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Working with diodes and operational amplifiers

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D1, D2, D3, D4 together forms a bridge rectifier circuit, which will make the AC voltage output of the transformer to DC (actually, a pulsating DC). They must be identical PN junction diodes.
If we label the transformer connected points as A and B, (upper A, lower B) and assume an AC waveform, the following process will occur.

Suppose, the positive peak of the AC Voltage appears at A, the diode D1 will be forward biased (D2 reverse biased) and will conduct the positive part to point D. At the same time, the lower part is at -ve peak, so the diode D3 will conduct (D4 reverse biased) to C. So we will get a rectified output (with C negative ...

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