Power lines sound
If using a power meter software or even meter, you will see the value of the electricity line negative (-) is quite low compared to the positive line (+). This is because we now no longer important. Although a 20-pin ATX power supply unit with leg and foot No. 12 is -12V -5V but No. 18 is almost never used. Some devices need to include negative voltages:
+ The ISA expansion cards.
+ Serial port or LAN
+ Floppy Disk older generation.
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