I was doing research on AC to DC power supplies and I came across a lot of schematics that use regulators like the one below:
Initially I drew out what I thought an AC to DC schematic would be and I basically did everything except including the LM7812 regulator.
Is it necessary or could someone get an equally good power supply by just using an effective transformer, bridge rectifier, and capacitors?
From the (Wiki) page it says the regulator is, "... conceptually an op amp with a relatively high output current capacity." Why this might be important, I do not know.
It seems to be the de facto standard in the AC to DC converter world and I would really like to know the importance of it.