
MAINS INPUT ARRANGEMENTS 55
A typical general purpose low-voltage d.c. power supply could be
expected to perform according to the following specifications:
Output voltage: Variable from 2 V to 24 V.
Output current: 2 A maximum.
Output impedance: Less than 0.1 Ω.
Line regulation: Better than 0.2%.
Load regulation: Better than 0.5%.
Ripple: Less than lOmV peak-peak at full-load.
Before describing some typical power supply circuitry, it is worth making
a few points concerning safety. Not only is the power supply one of the
few areas in which a potentially lethal shock hazard exists, but it is also
a region in which strict attention must be place ...