This circuit is from an old documentation, making use of an operational of the time. The circuit can be adapted to use modern components. The power supply must be symmetrical.
This transformerless power supply uses an SCR as a regulator. It was found in a Popular...
May 2017 - Mouser Electronics announced the availability of the new P7 CoolMOS transistors from...
This is the power supply circuit for the amplifier in the previous circuit. The source is...