Chapter 15

Calculate the percentage ripple for the voltage developed across a \(120-\mu \mathrm{F}\) filter capacitor when providing a load current of \(80 \mathrm{~mA}\). The full-wave rectifier operating from the \(60-\mathrm{Hz}\) supply develops a peak rectified voltage of \(25 \mathrm{~V}\).

An \(R C\) filter stage \((R=33 \Omega, C=120 \mu \mathrm{F})\) is used to filter a signal of \(24 \mathrm{~V} \mathrm{dc}\) with \(2 \mathrm{~V} \mathrm{rms}\) POWER operating from a full-wave rectifier. Calculate the percentage ripple at the output of the \(R C\) section for a 100 -mA load. Also calculate the ripple of the filtered signal applied to the \(R C\) stage.

A simple capacitor filter has an input of \(40 \mathrm{~V}\) dc. If this voltage is fed through an \(R C\) filter section \((R=50 \Omega, C=40 \mu \mathrm{F})\), what is the load current for a load resistance of \(500 \Omega\) ?

Calculate the rms ripple voltage at the output of an \(R C\) filter section that feeds a \(1-\mathrm{k} \Omega\) load when the filter input is \(50 \mathrm{~V}\) dc with \(2.5\) - \(\mathrm{V}\) rms ripple from a full-wave rectifier and capacitor filter. The \(R C\) filter section components are \(R=100 \Omega\) and \(C=100 \mu \mathrm{F}\).

Draw the circuit of a voltage supply comprised of a full-wave bridge rectifier, capacitor filter, and IC regulator to provide an output of \(+12 \mathrm{~V}\).