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Old 17th March 2005, 08:39 AM   #1
mongiak is offline mongiak  Spain
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Default PS filter caps

Im building a class A guitar amp, and I have problems to get the filter caps. Anyways I sont know if I better use polipropilene caps or electrolitic caps, polipropilene ones are suppose to be better, but, Can I chage the polarizated electrolitic caps to a non polarizated polipropilene ones??
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Old 17th March 2005, 01:00 PM   #2
shusha is offline shusha  Croatia
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You can not use non-polarized caps as filters in PSU. As a matter of fact there are no non-polarized caps of greater capacity.
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Old 17th March 2005, 02:45 PM   #3
Leolabs is offline Leolabs  Malaysia
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Even if there is 1,the size must be very very very very very BIG!So,pls still stick to electrolytic for PSU filtering.
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Old 18th March 2005, 12:25 PM   #4
AndrewT is offline AndrewT  Scotland
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Hi,
you can use polypropylene capacitors in your PSU.
I have an old Conrad Johnson preamp that has no electrolytics anywhere. This is supposed to improve the sound quality and considering I have their cheapest model I agree with them.
You can replace only part of the electrolytic to polyfilm eg. 99%electro+1%film to gain some of the benefit.
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Old 19th March 2005, 10:18 PM   #5
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Quote:
Originally posted by shusha
You can not use non-polarized caps as filters in PSU. As a matter of fact there are no non-polarized caps of greater capacity.
Why not?
Just put two large polarized electrolytics together to get a non-polar.


"Can I chage the polarizated electrolitic caps to a non polarizated polipropilene ones"

Yes but simply bypassing with polypropylene is better because you wont lose the large amount of capacitance the electrolytics have.

Be sure to use the recommended amount of capacitance for the expected current draw. You should be able to find surplus caps locally for cheap, just make sure they are not too old.
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