Comparison of Eurorack DIY PSUs

A good clean power supply unit (PSU) is the most important part of a modular system. A proper linear power supply and good distribution makes a big difference to the stability and sound quality of the system. Switch-mode power supplies are smaller, lighter, and much more efficient than linear power supplies but produce more noise, (above audio range) on their output.

Safety
Use a RCD. Mains voltages can kill and capacitors in disconnected power supplies can still deliver quite a jolt. Unless you're qualified to work with mains electricity, ready made external transformers are safer.

Other useful power projects

 * Power Bus Board, Ken Stone's Modular Synthesizer
 * Power Supply Delay, Ken Stone's Modular Synthesizer
 * Engre, Engineering research and development