A diode bridge modulator is one kind of balanced modulator.
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Merits a diode bridge rectifier is simple to build
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Bridge diodes are generally used in a bridge rectifier to
convert AC into DC.
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How to test a diode bridge ? Diode bridge is a device is used to
convert an AC signals (say AC voltage) to DC output (say DC
voltage). So, to test it, you can apply a AC voltage v = Vm Sin
(wt) at its 2 inputs and measure DC output voltage Vdc.