Reply to "Surgery on Plastic Lenses for Observation Car Tail Lights"

gunrunnerjohnOGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER

The LED's on my little board are this size.

SmartLED SMD Side

Digikey has them: Osram LW L283-Q1R2-3K8L-1-Z, white.

The resistor in the board is an 0805 size resistor. They come in power ratings up to 1/2 a watt. I suspect that for this task, we'll light the LED's pretty dimly, so the standard 1/8 or 1/4 watt ones should do the trick.

The resistor value is totally dependent on the amount of light you want. The Drumhead shouldn't be another headlight, so the resistor value is going to be at least 1K I would expect. I'd probably pick up a few 470, 1K, 1.5K, and 2.2K values to start and see how it works out. Also, the resistor value is TOTALLY dependent on the input voltage. If you're going to try to run this on AC, swap the polarity of a pair of the LEDs, that will provide reverse voltage protection for the whole lot. For DC, they have to be as shown, the little stripe is the cathode.

Here's the Gerber files.

Drumhead 6 LED Board Gerber.zip

Here is the complex schematic of the board.

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5/25/228:44 PM

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Drumhead 6 LED Board Gerber.zip

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