How to Build a Dual Output DC Power Supply ±30V from 220V AC Input?

The discussion focuses on designing a dual output DC power supply providing ±30V from a 220V AC input, primarily for powering an amplifier circuit. Key considerations include determining maximum current requirements, voltage regulation, and transformer sizing based on power needs. A basic linear power supply design is recommended for student projects, involving selecting an appropriate transformer with the correct turns ratio to achieve the desired output voltage. Filtering capacitors should be calculated to minimize ripple under maximum load conditions. For voltage regulation, adjustable linear regulators such as the LM317 (positive) and LM337 (negative) are suggested, as standard 7800 series regulators do not support 30V outputs. Reference is made to an amplifier circuit using 2N3055 and MJ2955 transistors, with a source link provided for further details.
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