Picture 1
Full-wave rectifier with C filter can be created by adding a capacitor in the circuit of figure 2. Can also use a transformer without CT, but by assembling 4-diode as shown following 1.
Picture 2
For example, you designed the full-wave rectifier circuit from the supply grid to supply 220V/50Hz load of 0.5 A. What is the required capacitor value so that this circuit has a voltage ripple of no more than 0.75 Vpp. If formula (7) be inverted so obtained.
C = I.T / Vr = (0.5) (0.01) / 0.75 = 6600 UF.
Picture 3
For this size capacitor elco widely available type which has a maximum working voltage polarity and specific. Working voltage capacitors used must be greater than the power supply output voltage. Barangkalai you now understand why the series of audio you create buzz, try to check the power supply rectifier circuit that you created, if the voltage ripple is quite disturbing. If not available in the market of such a large capacitor, can certainly memparalel two or three capacitors.
Picture 4