You forgot the other pro's:
- reduced power consumption
- dramatically increased tube life at equal cathode current.
--
The point is that there isn't a "right" answer or a religious opinion.
To multiplex or not is really a design decision which should be made
based on your product requirements. I own (and have designed) both
multiplexing and non-multiplexing clocks. I tend to lean towards
multiplex for the "cheap & easy" clocks and towards direct-drive (with
cross-fade PWM, etc) for the "deluxe" clocks.. but to each their own. In
the case of VFD clocks, I can heartily recommend multiplexing. The fact
that VFD's are triodes makes multiplexing a breeze.. and they are so
bright anyways, I can't imagine what they would look like direct driven.
-Adam
On 9/20/2012 10:37 AM, Jeff Thomas wrote:
On Wednesday, September 19, 2012 6:39:22 PM UTC-7, dr pepper wrote:
So why is multiplexing a bad idea, and static displays make tubes
last
longer?, does multiplexing accelerate cathode poisoning or something?
I have 3 or 4 prototypes I've put together and they all use
multiplxing, even the single tube ones use pwm as a brightness
control
(and so probably inherit the 'bad habits' too).
Pro's: Reduced component count.
Cons: Significantly reduced brightness in comparison to direct drive
at equal cathode current. Visible flicker- like POV, accentuated at
periphery of vision. Audible noise, or buzzing.
PWM with direct drive is also a common feature of many clock designs
to control display brightness.
Regards, Jeff
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