Arc lamp experimenters, free ILC power supply board

[George Pontis]

I have two power supply boards from ILC Technology free for the asking
to any student, or for the cost of postage to others. I believe that
they are constant current DC power supplies that would put out
something like 10-20A at maybe 20-30V. This is just a guess based on
the components and 5 minutes of circuit tracing. For example, there is
a current sense resistor that is built from two .02 ohm resistors in
parallel, each having at least a two watt rating. The output is not
isolated from the AC line. There is a connector that interfaces to the
circuits through optoisolators.

The only thing close to a part number is "217847". There are four pots
labeled "Curr", "Mod Min", "Mod Max", and "Range". I believe that these
are unused and working assemblies.

There are no high voltage trigger circuits, so perhaps it works with an
external trigger or maybe it is for a MH lamp. One would need to make a
heat sink from an aluminum plate and attach the power switching
transistor and diode to it with some insulating washers. There is a
thermal cutout on wire leads to protect the circuit if the heat sink
gets too warm. For a picture of the board:

http://www.z9.com/ILC_PS.jpg

If anyone has the interest and enough electronics knowledge to
experiment with one safely, contact me through email and we'll figure
out how to get it in your hands. Actually I have two and am happy to
give both away.

George
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[George Pontis]

Thats a ILC 175 watt PSU. ~14 volts at up to 20A. is about right.

For a look a closely related schematic, see:
http://optoelectronics.perkinelmer.com/content/RelatedLinks/cermaxguid
e.pdf

have a look at page 27 of the above.

We dont have any 175 watt lamps or I'd take it off your hands in a
heartbeat, all our stuff is 300 W :-(

Steve Roberts, Research Associate, Dept of Polymer Science, The
University of Akron.

Right on Steve! The physical circuit doesn't have the drain and source
of the MOSFET shorted together as in the figure, and it has the extra
connector, but it does look very close. They are both accounted for at
this point.

In the same grab bag I also found what looks like a 300W or 700W
elliptical focus cermax lamp. Without the correct power supply or
heatsink mounting I am not going to be firing up this lamp, but it is a
beautiful piece of techno-sculpture.

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