... a PSU that is not producing enough power will be depriving the major hardware of the said power which will weaken them and bring about a premature end of their life expectancy, this if the PSU does not pop first and take out the whole computer.
Good. So you list each internal component damaged or threatened by low voltage. And provide numbers from manufacturer datasheets that defines risk and resulting damage. Layman can quickly identify bogus claims: no hard facts and no numbers.
First, some specification numbers. Earliest digital electronics were the 4000 series. View its datasheet
Voltage that cause no damage are anywhere from +20 volts to -0.5 volts. How can this be when low voltage causes damage? Voltage can even go slightly negative with no damage. Contradicting urban myths about destructive low voltages.
Second, later digital electronics were the 74xx00 series. Another datasheet
. Voltages without damage are anywhere from -0.5 to 7 volts. How can this be when urban myths said low voltage causes damage. Destructive low voltages exist when using wild speculation; by ignoring basic electronic concepts and numbers.
Third. Shorting all PSU outputs causes maximum power draw. Drawing excessive power definitely damages a PSU - the subjective claim. ATX power supply standard requires testing all PSUs by shorting all outputs together? The spec even defines how thick that shorting wire must be to maximize output power. The spec then says that short circuit must not cause any PSU damage. Clearly the spec must be lying because we were told drawing too much power causes hardware damage. We were told that by one who never cites datasheets or numbers. Who never says which parts are at risk.
Claims made without hard facts and numbers are routinely suspect. Some with least technical knowledge post no numbers; cite no manufacturer specs; never read datasheets. Somehow hearsay becomes knowledge that even contradicts industry standards.
Four. Designers test hardware using excessively low AC voltage. Because a PSU must output rock stable and unchanging voltages even when AC mains voltage drops so low that ... incandescent bulbs dim to 50%.
Tom MacIntyre describes what we designers do to confirm everything works normal and happy at low voltages. He also provides numbers:
We operate everything on an isolated variac, which means that I can control the voltage going into the unit I am working on from about 150 volts down to zero. This enables us to verify power regulation for over and under-voltage situations.
... due to the current and duty cycle of the switching, they [switching power supplies] can and will regulate with very low voltages on the AC line in; the best I've seen was a TV which didn't die until I turned the variac down to 37 VAC! A brownout wouldn't have even affected the picture on that set.
Not die as in damage. Die as in routine powered off when AC voltage is too low. Too low for that 120 volt appliance was 37 volts. And no damage. Because low voltage must not and does not damage properly designed electronics ... as demonstrated by datasheets and numbers ... and Tom MacIntyre.
Low voltage is a threat to motorized appliances. And does not harm electronics.
Edited by westom, 26 September 2013 - 10:02 PM.