1. The problem statement, all variables and given/known data https://physicsforums-bernhardtmediall.netdna-ssl.com/data/attachments/66/66455-bb02bb0d3c839e914352eb0379b453f2.jpg [Broken] 2. Relevant equations 3. The attempt at a solution Transistors TR2 and TR1 amplify the current being regulated through the regulator. The current gain of transistors is not important since the regulator will increase/decrease the current through pass transistors to maintain output voltage. Anyone can help if I am on the right track?