Electronic – Using 12V DC to create symmetric power source

power supplyvoltage-regulator

I want to power a symmetric amp op with a raw and cheap 12V wall power source.

Can I use a schema like this to create a symmetric output ?
Or it will fail ?


simulate this circuit – Schematic created using CircuitLab

ps: I know I can use non symmetric amp ops, but I want to use symetric ones.

Best Answer

You would do much better by using an opamp to make the ground point.

I sugget using a circuit like this:

enter image description here

Just use your 12 V instead of the 9V battery. It depends on the opamp how much current can flow through the ground connection.

This circuit is also much more efficient than your proposal.

To make it suitable for higher (ground) currents, use a power-opamp (some audio power amps are also suitable) or see WhatRoughBeats's answer for a discrete solution. Note that that solution has no over current / over temperature protection.