Here is a basic voltage source circuit in 7805 but adjustable, need a continuous supply unregulated, a filter capacitor, an integrated 7805 + 1 operational amplifier 4558
Adjustable voltage source regulator parts list :
R1 : 10Kohm
C1 : 100nF
C2 : 330nF
C3 : 10uF
U1 : 7805
U2A : op amp 4558
