ɐ sˈɪmpəl vˈoʊltɪdʒ dɹˈɑːpɚ kæn biː jˈuːzd tə ɹᵻdˈuːs ðə vˈoʊltɪdʒ fɔːɹ lˈoʊpˈaʊɚ dɪvˈaɪsᵻz; ɪf mˈoːɹ ðɐn twˈɛlv vˈiː ɪz ɹᵻkwˈaɪɚd, ɔːɹ fɔːɹ hˈaɪpˈaʊɚd dɪvˈaɪsᵻz, ɐ swˈɪtʃtmˈoʊd pˈaʊɚ səplˈaɪ ɪz jˈuːzd.
A simple voltage dropper can be used to reduce the voltage for low-power devices; if more than 12V is required, or for high-powered devices, a switched-mode power supply is used.