A load $($with internal resistance, R$($L$)=2*($EFG$+1000)$ Omega$)$ requires V$($L$)=($A$+$B$)$ V to operate properly when the

supply voltage, E$=[$AB$]$ V$.$

a$)$ Find the components used in empty box using one or combination of different practical diodes $($ Si or Ge or GaAs or Zener$),$ as shown in Figure $1.$

b$)$ Compare this network by consider other diodes $($except from part a$)$ inside the empty box with a proper diagram and

calculation so that it can drive this load at its required voltage.