RT802 DAC board

I found an analog devices RT802 quad 12 bit DAC board in a trash pile
along with some EG&G Torque Systems analog servo amps. Figured out
the wiring for one of the servo amps and had it running my 1hp PMDC
motor with an improvised tach (can only put ~350 watts into the motor
though... but it's a start).

Anyway, I ohmed out the board, set the bus address and got talking to
it. As of 2am last night I can control it via EMC's usrmot dac
command using a hacked up version of the STG driver.

The problem - there is a black encapsulated power module on the end of
the board which says "Analog Devices 949" that gets very, very hot -
the paint is blistered. It appears to be a +5v to +/- something
converter. When hot the outputs are about +/- 8v and unstable - which
of course means the dac outputs are unpredictable. I am guessing it
should be a +/- 12v supply. There is a seperate (-) 10v reference
device, although it presumably gets its power from this module.

Assuming I can't find a bad chip on the board hogging too much
current, what are my options? Should I run the board off the +/-12v
on the bus? Use an external supply? Replace the dc-dc module with a
new one from another source (www.analog.com has no mention of this
device)? If there is a reference chip, then the supply voltages don't
need to be that precise or clean, right?

Anyone have a manual for the RT802? The dos software and it's manual
were found with the board, but no data on the board itself.

Thanks for any ideas...

Chris

--
Christopher C. Stratton, stratton@...
Instrument Maker, Horn Player & Engineer
22 Adrian Street, Somerville, MA 02143
http://www.mdc.net/~stratton
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