T1: 110/220 / 6+6 v, 250mA transform
D1,D2,D3: retificator general use diodes
IC1: 7805 tension regulator IC for 5.0 volt
Retificator diodes usualy give a fall from 0.6 to 0.7 volts.
D3 is used to make tension falls from 5 to about 4.5 volts.