Hi Michel,
the 6mA confuse me:
Even if your batteries supplied 12V, that gives you P = 12V x 6mA =
72mW. The tubes need at least 1mA at 150V (very conservative again),
which makes it P' = 2 x 1mA x 150V = 300mW.
Do you see my confusion? For that to work, your switching mode power
supply would have to have an efficiency larger than 100% ;-)
Your 20mA seem much more plausible. Are you sure you measured the
current correctly, or am I missing something?
Best regards,
Jens
Thanks everybody! I'm going to wear this watch 24 hours a day once
finished :-) Have been looking forward to that for about 3 months now
since I came up with this plan.
Interestingly, I am not even surprised by the efficiency of the
circuit (I had predicted 80% - 90% in one of my first posts). The
thing that surprises me most is that you can actually run these tubes
on just 6mA battery current (I had predicted 20mA, so I was way to
conservative). Don't you think that is amazing? 6mA? The tubes look
very dark in the video at this low current, but honestly, if you walk
outside at night they appear just bright enough.
Michel
On Apr 12, 11:16 pm, Lucky<[email protected]> wrote:
Great little taster (or should that be 'teaser') Michel, look forward to
seeing you develop it further, must be great seeing it finally take shape.
On Thursday, 12 April 2012 09:50:39 UTC+8, Cobra007 wrote:
I had a bit of time this week to get the first module working. It's
not finished yet, at the moment it only counts from 00 to 59, but for
as long as that works, the rest is just a bit of coding.
This video shows the tubes at maximum brightness (which is about 2mA
DC average per tube @ 200mA battery current), and afterwards at
minimum brightness @ 6mA battery current. Efficiency is about 85% and
since I don't use resistors in the HV circuit, all this power is
converted into tube power (and a bit for the blue LEDs).
http://www.youtube.com/watch?v=AklybAgVMmk
Michel
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