[hpsdr] Demeter PSU design

[Graham Haddock]

Jeroen:

For the record, and your power supply planning, total power consumption for
ALEX varies over a range of 90 to 180 mA., all from the +12 volt supply.
90 mA is with 12.0 volt supply, minimum number of relays active.
180 mA is with 13.8 Volt supply, 50 MHz transmit, 50 MHz preamp. on,
and both receive attenuators active, all LEDs on.

--- Graham / KE9H

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