Linear Power Supplies..why 2 or 3 smoothing caps ??

Discussion in 'General Electronics Chat' started by ranatungawk, Nov 10, 2015.

  1. ranatungawk

    Thread Starter Active Member

    Oct 30, 2008
    On Linear Power Supplies, i have seen two or three 1000uf capacitors are used parallely (just after the bridge rectifier) as smoothing caps instead of using one 3000uf capacitor. Has it been designed so purposelessly ? or no special reason (are 3 x 1000uf slimier to one 3000uf)?
  2. alfacliff

    Well-Known Member

    Dec 13, 2013
    might have been for size.
  3. MikeML

    AAC Fanatic!

    Oct 2, 2009
    Or the builder had lots of 1000uF capacitors on hand...;)
  4. wayneh


    Sep 9, 2010
    In other words, there's no secret advantage to multiple caps in parallel, versus a single cap. The equivalent series resistance and heat dissipation would be very slightly better for multiple caps, so it's remotely possible the 1,000µF caps were a cheaper or easier solution than choosing a single cap that was properly rated for the job.

    I expected from the title that this question was going to be about using different types and values of caps in parallel, such as a big electrolytic and a 0.1µF ceramic. This is about filtering different frequencies more effectively. Electrolytics are too slow for high frequency filtering.
    ranatungawk likes this.