28 Jun
2006
28 Jun
'06
6:11 p.m.
Wolfe, Julian wrote:
Hi all,
I got a UNIBUS ESDI controller and I'm currently shopping for a disk drive
for it. What I was thinking of doing is mounting a bracket inside the
BA11-K and powering the disk drive from the BA11-K power supply, just
using
a molex connector to one of the unused harness connectors on the power
distribution board that supplies the correct voltages.
Would doing this pose any sort of problem? i.e. violating amperage limits
etc? It would probably be something like a Maxtor XT-4170.
The biggest problem is the BA11K box does not produce +12V, but rather +15V,
and it is limited to +4A max (the Maxtor is rated for 1.5A typ but 4.5A max
at +12v, and up to 3A for the first 15sec or so at startup).
So you'd have to regulate +15V to +12V at something like 5A(max)/2A(typ)
which
is straightforward, but I think you'd be hosing your BA11K +15V supply
either
quickly (fuse blow) or slowly (overtemp death).
I'd recommend an external 5V/12V supply for the disk drive.