dc power supplies

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Raja asked How to check the ripple in dc power supply?

How to check whether the output of a DC power supply has ripple or not? By means of multimeter or any simple circuit?if yes , how to measure the ripple to what percentage or in volt with reference to rms voltage? Please explain me

And got the following answer:

If you have an oscilloscope, you can observe the ripple directly. Otherwise, the easiest thing to do might be to put a diode in series with the DC output, and charge a capacitor with that. The capacitor will charge to the average voltage of the DC supply plus half the peak ripple, minus the drop of the diode itself. You can algebraically solve for the peak to peak ripple. Assuming that the ripple is a sine wave, you can get RMS by dividing by the square root of 2.

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