In page 423 of Television and Radio Repairing (John Markus), it says "with electrolytics, rated capacitance is obtained only at rated working voltage".
Is that true?
Is that true?
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My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics. -
Re: Electrolytics: rated capacitance obtained only at rated working voltage?
Up to a point yes. That's why it always used to be recommended to run a electrolytic at least at 25% of its rated voltage, otherwise the layer of aluminum oxide breaks down and the capacitance is reduced and/or the capacitor fails.
For the same reason electrolytics have a limited shelf life, leave them sitting around in your cupboard for years and they tend to just give up as soon as you try them.
Exactly how bad 'modern' electrolytics are in that respect its hard to say, as the chemicals used have changed and developed over time, but the problems do still exist.
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