Please, read this carefully.
By using the index page and device articles, schematics and whatnot, you realize and confirm that you and ONLY you are responsible for whatever impact they may have on you or your belongings: sorry, but i may not be held responsible for your module built completely by you after my design that blew up in your hands. Please, be careful while working: remember to NEVER solder and fix stuff while it's powered by ANY power supply, double check your etched boards and be generally cautios and careful.
if you are thinking to make a synthesizer PSU and do not have an idea how a transformer works and how to connect it to the outlet - DO NOT DO IT. Buy a PSU. Your life is more expensive than that.
if you have little idea how to solder and where to get parts, but are planning on making a modular wall - DO NOT DO IT, start with simple small NE555/CD40106 buzzers, you will be less disappointed and you will gain more experience.
TL:DR BE CAREFUL AND ESTIMATE YOURSELF SOBERLY, AND DO NOT BLAME ME IF YOUR UNIT DOESN'T WORK. Take care!