It is a modern circuit, Thus you can buy all components in the local store or buy KIT. And the important thing is the overcurrent protection.
This is how to modify old Lead-acid battery charger or convert power supply to battery charger in automatic. To protect over charging by CA723 and power SCR
For digital that need high current 5A up it low noise and easy to build because is linear
This is the 0-30V,0-2A adjustable voltage and current regulator that developed from the cheap adjustable 0-30V 2A Laboratory DC Power Supply project using LM723 is used widely, for a long time.
This is 12V 10A power supply circuit can use it instead of normal 12V car battery. But save and easy to use when you are in your house.