A Eurorack system's total module current draw must stay within its power supply's capacity

Before adding any module you must plan power: sum the current requirement of all existing modules plus the new one and confirm it stays under the supply’s limit. The A-100’s standard supply outputs +12V/-12V at up to 650 mA; the manual’s install check warns to keep the total below 1200 mA and, if it exceeds that, to fit a second power supply first. Ignoring this can damage the system and voids the guarantee. Because Eurorack modules publish their current draw (the module-overview table lists mA per module), building a rack is partly an accounting exercise, not just a musical one.

Examples

The manual: ‘Calculate the total current requirement of existing modules plus the new module/s’ and ‘Check that this total is less than 1200mA.’ A module overview entry like ‘A-110 … 70’ means the A-110 VCO draws ~70 mA — add up such figures before buying a case/PSU.

Assessment

Given a supply rated 650 mA and a list of modules with their mA draws, decide whether the system fits or needs a second supply, and justify the arithmetic.