A simple diode rectifier has ‘ripples’ in the output wave which makes it unsuitable as a DC source. To overcome this one can use

To overcome the issue of 'ripples' in the output wave of a simple diode rectifier, one can use a filter capacitor. The filter capacitor is used after the rectifier circuit to smooth out the waveform and reduce the ripple voltage. This results in a more stable DC output, making it more suitable as a DC source.

Here are the steps:

1. Connect the output of the diode rectifier to the input of a filter capacitor. The positive terminal of the capacitor should be connected to the positive output of the rectifier, and the negative terminal to the negative output.

2. The filter capacitor works by charging up when the output voltage of the rectifier is high, and discharging when the output voltage is low. This has the effect of 'filling in' the dips in the rectified waveform, reducing the ripple.

3. The value of the capacitor needs to be chosen carefully. A larger capacitor will provide more smoothing, but will also take longer to charge and discharge, which can cause problems at high frequencies.

4. The output of the filter capacitor is a smoother DC voltage, suitable for use as a DC source.

Remember that while this method reduces ripple, it does not eliminate it completely. For applications that require a very stable DC voltage, further regulation may be necessary.