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<DocScrutinizer05>
looks good, but only looks...
<DocScrutinizer05>
if you wouldn't try to make it auto-rollup, and not insist in it being vertical, it would actually be usable as a *movable* alternative to toolbox
<DocScrutinizer05>
this way it's more like a geeky shelf, not meant to get moved anywhere else than where it is
<DocScrutinizer05>
3 bucks? still worth it, but only for experts ;-P
<wpwrak>
i guess if you dunk is first in silicone, it'll be a lot safer :)
<DocScrutinizer05>
definitely not, it will catch fire in no time
<wpwrak>
well, there are some high-temperature formulations ...
<DocScrutinizer05>
but you could e.g. mount it on a non-grounded power line (transformer), or a power line with a proper RCD, or simply out of reach of anybody, in 6m height
<DocScrutinizer05>
or parallel the whole 14V LEDs (with tiny series Rs) and operate the whole thing at 12V
<wpwrak>
heh :)
* DocScrutinizer05
thought those HV-LEDs were 22V or somesuch
<DocScrutinizer05>
ooooh, wait
<DocScrutinizer05>
graetz rectifier, buffer C
<DocScrutinizer05>
~400/16
<DocScrutinizer05>
!400/16
<DocScrutinizer05>
25 :-)
<DocScrutinizer05>
16*22=352
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<DocScrutinizer05>
btw it's way less dangerous than that guy claims it was - you are on life wire only with a duty cycle of 50%
<DocScrutinizer05>
;-P
<DocScrutinizer05>
then you get at least 20ms to open your grip and get away from that thing that bites you
<DocScrutinizer05>
then otoh it's intermittant DC, and despite what Edison always tried to make the world believe, DC is way worse than AC
<DocScrutinizer05>
AC won't create effective electrolysis, and won't operate but paralyze nerves
<DocScrutinizer05>
DC can break your bones and make your skin look like bubble foil
<DocScrutinizer05>
one end filled with H2, the other with O2
<DocScrutinizer05>
AC basically just burns your skin and tissues
* DocScrutinizer05
needs to get a few frog legs ;-P
<wpwrak>
a plan B if you can't source a good motor for the vibration alarm
<DocScrutinizer05>
galaxy S5: IP67 :-o
<sb0>
this thing reminds me of a cheap transformer-less "1.7kW 220V -> 110V" adapter that fit in the palm of one hand
<sb0>
it warned against connecting to sensitive equipment like computers, and said it was only good for hairdryers and such
<sb0>
I wonder how it's supposed to work (or not)
<DocScrutinizer05>
LOL
<DocScrutinizer05>
diode
<sb0>
yeah :)
<sb0>
so if you put at transformer at the output, you get DC through it?
<DocScrutinizer05>
hehe
<DocScrutinizer05>
probably you can choose which direction the fan in the hairdryer spins, by rotating the mains plug 180°
<DocScrutinizer05>
;-P
<DocScrutinizer05>
and yeah, motors and transformers LOVE dc
<DocScrutinizer05>
it might work for plain braindead heaters
<DocScrutinizer05>
without motor
<DocScrutinizer05>
but hey, maybe it been "smart" and "muted" every second full sine wave
<DocScrutinizer05>
or it simply been a dimmer
<sb0>
in that case, the full voltage of a complete sine wave will saturate the transformer of any 110V device connected to it and also cause a disaster
<DocScrutinizer05>
then it actually *could* work with transformers and AC motors too, at least with some of them
<DocScrutinizer05>
yep, usually it will
<DocScrutinizer05>
saturated trafo is a nasty thing
<sb0>
I've actually tried to push the voltage of mains transformers
<sb0>
they don't like that
<DocScrutinizer05>
it's usually a sure kill
<sb0>
they begin seriously saturating at like 20% more of the rated voltage
<DocScrutinizer05>
yep
<sb0>
switching power supplies will also fail badly
<DocScrutinizer05>
dunno what's happening to toroid trafos then
<sb0>
well, maybe not if it's a dimmer
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<DocScrutinizer05>
actually no, you *can* operate trafos with phase kickin dimmers, not though with phase cutoff dimmers (the new stuff) which are needed for any electronics like LED lamps
<DocScrutinizer05>
and for SPSU it's the question which PFC you got in them, but most of those can do 220V anyway, so any such nonsensical "comnverter" not needed
<DocScrutinizer05>
LED lamps have a SPSU with no PFC at all, and they work finbe with cutoff dimmers
<DocScrutinizer05>
fine*
<DocScrutinizer05>
most of them do, at least
<DocScrutinizer05>
some start flickering
<DocScrutinizer05>
and some few LED lamps actually have a PFC and can cope with classical kick-in dimming
<sb0>
what's wrong exactly with transformers and kick-in dimmers?
<sb0>
I never read a good explanation for that
<sb0>
kick-in is when you apply the voltage suddenly within a sinusoid arch, right?
<sb0>
while cut-off is when you apply the start of the arch, then switch off
<sb0>
I'd actually tend to think that classical (kick-in with triac) dimmers would work, but cut-off won't
<DocScrutinizer05>
transformers and kick-in dimmer usually works
<DocScrutinizer05>
cut-off doesn't since it was the same like your age old car engine ignition
<DocScrutinizer05>
the exact inverse algo applies to PSU with rectifier and buffer C, they don't like it much when you apply 300V out of nothing to a discharged buffer C 100 times a second
<DocScrutinizer05>
while they usually tolerate sudden reduction of input voltage to 0
<DocScrutinizer05>
thus cut-off for those
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<DocScrutinizer05>
kick -in for inductive loads
<DocScrutinizer05>
and a decent PFC shouldn't mind either of both
<roh>
yep. basically you just designe for 'worse power' and dim the output voltage proportional to the input
<roh>
-e
<roh>
needs a few cent more for better/more parts. thats the 10% a dim-able led lamp costs in the end
<DocScrutinizer05>
well, a PFC basically emulates a resitive load, by doing buck/boost with no significan input buffer capacitor
<DocScrutinizer05>
the only capacitive component is the RF-filter capacitor to filter away trhe x MHz switching from the PFC
<DocScrutinizer05>
on input
<DocScrutinizer05>
on output side it has a usual huge buffer capacitor for the main SPSU
<DocScrutinizer05>
so a SPSU with PFC are basicall two SPSU in series
<DocScrutinizer05>
with hte first one controlled by input voltage resp current, rather than output voltage
<DocScrutinizer05>
si Vin/Iin is constant
<DocScrutinizer05>
so*
<DocScrutinizer05>
whicj happens to be the definition of a resistive load
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<DocScrutinizer05>
I have a FL energysaver lamp that works with kick-in dimmers. dunno what exactly they do
<roh>
same thing. just ac on the secondary
<roh>
or high-voltage dc and some startpulse
<DocScrutinizer05>
yeah, prolly they simply use the "PFC" style SPSU only, to limit the current that flows through the FL, no matter what#s the voltage across FL
<DocScrutinizer05>
basically a series inductance as in classical FL circuits, just much smaller inductor and a FET or whatever to PWM the current