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12V to -5V/0/5V

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jamboard

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Hi all,

I'm working on a MIDI synth project and have questions regarding its power supply. I want to power it from one of those 12V DC/350mA bricks I have around. I need to generate roughly +5V, 150 mA (for a microcontroller, a backlit LCD display and a bunch of LEDs / logic circuits, and the audio circuitry), 50 mA for the -5V rail (audio circuitry only). What I use so far is a resistor divider and an ersatz of high-current op-amp using an op-amp for the feedback + a push-pull: https://img19.imageshack.us/img19/8468/picture3ge.png . I am bit worried that this might not be the best option, because one of the transistors tends to generate a lot of heat. And this takes a lot of PCB real estate.

I have found many virtual grounds circuits online, but most of them seem to be for headphone amps where the load on the -/+ rails is equal -- so I am not sure if they would perform well with an uneven load. I'm tempted to try the TLE2426 + BUF634 + anonymous op-amp for the feedback loop, but this is a more expensive solution...

Any other approach to this problem?
 
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