Editing Atari Portfolio Capacitor Replacement Guide (section)

=== Replacement Component Specifications ===

When sourcing replacement capacitors:

* '''Match or exceed the original voltage rating''' — never use a lower voltage rating
* '''Match the capacitance value''' — higher capacitance is generally acceptable for filter caps but stay within ±20%
* '''Use low-ESR electrolytic capacitors''' where possible — modern low-ESR aluminium or solid polymer capacitors will outperform the originals
* '''For the supercapacitor (C7):''' Use a '''0.47F 5.5V''' supercapacitor. This is available from major electronics distributors (e.g., Panasonic, KEMET). Ensure the physical size fits the board footprint
* SMD capacitors should match the original footprint size — most are 1206 or slightly larger packages