Re: [neonixie-l] Just wow.... https://www.ebay.com/itm/274654341777

[Nick Andrews]

Hmm, maybe you should send some of those spares to me for safe keeping
then, in case of natural disaster there...

On Tue, Jan 26, 2021 at 10:48 AM jf...@my-deja.com 
wrote:

> On Monday, January 25, 2021 at 9:30:49 PM UTC-8 gregebert wrote:
>
>> Interesting notes from the seller, mentions slight ghosting. The
>> clock-chip does the multiplexing, though it was probably intended for LEDs
>> which dont have requirements for blanking time.
>
> The chip is a National Semiconductors MM5314.  I have a Panaplex
> evaluation kit that used this chip, and I do not remember seeing any
> ghosting (and the Panaplex and B7971 were both made by Burroughs).
>
> My B7971 clocks used the Cal-Tex CT7001 which multiplexes with 120µs ON
> followed by 40µs OFF.  You can see ghosting, even on some of the segments
> that were not wired (floating). Must be due to some parasitic capacitance
> somewhere.
>
>
>
>> Downright scary how much the 7971's are selling for...
>>
> I still have a bunch of spares (none of my 7971's died of natural causes,
> so I have lots).  I am rooting for the price to go up to help fund my
> retirement.
>
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> .
>

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Re: [neonixie-l] Just wow.... https://www.ebay.com/itm/274654341777

[jf...@my-deja.com]

On Monday, January 25, 2021 at 9:30:49 PM UTC-8 gregebert wrote:

> Interesting notes from the seller, mentions slight ghosting. The 
> clock-chip does the multiplexing, though it was probably intended for LEDs 
> which dont have requirements for blanking time.

The chip is a National Semiconductors MM5314.  I have a Panaplex evaluation 
kit that used this chip, and I do not remember seeing any ghosting (and the 
Panaplex and B7971 were both made by Burroughs).

My B7971 clocks used the Cal-Tex CT7001 which multiplexes with 120µs ON 
followed by 40µs OFF.  You can see ghosting, even on some of the segments 
that were not wired (floating). Must be due to some parasitic capacitance 
somewhere.

 

> Downright scary how much the 7971's are selling for...
>
I still have a bunch of spares (none of my 7971's died of natural causes, 
so I have lots).  I am rooting for the price to go up to help fund my 
retirement.

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Re: [neonixie-l] Just wow.... https://www.ebay.com/itm/274654341777

[gregebert]

Interesting notes from the seller, mentions slight ghosting. The clock-chip 
does the multiplexing, though it was probably intended for LEDs which dont 
have requirements for blanking time.

The PC board is typical of consumer products: single-sided phenolic. Even 
do-it-yourself PCB kits used epoxy boards.

Downright scary how much the 7971's are selling for...

On Monday, January 25, 2021 at 7:16:13 PM UTC-8 Pramanicin wrote:

> Indeed...
>
> Sent from my iPhone
>
> On Jan 25, 2021, at 18:58, Michail Wilson  wrote:
>
>  
>
> https://www.ebay.com/itm/274654341777
>
>  
>
> Someone got a great deal.  I missed it by seconds.
>
>  
>
> Michail
>
>  
>
> -- 
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>  
> 
> .
>
>

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Re: [neonixie-l] Just wow.... https://www.ebay.com/itm/274654341777

[Nicholas Stock]

Indeed...

Sent from my iPhone

> On Jan 25, 2021, at 18:58, Michail Wilson  wrote:
> 
> 
> https://www.ebay.com/itm/274654341777
>  
> Someone got a great deal.  I missed it by seconds.
>  
> Michail
>  
> -- 
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[neonixie-l] Just wow.... https://www.ebay.com/itm/274654341777

[Michail Wilson]

https://www.ebay.com/itm/274654341777

Someone got a great deal.  I missed it by seconds.

Michail

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