12 V x 1 A power supply (CB12207E)

The transistor of this power source can be the TIP31 or TIP41 which must be equipped with a heat radiator. The bridge diodes can be 1N4004 and the transformer has a secondary 12 V x 1 A. Capacitor C1 can be 2. 200uF or 4.700uF and the zener is 1 W.