14 May
2012
14 May
'12
1:02 p.m.
The 11/44 uses the H7140 power supply which was also
used in the 11/24
and VAX-11/730. It is quite different than the H765 power supply used
My 11/730 ha a totally differenet PSU to the H7140. I am not sure what it
is called, but it;s a ltitle thing that sits in the right hand half of
the CPU cabinet over the TU58. it might be electrically related to the
H7140, but it's not the same unit.
MAybe some 11/730s had the H7140, certianly not all did.
in the 11/34, 11/35, and 10.5-inch-tall 11/05 and
11/10.
Indeed. The H7140 is a very complex off-line SMPSU. In fact it's 3
chopper circuits in the same boxx, all running of the smae 350V rectified
mains rail
The H765 is a mains-freqeuncy transformer followed by swtiching
regulators (the DEC 'power bricks'). FWIW, so is the H742, the supply
used with the BA11-F 21" 11/35, 11/40, 11/45 systems.
-tony