For analog synths, a very stable power supply is of the utmost importance, because pitches are dependent of voltages. For a 1v increase, the VCOs frequency double. So a small instability in the voltage of the power source may result in an uncontrollable pitch variation, making the instrument unplayable.

Having in mind the chips I am going to use, the different modules will need different voltages simultaneously :

• +15v/-15v for the VCOs and VCFs, and all op amps
• +5v for the control voltage modules, especially those built around Arduinos

I don't want to mess with main voltages, so I'll start with a wall wart adapter providing 15v AC, rectify and filter it and use LM7xxx regulators. This design is inspired by Ray Wilson's one, from Music From Outer Space.

There are two small issues with that design:

1. I had troubles finding a euro plug 15v AC wall wart adapter. The only one I've found provides only 650 mA. I hope that will be sufficient
2. As of today, I am unsure where is the best place to put the 5v regulator : just after the big filtering caps of the rectifier section and thus at the same level of the other regulators, or after the 15v regulator, placing both in series. I'll try and see which one is better.