Good outcome. I wondered what had happened.
Saw what you meant as soon as I looked at the docs. At least you know what
tweaks to do if anymore funnies turn up [ageing, temperature etc].
You can often scavenge the old parts from recycling centres if they haven't
actually chewed up the boards for metal extraction.
I am sure that all the boards we see leaving here for the Philipines get
components pulled and sold on ebay.
I regret putting off getting a bigger selection of spares for all my
'interesting' old junk - like Data General Novas.
John K.
----- Original Message -----
From: dave.do...@comcast.net
To: neonixie-l
Sent: Friday, March 31, 2017 11:55 AM
Subject: [neonixie-l] Re: Taylor Edge Nixie Clock Kit
Sorry that it took me so long to get back about this clock problem. We have
the clock work perfectly now. I have to give my friend Mike all the credit for
figuring this out. It appears that the original clock design schematic calls
for 7400 series ICs but the BOM calls for 74LSXX. Mike has a IC spec. book and
after comparing the differences in the ICs we found that the 74LSXX have an
output of 8ma and the 7400 series have an output of 16ma. We believe that the
original design was for 7400 but in shopping for them found that there are very
few suppliers anymore. We think that this is why they changed the BOM to
74LSXX. With the smaller output from the 74LSXX IC and the amount of resistance
in that circuit the current was marginal and not enough current to drive the
other ICs correctly in the circuit. We ended up removing R1 and R3 (360 ohm)
and leaving everything else the way it was. It works perfect now and all of the
setting switches work fine also. Thanks for all the feedback from everyone
Dave
On Tuesday, March 7, 2017 at 6:37:54 PM UTC-6, dave....@comcast.net wrote:
I'm hoping that someone out there can help me with a problem that I am
having with a Taylor Edge clock kit that I built. After completing the kit and
plugging it in it seemed to be working fine. Then I noticed that the 10s second
display tube and the 10s minute display tube were not counting correctly. They
would count from 2 to 3 to 4 to 5 but then it would go back to 3 then 4 then
back to 2 and then start the sequence over again. The 1s second and 10s minute
tubes would count fine. I asked a friend of mine that knows a lot more about
this stuff than I do and he recommended that I try disconnecting resistors R13
and R15 (both 240 ohm) from the time setting circuit to see what would happen.
This fixed the counting problem but now I cannot set the time. I can't believe
that I am the only person that has had this problem and am hoping someone out
there knows the answer. I am attaching the schematic.
Thanks
Dave
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