The Secret Life of Electrolytic Capacitors

Capacitors are the most common point of failure in aging electronics due to electrolyte drying.

ESR and Frequency Response

• Low Equivalent Series Resistance is critical for high-frequency switching regulators.
• Measure ESR with a specialized meter to detect failure before the capacitor bursts.
• Replace old capacitors with low-ESR equivalents to improve stability.

Visual Inspection Techniques

• Bulging tops indicate gas buildup from electrolyte drying and impending explosion.
• Leaking fluid usually leaves a white crusty residue on the surrounding components.
• Check for bent or broken leads on through-hole capacitors.

Regular capacitor inspection can prevent catastrophic board failure.