I have friends who I built Tubehobby clocks for over 10 years ago (multiplexed
design) that are still going strong with both IN14 and IN18 tubesI think
the concerns about multiplexing aren't worth worrying too much about (IMHO).
Nick
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> On Jul 16, 2021, at 16:01, ZY wro
Do you use PWM at all for dimming, or do you control the tube voltage? I do
find that my IN-18s sing a bit at certain PWM settings so I've wondered too
if that would have a negative effect.
In terms of motion sensing, I did add that feature to a recent build I did
but I was curious if the therm
>From what I've read, the peak current is what leads to tube wearout, and
the effect is exponential: double the current, and the lifetime will be
less than half the normal expectancy. So when a tube is pulsed, such as
with multiplexing, the perceived brightness will always be lower compared
to
Ooops, sorry Gregebert, I'm not experienced with google groups and I didn't
know the difference between reply to group vs. reply to author.
I'm going to repeat my question so it's group visible:
Basically I was wondering for multiplexed vs direct drive, if given the
same voltage and current li
It's also worth mentioning that with a multiplexed design it's easy to dim
the tubes for a dark room and obviously extend the life.
I have a bedroom arduino-based clock that has 4x NL5780 multiplexed.
The brightness auto-dims so that it's nice at night (and at a level that
would be invisible duri
@gregebert...
I never considered that... Always looked at the K155ID1 chips as the
expensive part... But you make a very good point. The tubes are getting
more expensive by the day
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Makes perfect sense. Thank you for the explanation. Think I'll be going
down the direct drive route for my designs.
On Tuesday, 13 July 2021 at 14:43:30 UTC+10 gregebert wrote:
> If you use 1 decoder for 6 tubes, the duty-cycle is 1/6 and it will
> require more current to get the same brightnes
If you use 1 decoder for 6 tubes, the duty-cycle is 1/6 and it will require
more current to get the same brightness as a tube with a higher duty-cycle.
So, if you use 2 decoders, the duty-cycle is 1/3 and the peak current will
be less vs 1/6 duty cycle.
Personally, I never multiplex tubes becau
