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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Re: My super cheap semi-diy PC desktop system:) posted by Frank25 on February 8, 2007 at 17:29:34:
10KuF isn't going to support much of an inductor at these power levels but then again you are presumably really only worried about fairly high freq stuff here so maybe a smaller inductor is in order. 100uH ish? In general the more inductance you add the worse the regulation will get so there is definitely a negative downside to this. However this exact negative effect can be overcome to an extent by bulking up on the amt bypass capacitance. It's a bit of a game to land everything right where you want it. It really is nice to have an oscilloscope to do this kind of development. Do you have access to one?Bypass the amps using normal good bypassing technique, ie short leads on all caps jammed right up against the power pins of the amp as close as is humanly possible and higher SRF (self resonant frequency) like a ceramic or polypropylene cap gets higher priority for the really tight to the power pin positions compared to lower SRF parts like the big aluminum electrolytic which can be farther away. BTW after the amp has been properly bypassed you may find no sonic benefit to adding the L in the pi or tyhe R of the RC. The better you can lay all the parts out in theory the more this is true.
In my opinion filtering is a bandaid and cascading filters would only make the downsides worse. But in the end you may want to cascade a pi with an RC to see how that sounds but again I'm betting that with the right pi or RC there is no need for rc after the pi or visa versa since in essence you are lowering the load/line regulation each filter stage you add.
BUT
You might want to try comparing the sonic benefits of an RC filter to the pi filter individually. The RC may actually end up the more reasonable design for this app!?!?! I've never designed for this exact problem so everything I've said so far is a big guess.
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Follow Ups
- Re: My super cheap semi-diy PC desktop system:) - Ugly 19:51:41 02/08/07 (1)
- Re: My super cheap semi-diy PC desktop system:) - Frank25 07:27:08 02/09/07 (0)
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