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Chapter 30

Q. 30.8

When the circuit of Fig. 30-21 is working normally, it has an rms secondary voltage of 12.7 V, a load voltage of 18 V, and a peak-topeak ripple of 318 mV. If the filter capacitor is open, what happens to the dc load voltage?

Step-by-Step

Verified Solution

With an open filter capacitor, the circuit reverts to a bridge rectifier with no filter capacitor. Because there is no filtering, an oscilloscope across the load will display a full-wave signal with a peak value of 18 V. The average value is 63.6% of 18 V, which is 11.4 V.