Went today to the shop to get many 150k and 75k resistors to finish the AVRSynth32 but they didn't have enough. My eye caught this fine toroidal transformer of 50VA (I know it is overkill!!!) that outputs +15V, -15V and common ground. So I decided that since I am going to build some yusynth modules, I should have a PSU at hand when the time comes.
The design followed is like the ones of ken stone and ray wilson (PSUs are not THAT complex) so for more info you can go here and here. Cautions apply as you will be working with lethal currents if you decide to build such thing. A note to perfboard makers like myself. The pinout of 79xx is DIFFERENT of the 78XX. For some, this may seem obvious, but for others, if they dont pay attention to the pinouts, they have surprises coming! The regulator might get extra hot and/or explode. Had done this some time ago with a 5v regulator (7905) and when I "checked" it if it was hot (using my finger) I left my fingerprints on the regulator (along with some skin layers that got roasted).
Making it on a perfboard is very simple but BEFORE you plug it, use your multimeter to search for any shorts that might damage the circuit and use a fuse on the mains part of the transformer.
As all sites that have such projects mention:
A note to readers:
All electronic projects and designs presented on this web site, or associated web sites should be considered dangerous if not lethal if not used safely. When working on projects based on these designs, use extreme care to ensure that you do not come into contact with mains AC voltages or high voltage DC. If you are not confident about working with mains voltages, or high voltages, or you are not legally allowed to work with mains voltages, or high voltages, you are advised not to attempt work on them. The author, host, and all people associated with these web pages disclaim any liability for damages should anyone be killed or injured while working on these projects, or projects based on these designs, or any other project or design presented on these web pages and any associated web pages. The author, host, and all people associated with these web pages also disclaim any liability for projects, or projects based on these designs, or any other project or design presented on these web pages and any associated web pages when used in such a way as to infringe relevant government regulations and by-laws.
(this also taken from ken stone's modular synth pages)