28 Aug
2014
28 Aug
'14
4:58 p.m.
Altair update - upon further testing, I detected 4 bad 74123 chips on the
D/C panel.. that's 4 out of 5. I didn't even trust the remaining 'good'
part so i chucked it and replaced all the '123s with new stuff. Luckily, I
+did+ have those on-hand.
That front panel must have really suffered a calamity, and now I'm
suspecting the glue logic on the CPU board as well. So I've set up the
proto-tester again, and I'm running through all the chips on the CPU board
- it's mostly 8T97 aka 74LS367 tri-state buffers.
This thing +WILL+ work again.. =)
On Thu, Aug 28, 2014 at 6:51 PM, drlegendre . <drlegendre at gmail.com> wrote:
Sorry Mike, I totally mis-spoke! I meant to say
"Numitron" rather than
Nixie - another moment of confusion..
A few (if not all) of the DIY Numitron clocks use the 5314N as the heart
of the design - while it was most likely designed with LEDs in mind, it
works with any 7-seg displays and it doesn't mind the higher current of the
Numitron parts. I built a couple of these clocks two years ago, after I'd
stumbled into 30-40 of the 5314N chips.
I traded a slug of chips to a guy who sold clock kits on the web in
exchange for two of his very nice kits & cases. He was out of chips and
couldn't source any - I was able to supply enough that he could complete
the BOMs and sell his remaining kit stock. Worked out well, though I did
have to send a few replacements as there were bad parts in the lot.
Kind of a hard chip to test, unless you already have a clock that uses one!
On Thu, Aug 28, 2014 at 12:48 PM, MikeS <dm561 at torfree.net> wrote:
----- Original Message -----
Date: Wed, 27 Aug 2014 17:49:32 -0500
From: "drlegendre ." <drlegendre at gmail.com>
..,.For swaps, I have ... a couple of MM5314N
display drivers, as used in Nixie tube clocks - the latter sell for
$20-25/ea, IIRC.
----- Reply:
My MM5314Ns are digital clock chips, not display drivers, and they have 7
segment outputs not really suited for Nixie tubes at all...
m