hi joe, the DC-DC converters are standard on the roach boards, so you only need to supply 3.3, 5 and 12 volts to the ATX connector.
if you use john ford's $30 pico-PSU-90, then you only have to supply one voltage: +12 Volts at 8 amps. i'm not sure about the maximum currents for each of the roaches three input voltages. i'm cc'ing the casper lists - someone will know. i can measure these currents with our clamp on amp-meter, but these will change a bit, depending on how heavily you load the FGPA and what ADC's are plugged into the roach board. best wishes, dan On Thu, Jan 19, 2012 at 10:53 AM, Joseph Greenberg <jgree...@nrao.edu>wrote: > ** > Hi Dan, > Thanks for the reply. > > Dan Werthimer wrote: > > > hi joe, > > can you leave the DC-DC converters on the roach board? > > Yes. Are they standard on all Roach I boards or do we have to specify > them? > > then you only need to supply the 12, 5 and 3.3 volts that > come from the ATX power supply. > > What is the maximum current we would need to supply for each of these > Voltages? > > Thanks, > Joe > > > > best wishes, > > dan > > > On Thu, Jan 19, 2012 at 10:28 AM, Joseph Greenberg <jgree...@nrao.edu>wrote: > >> We at NRAO are going to mount the Roach I board on a custom board, rather >> than using the usual chassis. >> We will have DC-DC converters on the board. >> The Roach documentation states: >> Voltages of 12V, 5V, 3.3V, 2.5V, 1.8V, 1.5V, 1V and 1.2V aux rails. >> >> Is there any specification of what maximum currents we need to supply for >> each voltage? >> >> Thanks, >> Joe >> >> > >
