Odd but cool display

[Terry S]

https://www.ebay.com/itm/2-Hewlett-Packard-HP-5082-7500-Numeric-Indicator-Nixie-with-Socket/382998174929?_trkparms=aid%3D888008%26algo%3DDISC.CARDS%26ao%3D1%26asc%3D20131227121020%26meid%3D0867faac69164cad9a31dccc7901ba77%26pid%3D100009%26rk%3D1%26rkt%3D1%26sd%3D372498315978%26itm%3D382998174929&_trksid=p2047675.c100009.m1982

Sorry about the long link. I like these HP displays. Any guesses which controller chip they are using?
They appear they be unmarked.

I intend to bid on these --- thanks in advance for not competing! :-)

Terry

[Terry S]

Yes I get that.... This group's charter includes all vintage display technologies.

On Monday, June 10, 2019 at 11:38:57 AM UTC-5, martin martin wrote:

Those do not look like Nixie’s.  More like LEDs

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[martin martin]

True 

Those old LEDs are often deep red and look very nice.   

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[jb-electronics]

Here is a shorter link: https://www.ebay.com/itm/382998174929

This is quite interesting. It seems that the display unit is quite small, though. Interesting find!

Cheers

Jens

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[gregebert]

I cant figure out why there is a duplicate column of LEDs on the far right side.

The IC is probably a custom BCD-to-segment driver specifically for discrete LEDs. There is only 1 resistor on the board, so the driver IC probably does the current-limiting.

I'm fairly certain the IC is not MOS/CMOS, so it's probably still OK (not damaged by ESD), and it should not be too difficult to reverse-engineer the connector pinout.

If the LEDs are wired in-series, you can estimate the required power-supply voltage by measuring the forward voltage of 1 LED (roughly 2V @ 10mA).

If they are parallel, I would assume 5V operation. The 120 ohm resistor would give 23mA thru an LED that has a 2.2V drop and a 5V supply. See how many LEDs are connected to it.

Nice find, and I hope you win the auction.

[robin bussell]

On 10/06/2019 18:38, gregebert wrote:
> I cant figure out why there is a duplicate column of LEDs on the far
> right side.
>

If you check out the datasheet second page you'll see it's a dot matrix,
not seven seg.

Cheers,
Robin.

[Terry S]

The far right column is part of the matrix as you would expect. It's the column adjacent that seems unusual.  I guess if the decoding is there for it, you could illuminate a + sign with that column.

[David Pye]

I wondered if they are little red cap covered filament bulbs rather than LEDs. But not possible for me to say for sure...

David

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[Terry S]

Ah -- I also see the "1", "4" and "7" characters take advantage of that column, for better formed/placed digits. Very cool.

[Terry S]

The data sheet specifically says LED.

On Monday, June 10, 2019 at 12:55:58 PM UTC-5, David Pye wrote:

I wondered if they are little red cap covered filament bulbs rather than LEDs. But not possible for me to say for sure...

David

On Mon, 10 Jun 2019, 18:50 robin bussell, <ro...@cqr-ltd.com> wrote:

On 10/06/2019 18:38, gregebert wrote:
> I cant figure out why there is a duplicate column of LEDs on the far
> right side.
>
If you check out the datasheet second page you'll see it's a dot matrix,
not seven seg.

Cheers,
       Robin.

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[Charles MacDonald]

On 2019-06-10 7:53 p.m., Terry S wrote:
> The data sheet specifically says LED.

HP at one time made their own LED devices for Calculator and other
displays. Calculators like the HP-35 have HP made LED displays.

eventually - the available devices got better and cheaper and they exited.

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[Benoit Bleau]

While looking for the datasheet if the 5082-7500, I came across these critters which I also find interesting

https://www.ebay.com/itm/1PCS-HP-5082-7340-DIP-8-5082-73xx-Hex/323318410463  

Benoit.

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[Terry S]

I have a whole bunch of those -- for sale/trade.

On Monday, June 10, 2019 at 8:05:57 PM UTC-5, Benoit wrote:

While looking for the datasheet if the 5082-7500, I came across these critters which I also find interesting

https://www.ebay.com/itm/1PCS-HP-5082-7340-DIP-8-5082-73xx-Hex/323318410463  

Benoit.

On Mon, Jun 10, 2019 at 8:02 PM Charles MacDonald <cm...@zeusprune.ca> wrote:

On 2019-06-10 7:53 p.m., Terry S wrote:
> The data sheet specifically says LED.

HP at one time made their own LED devices for Calculator and other
displays.  Calculators like the HP-35 have HP made LED displays.

eventually - the available devices got better and cheaper and they exited.

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[martin martin]

I have some of those HP smart displays.  They are now in an 1980s industrial controller clock!

~

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[John Rehwinkel]

Ah -- I also see the "1", "4" and "7" characters take advantage of that column, for better formed/placed digits. Very cool.

Where do you see that?

- John

[Terry S]

The data sheet in the auction.

[Alex]

That extra right hand column for making nicer looking 1,4 and 7 digits is very novel, I like it. Typical HP!

I have a large collection of Smart DIP dot matrix displays that were in IVAC 572 infusion pumps I stripped for parts, had about 40 pumps over the years and each had 2 x 4 digit 5x7 LED displays in them. The best part, they were socketed :-) I was going to make either a model sized scrolling LED sign or some mini 4 letter word cubes with them, the red led pixel displays have an excellent contrast.

- Alex

[Bill Notfaded]

They're about to sell Terry! If it wasn't you I'd buy 'em. Hopefully you score them.

Bill

[Bill Notfaded]

I hope t***b(1561) was you Terry.

[Terry S]

Alas, it was not, my esnipe came in too late and too low....

[Bill Notfaded]

Awe that sucks I wanted you to get it badly!

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[Tyler Bourne]

I almost had it!  Got sniped in the last couple seconds.

[gregebert]

Considering all of the interest this unique display has generated within this group, has someone other than me thought about making a modern-day clone ?

I'd prefer NE-2 bulbs, but LEDs are much more efficient and easier to drive. 

The extra column of dots on the right-hand side really makes this an original work of art, and as far as I can remember I've never seen this exact type of display before.

As much as I want to do this project "right now" I have to stay focused on my current backlog.

[John Rehwinkel]

> I'd prefer NE-2 bulbs, but LEDs are much more efficient and easier to drive.

LEDs aren’t really much more efficient, especially if you already have an appropriate source of voltage to drive the NE-2s.

- John

[Terry S]

Very easy to do with a 22V10 or similar. or even just  an eprom.