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Anonymous Poster

LED

08/14/2009 12:22 PM

why LED indication lamp needs capacitor in series with the resistor
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Graebeard
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Engineering Fields - Electrical Engineering - New Member

Join Date: Aug 2007
Location: Toronto
Posts: 239
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#1

Re: LED

08/14/2009 2:13 PM

normally it does not. My guess is that whoever designed this configuration wanted to turn it off using the RC timing.
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mjb1962853
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Engineering Fields - Electrical Engineering - Analog and Digital Circuit Design Engineering Fields - Electromechanical Engineering - Transformers, Motors & Drives, EM Launchers Engineering Fields - Engineering Physics - Applied Electrical, Optical, and Mechanical

Join Date: Jan 2008
Location: NY
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#2

Re: LED

08/15/2009 12:27 PM

For AC operation only, a capacitor in series with a resistor provides a reactive impedance that limits LED current without dissipating energy as heat.
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