Double rail power supply

[AliEmad2002]

Simulated this circuit on: https://www.tinkercad.com/things/1n9Ooj7myNv?sharecode=l3nZVhHZ6ooL2q7mT4F9-DmU133C6-b4p9RSmQzyuYU

at V_in = 12V, observation is:

• Regulation and maximum rail output current depend on limitations of the main supply, Q1 and Q2.
• Non-equal loads on both rails are not a problem (like many circuits).