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Experiment No:06

Title: - To design, build and test half wave and full wave precision rectifier circuits for given specifications.

AIM : - To design, build and test half wave and full wave precision rectifier circuits for given specifications.

APPARATUS REQUIRED :-

Op-Amp IC 741, capacitors, resistor, Dual power supply, Regulated power supply, CRO, function generator, Multimeter, etc.

THEORY :-

The half-wave rectifier kept only those parts of the original input signal that were positive (or negative). Is there a way to keep both halves of the input signal, and yet render them both with the same output polarity? This is the behaviour of a full-wave rectifier. The circuit shown above performs full-wave rectification on the input signal, as shown. If you wish the final output to be positive instead of negative, simply reverse the two diodes in the half-wave rectifier section.

The full-wave rectifier depends on the fact that both the half-wave rectifier and the summing amplifier are precision circuits. It operates by producing an inverted half-wave-rectified signal and then adding that signal at double amplitude to the original signal in the summing amplifier. The result is a reversal of the selected polarity of the input signal.

The resistor values shown are reasonable; the resistors themselves must be of high precision in order to keep the rectification process accurate. If for some reason you must build such a circuit with a different set of resistance values, you must maintain the indicated 2:1 resistance ratio, and you must still use precision resistors in order to obtain accurate results.

Circuit Diagram:-

DESIGN :-

PROCEDURE : -

1. Connect the circuit as per the circuit diagram.

2. Give a sinusoidal input of VPP, 1 KHz from a signal generator.

3. Switch on the power supply and note down the output from CRO.

4. Without Connecting Rf2, the wave form of the half wave rectifier is produced.

5. At some value of Rf2 the wave form of a full wave rectifier is obtained.

6. Repeat the above procedure by reversing the diodes.

OBSERVATION TABLE : - Half Wave Rectifier

Sr. No

INPUT VOLTAGE

Without ref RF2

CRO OUTPUT

Full Wave Rectifier

Sr. No

INPUT VOLTAGE

With ref RF2

CRO OUTPUT

CONCLUSION :-

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