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4.7uF 25V Electrolytic Capacitor – -(pack of 10) 12V Police Siren Get the best price on4. 7uF 25V Electrolytic Capacitor (pack of 10) 4. 7uF 25V Electrolytic Capacitor (pack of 10) An aluminum electrolytic capacitor, often only called an electrolytic capacitor, uses aluminum metal as one electrode, covered with a very thin layer of aluminum oxide as dielectric, and which has an the electrolyte as its second electrode. Aluminum electrolytic capacitors are typically used in power supplies and DC DC converters for smoothing and buffering