What about a motor speed controller, either bought new from a hardware
store, or removed from an old power tool.??
Ira.
On 11/1/2024 11:48 AM, Mac Doktor wrote:
On Nov 1, 2024, at 12:37 AM, gregebert <[email protected]> wrote:
I recently made a clock with similar displays from IEE. I'm worried
about filament stress, so I dont run the seconds for more than a
minute at-a-time. I also have pre-heating , cool-down, and
current-limiting so that the filaments never get a current-surge at
turn-on. Time will tell if they last a long time.
Dropping the voltage on incandescent lamps by 10% increases the life
by a lot. Doing all of the above make it about as foolproof as
possible. I power up my antique Xmas lights up by slowly increasing
the voltage with a variac. Having a box that does all of that for me
would be nice.
Note that I'm using parallel wired festoons connected to a big 12V
exterior lighting transformer and light dimmers are right out because
of the inductive load. There IS such a dimmer but I haven't seen any
for sale for a long time. I actually have one in a portable neon sign
transformer but I don't care to remove it.
Terry Bowman, KA4HJH
"The Mac Doctor"
https://www.astarcloseup.com
"If only you could see what I've seen with your eyes."—Roy Batty,
/Blade Runner/
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