there are
millions of old
monitors .... filled endlessly with
LEDs in it
>
while not as efficient
as the new generation
> but good enough for low lighting needs !
above all ... the other
construction parts >
power
diodes > capacitors and resistors ....
are in there to be found !
so here .... we
have the power in
... then
the protective
resistance >
Rs>
of the
switch on current limiting >
to a couple of amps! ... for the diodes
not being destroyed ... 50
on 120 v ... 100 ohm on 240 v in ....
then the CR balast capacitor>
in the simple rectification
~ 15ma
led power ....
240v ~ 50 hz
.... a
1/2 uf 400v / 250v ~
at the
bridge rectification
you will have
then as well
> 15ma at 120v ~ at 60 hz > ~ 20ma at both
then the
diodes > from the power
supply + the leds
of the monitor
setting
> ~ 6x
yellow led ~
12 volt
then the
load capacitor>
CL > mainly for switching on
current limiting
> since he will have to be
charged
first .....
about 10uF
16v >
because those
may fail > best to install 2
> or
if available tantalum!
since such are
for decades
reliable .....
such a lamp then
... will give enough light for example at a toilet .... or a light for walking
through a room !
of course you can as
well at any time > use new
leds to install!
only then you have to
select the CL
with a higher voltage ....
the physical realization
will work with an old
fluorescent "energy saving lamp " for example >
just remove the
fluorescent element >
then the 6x
led build into the opening of this .....
after the original
circuit being changed
> or all new .....
fritz roth
galactic design
galactic design org
galactic central information