Editing Rectifier (section)

=== Choke input filter ===
It is also possible to put the rectified waveform into a choke-input filter.  The advantage of this circuit is that the current waveform is smoother: current is drawn over the entire cycle, instead of being drawn in pulses at the peaks of AC voltage each half-cycle as in a capacitor input filter.  The disadvantage is that the voltage output is much lower – the average of an AC half-cycle rather than the peak; this is about 90% of the RMS voltage versus <math>\sqrt 2</math> times the RMS voltage (unloaded) for a capacitor input filter.  Offsetting this is superior voltage regulation and higher available current, which reduce peak voltage and ripple current demands on power supply components.  Inductors require [[Magnetic core|cores]] of iron or other magnetic materials, and add weight and size.  Their use in power supplies for electronic equipment has therefore dwindled in favour of semiconductor circuits such as voltage regulators.<ref>H. P. Westman et al., (ed), ''Reference Data for Radio Engineers Fifth Edition'', 1968, Howard W. Sams pp. 12-14, 12-15, 12-16</ref>