On Sun, 4 Apr 2010 18:58:54 +0000, RICHARD SOLOMON wrote:
>I would replace them with a LED device (need a series resistor).
>I have the 2800 Rotor, probably the same Control Box. Lets see
>how long the bulbs last here in the land of high AC lines !!
That's what I just did. It's cold and rainy in the Santa Cruz
Mountains today, so it's a good day for a project like this.
Studying the schematic showed that the existing bulb is driven from
regulated 12VDC. On my workbench, I tried 5 LEDs in series on my
regulated and current limited HP supply. That wasn't enough to
overcome their barrier voltage, so I dropped down to 4 bulbs. That's
quite nice, draws less than 5 mA from 12V, and puts out a lot of
I opened up the controller and rigged the 4-LED series string
alongside of the right side of the bezel and connected them to the
that 12V line. They provide a very acceptable level of illumination.
Thanks for all the info and suggestions.
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