Capacitor voltage rating conversion - diyAudio
 Capacitor voltage rating conversion
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 25th July 2008, 05:10 PM #1 diyAudio Member     Join Date: Jan 2005 Location: Philippines Capacitor voltage rating conversion I have searched on the net and have not found the answer. How do I convert VAC capacitor voltage rating into VDC rating? Thanks.
 25th July 2008, 08:47 PM #2 diyAudio Member     Join Date: Feb 2008 Location: Oregon AC voltage ratings are given as the RMS of a sinusoidal signal, so the peak-to-peak voltage values will be sqrt(2) larger than the RMS. In principle, a capacitor rated at 100 volts AC should then be able to handle 140 volts DC. Note that the amount of time that an AC voltage is near its peak voltage is quite small, so the probability of breakdown for a DC voltage near this rated value may go up significantly. It is always a good idea to leave as much safety margin as practical, and design your circuit so that a single component failure isn't catastrophic.
 26th July 2008, 03:50 AM #3 diyAudio Member     Join Date: Jan 2005 Location: Philippines Thanks. Some people told me DC voltage rating of caps is 1.4X the AC rating, some said it is 2X. Your explanation made a lot of sense. Thanks.
 26th July 2008, 04:24 AM #4 diyAudio Member     Join Date: Dec 2005 Location: the north It is most often, when possible, best to have capacitors well higher rated than you actually will need. This means bigger capacitors. Bigger capacitors = higher nominal voltage, have some better electrical quality performance parameters. This goes for almost every audio use of any capacitor. Another thing is of course if you can get bigger capacitors somewhere. This is not always the case. And then we have how much money you are willing to spend. But generally speaking, capacitors are not the main cost of your amplifier. So put this into the perspective of: - Chassis cost - Transformers cost ... and you will find that you will be able to get real super class capacitors before reaching even a small percent of the other costs in your amplifier. Regards Lineup __________________ lineup

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