The 5V supply has a current limiting resistor (R1) to deal with that problem on its leg. Interestingly, this circuit seems to require the 3.3V output to act as a current sink.

Another pin you can use on the Nano to power it up is the 5V pin (located on Pin 27, close to the VIN pin at the end of the board). This pin mostly serves as a power output pin that supplies power ...

Auxiliary power of 3.3V is replacing the 5V auxiliary power that “silver boxes” supply in most computer systems, but some circuits still require a 5V supply. Such systems impose the messy task of ...

In modern processes making a 5V tolerant IO is not so simple, and might even not be possible. ... Absolute Maximum Ratings define IOVDD (I.O supply voltage) as -0.53V to 3.63V ...

Now the input supply is extended to the rest of the circuit through the PMOS. However, when VCC exceeds 5V, IN2 goes above the level of IN1. This causes the comparator output to be driven to the ...

It seems to me that the -5V and -12V lines are pretty much obsolete and just thrown in for compatibility reasons. As a matter of fact the SFX power supply standard drops the -5V entirely but keeps ...