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High Voltage Ceramic Capacitors for Line Powered LEDs
By: Dave Johnson

Many AC line powered DC supplies for LEDs wired in long series strings use a series connected capacitor to limit the current drawn from the power line.  Typically, these capacitors are Mylar or polyester film devices.  However, I think that much smaller ceramic type capacitors might also work.  Below is a photo showing a pair of capacitors each with the same 0.47uF 250v rating.  Clearly the ceramic device is much smaller.

A typical LED series string design is shown below.  The smaller capacitor should make for a tighter package.  Iím going to build up some of these and try them out.  Iím especially interested in making some compact but bright night lights.

Please send comments to me

December  2010     Issue 14

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