220v=lighting of led(wat resistor use?)

[Woots29]

heheh lighter

[insomartin]

hindi ba dapat advice natin c alphatu_24 para paano yung TAMANG paraan para mag pailaw nang SIMPLENG LED. yung nasa rating at nasa datasheet. malamang most of us is a certified professional and properly trained technician.

<<<hobbyist po ako.

[Woots29]

oo, pero there are so many tricky tips to light a LED
and some of them break the common theories we know.

[skyrus_09]

tsaka more info from sir alpha. kung saan gagamitin, for project ba or purely experiment lang? or biznes kaya? para mas specific and advice ng mga masters

hindi ba dapat advice natin c alphatu_24 para paano yung TAMANG paraan para mag pailaw nang SIMPLENG LED. yung nasa rating at nasa datasheet. malamang most of us is a certified professional and properly trained technician.

<<<hobbyist po ako.

[insomartin]

kasi ganito... imagine. magdridrive ka lang nang led kailangan mo pa nang constant current driver para sa mga high powered led. static sensitive din ang LED, sa isang bag nang white leds. kapag nasira yung led nagiging bluish yung color nya rather than white. meaning reject agad yun. (yun yung pang china na lighters and flashlights kasi nagana pa. bluish nga lang kya cheap)

[Woots29]

so what is your suggestion?

and why in stores sell LEDS even super bright are not packaged in a ESD proof plastic?

[insomartin]

so what is your suggestion?

and why in stores sell LEDS even super bright are not packaged in a ESD proof plastic?

eh kahit naman esd sensitive na ICs hindi naka esd container.. (deeco's bad behavior and take note nakatusok pa sa styro yung LEDS) pero kung kukuha ka nang 1000's naka esd proof. minsan tubing pa.

my point is diba dapat i isolate sa 220V line yung leds. rather than giving advise na kung ano yung voltage drop nang 220 eh "pwede na" unethical yung ganung design. mahirap din makakuriente at makasunog diba?

i work and designing high power LED for indoor signs, ayaw na nang malls yung 15,000 volt neon sign, eh usually nakalagay pa sa ACRYLIC plastic yung neon. which is hindi naman fire retardant. i think mas nakakatakot na malaman natin these days na "may nag run nang led direct sa line." masarap isipin na yung mga safety na christmas lights na LED eh hindi directly powered from 220v unlike the tivoli lights tig 50 lang.

"try to consider po" magdedesign ka ba nang MCU na direct sa 220v line na hindi isolated? PARA wala nang psu na maayos?

[Woots29]

hehehe

good point.

pero for me depende sa paggamitan. engineers have secrets

im a tech. pero i understand some things. 

[ultrasonic™]

baka gusto nya replaced yung mga incandescent bulb with white LED's na...

oo nga  baka ganun  para makatipid xa         

[Kasamiko]

Hmmm....i think mas maganda siguro before asking a certain ckt dapat meron requirements?

like...

I need a "simple" white LED driver powered by 220VAC..with 90% efficiency, line isolated with 100kv insulation, on a fire retardant plastic casing UL certified and 0.5% tolerance components with ISO 9001 compliance, can be done using common tools and by a simple hobbyist..

Ayan mas klaro at kumpleto...

[insomartin]

@kasamiko.
don't forget the Rohs hahahahaha pb free!
bibili na nga lang ako nang bulb ke ACE hardware.
or yung 220 na rope light.
it's everyone's pov.

i don't compromise.

[Woots29]

anu ba yan, gagawin bng export quality ito? hehehe

nakakalula

[insomartin]

joke lang. hahahaha who knows.

[zer0w1ng]

my point is diba dapat i isolate sa 220V line yung leds. rather than giving advise na kung ano yung voltage drop nang 220 eh "pwede na" unethical yung ganung design. mahirap din makakuriente at makasunog diba?

The OP explicitly required the value of resistor to use in series for the LED on 220V.
Mostly this is used as a power lamp on switches.
And its not "unethical", a neon bulb instead of the LEDs on this application works the same way and one could still be electructed if touched.  Isolated or not, safety depends on the construction.

"try to consider po" magdedesign ka ba nang MCU na direct sa 220v line na hindi isolated? PARA wala nang psu na maayos?

MCUs on hot line (220V) are very common in X10 applications, TRIAC controllers and such.
http://ww1.microchip.com/downloads/en/AppNotes/00954A.pdf
http://ww1.microchip.com/downloads/en/AppNotes/00236a.pdf

[insomartin]

@zer0w1ng
SAFETY DEPENDS on the Construction as you have said. then why don't we just use a transformer instead. it's simple as that.
unethical kasi it's not designed to run on it. i understand X10 kasi it recieves signal on the same powerline and such. but putting MCUs on hot line has it's disadvantages. on the sense of the totally crosscutting and sobrang murang way to run these i rest my case and this is way to go.

buy the way, i still use my neon bulb line tester with 1mohm in series. yung tig 20 pesos sa banketa. i understand your concerns.

[insomartin]

http://www.physics.ohio-state.edu/~p616/safety/fatal_current.html

"While any amount of current over 10 milliamps (0.01 amp) is capable of producing painful to severe shock, currents between 100 and 200 mA (0.1 to 0.2 amp) are lethal. Currents above 200 milliamps (0.2 amp), while producing severe burns and unconsciousness, do not usually cause death if the victim is given immediate attention. Resuscitation, consisting of artificial respiration, will usually revive the victim."

SChema nang bulb tester sa kalye.

ACprobe<----||----^^^^----|AKO
                 neon   1mohm

[Woots29]

ung controller ng mga parol sa pampanga, may MCU direct live ang psu.hehehe, pero di nmn nasisira

[zer0w1ng]

In the manufacturer's point of view, a transformer costs 1000x or more than a resistor.

My point is that putting an LED into the 220V line is as much as dangerous as putting a neon lamp instead if one constructed/soldered the lamp improperly.

Like a car can be burned with a 12V battery shorted same way as a house can be burned when the 220V line is shorted.

Safety is another thing and should be discussed in another thread.

And isolating the MCU on the X10 application on the powerline will not work for the MCU needs to read the signal burst at zero-crossing on the line itself.  Christmas lights have MCUs also directly connected to the powerline.

[insomartin]

oo nga naman! sabi ko nga eh! oops wrong thread.

[insomartin]

nasa health and medicine ba yung thread?