I have a design which operates with 4 dc Voltage supply +6, +3, -3, -6.

Instead of 4 supply I want to use one +12V supply and divide it into 12, 9, 6,3 voltages.

I can not use op-amp. I can not use simple resistance divider due to power consumption limitation.

What do you suggest?

 

You also need to specify the currents required by the four circuits. Use Google to search for voltage regulators and dc to dc converters.

Timescope