Do you know the 10A 1-30V Variable Power Supply with LM317?

About the Variable Power Supply with LM317,do you know?

Here is a simple and economical 10A variable power supply with 1.2-30V. LM317 have been used to drive 3 NPN TIP41C transistors (or three 2N3055). Nothing to say about the project, it is really simple. The main supply must be connected to a rectified source (transformer + 20-30A bridge rectifier). For Q1,2 and 3 can be used any power TO220 transistor (TIP132C,TIP41C etc) or three external 2N3055 transistors.

There are many ic components such as lm358,ne555,lm339 beside LM317,those are top electronic components,the electronic company develops very quickly now,so the need of hot
ic components model is become more.