alphatu_24
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« on: August 03, 2008, 07:57:25 PM » |
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anu po spec ng resistor na gingam8 to light up a led nakakonekta sa 220volts???
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The Philippine Electronics and Technology Forum
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« on: August 03, 2008, 07:57:25 PM » |
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rdpzycho
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« Reply #1 on: August 03, 2008, 08:12:14 PM » |
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mas maganda kung may series na capacitor para mababa ang losses. kung magpapa-ilaw ng 20mA LED sa 220V ng resistor lang, masyadong mataas ang power na kailangan.
mas maganda rin kung gagawing series resistor ang computed, madalas kasi hindi given ang rated voltage ng mga resistor kaya safer kung series (half nung computed x 2).
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zer0w1ng
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« Reply #2 on: August 04, 2008, 08:11:26 AM » |
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See here http://hobbycircuits.blogspot.com/There is a circuit for LED driven by 220VAC using capacitor as the limiter. Additional resistors was added for limiting the in-rush current and discharge of the caps when off. |
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jerimaya
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« Reply #3 on: August 14, 2008, 11:32:28 PM » |
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brod. maglagay kalang ng 100k na resistor sa LED okey na...tested kona
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zer0w1ng
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« Reply #4 on: August 15, 2008, 07:43:51 AM » |
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100K-1/2W resistor in series is good.
Plus an additional reverse diode across the LED is needed to protect it from a high reverse voltage on the negative AC swing.
LEDs have low reverse breakdown voltage near 5V and will be damaged if exposed for a long time.
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macky
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« Reply #5 on: August 15, 2008, 12:22:44 PM » |
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100K-1/2W resistor in series is good.
Plus an additional reverse diode across the LED is needed to protect it from a high reverse voltage on the negative AC swing.
LEDs have low reverse breakdown voltage near 5V and will be damaged if exposed for a long time.
pwede na ba ang IN4004? |
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zer0w1ng
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« Reply #6 on: August 15, 2008, 12:41:43 PM » |
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Yes you could use that.
Even a low voltage 1N4148 glass diode could be used.
The reverse voltage of the diode will be small because of the LED (approx 3V).
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macky
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« Reply #7 on: August 16, 2008, 12:36:39 PM » |
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thank sir zer0w1ng!
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john 3:16 | oil of gladness
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insomartin
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« Reply #8 on: April 24, 2009, 08:37:54 PM » |
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and this is the WORST WAY para mag light nang LED. gamit kna lang nang cellphone charger. 50 pesos lang or kung may naitatago kang hindi na ginagamit da best yun kasi regulated pa. ok... fine gagana nga. but for christ sake ang sarap humawak nang electronics kung hindi high voltage at isolated.
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insomartin
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« Reply #9 on: April 24, 2009, 08:42:31 PM » |
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100K-1/2W resistor in series is good.
Plus an additional reverse diode across the LED is needed to protect it from a high reverse voltage on the negative AC swing.
LEDs have low reverse breakdown voltage near 5V and will be damaged if exposed for a long time.
99999999977 but hindi pa din isolated sa 220v line. kahit nag voltage drop... correct me if i am wrong. |
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ultrasonic™
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never be harsh coz everythng is fine
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« Reply #10 on: April 24, 2009, 11:03:05 PM » |
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sa akin ini-estimate ko nlng hehehe from 110kohm up 270kohm  |
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im always walking on the rain so that no one could see me crying
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bennyrds
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« Reply #11 on: April 25, 2009, 03:10:34 AM » |
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10 k
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Kasamiko
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« Reply #12 on: April 25, 2009, 10:49:13 AM » |
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Ito ang ginagamit ko...pinalitan ko yung mga CFL na sira ng white LED..yung lamp socket na lang natitira..  |
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robbietan
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« Reply #13 on: April 25, 2009, 02:40:51 PM » |
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See here http://hobbycircuits.blogspot.com/There is a circuit for LED driven by 220VAC using capacitor as the limiter. Additional resistors was added for limiting the in-rush current and discharge of the caps when off. would it be better to add inductors instead of resistors to limit inrush current? |
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insomartin
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« Reply #14 on: April 25, 2009, 03:35:41 PM » |
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bakit nyo gusto i run yung LED sa 220?
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Kasamiko
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« Reply #15 on: April 25, 2009, 03:42:35 PM » |
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baka gusto nya replaced yung mga incandescent bulb with white LED's na...
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Visit My "BLAG!"If electricity comes from electrons, does morality come from morons?
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Woots29
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« Reply #16 on: April 25, 2009, 04:25:44 PM » |
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mahal ng white leds
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Kasamiko
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« Reply #17 on: April 25, 2009, 05:00:28 PM » |
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Wehehehehe....dati...now mura na lng
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Woots29
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« Reply #18 on: April 25, 2009, 05:12:13 PM » |
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magkano sir?
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Kasamiko
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« Reply #19 on: April 25, 2009, 05:14:55 PM » |
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Wala na yata 10 petot yan? may nabbebenta nyan dito before yung tinanggal sa mga mumurahin na lighter na may ilaw..
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The Philippine Electronics and Technology Forum
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May 15, 2008, 06:01:44 PM
