.ca/test/nixies2.html
<http://www.google.com/search?sourceid=navclient&ie=UTF-8&rls=GWYA,GWYA:2006-31,GWYA:en&q=Numitron>
--
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 |
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| Michael A. Terrell |
| Posted: Wed Feb 14, 2007 7:22 am |
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Guest
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"John E." wrote:
Quote:
Came across a 90's vintage IR controller for printing industry (drives Q-H
lamps for drying ink in the paper path) that uses a single-digit 7-segment
display that looks like a nixie tube (more like a white-hot wire segment)
display. The 16-pin DIP socket is marked IEE-Atlas, and the single-digit
display is marked "IEEFFD21 5DX C". Each digit display is 15 pin on a 16 DIP
pattern.
I've done the requisite Google, but come up with nothing. The drivers on the
PCB are MC14511BPC which is a standard CC LED 7-segment driver.
What are these? They don't look anything like LED segments (I can see each
wire-like segment behind the glass front of each digit's display). Can I just
replace these with a common LED display? Or are replacements available?
Thanks,
--
John English
Search for: IEE FFD21
--
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 |
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| rebel |
| Posted: Wed Feb 14, 2007 8:21 am |
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On Wed, 14 Feb 2007 02:22:46 -0800, John E. <incognito@yahoo.com> wrote:
Quote: Came across a 90's vintage IR controller for printing industry (drives Q-H
lamps for drying ink in the paper path) that uses a single-digit 7-segment
display that looks like a nixie tube (more like a white-hot wire segment)
display. The 16-pin DIP socket is marked IEE-Atlas, and the single-digit
display is marked "IEEFFD21 5DX C". Each digit display is 15 pin on a 16 DIP
pattern.
I've done the requisite Google, but come up with nothing. The drivers on the
PCB are MC14511BPC which is a standard CC LED 7-segment driver.
What are these? They don't look anything like LED segments (I can see each
wire-like segment behind the glass front of each digit's display). Can I just
replace these with a common LED display? Or are replacements available?
Once upon a time there were incandescent 7-seg annunciator devices, under
various names. Minitron and RCA's Numitron are two names, but do a google
search on "incandescent" and "7-segment" for heaps of background. |
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| John E. |
| Posted: Wed Feb 14, 2007 3:25 pm |
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Quote: Search for: IEE FFD21
Thanks.
No replacements available.
So, since this uses the MC14511 driver, which was designed for LED 7-segment
displays, all I have to do is provide resistors to each element and rewire
for a common-cathode LED display, right?
Thanks,
--
John English |
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| John Fields |
| Posted: Wed Feb 14, 2007 3:35 pm |
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On Wed, 14 Feb 2007 11:25:34 -0800, John E. <incognito@yahoo.com>
wrote:
Quote: Search for: IEE FFD21
Thanks.
No replacements available.
So, since this uses the MC14511 driver, which was designed for LED 7-segment
displays, all I have to do is provide resistors to each element and rewire
for a common-cathode LED display, right?
---
Right.
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JF |
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| Arfa Daily |
| Posted: Wed Feb 14, 2007 7:11 pm |
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"rebel" <me@privacy.net> wrote in message
news:00v5t250rnu82m7fcb7vh8q4m6mva6ueg1@4ax.com...
Quote: On Wed, 14 Feb 2007 02:22:46 -0800, John E. <incognito@yahoo.com> wrote:
Came across a 90's vintage IR controller for printing industry (drives Q-H
lamps for drying ink in the paper path) that uses a single-digit 7-segment
display that looks like a nixie tube (more like a white-hot wire segment)
display. The 16-pin DIP socket is marked IEE-Atlas, and the single-digit
display is marked "IEEFFD21 5DX C". Each digit display is 15 pin on a 16
DIP
pattern.
I've done the requisite Google, but come up with nothing. The drivers on
the
PCB are MC14511BPC which is a standard CC LED 7-segment driver.
What are these? They don't look anything like LED segments (I can see each
wire-like segment behind the glass front of each digit's display). Can I
just
replace these with a common LED display? Or are replacements available?
Once upon a time there were incandescent 7-seg annunciator devices, under
various names. Minitron and RCA's Numitron are two names, but do a google
search on "incandescent" and "7-segment" for heaps of background.
When I was young and enthusiastic, I built a frequency counter that used
these. I think it was a Practical Wireless design. It's still around
somewhere ...
Arfa |
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| James Sweet |
| Posted: Thu Feb 15, 2007 12:10 am |
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Guest
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John E. wrote:
Quote: Came across a 90's vintage IR controller for printing industry (drives Q-H
lamps for drying ink in the paper path) that uses a single-digit 7-segment
display that looks like a nixie tube (more like a white-hot wire segment)
display. The 16-pin DIP socket is marked IEE-Atlas, and the single-digit
display is marked "IEEFFD21 5DX C". Each digit display is 15 pin on a 16 DIP
pattern.
I've done the requisite Google, but come up with nothing. The drivers on the
PCB are MC14511BPC which is a standard CC LED 7-segment driver.
What are these? They don't look anything like LED segments (I can see each
wire-like segment behind the glass front of each digit's display). Can I just
replace these with a common LED display? Or are replacements available?
Thanks,
Sounds like a Numitron incandescent filament display. These are getting
very hard to come by. |
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| John E. |
| Posted: Fri Feb 16, 2007 4:50 am |
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James Sweet sez:
Quote: Sounds like a Numitron incandescent filament display. These are getting very
hard to come by.
Purchasing LED 7-segment replacements and associated kit (resistors, etc.)
tomorrow to convert to a 21st century technology.
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John English |
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| John E. |
| Posted: Fri Feb 16, 2007 5:21 am |
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Quote: So, since this uses the MC14511 driver, which was designed for LED
7-segment
displays, all I have to do is provide resistors to each element and rewire
for a common-cathode LED display, right?
Right.
-- John Fields
A little clarification, please...
I'm all ready to start looking for a CC display, when I look at the data
sheet for MC14511BCP and it has example circuit hookups for both CC and CA.
I thought a driver output was for one or the other "gender", either CC or CA.
Am I reading this right? Can I use either without further need of other
configuration or circuitry? Seems too good to be true...
Thanks,
Dave
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John English |
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| John E. |
| Posted: Fri Feb 16, 2007 5:39 am |
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<http://alldatasheet.net/datasheet-pdf/pdf/11982/ONSEMI/MC14512.html>
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John English |
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| John E. |
| Posted: Fri Feb 16, 2007 5:43 am |
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The data sheet is here:
<http://pdf1.alldatasheet.net/datasheetpdf/view/11976/ONSEMI/MC14511BCP.html>
Due to bug in the data base, the previous link pointed to MC14512...
Thanks,
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John English |
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| John E. |
| Posted: Fri Feb 16, 2007 5:48 am |
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A second reading of the ds shows that, indeed, a transistor is needed to use
a CA display with the MC14511.
[gotta stop these early morning designs...]
--
John English |
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| John Popelish |
| Posted: Fri Feb 16, 2007 11:26 am |
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John E. wrote:
Quote: A second reading of the ds shows that, indeed, a transistor is needed to use
a CA display with the MC14511.
[gotta stop these early morning designs...]
I would do happier with you if you stopped changing thread
titles. |
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| John E. |
| Posted: Fri Feb 16, 2007 3:24 pm |
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Quote: I would do happier with you if you stopped changing thread
titles.
Sorry, I didn't know this caused a break in thread. My reader simply inserts
the re-titled post in the same thread, just with another title. I should have
realized that not all reader apps behave the same.
Sincere apologies. Will avoid temptation in future.
--
John English |
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