A
Arno
True. Which is why fools buy computers assembled by the
electrically naive. Which is why fools buy supplies only on dollars
and watts. Why so many buy 500 watt supplies that are electrically
equivalent to a 350 watt supply in a brand name computer.
The informed computer assembler knows what many required power
supply functions are so that computers are never damaged by the
supply. And so that the load never damages a supply. Some examples of
what so many Certified A+ computer techs never learn:
Acoustics noise 25.8dBA typical at 70w, 30cm
Short circuit protection on all outputs
Over voltage protection
Over power protection
100% hi-pot test
100% burn in, high temperature cycled on/off
PFC harmonics compliance: EN61000-3-2 + A1 + A2
EMI/RFI compliance: CE, CISPR22 & FCC part 15 class B
Safety compliance: VDE, TUV, D, N, S, Fi, UL, C-UL & CB
Hold up time, full load: 16ms. typical
Dielectric withstand, input to frame/ground: 1800VAC, 1sec.
Dielectric withstand, input to output: 1800VAC, 1sec.
Ripple/noise: 1%
MTBF, full load @ 25?C amb.: >100k hrs
Power supplies that would cause disk drive failure are typically
missing these and many other functions. Power supplies even 40 years
ago were not damaged by the load. All power supplies from the
monster sized to single chip supplies were not damaged by the load
even 40 years ago. It was industry standard even that long ago.
Supply failure is traceable to a computer assembler without
electrical knowledge. Who buys a supply only on dollars and watts. A
problem becoming severe in North America. Basic electrical knowledge
has become so minimal that 60% of new Silicon Valley employees come
from India or China. Finding enough Americans with basic electrical
knowledge has become that difficult.
The load must never damage a supply. And a supply must never damage
its load (ie disk drive). Overloading must never damage a supply.
But does when the supply is missing essential functions - when sold on
price, When the consumer does always demand technical specs.
Your point? Damanding the world be different is very ineffective
as a problem solvong strategy....
Arno