Advanced Raspberry Pi: Raspbian Linux and GPIO Integration

Appendix A: Power Standards

The following table references the standard ATX power supply voltages , regulation (tolerance), and voltage ranges. This has no direct bearing on the Raspberry Pi but does provide for comparison of power tolerances.

Supply Volts	Tolerance		Minimum	Maximum	Ripple (Peak)
+5 V	±5%	± 0.25 V	+4.75 V	+5.25 V	50 mV
-5 V	±10%	±0.50 V	–4.50 V	–5.50 V	50 mV
+12 V	±5%	±0.60 V	+11.40 V	+12.60 V	120 mV
-12 V	±10%	±1.2 V	–10.8 V	–13.2 V	120 mV
+3.3 V	±5%	±0.165 V	+3.135 V	+3.465 V	50 mV
+5 VSB	±5%	±0.25 V	+4.75 V	+5.25 V	50 mV

Appendix B: Electronics Reference

The experienced electronic hobbyist or engineer will already know these formulas and units. This reference material is provided as a convenience for the student or beginning hobbyist.

Ohm’s Law

Using the following ...