Regarding using the 74HC595s, it's true that they are technically out of
spec if too many segments are on, but I believe the failure cause would be
whole chip heating rather than the single output transistors, and
especially with the PWM dimming going on (the segments are never on 100%,
since
If they were tested and guaranteed that would be one thing, but throwing a
bunch of these in a box as-is and charging top dollar probably won't get
them moving any time soon...
On Wed, Aug 17, 2022, 7:24 PM gregebert wrote:
> Seller is probably testing the waters to see if anyone take a BIG
Seller is probably testing the waters to see if anyone take a BIG bite.
Next step is to break-up into smaller lots.
On Wednesday, August 17, 2022 at 3:48:27 PM UTC-7 Jeff Walton wrote:
> Remembering some older surplus places prior to the internet.
>
> Polypaks was one of them that had a
Remembering some older surplus places prior to the internet.Polypaks was one of
them that had a printed flyer or ads in the back of electronics magazines. They
often displayed this disclaimer with some of their products, "... No time to
test 'em!" Of course, B-7971's were two for $8 with the
Some people like to put all the risk onto the buyer. I tend to not deal
with people like that.
On Wednesday, August 17, 2022 at 3:37:15 PM UTC-7 tntm...@gmail.com wrote:
> Yeah. It's silly to sell them all as one lot, and even sillier to not
> figuring out how to test them for that
Yeah. It's silly to sell them all as one lot, and even sillier to not
figuring out how to test them for that pricepoint...
On Wed, Aug 17, 2022, 6:30 PM Michail Wilson wrote:
> Quite the number of tubes.
>
> Since he is asking retail for them all, and not likely too many people
> want or can
Quite the number of tubes.
Since he is asking retail for them all, and not likely too many people want or
can afford that many, I asked if there was a guarantee since if even 1 could be
bad, it would make almost the entire order non-profitable. Awaiting a response.
Michail
From:
I’ve had great experience with the TPIC6B595s, I used them to drive a whole
bunch of miniature bayonet style bulbs for a clock using IEE one plane
readouts, no problems with them so far. Probably a little over 120 mA per IC.
> On Aug 17, 2022, at 8:12 PM, Christian Riise Wagner
> wrote:
>
>
Let's keep the forum non-political please. It's bad enough out there as it
is... :)
Nick (Mod)
On Wed, Aug 17, 2022 at 11:23 AM Nick Andrews
wrote:
> Must be someone in CONgress...
>
> On Wed, Aug 17, 2022 at 1:00 PM 'Ian Vine' via neonixie-l <
> neonixie-l@googlegroups.com> wrote:
>
>>
>> OK
Must be someone in CONgress...
On Wed, Aug 17, 2022 at 1:00 PM 'Ian Vine' via neonixie-l <
neonixie-l@googlegroups.com> wrote:
>
> OK $191 per untested tube! Bit hot.
>
> Ian
> On Wednesday, 17 August 2022 at 18:29:48 BST, Audrey
> wrote:
>
>
> not my listing obviously..
>
Even running more than 3 segments @20mA is actually out of spec as the
maximum ground and source current for the 74HC595 is 70mA. I found that it
didn't work satisfactory for an IV-19. Too high a voltage drop. Might be
okay for smaller numitrons though. I've ordered some TPIC6C595 instead to
Yeah who knows, I've seen a few with cracks and outgassed from improper
storage.
On Wed, Aug 17, 2022, 2:00 PM 'Ian Vine' via neonixie-l <
neonixie-l@googlegroups.com> wrote:
>
> OK $191 per untested tube! Bit hot.
>
> Ian
> On Wednesday, 17 August 2022 at 18:29:48 BST, Audrey
> wrote:
>
>
>
OK $191 per untested tube! Bit hot.
IanOn Wednesday, 17 August 2022 at 18:29:48 BST, Audrey
wrote:
not my listing obviously..https://www.ebay.com/itm/354229991047
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not my listing obviously..
https://www.ebay.com/itm/354229991047
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Don't numitrons have pretty high shoot-through current? I'd expect 100mA of
current going into the IC pins at each off-on transition. Which would
probably be fine since it's only for a few milliseconds and as you
mentioned it's been fine for years, but it's technically out of spec.
On Monday,
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