rule of thumb for Cap. value

Discussion in 'General Electronics Chat' started by shortbus, Dec 7, 2009.

  1. shortbus

    Thread Starter AAC Fanatic!

    Sep 30, 2009
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    Is there a 'Rule of Thumb' for filter capacitor values in a power supply? I know I saw one some where but can't seem to find it now.

    Would some one please tell me what it is?

    Thank you, Cary
     
  2. k7elp60

    Distinguished Member

    Nov 4, 2008
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    I generallly use 3000uF per amp of load current.
     
  3. SgtWookie

    Expert

    Jul 17, 2007
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  4. Audioguru

    AAC Fanatic!

    Dec 20, 2007
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    Here is a chart of the ripple amplitude at a 60Hz mains that I use:
     
  5. SgtWookie

    Expert

    Jul 17, 2007
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    That's a very handy chart.

    If you're using a half-wave rectifier, double the values of capacitance shown.

    If for 50Hz power, full-wave rectifier, multiply the values of capacitance shown by 1.2.
    If for 50Hz power, half-wave rectifier, multiply the values of capacitance shown by 2.4.
     
  6. shortbus

    Thread Starter AAC Fanatic!

    Sep 30, 2009
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    Thank you all for the answers!

    AudioGuru, the chart is now in my computer and a copy is in my electronics library. Thank you.

    I've built from kits, but trying to learn how to do my own designs is hard. You guys are great, all the practical knowledge here is a great resource.

    Thank you again, Cary
     
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