Tweakers' Asylum

any feedback/thoughts of using polystyrene film/foil as bypass caps in a power suppy elcap?

203.193.220.109

jarthel

thank you very much

Follow Ups:

After reading both responses, I have to ask...what's an 'elcap'? (NT) - jeffreybehr 13:38:15 08/03/07 (2)
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- I didn't know what it was either : )...(nt) - Wally 05:12:12 08/04/07 (0)
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- elcaps = electrolytic caps :) (nt) - jarthel 20:00:08 08/03/07 (0)
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did I hear a loud pop or did I just smell something funny - Quest 08:49:04 08/03/07 (3)
These type of film caps aren't meant/designed for use in line AC circuits (with proper UL listings) so why on-earth you want to risk your own safety with this?

*play it safe or don't play at all*
- AC? the styrene are after the diodes. how can it be AC? (nt) - jarthel 15:39:56 08/03/07 (1)
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  - RE: AC? the styrene are after the diodes. how can it be AC? (nt) - unclestu52 19:07:39 08/03/07 (0)
    IIRC styrenes don't handle overvoltages very well. Some rectifiers and the caps following them still have a lot of ripple on them so you may want to play it safe and ,scope the ripple out to be on the safe side, especially if you are cutting the voltages on the close side of the ratings.
    
    Stu
- RE: did I hear a loud pop or did I just smell something funny - Rob F 12:38:48 08/03/07 (0)
  But Quest....
  
  These are not in an AC circuit they are to bypass ps Electrolytics therefore they are used AFTER the rectifier...
  
  So- they are not dangerous so long as their DC voltage rating is sufficient. However speaking personally I have never liked the sound of adding bypass caps. They will, not might, introduce a resonance at very high rf frequencies. You may like that or it may not be audible..
  
  Regards,
  
  Rob.

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