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A full-wave center-tapped rectifier circuit is shown in Fig. . Assume that for each

diode, the cut-in voltage, V = 0.6V and the diode forward resistance, rf is 15 .

The load resistor, R = 95 . Determine:

• peak output voltage, Vo across the load, R

• Sketch the output voltage, Vo and label its peak value.

25: 1

125 V (peak voltage)

( sine wave )

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3.8V

Vo

t

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Example . What value of series resistor is required to limit the current through a LED to 20 mA

with a forward voltage drop of 1.6 V when connected to a 10V supply ?

Example . What is current through the LED in the circuit shown in Fig. 7.5 ? Assume that voltage

drop across the LED is 2 V.

Solution.

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