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240 volts 100 hertz 29 led lamp 2010-07-05

RODALCO

Well-Known Member
RODALCO submitted a new article:

240 Volts 100 Hertz 29 LED lamp - This is the improved version of the LED lamp posted about 1 year ago which ran on half wave rectifi

This is the improved version of the LED lamp posted about 1 year ago which ran on half wave rectified dc directly from the 240 Volts mains.

As I test my projects thoroughly and want to ensure a good reliability of the project a long time 2000 hours duration run is done prior to posting the details on the web.
Again, I have choosen for the resistive option because it is more reliable than a capacitor voltage dropper.

Parts required:

29 x White LED's
6 x 2k2 1Watt resistors
4 x 1N4007...
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Sceadwian

Banned
Without filtering of the rectified supply this project will produce a light that flickers so badly that it wouldn't be practical to use for general purpose lighting, it would produce harmonic flicker effects with a television scan frequencies as well.
 

ronsimpson

Well-Known Member
Most Helpful Member
The light will flicker at 2x the line frequency (50hz x2 =100) in your case, 60hz x 2 =120 in my case. The old style Fluorescent lamp have 100/120hz flicker (pulses of light).
 

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