Odd 7-segment display

[John E.]

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,

 

[Michael A. Terrell]

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,

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

 

[Michael A. Terrell]

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,

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

 

[rebel]

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.

 

[John E.]

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 Fields]

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?

 

[Homer J Simpson]

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?

Does it heat up? Voltages?



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[Arfa Daily]

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

 

[James Sweet]

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.

 

[John E.]

James Sweet sez:

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.

 

[John E.]

So, since this uses the MC14511 driver, which was designed for LED

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

 

[John E.]

<http://alldatasheet.net/datasheet-pdf/pdf/11982/ONSEMI/MC14512.html>

 

[John E.]

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,

 

[John E.]

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 Popelish]

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.

 

[John E.]

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.

 

[Homer J Simpson]

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.

Most readers use the message ID and work correctly.


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[John Popelish]

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.

I appreciate it. It is not so much a problem with broken
threads, for me, as much as it is that I remember the thread
title of threads I have been reading. When you change the
thread title, I have to go back and review earlier messages
to remember what subject we are talking about.

 

[Andrew Gabriel]

Sounds like a Numitron incandescent filament display. These are getting
very hard to come by.

They used to be popular in petrol pumps in the UK (they are
readable in quite bright sunlight).

 

[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...

---
It is. [too good to be true]

The device, by itself, is designed to drive a common cathode display
as shown in the upper left hand corner on page 6 of this data sheet:

http://www.onsemi.com/pub/Collateral/MC14511B-D.PDF

Immediately across the page from it is the common anode
configuration, which requires an additional transistor and resistor
_per segment_ .