Re: [neonixie-l] Odd but cool display

[martin martin]

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



~
*mcvei...@gmail.com *


On Mon, Jun 10, 2019 at 6:05 PM Benoit Bleau  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 
> 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.
>>
>> --
>> Charles MacDonald Stittsville Ontario
>> cm...@zeusprune.ca  Just Beyond the Fringe
>> No Microsoft Products were used in sending this e-mail.
>>
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Re: [neonixie-l] Odd but cool display

[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  > 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.
>>
>> -- 
>> Charles MacDonald Stittsville Ontario
>> cm...@zeusprune.ca   Just Beyond the Fringe
>> No Microsoft Products were used in sending this e-mail.
>>
>> -- 
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>> .
>> For more options, visit https://groups.google.com/d/optout.
>>
>

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Re: [neonixie-l] Odd but cool display

[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.

On Mon, Jun 10, 2019 at 8:02 PM Charles MacDonald 
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.
>
> --
> Charles MacDonald Stittsville Ontario
> cm...@zeusprune.ca  Just Beyond the Fringe
> No Microsoft Products were used in sending this e-mail.
>
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Re: [neonixie-l] Odd but cool display

[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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cm...@zeusprune.ca  Just Beyond the Fringe
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Re: [neonixie-l] Odd but cool display

[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, > 
> 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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Re: [neonixie-l] Odd but cool display

[Terry S]

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

On Monday, June 10, 2019 at 12:55:47 PM UTC-5, Terry S wrote:
>
> 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.
>
> On Monday, June 10, 2019 at 12:38:49 PM UTC-5, gregebert wrote:
>>
>> 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.
>>
>

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Re: [neonixie-l] Odd but cool display

[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

On Mon, 10 Jun 2019, 18:50 robin bussell,  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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Re: [neonixie-l] Odd but cool display

[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.

On Monday, June 10, 2019 at 12:38:49 PM UTC-5, gregebert wrote:
>
> 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.
>

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Re: [neonixie-l] Odd but cool display

[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.

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Re: [neonixie-l] Odd but cool display

[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.

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Re: [neonixie-l] Odd but cool display

[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

On 2019-06-10 10:31 a.m., Terry S wrote:

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%3D19%26rk%3D1%26rkt%3D1%26sd%3D372498315978%26itm%3D382998174929&_trksid=p2047675.c19.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
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Re: [neonixie-l] Odd but cool display

[martin martin]

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


On Mon, Jun 10, 2019 at 09:44 Terry S  wrote:

> 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
>>
>> On Mon, Jun 10, 2019 at 09:31 Terry S  wrote:
>>
>>>
>>> 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%3D19%26rk%3D1%26rkt%3D1%26sd%3D372498315978%26itm%3D382998174929&_trksid=p2047675.c19.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
>>>
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>>>
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Re: [neonixie-l] Odd but cool display

[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
>
> On Mon, Jun 10, 2019 at 09:31 Terry S > 
> wrote:
>
>>
>> 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%3D19%26rk%3D1%26rkt%3D1%26sd%3D372498315978%26itm%3D382998174929&_trksid=p2047675.c19.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
>>
>> -- 
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>> 
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Re: [neonixie-l] Odd but cool display

[martin martin]

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

On Mon, Jun 10, 2019 at 09:31 Terry S  wrote:

>
> 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%3D19%26rk%3D1%26rkt%3D1%26sd%3D372498315978%26itm%3D382998174929&_trksid=p2047675.c19.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
>
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[neonixie-l] 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%3D19%26rk%3D1%26rkt%3D1%26sd%3D372498315978%26itm%3D382998174929&_trksid=p2047675.c19.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

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[neonixie-l] Re: Help with Nixichron Issue

[David Fleig]

I switched to a different power supply and it's been running fine so far.  
If it happens again I'll try the cap.

Thanks,
David

On Sunday, June 2, 2019 at 6:09:23 PM UTC-4, Terry Kennedy wrote:
>
> On Sunday, June 2, 2019 at 4:44:05 PM UTC-4, David Fleig wrote:
>>
>> I've got a Nixichron purchased from Jeff Thomas years ago that's not 
>> behaving.  It starts up and runs fine for several hours or even a few days 
>> then starts emitting a continuous beep and the display goes blank.  
>> Unfortunately, it's random enough that no ones seen it actually happen, we 
>> just hear it.  Unplugging it and plugging it back in fixes the problem 
>> until it happens again.  Jeff had fixed this issue a couple times for me 
>> but I never got the details on what he did.  I've looked over the board and 
>> don't see anything obviously wrong.  I've also pulled the processor and 
>> level-shifters out, cleaned the terminals and replaced them but it hasn't 
>> helped.
>>
>
> I have one that used to do that a lot. Updating to the latest firmware 
> (from MichaelB) helped somewhat, but putting it on a UPS seems to have 
> solved the issue. Based on that, I suspect that some power glitches are 
> latching up the power-on reset logic in the clock. Fitting a large-value 
> capacitor across the power input may help (you can test this on a 
> disposable power adapter, rather than opening the clock up again).
>

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