The power supply should be capable of supplying the maximum current required with good stabilization. I used commercially available 40 - 0 - 40 5A transformer. The transformer have 6V, 9V, 12V and 22V windings also. The transformer cost me around Rs: 370. Power supply provides 110 Volt 2.5 Amps or 55 Volt 5 Amps. Three-pin regulator IC is used for regulating 12-volt supply. Good heat sink should be provided for regulator IC.

Circuit diagram Power Supply with good stabilization

The power supply should be capable of supplying the maximum current required with good stabilization. I used commercially available 40 – 0 – 40 5A transformer. The transformer have 6V, 9V, 12V and 22V windings also. The transformer cost me around Rs: 370. Power supply provides 110 Volt 2.5 Amps or 55 Volt 5 Amps. Three-pin regulator IC is used for regulating 12-volt supply. Good heat sink should be provided for regulator IC.